Traction Control System (Tcl)

U1100 CAN Communications System Time Out Error Engine Related Data

CAUTION:
- If DTC U1100 is set in the ABS/TCL-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 ECU is replaced, ensure that the communication circuit is normal.

DTC SET CONDITION
The ABS/TCL-ECU receives engine system-related signals from the powertrain control module (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 ABS/TCL-ECU.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan tool (MUT-III sub assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB cable
- MB991910: MUT-III main harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

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.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. (refer to, Diagnostic Trouble Code Diagnosis - How to 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 line (Refer to Diagnosis). Then go to Step 6.

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

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.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system diagnostic trouble code.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES: Repair the MFI control system. Then go to Step 6.

NO: Go to Step 3.

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

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.

1. 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 011: Power train control module time-out (related to engine)

Combination meter
- DTC 011: Power train control module time-out (related to engine)

Multi-center display
- DTC 011: Power train control module time-out (related to engine)

A/C-ECU
- DTC U1100: Power train control module time-out (related to engine)

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is DTC 011 or U1100 set?

YES: Go to Step 4.

NO: Go to Step 5.

STEP 4. Recheck for diagnostic trouble code.

Check again if the DTC is set.

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.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Erase the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Turn the ignition switch to the "ON" position.
6. Check if the DTC is set.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Disconnect scan tool MB991958.

Q: Is DTC U1100 set?

YES: Replace the PCM. Then go to Step 6.

NO: It can be assumed that this malfunction is intermittent. Refer to, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.

STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set.

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.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Erase the DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Turn the ignition switch to the "ON" position.
6. Check if the DTC is set.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Disconnect scan tool MB991958.

Q: Is DTC U1100 set?

YES: Replace the hydraulic unit (integrated with ABS/TCL-ECU) (Refer to - Hydraulic Unit). Then go to Step 6.

NO: It can be assumed that this malfunction is intermittent. Refer to, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.

STEP 6. Recheck for diagnostic trouble code.

Check again if the DTC is set.

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.