Traction Control Module: Service and Repair

"The contents of this article/image reflects the changes called out by TSB - 03-35-004"






M-ASTC Control Unit (M-ASTC-ECU)







REMOVAL AND INSTALLATION

INSTALLATION SERVICE POINTS
>>A<< M-ASTC-ECU INSTALLATION

CAUTION: Perform the following initialization procedure, otherwise the following DTCs will be set.
^ DTC No.81: G NO ADJ
^ DTC No.84: TF NO CHECK
^ DTC No.85: M/CYL PRS NO CHECK

When installing a new M-ASTC-ECU, perform the initialization as follows, ensuring that the vehicle remains level.
1. Place the selector lever in the "P" position.





2. Connect scan tool MB991502 to the data link connector.
3. Turn the ignition switch to the "ON" position.
4. Execute item No.16 "G SNSR: " on the Actuator test.
5. Depress the brake pedal by a pressure of approximately 40 kg quickly once.
6. Place the shift lever in the N range.

CAUTION: If the transfer is not engaged properly when the transfer lever is moved to each position, the initialization has not been completed successfully.

7. Move the transfer lever through all of it's positions (@H,H, 4HLc, 4LLc).
8. Drive the vehicle straight ahead over 25 mph for at least on second. Verify that the ASC-OFF light goes out.

CAUTION: The initialization has not been completed while the ASC OFF indicator is illuminated and the ASC indicator is flashing. If this light do not go off, the system does not recognize the transfer position correctly. Repeat Step 7 If necessaryy.

9. Ensure that the ASC OFF indicator and the ASC indicator are off.
10. Turn the ignition switch to the "LOCK" (OFF) position.
11. Disconnect the scan tool.



>>B<< CANCELLING THE HBB BUZZER OPERATION CHECK MODE (WHEN REPLACING THE ASTC-ECU)
If the ignition switch is turned to the "ON" position after replacing the M-ASTC-ECU, the HBB buzzer will sound for approximately five seconds. This is because the M-ASTC-ECU is at the HBB buzzer operation check mode (for factory production line). To stop the tone alarm, carry out one of the following procedures.
^ Erase HBB diagnostic trouble codes by using scan tool MB991502 or special tool MB991529.
^ Drive the vehicle at 40 km/h (25 mph) or more.