DTC Advanced Diagnostics: P0340
DTC P0340:Camshaft Position (CMP) Sensor A No Signal

General Description

Camshaft position (CMP) sensor A detects the intake camshaft timing and sends pulsing signals to the powertrain control module (PCM). The PCM determines the advance or the retard of the camshaft timing according to the signals from the crankshaft position (CKP) sensor and CMP sensor A. If no pulsing signals are detected from CMP sensor A, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
–
DTC Type
Two drive cycles, MIL on
OBD Status
PASSED/ FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
 
State of the engine
Running
No active DTCs set (prevents monitor from running)
P0335, P0339, P0344

Malfunction Threshold
No input signals from CMP sensor A are detected at least 25 times in succession.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
CMP sensor A CAM line short to ground
CMP sensor A CAM line open
CMP sensor A failure
PCM internal circuit failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.