code 1345

Erstwhile

Newbie
Joined
Apr 1, 2024
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1
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Make
General Motors
Model
Chevrolet
Year
1999
Miles
(?)
Engine
Vortec 5700
Hi, I have a chevy suburban with a code 1345 cam/ck position . Can anyone help with where to start looking?
 

grcauto

wrench
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May 29, 2014
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Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 1999 >> C 2500 Suburban 2WD V8-5.7L VIN R >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1345

P1345​

96609861



96624029



96648107





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. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the table.
4. This test will determine if this DTC is intermittent.
5. When the engine speed is raised to 2000 RPM the camshaft retard offset should not vary more than 2 degrees.
6. If excessive pressure is used when performing this test unintentional damage to the distributor shaft could result.
7. If the distributor is one tooth off in either the advanced or retard positions the vehicle may run but 0 degrees camshaft retard offset will not be obtained.
8. If 0 degrees cannot be obtained during this procedure refer to Diagnostic Aids.

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