Fault code 4420: Diagnosis/troubleshooting: Overview

NOTE: If the rate-of-turn sensor with part No. 996.606.147.00 is determined to be faulty, install the new rate-of-turn sensor with part No. 996.606.145.00. The front centre console holder and the lower front centre console support must be replaced for this purpose. An adapter plug must be used for the plug connection. Refer to CONVERSION OF RATE-OF-TURN SENSOR .

The following troubleshooting procedure applies to the rate-of-turn sensor 996.606.147.00 up to 07/00.

Rate-of-turn sensor 996.606.147.00

Fig 1: Identifying Rate-Of-Turn Sensor - Part No. 996.606.147.00 Up To 07/00

Courtesy of PORSCHE OF NORTH AMERICA, INC.

DIAGNOSIS/TROUBLESHOOTING CHART - FAULT CODE 4420 (PART NO. 996.606.147.00 UP TO 07/00)

Work instruction			Display OK	If not OK
1	Check power supply of the rate-of-turn sensor	Switch off ignition Pull plug off the rate-of-turn sensor Switch on ignition Measure voltage between pin 1 of rate-of-turn sensor plug and ground	> 11 V Step 2	Open circuit in circuit between PSM control module plug pin 39 and pin 1 of the rate-of-turn sensor plug, or PSM contol module faulty -> End
2	Check ground of the rate-of-turn sensor	Measure voltage between pin 1 of the rate-of-turn sensor plug and pin 2 of the rate-of-turn sensor plug	> 11 V Step 3	Open circuit in circuit between PSM control module plug pin 21 and pin 2 of the rate-of-turn sensor plug, or PSM contol module faulty -> End
3	Check reference voltage of the rate-of-turn sensor	Measure voltage between pin 5 of the rate-of-turn sensor plug and pin 2 of the rate-of-turn sensor plug	approx. 2.5 V Step 4	Open circuit in circuit between PSM control module plug pin 10 and pin 5 of the rate-of-turn sensor plug, or PSM contol module faulty -> End
4	Check leads from PSM control module to rate-of-turn sensor for short circuit to voltage	Switch off ignition Pull off the PSM control module plug Switch on ignition Measure voltage between pins 3, 5 and 6 of the rate-of-turn sensor plug and ground	a< 0.3 V Step 5	Short circuit to voltage between pins 3, 5 and 6 of the rate-of-turn sensor plug and pins 10, 9 and 41 of the PSM control module plug -> End
5	Check leads from PSM control module to rate-of-turn sensor for short circuit to ground	Switch off ignition Measure resistance between pins 3, 5 and 6 of the rate-of-turn sensor plug and ground	< 5 Step 6	Short circuit to ground between pins 3, 5 and 6 of the rate-of-turn sensor plug and pins 9, 10 and 41 of the PSM control module plug -> End
6	Check leads from PSM control module to rate-of-turn sensor for open circuit	Measure resistance between pins 3, 5 and 6 of the rate-of-turn sensor plug and pins 9, 10 and 41 of the PSM control module plug	< 5 Step 7	Open circuit between pins 3, 5 and 6 of the rate-of-turn sensor plug and pins 9, 10 and 41 of the PSM control module plug -> End
7	Check leads from PSM control module to rate-of-turn sensor for short circuit	Measure resistance between pin 5 of the rate-of-turn sensor plug and pins 3 and 6 of the rate-of-turn sensor plug Measure resistance between pin 3 of the rate-of-turn sensor plug and pin 6 of the rate-of-turn sensor plug	Step 8	Short circuit in wiring harness between pins 3, 5 and 6 of the rate-of-turn sensor plug and pins 9, 10 and 41 of the PSM control module plug -> End
8	Rate-of-turn sensor faulty		-> End