Mitsubishi Lancer Evolution 7. Manual - part 196

 

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Mitsubishi Lancer Evolution 7. Manual - part 196

 

 

MPI -

Troubleshooting

13A-83

OK

Check and repair the harness and

connector of the ignition switch-IG1

output signal for short-circuit.

NG

OK

Check the harness between the

ignition switch and engine-ECU.
D

Check for disconnection and

short-circuit of the output cable.

Repair

OK

OK

NG

Check the ignition switch. (Refer to

GROUP 54 - Ignition switch.)

Repair

Measure at the C-115 engine-ECU

connector.
D

Measure the engine-ECU terminal

voltage.

D

Ignition switch: ON

D

Voltage between terminal No. 82

and earth

OK: System voltage

NG

Check the following connector:

C-115

NG

Replace the ignition switch.

OK

From the previous page

OK

NG

Check the following connector:

C-126

Repair

OK

NG

Repair

Check the following connectors:

C-129, C-209, C-210, C-201

Check and repair the harness

between the engine control relay and

engine-ECU.
D

Check for disconnection and

short-circuit of the earth cable.

OK

Repair

(1) NG

Check the following connectors:

C-122, B-11X

NG

OK

NG

Replace the engine-ECU.

OK

NG

Check the harness between the

ignition switch and engine-ECU.
D

Check for damage of the output

cable.

Repair

(2) NG

Check the following connectors:

C-122, C-115, C-129, C-209, C-210,

C-201

NG

Intermittent malfunction (Refer to

GROUP 00 - Points to Note for

Intermittent Malfunctions.)

OK

OK

Repair

Check the trouble symptoms.

OK

To the next page

Measure at the C-122 engine-ECU

connector.
D

Measure the engine-ECU terminal

voltage.

(1) Voltage between terminal No. 38

and earth

(Ignition switch: OFF)

OK: System voltage

(2) Voltage between terminal No. 38

and earth

(Ignition switch: ON)

OK: 1 V or less

MPI -

Troubleshooting

13A-84

Check the harness and connector of the engine control relay

output power for short-circuit.

NG

NG

OK

Check the harness between the engine control relay and

engine-ECU.
D

Check for disconnection, short-circuit and damage of the

output cable.

NG

OK

Check the following connector: C-126

NG

Intermittent malfunction (Refer to GROUP 00 - Points to Note

for Intermittent Malfunctions.)

From the previous page

Repair

OK

Repair

Repair

OK

OK

Check the following connector: A-13

NG

Repair

Check the harness between the battery and engine control

relay.
D

Check for damage of the power cable.

NG

OK

Repair

Check the harness between the engine control relay and

engine-ECU.
D

Check for damage of the output cable.

NG

OK

Repair

OK

Check the trouble symptoms.

Replace the engine-ECU.

MPI -

Troubleshooting

13A-85

Inspection Procedure 23

Fuel pump system

Probable cause

D

The engine-ECU turns the fuel pump relay ON during cranking and engine

operation, and supplies the drive power to the fuel pump.

D

When operating with a low load, the engine-ECU supplies power to the fuel

pump via the resistor. When operating with a high load, power is directly

supplied and the fuel pump fuel discharge amount is increased.

D

Fuel pump relay 1 malfunction

D

Fuel pump relay 2 malfunction

D

Fuel pump relay 3 malfunction

D

Fuel pump resistor malfunction

D

Fuel pump malfunction

D

Fuel pump circuit disconnection, short-circuit, or

connector contact defect

D

Engine-ECU malfunction

NG

Intermittent malfunction (Refer to

GROUP 00 - Points to Note for

Intermittent Malfunctions.)

OK

MUT-II Actuator Test

No. 07: Fuel pump

(Refer to P.13A-107.)

NG

MUT-II Actuator Test

No. 13: Fuel pump relay 3

(Refer to P.13A-107.)

OK

NG

Replace the fuel pump relay 3.

NG

NG

Repair

Check the fuel pump relay 1, fuel

pump relay 2 and fuel pump registor.

(Refer to P.13A-132.)

OK

Measure at the B-140 fuel pump

relay 3.
D

Disconnect the connector to

measure at the harness side.

