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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING INDEX CHART

Symptom Probable cause(s) Notes
When you turn the ignition switch to ON (II), the D indicator comes on and stays on in all shift lever positions, or it never comes on at all
  1. F-CAN communication line defective
  2. Gauge control module defective
  3. PCM defective
D3 or M indicator does not work
  1. F-CAN communication line defective
  2. Gauge control module defective
  3. PCM defective
  4. Transmission range switch defective
Shift lever cannot be moved from P while you are pressing on the brake pedal
  1. A problem in the shift lock system (interlock system)
  2. Accelerator pedal position sensor circuit
Shift lever cannot pass through R from N A problem in the reverse lock system of interlock system Check the interlock system - reverse lock system circuit (see REVERSE LOCK SYSTEM CIRCUIT TROUBLESHOOTING  ).
Ignition switch cannot be moved from ACCESSORY (1) to LOCK (0) (key is pushed in, the shift lever in P) A problem in the key interlock system (interlock system) Check the interlock system - key interlock system circuit (see KEY INTERLOCK SYSTEM CIRCUIT TROUBLESHOOTING  ).
Engine runs, but vehicle does not move in any gear
  1. Low ATF level
  2. Shift cable broken or out of adjustment
  3. Connection between the shift cable and transmission or body is worn
  4. ATF pump worn or binding
  5. Regulator valve stuck or spring worn
  6. ATF strainer clogged
  7. Mainshaft worn or damaged
  8. Final gears worn or damaged
  9. Transmission-to-engine assembly error
  10. Axle disengaged
  • Check the ATF level, and check the ATF cooler lines for leakage and loose connections. If necessary, clean the ATF cooler lines.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
  • Check the line pressure.
  • Be careful not to damage the torque converter housing when replacing the main ball bearing. You may also damage the ATF pump when you torque down the main valve body. This will result in ATF pump seizure if not detected. Use the proper tools.
  • Install the main seal flush with the torque converter housing. If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage.
  • Check the ATF strainer for debris. If the ATF strainer is clogged with particles of steel or aluminum, inspect the ATF pump. If the ATF pump is OK, find the damaged components that caused the debris. If no cause for contamination is found, replace the torque converter.
  • Inspect the differential pinion shaft for wear. If the differential pinion shaft is worn, replace the differential assembly, replace the ATF strainer, thoroughly clean the transmission, and clean the torque converter, cooler, and lines.
Vehicle moves in R, but not in D, D3, or M in 1st
  1. 1st accumulator defective
  2. 1st gears worn or damaged
  3. 1st clutch defective
  • Check the 1st clutch pressure.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 1st clutch feed pipe. If the 1st clutch feed pipe is scored, replace the end cover.
  • Replace the secondary shaft if the bushing for the 1st clutch feed pipe is loose or damaged.
Vehicle moves in D, D3, and R, but not in 2nd in M
  1. 2nd accumulator defective
  2. 2nd gears worn or damaged
  3. 2nd clutch defective
  • Check the 2nd clutch pressure.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
Vehicle moves in D, D3, and M, but not in R
  1. Shift solenoid valve E defective
  2. Shift fork shaft stuck
  3. Shift valve E defective
  4. 4th/reverse accumulator defective
  5. 4th clutch defective
  6. Reverse gears worn or damaged
  • Check for a stored DTC, and check for loose connectors.
  • Inspect shift solenoid valve E for seizure and the O-rings for wear and damage.
  • Check for a missing shift fork bolt on the shift fork shaft.
  • Check the 4th clutch pressure.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the reverse selector gear teeth chamfers, and inspect engagement teeth chamfers of the countershaft 4th gear and reverse gear. Replace the reverse gears and the reverse selector if they are worn or damaged. If the transmission makes a clicking, grinding, or whirring noise, also replace the mainshaft 4th gear, the reverse idler gear, and the countershaft 4th gear.
