Inspection Procedure 5
Inspection Procedure 5: The Combination Meter Light Does Not Illuminate Normally Or The Multi Information Display Is Not Displayed Normally.CAUTION: Before replacing the combination meter, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.
TECHNICAL DESCRIPTION (COMMENT)
When the signal from each ECU is received via the CAN communication, the combination meter illuminates the corresponding display light or warning light, or has the multi information display to display corresponding information.
If the lights do not illuminate or the multi information display does not display normally, the wiring harness and connector(s) in the CAN bus lines, or the each ECU or the combination meter may have a problem.
TROUBLESHOOTING HINTS
- The combination meter may be defective
- The each ECU may be defective
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
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. Refer to "How to connect the Scan Tool (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q : Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to Controller Area Network, Diagnosis).
STEP 2. Using scan tool MB991958, read the combination meter diagnostic trouble code.
Check again if the DTC is set to the combination meter.
Q : Is the DTC set?
YES : Troubleshoot the combination meter. Diagnostic Trouble Code Descriptions
NO : Go to Step 3.
STEP 3. Using scan tool MB991958, read for any diagnostic trouble code.
Check again if the DTC is set to the engine control module, TC-SST-ECU, WCM, KOS-ECU, ASC-ECU, SRS-ECU, ETACS-ECU and A/C-ECU.
Q : Is the DTC set to the any of the above?
YES [Set to the engine control module.] : Troubleshoot the engine control module (Refer to MFI, Diagnosis).
YES [Set to the TC-SST-ECU.] : Troubleshoot the TC-SST (Refer to Twin Clutch-Sportronic Shift Transmission, Diagnosis).
YES [Set to the ASC-ECU.] : Troubleshoot the ASC (Refer to Active Skid Control System, Diagnosis).
YES [Set to the WCM.] : Troubleshoot the WCM (Refer to Wireless Control Module, diagnosis).
YES [Set to the KOS-ECU.] : Troubleshoot the KOS (Refer to Keyless Operation System, Diagnosis).
YES [Set to the SRS-ECU.] : Troubleshoot the SRS (Refer to SRS, Diagnosis).
YES [Set to the ETACS-ECU.] : Troubleshoot the ETACS. Diagnostic Trouble Code Descriptions
YES [Set to the A/C-ECU.] : Troubleshoot the A/C. Diagnostic Trouble Code Descriptions
NO [The diagnostic trouble code is not set.] : Go to Step 4.
STEP 4. Using scan tool MB991958, check actuator test.
1. Turn the ignition switch to the "ON" position.
2. Conduct the actuator test of the combination meter.
- Item 7: Indicator1
- Item 8: Indicator2
- Item 9: Indicator3
- Item 11: Shift indicator
- Item 13: Indicator4
- Perform the actuator test, and check that display lights or warning lights are illuminated normally, or multi information display is displayed normally.
3. Turn the ignition switch to the "LOCK" (OFF) position.
Q : Is the check result normal?
YES : Go to Step 5.
NO : Replace the combination meter.
STEP 5. Retest the system.
Check that display lights or warning lights are illuminated normally, or multi information display is displayed normally.
Q : Is the check result normal?
YES : The trouble can be an intermittent malfunction (Refer to General (Body and Chassis) -How to use Troubleshooting/inspection Service Points -How to Cope with Intermittent Malfunction).
NO : Replace the combination meter.