DTC U1100: Powertrain Control Module Time-Out (Related To Engine); DTC U1101: Powertrain Control Module Time-Out (Related To A/T): Diagnosis

Required Special Tools:

MB991223: Harness Set
MB992006: Extra Fine Probe
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: 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.
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. Refer to "HOW TO CONNECT SWS MONITOR ."
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.
Q: Is the CAN bus line found to be normal?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus line (Refer to DIAGNOSIS ).
Fig 1: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958, read the MFI system diagnostic trouble code.
Check whether engine and transaxle DTCs are set or not.
1. Turn the ignition switch to the "ON" position.
2. Check for engine and transaxle DTCs.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Diagnose the MFI system by referring to DIAGNOSTIC TROUBLE CODE CHART .
2. NO: Go to Step 3.
Fig 2: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 3. Using scan tool MB991958, read the for any diagnostic trouble code.
Check if a DTC, which relates to CAN communication-linked systems below, is set.
- Combination meter
  DTC indicating a time-out error related to the engine or automatic transaxle control system
- A/C
  DTC indicating a time-out error related to the engine or automatic transaxle control system
1. Turn the ignition switch to the "ON" position.
2. Check for a DTC related to the relevant system.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Go to Step 4.
2. NO: Go to Step 5.
Fig 3: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Replace the powertrain control module. On completion, verify that the DTC is not reset.
2. NO: A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the powertrain control module and the ETACS-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
Fig 4: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
1. Turn the ignition switch to the "ON" position.
2. Check if the DTC is set.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
1. YES: Replace the ETACS-ECU. When the ETACS-ECU is replaced, register the encrypted code. Refer to ENCRYPTED CODE REGISTRATION CRITERIA TABLE . On completion, verify that the DTC is not reset.
2. NO: A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the powertrain control module and the ETACS-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
Fig 5: Connecting Scan Tool To Data Link Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.