Poor acceleration; flares when starting off in D, D3, R, and M; stall speed high in D, D3, and M in 1st and 2nd
  1. Low ATF level
  2. Shift cable broken or out of adjustment
  3. ATF pump worn or binding
  4. Regulator valve stuck or spring worn
  5. ATF strainer clogged
  6. Torque converter check valve defective
  • Check the ATF level, and check the ATF cooler lines for leakage and loose connections. If necessary, clean the ATF cooler lines.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
  • Check the ATF strainer for debris. If the ATF strainer is clogged with particles of steel or aluminum, inspect the ATF pump. If the ATF pump is OK, find the damaged components that caused the debris, and if no cause for contamination is found, replace the torque converter.
Poor acceleration; flares when starting off in D, D3, R, and M; stall speed high when starting off in M in 2nd 2nd clutch defective
  • Check the 2nd clutch pressure.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
Poor acceleration; flares when starting off in D, D3, R, and M; stall speed high in R
  1. Shift cable broken or out of adjustment
  2. 4th clutch defective
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Check the 4th clutch pressure in the D and R positions.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
Poor acceleration; flares when starting off in D, D3, R, and M; stall speed low in D, D3, and M in 1st and 2nd
  1. Shift solenoid valve E defective
  2. Torque converter one-way clutch defective
  3. Engine output low
  4. Torque converter clutch piston defective
  5. Lock-up shift valve defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect shift solenoid valve E for seizure and the O-ring for wear and damage.
  • Replace the torque converter.
Poor acceleration; flares when starting off in D, D3, R, and M; stall speed low in R
  1. Torque converter one-way clutch defective
  2. Engine output low
  3. Torque converter clutch piston defective
  4. Lock-upshift valve defective
 Replace the torque converter.
Engine idle vibration
  1. Misadjusted engine and transmission mounts
  2. Low ATF level
  3. Shift solenoid valve E defective
  4. Drive plate defective or transmission misassembled
  5. Engine output low
  6. Torque converter clutch piston defective
  7. ATF pump worn or binding
  8. Lock-up shift valve defective
  • Check the ATF level, and check the ATF cooler lines for leakage and loose connections. If necessary, clean the ATF cooler lines.
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
  • Inspect the ATF strainer for clogging with particles of steel or aluminum. If the ATF strainer is clogged, replace it, and clean the torque converter, cooler, and lines.
  • Check for a stored DTC, and check for loose connectors.
  • Inspect shift solenoid valve E for seizure and the O-rings for wear and damage.
  • Check for a misinstalled/damaged drive plate.
  • Adjust the engine and transmission mounts.
  • Replace the torque converter.
Vehicle moves in N
  1. Excessive ATF
  2. Foreign material in separator plate orifice
  3. Relief valve defective
  4. 1st clutch defective
  5. 2nd clutch defective
  6. 3rd clutch defective
  7. 4th clutch defective
  8. 5th clutch defective
  9. Clearance between clutch end-plate and top disc incorrect
  10. Needle bearing seized, worn, or damaged
  11. Thrust washer seized, worn, or damaged
  • Check the ATF level, and drain the ATF if it is over-filled.
  • Check if the ATF strainer is clogged. If the ATF strainer is clogged with particles of steel or aluminum, inspect the ATF pump. If the ATF pump is OK, find the damaged components that caused the debris, and if no cause for contamination is found, replace the torque converter.
  • Check the 1st, 2nd, 3rd, 4th, and 5th clutch pressures.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 1st clutch feed pipe. If the 1st clutch feed pipe is scored, replace the end cover.
  • Inspect the 3rd clutch feed pipe. If the 3rd clutch feed pipe is scored, replace it and the O-ring under the feed pipe guide.
  • Replace the secondary shaft if the bushing for the 1st or 3rd clutch feed pipe is loose or damaged.
  • Inspect the 5th clutch feed pipe. If the 5th clutch feed pipe is scored, replace it and the O-ring under the feed pipe guide.
  • Replace the mainshaft if the bushing for the 5th clutch feed pipe is loose or damaged.
Late shift after shifting from N to D and D3, or excessive shock when shifted into D and D3
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. A/T clutch pressure control solenoid valve B defective
  4. A/T clutch pressure control solenoid valve C defective
  5. Shift cable broken or out of adjustment
  6. Connection between the shift cable and transmission or body is worn
  7. Input shaft (mainshaft) speed sensor defective
  8. Output shaft (countershaft) speed sensor defective
  9. ATF temperature sensor defective
  10. Foreign material in separator plate orifice
  11. Servo control valve defective
  12. 1st accumulator defective
  13. 1st check ball stuck
  14. Lock-up shift valve defective
  15. 1st clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Check the 1st clutch pressure.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 1st clutch feed pipe. If the 1st clutch feed pipe is scored, replace the end cover.
