Inspection Procedure 3
Inspection Procedure 3: When the Selector Lever is Moved to "N" Position, Cruise Control System is not Cancelled. [CVT]CIRCUIT OPERATION
When the selector lever is operated, the selector lever signal from the transmission range switch is sent to the TCM. ECM receives the selector lever position signal from the TCM via the CAN bus line.
COMMENT
- Malfunction of CAN bus line.
- Malfunction of CVT system.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the transmission range switch.
- 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
CAUTION: If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines. (Refer to Trouble code diagnosis) Diagnostic Trouble Code Descriptions
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. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. How to 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 5.
STEP 2. Using scan tool MB991958, check the CVT system data list item 49: Transmission range switch.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for CVT system. (Refer to Diagnostic Function. How to Diagnose the CAN Bus Line
- Item 49: Transmission range switch.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 3.
NO : Diagnose the CVT system. Then go to Step 5.
STEP 3. Using scan tool MB991958, read the CVT system DTC.
1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for CVT system DTC.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
Q: Is any DTC set?
YES : Diagnose the CVT system. (Refer to Diagnosis - Diagnostic Trouble Code Chart.) Diagnostic Trouble Code Descriptions Then go to Step 5.
NO : Go to Step 4.
STEP 4. Check the symptoms.
Q: When the selector lever is moved to "N" position, cruise 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. Then go to Step 5.
STEP 5. Check the symptoms.
Q: When the selector lever is moved to "N" position, cruise control system is cancelled?
YES : The procedure is complete.
NO : Return to Step 1.