C1290

DTC C1290: CAN time-out error

CAUTION:
^ If diagnostic trouble code No. C1290 is set in ASC-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect DTC may be set.
^ When the diagnostic trouble code No. C1290 is set in ASC-ECU, a 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.
^ Whenever the ECU is replaced, ensure that the communication circuit is normal.
^ When the steering wheel sensor is replaced, always perform calibration to make ASC-ECU learn the neutral point.
^ When the hydraulic unit (integrated with ASC-ECU) is replaced, always perform the calibration of steering wheel sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve.

CIRCUIT OPERATION
ASC-ECU receives signals necessary for the operations of ABS, stability control, and TCL from the engine control module, transaxle assembly (with built-in ECU) [TC-SST], S-AWC-ECU, ETACS-ECU, and the steering wheel sensor via the CAN bus lines.

DTC SET CONDITIONS
This diagnostic trouble code is stored if ASC-ECU cannot receive signals necessary for the operations of ABS, stability control, and TCL from the engine control module, transaxle assembly (with built-in ECU) [TC-SST], S-AWC-ECU, ETACS-ECU, and the steering wheel sensor.

PROBABLE CAUSES
^ ECM malfunction
^ Malfunction of transaxle assembly [TC-SST]
^ S-AWC-ECU malfunction
^ ETACS-ECU malfunction
^ Steering wheel sensor malfunction
^ Malfunction of the CAN bus
^ ASC-ECU malfunction
^ Interchanging of ETACS-ECU with another vehicle

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. Using scan tool MB991958, diagnose the CAN bus lines.
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES: Go to Step 2.
NO: Repair the CAN bus lines. (Refer to Troubleshooting Can Bus Diagnostics Table.) After repairing the CAN bus line, go to Step 4.

STEP 2. Scan tool diagnostic trouble code
Check that diagnostic trouble code U0100, U0101, U0126, U0141, U0136 or UO251 is set in ASC-ECU.
Q: Is any DTC set?
YES: Perform troubleshooting for the diagnostic trouble code that is set. (Refer to Diagnostic Trouble Code Descriptions.)
NO: Go to Step 3.

STEP 3. Scan tool diagnostic trouble code for other systems
Using scan tool MB991958, check if the diagnostic trouble codes are set from the engine control module, transaxle assembly (with built-in ECU) [TC-SST], S-AWC-ECU, and ETACS-ECU.
Q: Is any DTC set?
YES: Perform troubleshooting for the diagnostic trouble code that is set. Then go to Step 4.
NO: Go to Step 4.

STEP 4. ETACS-ECU coding data check
Check the following coding data stored in ETACS-ECU.

Vehicle line
OK: LANCER EVO

Transaxle
OK (Vehicles without TC-SST): 5MT
OK (Vehicles with TC-SST): TC-SST

Engine type
OK: D4 V.V.T. 2.0L TC

Engine power
OK: Normal

Chassis Type for A.S.C.
OK: Type 1

Final drive
OK: AWD FF Base

Transfer
OK: ACD

SAS
OK: Present

AWD
OK: Not present

TCM
OK (Vehicles without TC-SST): Not present
OK (Vehicles with TC-SST): Present

ACDAYC
OK: Present

Q: Is the check result normal?
YES: Go to Step 5.
NO: Replace the ETACS-ECU. Then go to Step 6.

STEP 5. Check whether the DTC is reset.
Q: Is DTC C1290 set?
YES: Replace the hydraulic unit (incorporates in ASC-ECU). Then go to Step 6.
NO: Intermittent malfunction.

STEP 6. Check whether the DTC is reset.
Q: Is DTC C1290 set?
YES: Return to Step 1.
NO: The procedure is complete.