Inspection Procedure 7
Inspection Procedure 7: When the "ON/OFF" Switch is Turned ON, "CRUISE" Indicator Light does not Illuminate (However, Cruise Control System is Normal.)
CIRCUIT OPERATION
- The ECM detects "ON/OFF" switch ON signal to illuminate the "CRUISE" indicator light.
- The "CRUISE" indicator light illuminate signal is transmitted from the ECM to the combination meter via CAN bus line.
COMMENT
- The CAN bus line between the ECM and the ETACS-ECU and between the ETACS-ECU and the combination meter may be defective.
- The combination meter, ETACS-ECU or ECM may also be defective.
TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of CAN bus system.
- Damaged harness or connector.
- Malfunction of the combination meter.
- Malfunction of the ETACS-ECU.
- 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
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 Initial Inspection and Diagnostic Overview.)
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(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)Diagnose the CAN bus line (Refer to Scan Tool Testing and Procedures.)
Q. Is the check result satisfactory?
YES Go to Step 2
NO Repair the CAN bus lines CAN Bus Diagnostics Chart.) Then go to Step 6.
STEP 2. Using scan tool MB991958, check for MFI system DTC.
(1)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)Check for MFI system DTC Reading and Clearing Diagnostic Trouble Codes.)
Q. Is DTC U0141 set?
YES Repair the MFI system Multiport Fuel Injection (MFI).) Then go to Step 6.
NO Go to Step 3.
STEP 3. Using scan tool MB991958, check for ETACS system DTC.
(1)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)Check for ETACS system DTC Reading and Clearing Diagnostic Trouble Codes.)
Q. Is DTC U0155 set?
YES Repair the ETACS system Electronic Time and Alarm Control System (ETACS).) Then go to Step 6.
NO Go to Step 4.
STEP 4. Using scan tool MB991958, check the combination meter system actuator test item 7: Cruise indicator 1.
(1)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 check the actuator test for combination meter system item 7: indicator 1 Pinout Values and Diagnostic Parameters.)
Q. Is the check result satisfactory?
YES Go to Step 5.
NO Repair the combination meter system Inspection Procedure 5.) Then go to Step 6.
STEP 5. Check the symptom.
Q. When the "ON/OFF" switch is turned ON, is the "CRUISE" indicator light illuminated?
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 6.
STEP 6. Check the symptom.
Q. When the "ON/OFF" switch is turned ON, is the "CRUISE" indicator light illuminated?
YES The procedure is complete.
NO Return to Step 1.