Inspection Procedure 3

Inspection Procedure 3: When the Selector Lever is Moved to "N" Position, Cruise Control is not Cancelled [CVT.]

CIRCUIT OPERATION
When the selector lever is operated, the selector lever position 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 CVT system.
- Malfunction of the transmission range switch.
- Malfunction of the TCM.
- Malfunction of the ECM.

DIAGNOSIS 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. (Refer to Trouble code diagnosis.) Testing and Inspection

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. Reading and Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. Reading and Clearing Diagnostic Trouble Codes

Q: Is the check result satisfactory?

YES : Go to Step 2

NO : Repair the CAN bus lines. Then go to Step 6.

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. Reading and Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for CVT system. (Refer to Diagnosis - Diagnostic Function.) Diagnostic Troubleshooting Strategy
- Item 49: Transmission range switch.

Q: Is the switch operating properly?

YES : Go to Step 3.

NO : Repair the CVT system. Then go to Step 6.

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

1. Connect scan tool MB991958 to the data link connector. Reading and Clearing Diagnostic Trouble Codes
2. Turn the ignition switch to the "ON" position.
3. Check for CVT system DTC. (Refer to Diagnosis - Diagnostic Function.) Diagnostic Troubleshooting Strategy

Q: Is any DTC set?

YES : Repair the CVT system. Then go to Step 6.

NO : Go to Step 4.

STEP 4. Using scan tool MB991958, check data list item 88: Neutral switch.

1. Connect scan tool MB991958 to the data link connector. Reading and Clearing 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. Reading and Clearing Diagnostic Trouble Codes
- Item 88: Neutral switch.
- When selector lever is at the "P" and "N" position, the display on scan tool MB991958 should be "ON."
- When selector lever is other than "P" and "N" position, the display on scan tool MB991958 should be "OFF."

Q: Is the switch operating properly?

YES : Go to Step 5.

NO : Replace the ECM. When the ECM is replaced, register the encrypted code. Then go to Step 6.

STEP 5. Check the symptoms.

Q: When the selector 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 6.

STEP 6. Check the symptoms.

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

YES : The procedure is complete.

NO : Return to Step 1.