Mitsubishi Grandis. Manual — part 227
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-370
Step 7. Check the wiring harness from A-32 front
fog lamp (RH) connector or A-24 front fog lamp
(LH) connector terminal No.2 to A-08X front fog
lamp relay connector terminal No.4.
AC311521AD
Connector: A-08X
1
3
2
4
Front of
vehicle
Relay box side
AC310403
A-24 (B)
AG
Connector: A-24 <LHD>
Harness side
AC310398
A-24 (B)
AG
Connector: A-24 <RHD>
Harness side
AC310401
Connector: A-32 <LHD>
Harness side
A-32 (B)
AC
AC310396
Connector: A-32 <RHD>
Harness side
A-32 (B)
AC
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-371
• Check the power supply line for open circuit.
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Repair the wiring harness.
Step 8. Retest the system.
Check that the front fog lamp illuminate normally.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction
NO :
Replace the front fog lamp(s).
Inspection Procedure O-4: The front fog lamp indicator does not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the front fog lamp indicator does not illuminate
normally, connector(s), wiring harness in the CAN
bus lines, the ETACS-ECU or the combination meter
may be defective.
POSSIBLE CAUSES
• The combination meter may be defective
• The ETACS-ECU may be defective
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Check the front fog lamps.
When the front fog lamp switch is operated, check
that the front fog lamps illuminate/go off normally.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure O-3 "Any of
the front fog lamps does not illuminate
."
Step 2. MUT-III CAN bus diagnostics.
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair the CAN bus line (Refer to GROUP
54D, Diagnosis
Step 3. Check for combination meter diagnosis
code.
Check whether the combination meter-related
diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Diagnose the combination meter (Refer to
GROUP 54A
− Troubleshooting
).
NO :
Go to Step 4.
INPUT SIGNAL
ETACS-ECU
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
Front Fog Lamp Indicator Lamp Circuit
FRONT FOG LAMP
SWITCH
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-372
Step 4. ECU check by using the SWS monitor
Check that the power supply and earth lines to the
ETACS-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• ETACS ECU
OK: "OK" is displayed on the "ETACS ECU"
menu.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
Step 5. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the front fog lamp indicator
illuminates (Refer to GROUP 54A
− Combination
).
Q: Is the check result normal?
YES :
Replace the ETACS-ECU.
NO :
Replace the combination meter.
Inspection Procedure O-5: The rear fog lamp indicator does not illuminate normally.
CAUTION
Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
If the rear fog lamp indicator does not illuminate
normally, connector(s), wiring harness in the CAN
bus lines, the ETACS-ECU or the combination meter
may be defective.
POSSIBLE CAUSES
• The combination meter may be defective
• The ETACS-ECU may be defective
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Check the rear fog lamps.
When the rear fog lamp switch is operated, check
that the rear fog lamps illuminate/go off normally.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Refer to Inspection Procedure O-2 "The rear
fog lamp do not illuminate normally
."
Step 2. MUT-III CAN bus diagnostics.
Use the MUT-III to diagnose the CAN bus lines.
Q: Is the check result normal?
INPUT SIGNAL
ETACS-ECU
COMBINATION
METER
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
Rear Fog Lamp Indicator Lamp Circuit
REAR FOG LAMP
SWITCH
SYMPTOM PROCEDURES
SMART WIRING SYSTEM (SWS) USING SWS MONITOR
54C-373
YES :
Go to Step 3.
NO :
Repair the CAN bus line (Refer to GROUP
54D, Diagnosis
Step 3. Check for combination meter diagnosis
code.
Check whether the combination meter-related
diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Diagnose the combination meter (Refer to
GROUP 54A
− Troubleshooting
NO :
Go to Step 4.
Step 4. ECU check by using the SWS monitor
Check that the power supply and earth lines to the
ETACS-ECU and the SWS communication lines are
normal.
• Ignition switch: OFF
ECUS TO BE CHECKED
• ETACS ECU
OK: "OK" is displayed on the "ETACS ECU"
menu.
Q: Is the check result normal?
YES :
Go to Step 5.
NO :
Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible
Step 5. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the rear fog lamp indicator illuminates
(Refer to GROUP 54A
− Combination Meter
Q: Is the check result normal?
YES :
Replace the ETACS-ECU.
NO :
Replace the combination meter.
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