Mitsubishi Lancer Evolution 7. Manual — part 189
MPI -
Troubleshooting
13A-55
Inspection Procedure 2
Only communication between MUT-II and engine-ECU is
not possible.
Probable cause
Causes shown on right are suspected.
D
Ignition switch malfunction
D
Engine control relay malfunction
D
Engine-ECU malfunction
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Check the harness between the
diagnosis connector and engine-ECU.
D
Check for disconnection,
short-circuit and damage of the
communication cable.
D
Check for disconnection,
short-circuit and damage of the
signal cable.
NG
Repair
OK
Check the following connectors:
C-26, C-130, C-118, C-108, C-28
<R.H. drive vehicles>, C-102 <L.H.
drive vehicles>, C-145 <Vehicles with
MMCS>
NG
Repair
Check the engine warning lamp.
D
Ignition switch: ON
OK: Engine warning lamp is
illuminated.
NG
Check the Inspection Procedure 22:
Engine-ECU power supply, engine
control relay, ignition switch-IG system.
NOTE
If the problem symptom does not disappear in the vehicle with MMCS after carrying out the above-mentioned
inspection procedure, there may be a malfunction in the multi-center display.
MPI -
Troubleshooting
13A-56
Inspection Procedure 3
Engine warning lamp does not illuminate immediately
after ignition switch is set to ON position.
Probable cause
The engine-ECU illuminates the engine warning lamp for 5 seconds immediately after
ignition switch is set to “ON” position to check whether the engine warning lamp bulb
is dead.
D
Engine warning lamp bulb dead
D
Ignition switch malfunction
D
Engine control relay malfunction
D
Engine-ECU malfunction
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note for Intermittent
Malfunctions.)
OK
Check the harness between the combination meter and engine-
ECU.
D
Check for damage of the output cable.
NG
Repair
OK
Check the following connector: C-130
NG
Repair
OK
Check the harness between the combination meter and ignition
switch.
D
Check for damage of the power cable.
NG
Repair
OK
Check the following connectors: C-213, C-210, C-201
NG
Repair
OK
Check and repair the harness between
the combination meter and engine-
ECU.
D
Check for disconnection and
short-circuit of the output cable.
OK
Measure at the C-122 engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 36
and earth
OK: System voltage
NG
Check the following connector:
C-130
NG
Repair
OK
Check the following connector:
C-122
NG
Repair
OK
Check and repair the harness between
the combination meter and ignition
switch.
D
Check for disconnection and
short-circuit of the power cable.
OK
Measure at the C-01 combination
meter connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 9 and
earth
OK: System voltage
NG
Check the following connectors:
C-213, C-210, C-201
NG
Repair
OK
Check the following connector:
C-01
NG
Repair
YES
Check whether engine warning lamp bulb is dead.
(Refer to GROUP 54 - Combination Meter.)
NG
Replace the engine warning lamp.
Can engine be started?
NO
Check the Inspection Procedure 22: Engine-ECU power supply,
engine control relay, ignition switch-IG system.
(Refer to P.13A-82.)
MPI -
Troubleshooting
13A-57
Inspection Procedure 4
Engine warning lamp stays illuminated and does not turn
OFF.
Probable cause
The engine-ECU illuminates the engine warning lamp when the occurrence of a
diagnosis code is recorded.
D
Engine-ECU malfunction
OK
Check and repair the harness between
the combination meter and engine-
ECU.
D
Check for short-circuit of the output
cable.
NG
Check the following connector:
C-130
NG
Repair
NG
Replace the engine-ECU.
OK
Measure at the C-122 Engine-ECU
connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ON
D
Voltage between terminal No. 36
and earth.
OK: System voltage
OK
Check the trouble symptoms.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
NO
Check the following connector:
C-122
NG
Repair
MUT-II Self-Diag code
D
Is a diagnosis code output?
YES
INSPECTION CHART FOR DIAGNO-
SIS CODE
(Refer to P.13A-12.)
MPI -
Troubleshooting
13A-58
Inspection Procedure 5
Starting disabled (Starter does not rotate.)
Probable cause
Causes shown on right are suspected.
D
Battery malfunction
D
Ignition switch malfunction
D
Starter malfunction
NG
Repair
OK
OK
NG
Repair
NG
OK
Check the harness between the igni-
tion switch and engine-ECU.
D
Check for disconnection,
short-circuit and damage of the
output cable.
OK
Replacetheignitionswitch.
OK
Check the ignition switch.
(Refer to GROUP 54 - Ignition Switch.)
MUT-II Data list
D
No. 18: Cranking signal
D
Ignition switch: ST
OK: ON
D
Ignition switch: ON
OK: OFF
NG
NG
Repair
Check the battery.
(Refer to GROUP 54 - Battery.)
NG
Replace the battery.
Check the following connector:
C-201
OK
OK
Repair
NG
OK
Check the following connector:
B-19
OK
Check and repair the harness between
the ignition switch and starter.
D
Check for disconnection of the
output cable.
Measure at the B-19 starter connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ST
D
Voltage between terminal No. 1 and
earth
OK: System voltage
NG
Repair
Check the following connectors:
C-129, C-115
Check the following connector:
B-14
Check and repair the harness between
the ignition switch and starter.
D
Check for short-circuit of the output
cable.
NG
Repair
OK
Check the following connectors:
B-14, B-19
OK
NG
Repair
Check the following connector:
B-18
NG
OK
Measure at the B-18 starter connector.
D
Disconnect the connector to
measure at the harness side.
D
Ignition switch: ST
D
Voltage between terminal No. 1 and
earth
OK: System voltage
NG
Check and repair the harness between
the battery and starter.
D
Check for disconnection and
short-circuit of the power cable.
NG
Repair
OK
Replace the starter.
Check the harness between the bat-
tery and starter.
D
Check for damage of the power
cable.
NG
Repair
Check the harness between the ignition
switch and starter.
D
Check for damage of the output
cable.
OK
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