DTC 62

DTC 62: ACD Mode Changeover Switch System

ACD Mode Changeover Switch System Circuit:

CIRCUIT OPERATION
The AWD-ECU receives a control mode (tarmac, gravel, snow) from the ACD mode changeover switch.

DTC SET CONDITIONS
DTC 62 is set when the ACD mode changeover switch is ON for more than 60 seconds.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CODE TO BE SET ARE:)
^ Malfunction of the ACD mode changeover switch
^ Damaged harness and connector
^ Malfunction of the AWD-ECU

DIAGNOSIS
Required Special Tool:
^ MB991958: Scan Tool (M.U.T-III Sub Assembly)
^ MB991824: V.C.I.
^ MB991827: USB Cable
^ MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 63: ACD Mode Changeover Switch.





CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.

1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 63: ACD Mode Changeover Switch.
^ When the ACD mode changeover switch is pressed, ON is displayed.
^ When the ACD mode changeover switch is released, OFF is displayed.

4) Turn the ignition switch to the Lock (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Go to Step 2.

STEP 2. Check the ACD mode changeover switch.
Refer to Sensor, Switch and Relay. Service and Repair
Q: Is the check result normal?
YES: Go to Step 3.
NO: Replace the ACD mode changeover switch.

STEP 3. Measure the voltage at ACD mode changeover switch connector C-136.








1) Disconnect the ACD mode changeover switch connector, and measure the voltage between terminal 2 and ground.
2) Turn the ignition switch to the ON position.
^ The voltage should measure battery positive voltage.

3) Turn the ignition switch to the Lock (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 7.
NO: Go to Step 4.

STEP 4. Check joint connector (4) C-23, ACD mode changeover switch connector C-136, junction block connector C-211, C-214 for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 5.
NO: Repair or replace the damaged components.

STEP 5. Check the harness for open circuit or short circuit to ground between ignition switch and ACD mode changeover switch connector C-136 terminal 2.





Q: Is the harness wire in good condition?
YES: Go to Step 6.
NO: Repair or replace the harness wire.

STEP 6. Using scan tool MB991958, check data list item 63: ACD Mode Changeover Switch.





CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the LOCK (OFF) position before connecting or disconnecting scan tool MB991958.

1) Connect scan tool MB991958 to the data link connector.
2) Turn the ignition switch to ON position.
3) Set scan tool MB991958 to the data reading mode.
^ Item 63: ACD Mode Changeover Switch.
^ When the ACD mode changeover switch is pressed, ON is displayed.
^ When the ACD mode changeover switch is released, OFF is displayed.

4) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the switch operating properly?
YES: It can be assumed that this malfunction is intermittent.
NO: Replace the AWD-ECU

STEP 7. Measure the ACD mode switch output voltage at AWD-ECU connector C-138 by backprobing.








1) Turn the ignition switch to the ON position.
2) Measure the voltage between AWD-ECU connector C-138 terminal 47 and ground by backprobing.
^ The voltage should measure battery positive voltage

3) Turn the ignition switch to the LOCK (OFF) position.
Q: Is the measured voltage battery positive voltage?
YES: Go to Step 10.
NO: Go to Step 8.

STEP 8. Check intermediate connector C-122, ACD mode changeover switch connector C-136 and AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.











Q: Are the connectors and terminals in good condition?
YES: Go to Step 9.
NO: Repair or replace the damaged components.

STEP 9. Check the harness for open circuit or short circuit to ground between ACD mode changeover switch connector C-136 terminal 1 and AWD-ECU connector C-138 terminal 47.








Q: Is the harness wire in good condition?
YES: Go to Step 6.
NO: Repair or replace the harness wire.

STEP 10. Check AWD-ECU connector C-138 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q: Are the connector and terminals in good condition?
YES: Go to Step 6.
NO: Repair or replace the damaged components.