DTC 36, 38: Communication error in power control module: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (MUT-III Sub Assembly)
  • MB991824: Vehicle Communication Interface (V.C.I.)
  • MB991827: MUT-III USB Cable
  • MB991911: MUT-III Main Harness B
• MB991223: Harness Set

1. STEP 1. CAN main bus line diagnostics 
   CAUTION: If DTC 36 or 38 is set, diagnose the CAN main bus line.

   Diagnose the CAN main bus line. Refer to DIAGNOSTIC ITEM 1: CAN MAIN BUS LINE DIAGNOSTICS  .

   If the CAN main bus line is repaired, check that the diagnostic trouble code resets.

   Q: Have you completed checking or repairing the CAN main bus line? 

   1. YES (If the CAN main bus line is repaired):  Go to  Step 3.
   2. YES (If the CAN main bus line is not defective):  Go to Step 2.
   3. NO:  Diagnose the CAN main bus line. Refer to DIAGNOSTIC ITEM 1: CAN MAIN BUS LINE DIAGNOSTICS  .
2. STEP 2. Using scan tool MB991958, read the MFI 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 the MFI DTC is set.
   4. Turn the ignition switch to the "LOCK (OFF)" position.
   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

   Q: Are MFI DTCs set? 

   1. YES:  Diagnose the power control module. Refer to MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS .
   2. NO:  Replace the M-ASTC-ECU, and then go to Step 3.
3. STEP 3. Recheck for diagnostic trouble code. 

   Q: Does DTC 36 or 38 reset? 

   1. YES:  Return to  Step 1.
   2. NO:  The procedure is complete.