Inspection Procedure 2

Inspection Procedure 2: When the Selector Lever is Moved to "N" Position, Auto-cruise Control System is not Cancelled.

Transmission Range Switch Circuit Part 1:

Transmission Range Switch Circuit Part 2:

CIRCUIT OPERATION
When the selector lever is in the "N" range, the signal is transmitted from the Transaxle Control Module (TCM) to the ECM via CAN bus line.

COMMENT
Malfunction of A/T system.
Malfunction of CAN bus line.

TROUBLESHOOTING HINTS (The most likely causes for this case:)
Malfunction of the transmission range switch.
Damaged harness or connector.
Malfunction of the TCM.
Malfunction of the ECM.

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, 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.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the check result satisfactory?

YES: Go to Step 2

NO: Repair the CAN bus lines. Then go to Step 4.

STEP 2. Using scan tool MB991958, read the A/T system diagnostic trouble code.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check for A/T system diagnostic trouble code (Refer to Automatic Transaxle Diagnosis - Diagnostic Function - How to Read and Erase Diagnostic Trouble Codes).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES: Diagnose the A/T system (Refer to Automatic Transaxle Diagnosis - Diagnostic Trouble Code Chart). Then go to Step 4.

NO: Go to Step 3.

STEP 3. Check the symptoms.

Q: When the selector lever is moved to "N" position, autocruise control system is cancelled?

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

NO: Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Diagnosis - ID Code Registration Necessity Judgment Table). Then go to Step 4.

STEP 4. Check the symptoms.

Q: When the selector lever is moved to "N" position, autocruise control system is cancelled?

YES: The procedure is complete.

NO: Return to Step 1.