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