DTC 23: ECM and Its Related Component: Diagnosis

Required Special Tools:

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, check for MFI system DTC.
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 (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system DTC (Refer to DIAGNOSTIC FUNCTION ) < 2.0L ENGINE Non-turbo >, (Refer to DIAGNOSTIC FUNCTION ) < 2.0L ENGINE Turbo >, or (Refer to DIAGNOSTIC FUNCTION ) < 2.4L ENGINE >.
Q: Is any DTC set?
1. YES: Repair the MFI system (Refer to DIAGNOSTIC TROUBLE CODE TABLE ) < 2.0L ENGINE Non-turbo >, (Refer to DIAGNOSTIC TROUBLE CODE TABLE ) < 2.0L ENGINE Turbo >, or (Refer to DIAGNOSTIC TROUBLE CODE TABLE ) < 2.4L ENGINE >. Then go to Step 3.
2. NO: Go to Step 2.
  
  Fig 1: Connecting Special Tool MB991910 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Read the cruise control system DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery terminal.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to "ON" (turn on the "CRUISE" indicator light.)
4. After turning the cruise control system to ON, when 2 minutes or more has elapsed without operating the cruise control switches, read the DTC of the cruise control system (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
Q: Is DTC 23 set?
1. YES: Replace the ECM [Refer to ENGINE CONTROL MODULE (ECM) ] < 2.0L ENGINE Non-turbo >, [Refer to ENGINE CONTROL MODULE (ECM) ] < 2.0L ENGINE Turbo >, or [Refer to ENGINE CONTROL MODULE (ECM) ] < 2.4L ENGINE. > When the ECM is replaced, register the encrypted code (Refer to ID registration procedure manual - ID codes registration judgement table) < Vehicle with WCM installed >. Then go to Step 3.
2. NO: It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 3. Read the cruise control system DTC.
1. Disconnect the negative (-) battery terminal, to erase the DTC of the cruise control system.
2. Connect the negative (-) battery terminal.
3. Turn the ignition switch to the "ON" position, and press the "ON/OFF" switch to turn the cruise control system to "ON" (turn on the "CRUISE" indicator light.)
4. After turning the cruise control system to "ON", when 2 minutes or more has elapsed without operating the cruise control switches, read the DTC of the cruise control system (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
Q: Is DTC 23 set?
1. YES: Return to Step 1.
2. NO: The procedure is complete.