Mitsubishi L200. Manual — part 184
TROUBLESHOOTING
DIESEL FUEL
13A-532
Inspection Procedure 28: Rear Window Defogger System <Euro5>
OPERATION
• The battery voltage is applied to the engine-ECU
(terminal No. 10) from the rear window defogger
relay.
FUNCTION
• When the rear window defogger is turned ON and
the battery voltage is applied to the engine-ECU,
the engine-ECU increases the idle speed.
PROBABLE CAUSES
• Failed rear window defogger system
• Open/short circuit or harness damage in rear win-
dow defogger relay circuit or loose connector
contact
• Failed engine-ECU
AKB00332
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C-105
Rear window
defogger relay
10
10
*2
*1
11
J/C (8)
C-08
J/B
L-O
L-O
10
19
7.5A
C-208
L-O
B-G
Rear Window Defogger Circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V: Violet PU: Purple SI: Silver
Engine-ECU
AB
19
C-53*¹ or
C-35*²
NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
TROUBLESHOOTING
DIESEL FUEL
13A-533
DIAGNOSIS PROCEDURE
STEP 1. Check the rear window defogger.
The rear defogger system should work normally
(Refer to GROUP 54A, Printed Heater Lines Check ).
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Check rear window defogger relay system
(Refer to GROUP 55A
− Troubleshooting −
Check Chart for Trouble Symptoms
<Manual A/C>, GROUP 55B
−
Troubleshooting
− Check Chart for Trouble
Symptoms <Automatic A/C>).
STEP 2. Connector check: C-105 engine-ECU
connector.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace the connector.
STEP 3. Perform voltage measurement at C-105
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling
• Voltage between terminal No. 10 and earth.
OK:
System voltage (when rear window defogger
is ON)
1 V or less (when rear window defogger is
OFF)
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 4 .
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
TROUBLESHOOTING
DIESEL FUEL
13A-534
STEP 4. Connector check: C-208 junction block
connector.
Q: Is the check result normal?
YES :
NO :
Repair or replace the connector.
STEP 5. Check harness between C-208 (terminal
No. 10) junction block connector and C-105
(terminal No. 10) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector C-53 <L. H. drive vehicles>, C-08 <R. H.
drive vehicles> and C-35 <R. H. drive vehicles>, and
repair if necessary.
• Check output line for open/short circuit.
Q: Is the check result normal?
AKB00333
Connector: C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block (Front view)
C-208
C-208
Harness side
connector
Junction block
(Front view)
AB
AKB00333
Connector: C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block (Front view)
C-208
C-208
Harness side
connector
Junction block
(Front view)
AB
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
TROUBLESHOOTING
DIESEL FUEL
13A-535
YES :
Replace the engine-ECU.
NO :
Repair the damaged harness wire.
STEP 6. Connector check: C-208 junction block
connector.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair or replace the connector.
STEP 7. Check harness between C-208 (terminal
No. 10) junction block connector and C-105
(terminal No. 10) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector C-53 <L. H. drive vehicles>, C-08 <R. H.
drive vehicles> and C-35 <R. H. drive vehicles>, and
repair if necessary.
• Check output line for damage.
Q: Is the check result normal?
AKB00333
Connector: C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block (Front view)
C-208
C-208
Harness side
connector
Junction block
(Front view)
AB
AKB00333
Connector: C-208
<L. H. drive vehicles>
<R. H. drive vehicles>
Junction block (Front view)
C-208
C-208
Harness side
connector
Junction block
(Front view)
AB
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
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