Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection Procedure 2: When the Selector Lever is Moved to "N" Position, Auto-cruise Control System is not Cancelled: 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.
- Connect scan tool MB991958 to the data link connector (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
- Turn the ignition switch to the "ON" position.
- Diagnose the CAN bus line (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
- Turn the ignition switch to the "LOCK" (OFF) position.
- Disconnect scan tool MB991958.
Q: Is the check result satisfactory?
YES: Go to Step 2
NO: Repair the CAN bus lines (Refer to CAN BUS DIAGNOSTICS CHART ). Then go to STEP 4.
- STEP 2. Using scan tool MB991958, read the A/T system diagnostic trouble code.
- Connect scan tool MB991958 to the data link connector (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
- Turn the ignition switch to the "ON" position.
- Check for A/T system diagnostic trouble code (Refer to HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES ).
- Turn the ignition switch to the "LOCK" (OFF) position.
- Disconnect scan tool MB991958.
Q: Is any DTC set?
YES: Diagnose the A/T system (Refer to 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 (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTIONS ).
NO: Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to 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.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.