DTC U1112: SRS-ECU Time-out: Diagnosis

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool MB991958 to diagnose the CAN bus lines.
1. Connect scan tool MB991958 to the data link connector.
  
  Fig 1: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to "ON" position.
3. Diagnose the CAN bus line.
Q: Is the check result satisfactory?
1. YES : Go to Step 2.
2. NO : Repair the CAN bus lines (Refer to DIAGNOSIS-CAN BUS DIAGNOSTIC CHART < vehicles without advanced air bag > or < vehicles with advanced air bag>). On completion, go to Step 4.
STEP 2. Using scan tool MB991958, read SRS diagnostic trouble code.
Check that the SRS-ECU sets a DTC.

Q: Is the DTC set?
1. YES : Refer to DIAGNOSIS-DIAGNOSTIC TROUBLE CODE CHART < vehicles without advanced air bag > or < vehicles with advanced air bag>.
2. NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
1. YES : A poor connection, open circuit or other intermittent malfunction is present in the lines between the SRS-ECU and the combination meter (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS-HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO : Replace SRS-ECU and then go to step 4.
STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
1. YES : The procedure is complete.
2. NO : Go to Step 1.