Inspection Procedure 4

Inspection Procedure 4: When the "CANCEL" Switch is Pressed, Cruise Control is not Cancelled.

COMMENT

The cause is probably an open-circuit in the output circuit inside the "CANCEL" switch.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)

- Malfunction of the cruise control switch.
- 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

STEP 1. Using scan tool MB991958, check the data list item 75: Cancel switch.





(1)
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 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 (Refer to Scan Tool Testing and Procedures.)

- Item 75: Cancel switch.
- When "CANCEL" switch is at the "ON" position, the display on scan tool MB991958 should be "ON".
- When "CANCEL" switch is at the "OFF" position, the display on scan tool MB991958 should be "OFF".

Q. Is the switch operating properly?

YES Go to Step 2.

NO Repair the cruise control switch system (Refer to DTC 15, Diagnosis Code Procedures - DTC 15: Cruise Control Switch System.) Then go to Step 3 .

STEP 2. Check the symptom.

Q. When the "CANCEL" switch is pressed, is the cruise control cancelled?

YES It can be assumed that this malfunction is intermittent How to Cope With Intermittent Malfunctions.)
NO Replace the ECM [ Removal and Replacement.] Then go to Step 3.
STEP 3. Check the symptom.

Q. When the "CANCEL" switch is pressed, is the cruise control cancelled?

YES The procedure is complete.
NO Return to Step 1.