Traction Control/Active Stability Control System (TCL/ASC)

DTC U1101: CAN Communications System Time Out Error A/T Related Data

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DTCS ARE TO SET ARE:)

CAUTION:

- If DTC U1101 is set in the TCL/ASC-ECU, always diagnose the CAN main bus line. If there is any fault in the CAN bus lines, an incorrect DTC may be set.
- Whenever the TCL/ASC-ECU is replaced, ensure that the communication circuit is normal.

DTC SET CONDITION

The TCL/ASC-ECU receives A/T system-related signals from the PCM via CAN bus lines.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THESE DTCS ARE TO SET ARE:)

- Damaged harness or connector.
- Malfunction of the PCM.
- Malfunction of the TCL/ASC-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. Using scan tool MB991958, diagnose the CAN bus line.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Diagnose the CAN bus line.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is the CAN bus line found to be normal?

YES Go to Step 2.

NO Repair the CAN bus lines. CAN Bus Diagnostics Chart). Then go to Step 6.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Check for A/T system diagnostic trouble code. Reading and Clearing Diagnostic Trouble Codes).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is any DTC set?

YES Diagnose the automatic transaxle control system. Automatic Transmission). Then go to Step 6.

NO Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Check if a DTC, which relates to CAN communication-linked systems below, is set.

ETACS-ECU
- DTC U1101: Power train control module time-out (related to A/T). Reading and Clearing Diagnostic Trouble Codes ).
Combination meter
- DTC U1101: Power train control module time-out (related to A/T). Reading and Clearing Diagnostic Trouble Codes ).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is DTC U1101 set?

YES Go to Step 4.

NO Go to Step 5.

STEP 4. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Use scan tool MB991958 to read the TCL/ASC diagnostic trouble codes. (Refer to Reading and Clearing Diagnostic Trouble Codes).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is DTC U1101 set?

YES Replace the PCM. [ Removal and Replacement [2.4L ENGINE] or Engine Control Module (ECM) and Power Control Module (PCM) Removal and Replacement [3.8L ENGINE]]. Then go to Step 6.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions).

STEP 5. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Use scan tool MB991958 to read the TCL/ASC diagnostic trouble codes. (Refer to Reading and Clearing Diagnostic Trouble Codes).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is DTC U1101 set?

YES Replace the hydraulic unit (integrated with TCL/ASC-ECU). Then go to Step 6.

NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions).

STEP 6. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958 to the data link connector.
(2)Turn the ignition switch to the "ON" position.
(3)Use scan tool MB991958 to read the TCL/ASC diagnostic trouble codes. (Refer to Reading and Clearing Diagnostic Trouble Codes).
(4)Turn the ignition switch to the "LOCK" (OFF) position.
(5)Disconnect scan tool MB991958.

Q. Is DTC U1101 set?

YES Return to Step 1.

NO The procedure is complete.