D

Voltage between terminal No. 2,

terminal No. 4 and earth

(Ignition switch: ON)

OK: System voltage

NG

OK

Check the fuel pump relay 3.

(Refer to P.13A-132.)

OK

Check and repair the harness

between the fuel pump resistor and

fuel pump relay 3.

OK

NG

Repair

OK

NG

Check the trouble symptoms.

Repair

OK

Check the harness between the fuel

pump relay 3 and fuel pump resistor.

Replace the engine-ECU.

Check and repair the harness

between the fuel pump relay 3 and

engine-ECU.

Check the following connector: C-122

Measure at the C-122 engine-ECU

connector.
D

Disconnect the connector to

measure at the harness side.

D

Disconnect the C-126

engine-ECU connector, and earth

the terminal No. 22.

D

Voltage between terminal No. 126

and earth

(Ignition switch: ON)

OK: System voltage

NG

OK

Check the following connectors:

C-209, C-135

(1) NG

Repair

NG

NG

Check the trouble symptoms.

Check and repair the harness

between the fuel pump relay 1 and

battery.

(2) NG

NG

OK

Check the following connector:

C-210

Repair

NG

Check the trouble symptoms.

OK

Check the following connectors:

C-223, C-08 <R.H. drive vehicle>,

C-102 <L.H. drive vehicle>

(3) NG

NG

Repair

NG

Check and repair the harness

between the fuel pump relay 1 and

body earth.

Check the trouble symptoms.

OK

To the next page

Measure at the C-223 fuel pump

relay 1.
D

Disconnect the connector to

measure at the harness side.

(1) Voltage between terminal No. 3

and earth

OK: System voltage

(2) Voltage between terminal No. 1

and earth

(Ignition switch: ON)

OK: Battery voltage

(2) Resistance between terminal No.

4 and earth

OK: 2 Ω or less

Repair

OK

Check the ignition switch. (Refer to

GROUP 54 - Ignition Switch.)

Check the harness between the fuel

pump relay 1 and ignition switch.

NG

MPI -

Troubleshooting

13A-86

OK

From the previous page

Check and repair the harness

between the fuel pump relay 1 and

fuel pump relay 2.

OK

NG

Measure at the C-221 fuel pump

relay 2 connector.
D

Disconnect the connector to

measure at the harness side.

(1) Voltage between terminal No. 1,

terminal No. 2 and earth

(Ignition switch: ON)

OK: System voltage

Check and repair the harness

between the fuel pump relay 2 and

engine-ECU.

OK

Check the following connector: C-129

OK

Repair

OK

Measure at the C-126 engine-ECU

connector.
D

Disconnect the connector to

measure at the harness side.

D

Voltage between terminal No. 22

and earth

(Ignition switch: ON)

OK: System voltage

NG

OK

Check the following connector: C-126

Repair

NG

Measure at the C-126 engine-ECU

connector.
D

Disconnect the connector to

measure at the harness side.

D

Short-circuit between terminal No.

22 and earth

(Ignition switch: ON)

OK: The fuel pump operates.

(Operation sounds are

heard.)

OK

NG

Check the trouble symptoms.

Replace the engine-ECU.

Check and repair the harness

between the fuel pump relay 2 and

fuel pump resistor.

OK

Check the following connector: C-129

Repair

OK

Measure at the B-141 fuel pump

resistor connector.
D

Disconnect the connector to

measure at the harness side.

D

Voltage between terminal No. 1

and earth

(Ignition switch: ON)

OK: System voltage

NG

NG

NG

(1) NG

OK

NG

OK

Check the following connectors:

D-29, C-146, C-129, B-141

Repair

NG

Check the trouble symptoms.

Check and repair the harness

between the fuel pump resistor and

fuel pump.

NG

(2) NG

NG

Measure at the D-09 fuel pump

connector.
D

Disconnect the connector to

measure at the harness side.

(1) Voltage between terminal No. 5

and earth

(Ignition switch: ON)

OK: System voltage

(2) Resistance between terminal No.

4 and earth

OK: 2 Ω or less

OK

NG

Check the trouble symptoms.

Check and repair the harness

between the fuel pump and body

earth.

Check the following connector: D-30

Repair

OK

Check the following connector: D-09

NG

Replace the fuel pump.

Check the trouble symptoms.

Repair

 

 

 

 

 

 

 

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