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DTC P0340: No Cam Signal At Pcm: Testing

  1. Turn ignition on. Using scan tool, select INPUTS/OUTPUTS and read current CMP state while cranking engine. If scan tool displays current CMP state PRESENT, go to next step. If scan tool does not display current CMP state PRESENT, go to step  6 .
  2. Turn ignition off. Using lab scope, backprobe CKP sensor signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. See Figure and Figure . While observing lab scope screen, turn ignition on. If CKP sensor generated any pulses, replace CKP sensor. If CKP sensor did not generate any pulses, go to next step.
  3. Turn ignition off. Using lab scope, backprobe CMP sensor signal circuit (Tan/Yellow wire) at PCM C1 connector terminal No. 33. While observing lab scope screen, turn ignition on. If CMP sensor generated any pulses, replace CMP sensor. If CMP sensor did not generate any pulses, go to next step.
  4. Turn ignition off. Using lab scope, backprobe CKP signal circuit (Gray/Black wire) at PCM C1 connector terminal No. 32. Start engine. Observe lab scope screen while wiggling wiring harness and connectors between CKP sensor and PCM. If any irregularities in lab scope pattern are present, carefully inspect related wiring harness connectors. Repair connectors as necessary. If connectors are okay, replace CKP sensor. If no irregularities in lab scope pattern are present, go to next step.
  5. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

  6. Turn ignition off. Disconnect CMP sensor harness connector. See Figure or Figure . Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If voltage is 7.5-8.5 volts, go to next step. If voltage is not 7.5-8.5 volts, go to step  15 .
  7. Measure voltage between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If voltage is 4.5-5.0 volts, go to next step. If voltage is not 4.5-5.0 volts, go to step  10 .
  8. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance of sensor ground circuit (Black/Light Blue wire) between CMP sensor harness connector and terminal No. 43 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
  9. If no other possible causes are remaining, CMP sensor is assumed to be defective. Replace CMP sensor.
  10. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in Tan/Yellow wire.
  11. Measure resistance of signal circuit (Tan/Yellow wire) between CMP sensor harness connector and terminal No. 33 at PCM C1 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Tan/Yellow wire.
  12. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and signal circuit (Tan/Yellow wire) at CMP sensor harness connector. If voltage is 5 volts or less, go to next step. If voltage is more than 5 volts, repair short to voltage in Tan/Yellow wire.
  13. Turn ignition off. Disconnect PCM harness connectors. Measure resistance between signal circuit (Tan/Yellow wire) and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short between signal circuit and 5-volt to 8-volt supply circuit.
  14. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
  15. Turn ignition off. Disconnect PCM harness connectors. See Figure . Measure resistance between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If resistance is 100 ohms or more, go to next step. If resistance is less than 100 ohms, repair short to ground in 5-volt to 8-volt supply circuit. See WIRING DIAGRAMS article.
  16. Measure resistance of 5-volt to 8-volt supply circuit (Orange wire) between CMP sensor harness connector and terminal No. 44 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Orange wire.
  17. Reconnect PCM harness connectors. Turn ignition on. Measure voltage between ground and 5-volt to 8-volt supply circuit (Orange wire) at CMP sensor harness connector. If voltage is 8.5 volts or less, go to next step. If voltage is more than 8.5 volts, repair short to voltage in 5-volt to 8-volt supply circuit. See WIRING DIAGRAMS article.
  18. If no other possible causes are remaining, PCM is assumed to be defective. Replace PCM.
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