Traction Control Module: Service and Repair

M-ASTC CONTROL UNIT (M-ASTC-ECU)






REMOVAL AND INSTALLATION
INSTALLATION SERVICE POINTS
>>A<< M-ASTC-ECU INITIALIZATION

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

NOTE: The SS4 indicator is flashing while the scan tool is connected.

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 MB991958 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 to 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 positions (2H, 4H, 4HLc, 4LLc).

CAUTION: The initialization has not been completed while the ASC OFF indicator is illuminating and the ASC indicator is flashing. The system does not recognize the transfer position correctly. Make the system recognize it again.

8. Ensure that the ASC OFF indicator and the ASC indicator are off.
9. Turn the ignition switch to the "LOCK" (OFF) position.
10. Disconnect scan tool MB991958.

>>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 MB991958 or special tool MB991529.
^ Drive the vehicle at 40 km/h (25 mph) or more.