Late shift after shifting from N to R, or excessive shock when shifted into R
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Shift cable broken or out of adjustment
  4. Connection between the shift cable and transmission or body is worn
  5. Input shaft (mainshaft) speed sensor defective
  6. Output shaft (countershaft) speed sensor defective
  7. ATF temperature sensor defective
  8. Shift fork shaft stuck
  9. Foreign material in separator plate orifice
  10. Shift valve E defective
  11. 4th/reverse accumulator defective
  12. Lock-up shift valve defective
  13. 4th clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Check for a missing shift fork bolt on the shift fork shaft.
  • Check the 4th clutch pressure.
  • Inspect the servo valve and the O-ring.
Transmission does not shift
  1. Input shaft (mainshaft) speed sensor defective
  2. Output shaft (countershaft) speed sensor defective
  • Check for a stored DTC, and check for loose connectors.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
Excessive shock or flares on all upshifts and downshifts
  1. A/T clutch pressure control solenoid valve B defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Input shaft (mainshaft) speed sensor defective
  4. Output shaft (countershaft) speed sensor defective
  5. ATF temperature sensor defective
  6. Foreign material in separator plate orifice
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
Excessive shock or flares on 1-2 upshift or 2-1 downshift
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. A/T clutch pressure control solenoid valve B defective
  4. A/T clutch pressure control solenoid valve C defective
  5. 2nd clutch transmission fluid pressure switch defective
  6. Foreign material in separator plate orifice
  7. 1st accumulator defective
  8. 2nd accumulator defective
  9. 1st check ball stuck
  10. 2nd check bail stuck
  11. Lock-up shift valve defective
  12. 1st clutch defective
  13. 2nd clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the 1st and 2nd clutch pressures.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 1st clutch feed pipe. If the 1st clutch feed pipe is scored, replace the end cover.
  • Replace the secondary shaft if the bushing for the 3rd clutch feed pipe is loose or damaged.
Excessive shock or flares on 2-3 upshift or 3-2 downshift
  1. A/T clutch pressure control solenoid valve B defective
  2. A/T clutch pressure control solenoid valve C defective
  3. 3rd clutch transmission fluid pressure switch defective
  4. Foreign material in separator plate orifice
  5. 2nd accumulator defective
  6. 3rd accumulator defective
  7. 2nd check ball stuck
  8. 2nd clutch defective
  9. 3rd clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the 2nd and 3rd clutch pressures.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 3rd clutch feed pipe. If the 3rd clutch feed pipe is scored, replace it and the O-ring under the feed pipe guide.
  • Replace the secondary shaft if the bushing for the 3rd clutch feed pipe is loose or damaged.
Excessive shock or flares on 3-4 upshift or 4-3 downshift
  1. A/T clutch pressure control solenoid valve B defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Foreign material in separator plate orifice
  4. 3rd accumulator defective
  5. 4th accumulator defective
  6. 3rd clutch defective
  7. 4th clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the 3rd and 4th clutch pressures.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 3rd clutch feed pipe. If the 3rd clutch feed pipe is scored, replace it and the O-ring under the feed pipe guide.
  • Replace the secondary shaft if the bushing for the 3rd clutch feed pipe is loose or damaged.
Excessive shock or flares on 4-5 upshift or 5-4 downshift
  1. A/T clutch pressure control solenoid valve B defective
  2. A/T clutch pressure control solenoid valve C defective
  3. Foreign material in separator plate orifice
  4. 4th accumulator defective
  5. 5th accumulator defective
  6. 4th clutch defective
  7. 5th clutch defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Check the 4th and 5th clutch pressures.
