Fault code 4400: Diagnosis/troubleshooting: Overview

NOTE: The transverse acceleration sensor and the rate-of-turn sensor are combined in one housing. If a fault is detected in the transverse acceleration sensor, the rate-of-turn sensor must be replaced.

The following troubleshooting procedure applies to the transverse acceleration sensor (rate-of-turn sensor) 996.606.145.00 as of 08/00

Transverse acceleration sensor (rate-of-turn sensor) 996.606.145.00 As Of 08/00

Fig 1: Identifying Transverse Acceleration Sensor (Rate-Of-Turn Sensor) - Part No. 996.606.145.00 As Of 08/00

Courtesy of PORSCHE OF NORTH AMERICA, INC.

WORK INSTRUCTION CHART - FAULT CODE 4400 (PART NO. 996.606.145.00 AS OF 08/00)

Work instruction			Display OK	If not OK
1	Check lead from PSM control module to transverse acceleration sensor for short circuit to ground/open circuit	Switch off ignition Pull plug off transverse acceleration sensor (rate-of-turn sensor) Switch on ignition Measure voltage between pin 3 of transverse acceleration sensor (rate-of-turn sensor) plug and ground	> 11 V Step 2	Short circuit to ground/open circuit in circuit between PSM control module plug pin 39 and pin 3 of transverse acceleration sensor (rate-of-turn sensor) plug or PSM control module is faulty -> End
2	Check ground lead of the transverse acceleration sensor for open circuit	Measure voltage between pin 3 of the transverse acceleration sensor (rate-of-turn sensor) plug and pin 6 of the transverse acceleration sensor (rate-of-turn sensor) plug	> 11 V Step 3	Open circuit in circuit between PSM control module plug pin 21 and pin 6 of the transverse acceleration sensor (rate-of-turn sensor) plug, or PSM contol module faulty -> End
3	Check signal lead of the transverse acceleration sensor for short circuit to voltage	Switch off ignition Pull off the PSM control module plug Switch on ignition Measure voltage between PSM control module plug pin 8 and ground	< 0.3 V Step 4	Short circuit to voltage between PSM control module plug pin 8 and pin 5 of the transverse acceleration sensor (rate-of-turn sensor) plug -> End
4	Check signal lead of the transverse acceleration sensor for short circuit to ground	Switch off ignition Measure resistance between PSM control module plug pin 8 and ground	Step 5	Short circuit to ground between PSM control module plug pin 8 and pin 5 of the transverse acceleration sensor (rate-of-turn sensor) plug -> End
5	Check signal lead of the transverse acceleration sensor for open circuit	Measure resistance between PSM control module plug pin 8 and pin 5 of the transverse acceleration sensor (rate-of-turn sensor) plug	< 5 Step 6	Open circuit between PSM control module plug pin 8 and pin 5 of the transverse acceleration sensor (rate-of-turn sensor) plug -> End
6	Transverse acceleration sensor (rate-of-return sensor) faulty		-> End