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. (Refer to .)
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.(Refer to , , , and .)

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
Connector disconnected or improperly connected
Stretched or broken wires

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?

	Go to Step 2.

	Repair the CAN bus lines. (Refer to GROUP 54C - Troubleshooting .) 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 U0251 is set in ASC-ECU.

Q. Is any DTC set?

	Perform troubleshooting for the diagnostic trouble code that is set. ( Refer to .)

	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?

	Perform troubleshooting for the diagnostic trouble code that is set. Then go to Step 4.

	Go to Step 4.

STEP 4. ETACS-ECU coding data check

Check the following coding data stored in ETACS-ECU. (Refer to GROUP 00 - Coding Table

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?

	Go to Step 5.

	Replace the ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU .) Then go to Step 6.

STEP 5. Check whether the DTC is reset.

Q. Is DTC C1290 set?

	Replace the hydraulic unit (incorporates in ASC-ECU).(Refer to .) Then go to Step 6.

	Intermittent malfunction. (Refer to GROUP 00 - How to Cope with Intermittent Malfunction .)

STEP 6. Check whether the DTC is reset.

Q. Is DTC C1290 set?

	Return to Step 1.

	The procedure is complete.