INSPECTION PROCEDURE 4: Auto-cruise Control cannot be Set.: Diagnosis

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A

STEP 1. Using scan tool MB991958, read the 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. (Refer to DIAGNOSTIC FUNCTION ).
  
  Fig 1: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Check for auto-cruise control system diagnostic trouble code. (Refer to DIAGNOSTIC FUNCTION ).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is DTC set?
1. YES : Diagnose the auto-cruise control system. (Refer to DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step 7.
2. NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list item 04: Cancel Switch.
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 DIAGNOSTIC FUNCTION ).
  
  Fig 2: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. (Refer to DIAGNOSTIC FUNCTION ).
  - Item 04, Cancel Switch.
    - When "CANCEL" switch is at the ON position, the display on scan tool MB991958 should be "ON".
    - When "CANCEL" switch is at the OFF position, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
1. YES : Go to Step 3.
2. NO : Refer to SYMPTOM PROCEDURES - INSPECTION PROCEDURE 3 . Then go to Step 7.
STEP 3. Using scan tool MB991958, check data list item 05: Stoplight Switch.
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 DIAGNOSTIC FUNCTION ).
  
  Fig 3: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. (Refer to DIAGNOSTIC FUNCTION ).
  - Item 05: Stoplight Switch.
    - When brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
1. YES : Go to Step 4.
2. NO : Refer to SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1 . Then go to Step 7.
STEP 4. Using scan tool MB991958, check data list item 06: Brake switch.
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 DIAGNOSTIC FUNCTION ).
  
  Fig 4: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. (Refer to DIAGNOSTIC FUNCTION ).
  - Item 06, Brake Switch.
    - When brake pedal is depressed, the display on scan tool MB991958 should be "ON".
    - When brake pedal is released, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
1. YES : Go to Step 5.
2. NO : Refer to SYMPTOM PROCEDURES - INSPECTION PROCEDURE 1 . Then go to Step 7.
STEP 5. Using scan tool MB991958, check data list item 07: Transmission Range Switch.
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 DIAGNOSTIC FUNCTION ).
  
  Fig 5: Connecting Scan Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for auto-cruise control system. (Refer to DIAGNOSTIC FUNCTION ).
  - Item 07, Transmission Range Switch.
    - When selector lever is at the "P" or "N" position, the display on scan tool MB991958 should be "ON".
    - When selector lever is at the "R" or "D" position, the display on scan tool MB991958 should be "OFF".
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
1. YES : Go to Step 6.
2. NO : Refer to SYMPTOM PROCEDURES - INSPECTION PROCEDURE 2 . Then go to Step 7.
STEP 6. Check the symptoms.
Q: Can auto-cruise control be set?
1. YES : It can be assumed that this malfunction is intermittent (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO : Replace the PCM [Refer to POWER CONTROL MODULE (PCM) ]. Then go to Step 7.
STEP 7. Check the symptoms.
Q: Can auto-cruise control be set?
1. YES : The procedure is complete.
2. NO : Return to Step 1.