DTC P0340: Notes

DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0340)

DTC P0340	CMP sensor circuit problem
DETECTION CONDITION	The PCM monitors the input voltage from the CMP sensor when the engine is running. If the PCM does not receive the input voltage from the CMP sensor while the PCM receives the input signal from the CKP sensor, the PCM determines that the CMP sensor circuit has a malfunction. If a malfunction is detected in the input pulse pattern from the CMP sensor. Diagnostic support note This is a continuous monitor (CCM). The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle. PENDING CODE is available if the PCM detects the above malfunction condition. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	CMP sensor malfunction Connector or terminal malfunction CMP sensor is dirty Short to power supply in wiring harness between CMP sensor terminal B and PCM terminal 2S Short to power supply in wiring harness between CMP sensor terminal A and PCM terminal 2P Short to ground circuit in wiring harness between CMP sensor terminal C and PCM terminal 2AM Short to ground circuit in wiring harness between CMP sensor terminal B and PCM terminal 2S Open circuit in wiring harness between CMP sensor terminal A and PCM terminal 2P Open circuit in wiring harness between CMP sensor terminal B and PCM terminal 2S Open circuit in wiring harness between CMP sensor terminal C and PCM terminal 2AM Both CMP sensor wires are shorted to each other CMP sensor pulse wheel malfunction CMP sensor misinstallation Timing chain misinstallation Loose timing chain or improper valve timing Loose camshaft sprocket lock bolt Loose crankshaft pulley lock bolt. PCM malfunction
Courtesy of MAZDA MOTORS CORP.

DTC P0340

CMP sensor circuit problem

DETECTION CONDITION

The PCM monitors the input voltage from the CMP sensor when the engine is running. If the PCM does not receive the input voltage from the CMP sensor while the PCM receives the input signal from the CKP sensor, the PCM determines that the CMP sensor circuit has a malfunction.
If a malfunction is detected in the input pulse pattern from the CMP sensor.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
PENDING CODE is available if the PCM detects the above malfunction condition.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

CMP sensor malfunction
Connector or terminal malfunction
CMP sensor is dirty
Short to power supply in wiring harness between CMP sensor terminal B and PCM terminal 2S
Short to power supply in wiring harness between CMP sensor terminal A and PCM terminal 2P
Short to ground circuit in wiring harness between CMP sensor terminal C and PCM terminal 2AM
Short to ground circuit in wiring harness between CMP sensor terminal B and PCM terminal 2S
Open circuit in wiring harness between CMP sensor terminal A and PCM terminal 2P
Open circuit in wiring harness between CMP sensor terminal B and PCM terminal 2S
Open circuit in wiring harness between CMP sensor terminal C and PCM terminal 2AM
Both CMP sensor wires are shorted to each other
CMP sensor pulse wheel malfunction
CMP sensor misinstallation
Timing chain misinstallation
Loose timing chain or improper valve timing
Loose camshaft sprocket lock bolt
Loose crankshaft pulley lock bolt.
PCM malfunction

Courtesy of MAZDA MOTORS CORP.