Inspection Procedure 1: When the Brake Pedal is Depressed, Cruise Control is not Cancelled: 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

CAUTION: If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code (DTC) may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS ).

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 (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
Q: Is the check result satisfactory?
1. YES: Go to Step 2.
2. NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS TABLE ). Then go to Step 4.
  
  Fig 1: Connecting Special Tool MB991910 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958, check data list item 74: Brake light switch and item 89: Normally closed brake switch.
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. Set scan tool MB991958 to data reading mode for cruise control system (Refer to HOW TO ERASE DIAGNOSTIC TROUBLE CODES ).
  - Item 74: Brake light switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF."
  - Item 89: Normally closed brake switch.
    - When the brake pedal is depressed, the display on scan tool MB991958 should be "ON."
    - When the brake pedal is released, the display on scan tool MB991958 should be "OFF."
Q: Is the switch operating properly?
1. YES: Go to Step 3
2. NO: Repair the stoplight switch system (Refer to DTC 22: STOPLIGHT SWITCH SYSTEM ). Then go to Step 4.
STEP 3. Check the symptoms.
Q: When the brake pedal is depressed, is the cruise control cancelled?
1. YES: It can be assumed that this malfunction is intermittent (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: 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 4.
STEP 4. Check the symptoms.
Q: When the brake pedal is depressed, is the cruise control cancelled?
1. YES: The procedure is complete.
2. NO: Return to Step 1.