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DTC C1613: AWC Switch System (Stuck ON)










caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

OPERATION



DTC SET CONDITIONS


If the AWC switch is on sticking, the code is set.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting ). After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. J/C (3), Intermediate connector, AWC-ECU connector, AWC switch connector check: C-07, C-36, C-51, C-50

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector. Then go to Step 8.

STEP 4. Wiring harness check between C-51 AWC-ECU connector terminal No.21 and C-50 AWC switch connector terminal No.1.
Check the output line for short (for short to the power supply) circuit.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness. Then go to Step 8.

STEP 5. Scan tool data list
Item No.89: AWC switch (Refer to data list reference table ).

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. AWC switch check.
Check the AWC switch. (Refer to ).

Q. Is the check result normal?
Go to Step 7.
Replace the AWC switch. (Refer to ). Then go to Step 8.

STEP 7. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?
Replace the AWC-ECU. (Refer to ). Then go to Step 8.
Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

STEP 8. Check whether the DTC is reset.

Q. Is DTC No. C1613 set?
Return to Step 1.
This diagnosis is complete.