C1290

DTC C1290: CAN time-out error

CAUTION:
^ If the diagnostic trouble code C1290 is set in ASC-ECU, always diagnose the CAN bus line. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
^ Before replacing the ECU, ensure that the communication circuit is normal.
^ When the diagnostic trouble code C1290 is set in ASC-ECU, the diagnostic trouble code for another system may also be set. When the diagnostic trouble code for another system is set, carry out diagnosis for that system first.

CIRCUIT OPERATION
ASC-ECU receives signals necessary for the operations of ABS, ASC, and TCL from the engine ECU, A/T-ECU, AWD-ECU, ETACS-ECU, and the steering wheel sensor via the CAN bus lines.

DTC SET CONDITIONS
ASC-ECU receives signals necessary for the operations of ABS, ASC, and TCL from the engine ECU, A/T-ECU, AWD-ECU, ETACS-ECU, and steering wheel sensor via CAN bus lines. This diagnostic trouble code is stored when ASC-ECU cannot receive the signals necessary for the operations of ABS, ASC, and TCL from the engine ECU, A/T-ECU, AWD-ECU, ETACS-ECU, and steering wheel sensor.

PROBABLE CAUSES
^ Engine ECU malfunction
^ Malfunction of A/T-ECU
^ AWD-ECU malfunction
^ Steering wheel sensor malfunction
^ Malfunction of the CAN bus
^ ASC-ECU malfunction
^ Malfunction of ETACS-ECU

DIAGNOSIS

Required Special Tools:
^ MB991958: Scan Tool (M.U.T.-III Sub Assembly)
^ MB991824: Vehicle Communication Interface (V.C.I.)
^ MB991827: M.U.T.-III USB Cable
^ MB991910: M.U.T.-III Main Harness A

STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. On completion, go to Step 5.

STEP 2. M.U.T.-III diagnostic trouble code
Check that the diagnostic trouble codes U0100, U0101, U0114, U0126, and U0141 are set in ASC-ECU.
Q: Is any DTC set?
YES: Troubleshoot for the relevant diagnostic trouble code.
NO: Go to Step 3.

STEP 3. M.U.T.-III other system diagnostic trouble code
Using scan tool, check if the diagnostic trouble codes are set from the engine ECU, A/T-ECU, AWD-ECU and ETACS-ECU or not.
Q: Is any DTC set?
YES: Troubleshoot the relevant diagnostic trouble code, and then go to Step 4.
NO: Go to Step 5.

STEP 4. Check whether the diagnostic trouble code is reset.
Q: Is DTC C1290 set?
YES: Replace the ASC-ECU. Go to Step 5.
NO: If the trouble symptom is resolved, an intermittent malfunction such as poorly engaged connector(s) or wiring harness is suspected.

STEP 5. Check whether the diagnostic trouble code is reset.
Q: Is DTC C1290 set?
YES: Return to Step 1.
NO: The procedure is complete.