SES light came on about a month ago. Went out on its own about a day later. Truck running fine, really good. I did not scan for codes at that time. Anyway I went out of town this weekend and while I was away it came on again and went out on its own later that day. When I returned home I did scan this time and P1345 was in the memory. The truck runs really good no problems and the SES light is out. I understand the fault code (Camshaft to crankshaft correlation) (timing) but, should I be concerned if it goes off on its own? Truck has 142k miles on it and runs really good. It starts fine, gas mileage, drivability all seem fine. Any thoughts?
Engine Fault code
- Thread starter bass1775
- Start date
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SunlitComet
OBS Jedi-Do Good
If you have a compatible scanner that can read cam retard you might want to fine tune it a little bit after reading below for other causes. If you need instructions on how write back.
Circuit Description
This DTC monitors the CKP and CMP signals to determine if they are synchronized. If both signals are not observed by the Control Module (PCM/VCM) within a narrow time window, the VCM will determine that an error has occurred.
Conditions for Running the DTC
The engine is running
Conditions for Setting the DTC
When the engine is running, the cam sensor reference pulse is not detected at the correct position relative to the crankshaft position sensor pulse.
Action Taken When the DTC Sets
* The Control Module illuminates the Malfunction Indicator Lamp (MIL) the first time the diagnostic runs and fails.
* The Control Module will set the DTC and records the operating conditions at the time the diagnostic fails. The Control Module stores the failure information in the scan tools Freeze Frame and/or the Failure Records.
Conditions for Clearing the MIL/DTC
* The Control Module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
* A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
* Use the scan tool Clear Information function.
Diagnostic Aids
Check the following items:
* A loose CMP sensor causing a variance in the sensor signal
* Excessive free play in the timing chain and gear assembly
* Incorrectly installed distributor - 1 tooth off in either advance or retard positions
* A loose distributor rotor on the distributor shaft
* A loose or missing distributor hold down bolt.
An intermittent may be caused by any of the following conditions:
* A poor connection
* Rubbed through wire insulation
* A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis. See: Symptom Related Diagnostic Procedures
Circuit Description
This DTC monitors the CKP and CMP signals to determine if they are synchronized. If both signals are not observed by the Control Module (PCM/VCM) within a narrow time window, the VCM will determine that an error has occurred.
Conditions for Running the DTC
The engine is running
Conditions for Setting the DTC
When the engine is running, the cam sensor reference pulse is not detected at the correct position relative to the crankshaft position sensor pulse.
Action Taken When the DTC Sets
* The Control Module illuminates the Malfunction Indicator Lamp (MIL) the first time the diagnostic runs and fails.
* The Control Module will set the DTC and records the operating conditions at the time the diagnostic fails. The Control Module stores the failure information in the scan tools Freeze Frame and/or the Failure Records.
Conditions for Clearing the MIL/DTC
* The Control Module turns OFF the MIL after 3 consecutive drive trips when the test has Run and Passed.
* A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the start-up coolant temperature and the Engine Coolant Temperature is more than 70°C (158°F) during the same ignition cycle).
* Use the scan tool Clear Information function.
Diagnostic Aids
Check the following items:
* A loose CMP sensor causing a variance in the sensor signal
* Excessive free play in the timing chain and gear assembly
* Incorrectly installed distributor - 1 tooth off in either advance or retard positions
* A loose distributor rotor on the distributor shaft
* A loose or missing distributor hold down bolt.
An intermittent may be caused by any of the following conditions:
* A poor connection
* Rubbed through wire insulation
* A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis. See: Symptom Related Diagnostic Procedures
