Inspection Procedure 3

INSPECTION Procedure 3: When the Shift Lever is Moved to "N" Position, Cruise Control is not Cancelled [TC-SST.]

CIRCUIT OPERATION
When the shift lever is in the "N" position, the "N" position signal is transmitted from the shift lever ECU to the ECM via CAN bus line.

COMMENT
- Malfunction of CAN bus line.
- Malfunction of shift lever system.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the shift lever system.
- Malfunction of the shift lever ECU.
- Malfunction of the TC-SST-ECU.
- Malfunction of the ECM.

DIAGNOSTIC PROCEDURE

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

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.
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.

Q: Is the check result satisfactory?

YES : Go to Step 2

NO : Repair the CAN bus lines. Then go to Step 7.

STEP 2. Using scan tool MB991958, check the shift lever system data list item 01: Shift lever position.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for shift lever system.
- Item 01: Shift lever position.

Q: Is the switch operating properly?

YES : Go to Step 3.

NO : Repair the shift lever system. Then go to Step 7.

STEP 3. Using scan tool MB991958, read the shift lever system DTC.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for shift lever system DTC.

Q: Is any DTC set?

YES : Repair the shift lever system. Then go to Step 7.

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, read the TC-SST system DTC.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for shift lever system DTC.

Q: Is any DTC set?

YES : Repair the TC-SST system. Then go to Step 7.

NO : Go to Step 5.

STEP 5. Using scan tool MB991958, check data list item 88: Neutral switch.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system.
- Item 88: Neutral switch.
- When shift lever is at the "N" or "P" position, the display on scan tool MB991958 should be "ON".
- When shift lever is other than "N" or "P" position, the display on scan tool MB991958 should be "OFF".

Q: Is the switch operating properly?

YES : Go to Step 6.

NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 7.

STEP 6. Check the symptoms.

Q: When the shift lever is moved to "N" position, is the cruise control cancelled?

YES : It can be assumed that this malfunction is intermittent.

NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 7.

STEP 7. Check the symptoms.

Q: When the shift lever is moved to "N" position, is the cruise control cancelled?

YES : The procedure is complete.

NO : Return to Step 1.