DTC Advanced Diagnostics: P15BF
DTC P15BF:CMP Sensor Signal Intermittent Interruption

General Description

The engine mount control system controls the engine mounts electronically. The system consists of the engine mount actuators, the engine mount control unit, and the powertrain control module (PCM). The engine mount control unit uses the crankshaft and camshaft position sensor outputs (received from the PCM) to estimate engine vibration. The engine mount control unit then sends signals to the engine mount actuators to command the engine mounts to push and pull on the engine to counteract engine vibration. The engine mount control unit monitors the TOD OUT signal input to the engine mount control unit, and when an abnormal condition continues for a set time, the engine mount control unit detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
-
DTC Type
One drive cycle, MIL off
OBD Status
N/A

Enable Conditions
Condition
 
State of the engine
Running
No active DTCs set (prevents monitor from running)
P15B0, P15BE, P15C0

Malfunction Threshold
Normally, there are 10 CMP pulses per two revolutions. A malfunction is detected when there are more than 10 CMP pulses or less than 10 CMP pulses at least 512 times.

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 failure
CMP sensor line abnormal
Engine mount control unit internal circuit failure
PCM internal circuit failure

Confirmation Procedure
Operating Condition
Start the engine, and let it idle for at least 20 seconds.

With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.