Symptom Troubleshooting Chart - Automatic Transmission External Controls: Notes

SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION EXTERNAL CONTROLS

Condition	Possible Cause	Action
Shift Interlock System Does Not Release/Lock Properly.	Circuit(s). Fuse(s). Shift lock actuator. Brake pedal position (BPP) switch.	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 1: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK PROPERLY .
Shift Control Is Out of Proper Gear Relationship.	Transmission shift cable and bracket. Retainer bracket. Shift control linkage.	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 2: SHIFT CONTROL IS OUT OF PROPER GEAR RELATIONSHIP .
Transmission Range Indicator Does Not Correspond to the Gear.	Transmission shift cable bracket.	Tighten bolts holding transmission shift cable bracket. See SHIFT CABLE AND BRACKET ADJUSTMENT .
	Transmission control indicator linkage.	Adjust PRNDL at the steering housing. See SHIFT INDICATOR CABLE AND BRACKET ADJUSTMENT .
	Transmission shift cable loose from the transmission retainer bracket.	Reinstall transmission shift cable into bracket. Replace if damaged. See SHIFT CABLE AND BRACKET REMOVAL/INSTALLATION .
	Shift linkage.	Verify the transmission shift cable adjustment. Adjust the transmission shift cable if necessary. See SHIFT CABLE AND BRACKET ADJUSTMENT . Verify digital transmission range (DTR) sensor for proper adjustment. See DIGITAL TRANSMISSION RANGE SENSOR REMOVAL/INSTALLATION .
	Clip securing the transmission shift cable to the shift control selector lever.	Install the clip properly.
Transmission Range Indicator Lamp Does Not Illuminate.	Bulb. Circuit(s).	See SYMPTOM TROUBLESHOOTING CHART - INSTRUMENT CLUSTER AND PANEL LIGHTING .
Transmission Control (OD ON/OFF) Switch (TCS) Inoperative.	Blown fuse. Damaged TCS or TCS not cycled during self test. Damaged powertrain control module. Circuitry open/shorted.	See TRANSMISSION CONTROL SWITCH (TCS) REMOVAL/INSTALLATION . See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 3: THE TRANSMISSION CONTROL SWITCH (OVER-DRIVE OD, ON/OFF) IS NOT OPERATING PROPERLY .
Transmission Control (OD ON/OFF) Indicator Lamp (TCIL) Does Not Illuminate.	Burned out bulb. Circuitry open/shorted. Damaged powertrain control module.	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 4: TRANSMISSION CONTROL INDICATOR LAMP (TCIL) (OVER-DRIVE OD, ON/OFF) DOES NOT ILLUMINATE .
Transmission Control (OD ON/OFF) Indicator Lamp (TCIL) Stays Illuminated.	Circuitry open/shorted. Damaged powertrain control module.	See AUTOMATIC TRANSMISSION EXTERNAL CONTROLS PINPOINT TEST 5: TRANSMISSION CONTROL INDICATOR LAMP (TCIL) STAYS ILLUMINATED .