Possible Causes
NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.
- Faulty intake camshaft position sensor
- Faulty camshaft position solenoid valve
- Engine mechanical condition
- Valve timing off
- Intake camshaft position sensor harness is open or shorted
- Poor electrical connection in the intake camshaft position sensor circuit
Description
The camshaft position (CMP) sensor input is used to detect engine misfire. The powertrain control module (PCM) also uses the CMP sensor signal as an input to modify fuel injection timing and to adjust ignition timing.
The PCM receives information about engine status from various engine sensors, then selects the most appropriate ignition timing settings from the PCM programming. Here are the most important pieces of information for determining ignition timing requirements:
– Engine speed
– Throttle position (TP)
– Intake air volume
– Engine coolant temperature (ECT)
– Knock sensor (KS) input
How to Repair
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Detected
The powertrain control module (PCM) detected that the actual cam timing and target cam timing did not match
Possible Symptoms
- Engine light on (or service engine soon warning light)
- Engine hard to start