PSM
Fault code 1279Axial acceleration sensor
Diagnostic conditions
- Ignition on
- Internal PSM control module function test
Possible cause of fault
- The axial acceleration sensor was not calibrated or was not calibrated correctly (no or incorrect basic setting/adaptation)
Actual value of function integrated in the combination sensor:
- Axial acceleration sensor
is evaluated and displays an implausible value (implausible signal).
- Internal CAN: Wire faulty (no signal/communication)
- Short circuit to ground (electrical fault in electric circuit)
- Short circuit to B+ (electrical fault in electric circuit)
- Open circuit in circuit to control module (no signal/communication)
- Axial acceleration sensor faulty
NOTE: The transverse and axial acceleration sensor and the rate-of-turn sensor are integrated into the combination sensor housing. If a fault is detected in one of these three sensors, the combination sensor must be replaced. The integrated transverse and axial acceleration sensor must be calibrated after replacement.
Affected pins
PSM control module plug:
- Pin 6 'voltage'
- Pin 24 'ground'
- Pin 25 'internal CAN (low)'
- Pin 29 'internal CAN (high)'
Diagnosis/troubleshooting PSM 0101
NOTE:
- Calibration completed, or checked and found to be OK.
- During calibration, the flashing frequency of the ABS warning light increases to 1.9 Hz The brake warning light flashes with a lower frequency (1.1 Hz).
- Visual inspection: In the next troubleshooting section, please check first that the affected pins on the PSM control module plug connection and the pins on the combination sensor plug connection are neither damaged nor corroded. The wiring of the affected components must also be checked for external damage repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wire.