  • Inspect the clutch piston, the clutch piston check valve, and the O-rings. Check the spring retainer and the retainer seal for wear and damage. Inspect the clearance between the clutch end-plate and the top disc. If the clearance is out of tolerance, inspect the clutch discs and plates for wear and damage. If the discs are worn or damaged, replace the discs as a set. Inspect the clutch wave-plate height. If the height is out of tolerance, replace the wave-plate. If the discs and plates are OK, adjust the clearance with the clutch end-plate.
  • Inspect the 5th clutch feed pipe. If the 5th clutch feed pipe is scored, replace it and the O-ring under the feed pipe guide.
  • Replace the mainshaft if the bushing for the 5th clutch feed pipe is loose or damaged.
Noise from transmission in all shift lever positions
  1. ATF pump worn or binding
  2. Mainshaft bearing, countershaft bearing or secondary shaft bearing defective
  • Improper alignment of the ATF pump and the torque converter housing may cause ATF pump seizure. The symptoms are mostly an rpm-related ticking noise or a high pitched squeak.
  • Be careful not to damage the torque converter housing when replacing the main ball bearing. You may also damage the ATF pump when you torque down the main valve body. This will result in an ATF pump seizure if not detected. Use the proper tools.
  • Install the main seal flush with the torque converter housing. If you push it into the torque converter housing until it bottoms out, it will block the fluid return passage and result in damage.
  • Check if the ATF strainer is clogged with particles of steel or aluminum. If clogged, replace it, and clean the torque converter, cooler, and lines.
  • Inspect the mainshaft and the countershaft for wear or damage.
Vehicle does not accelerate above 31 mph (50 km/h) Torque converter one-way clutch defective Replace the torque converter.
Vibration in all shift lever positions Drive plate defective or transmission misassembled
  • Check for a misinstalled/damaged drive plate.
  • Adjust the engine and the transmission mounts.
Shift lever does not operate smoothly
  1. Transmission range switch defective or out of adjustment
  2. Shift cable broken or out of adjustment
  3. Connection between the shift cable and transmission or body is worn
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the transmission range switch for operation.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
Transmission does not shift into P
  1. Shift cable broken or out of adjustment
  2. Connection between the shift cable and transmission or body is worn
  3. Park mechanism defective
  • Check for a loose shift cable at the shift lever and the transmission control lever.
  • Check the park pawl spring installation and the park lever spring installation. If installation is incorrect, install the spring correctly. Make sure that the park lever stop is not installed upside down. Check the distance between the park pawl shaft and the park lever roller pin. If the distance is out of tolerance, adjust the distance with the park lever stop.
Torque converter clutch does not disengage
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Torque converter clutch piston defective
  4. Lock-up shift valve defective
  5. Lock-up control valve defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Replace the torque converter.
Torque converter clutch does not operate smoothly
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Torque converter clutch piston defective
  4. Torque converter check valve defective
  5. Lock-up shift valve defective
  6. Lock-up control valve defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Replace the torque converter.
Torque converter clutch does not engage
  1. Shift solenoid valve E defective
  2. A/T clutch pressure control solenoid valve A defective
  3. Input shaft (mainshaft) speed sensor defective
  4. Output shaft (countershaft) speed sensor defective
  5. Torque converter clutch piston defective
  6. Torque converter check valve defective
  7. Lock-up shift valve defective
  8. Lock-up control valve defective
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the solenoid valve filter/gasket and the O-rings for wear and damage, and inspect the solenoid valves for seizure.
  • Replace the torque converter.
  • Check the input shaft (mainshaft) speed sensor and the output shaft (countershaft) speed sensor installation.
A/T gear position indicator does not indicate shift lever positions
  1. Transmission range switch defective or out of adjustment
  2. Shift cable broken or out of adjustment
  3. Connection between the shift cable and transmission or body is worn
  • Check for a stored DTC, and check for loose connectors.
  • Inspect the transmission range switch operation.
  • Check for a loose shift cable at the shift lever and the transmission control lever.
Speedometer and odometer do not work Output shaft (countershaft) speed sensor defective
  • Check for a stored DTC, and check for loose connectors.
  • Check the output shaft (countershaft) speed sensor installation.
Engine does not rev to high rpm, and the transmission upshifts at low rpm (engine at normal operating temperature) VTEC rocker arms defective Check the engine rocker arms.
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