Mitsubishi Lancer Evolution 7. Manual — part 198
MPI -
Troubleshooting
13A-91
OK
OK
From the previous page
NG
Check the following connector: A-45
OK
Replace the engine-ECU.
OK
NG
OK
Check the harness between the
condenser fan relay (HI) and
engine-ECU.
D
Check for damage of the power
cable.
Repair
Repair
OK
Check and repair the harness
between the condenser fan relay
(HI) and engine-ECU.
D
Check for disconnection and
damage of the power cable.
NG
OK
Measure at the C-122 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Ignition switch: ON
D
Voltage between terminal No. 32
and earth
(Ignition switch: ON)
OK: System voltage
Measure at the A-45 condenser fan
motor connector.
D
Disconnect the connector to
measure at the harness side.
D
Disconnect the C-122
engine-ECU connector, and earth
the terminal No. 32.
D
Ignition switch: ON
D
Voltage between terminal No. 1
and earth
OK: System voltage
NG
Check the following connectors:
C-122, C-136 <R.H. drive vehicles>,
A-43 <L.H. drive vehicles>
Check and repair the harness
between the condenser fan relay
(HI) and engine-ECU.
D
Check for disconnection of the
power cable.
Replace the engine-ECU.
MPI -
Troubleshooting
13A-92
Inspection Procedure 26
A/C switch system
Probable cause
When the A/C switch on the control panel is turned ON, the A/C switch ON
signal is input to the engine-ECU. After receiving this signal, the engine-ECU
turns the A/C compressor ON.
D
Control panel A/C switch malfunction
D
A/C system malfunction
D
Engine-ECU malfunction
NG
Replace the engine-ECU.
Check the A/C system. (Refer to
GROUP 55 - Troubleshooting.)
NG
OK
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
MUT-II Data list
D
No. 28: A/C switch
D
Engine: Idling
D
A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max. Hot
D
A/C switch: ON
OK: ON
D
A/C switch: OFF
OK: OFF
OK
NG
OK
Check the following connector: C-122
Repair
Measure at the C-122 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Engine: Idling
D
A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max Hot
D
Voltage between terminal No. 45
and earth
D
A/C switch: ON
(A/C compressor driven state)
OK: System voltage
D
A/C switch: OFF
OK: 0.5 V or less
MPI -
Troubleshooting
13A-93
Inspection Procedure 27
A/C compressor relay system
Probable cause
When the A/C switch ON signal is input to the engine-ECU, the engine-ECU
turns the A/C compressor relay ON.
The A/C compressor magnetic clutch starts with this.
D
A/C compressor relay malfunction
D
A/C compressor magnetic clutch malfunction
D
Engine-ECU malfunction
OK
(2) NG
Check the following connector:
C-136 <R.H. drive vehicles>, A-43
<L.H. drive vehicles>
NG
Check and repair the harness
between the battery and A/C
compressor relay.
D
Check for disconnection and
short-circuit of the power cable.
OK
Check the A/C compressor relay. (Refer to 55 - On-vehicle
service.)
NG
Replace the A/C compressor relay.
Check the following connector: B-12X
NG
Repair
OK
OK
Measure at the B-12X A/C
compressor relay connector.
D
Remove the relay, and measure
at the connector side.
(1) Voltage between terminal No. 2
and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between terminal No. 1
and earth
OK: System voltage
(1) NG
Check the following connectors:
C-128 <R.H. drive vehicles>, C-130
<L.H. drive vehicles>, C-102, C-209,
C-210, C-201
NG
OK
Check and repair the harness
between the ignition switch and A/C
compressor relay.
D
Check for disconnection and
short-circuit of the power cable.
Repair
OK
NG
Measure at the A-47 A/C
compressor connector.
D
Measure the engine-ECU terminal
voltage.
D
Remove the B-12X A/C
compressor relay, and
short-circuit between the harness
connector’s terminal No. 1 and
terminal No. 4.
D
Ignition switch: ON
D
Voltage between terminal No. 1
and earth
OK: System voltage
To the next page
Repair
NG
OK
Check the following connector: A-47
Repair
OK
Check the following connector:
C-136 <R.H. drive vehicles>, A-43
<L.H. drive vehicles>
NG
Check and repair the harness
between the A/C compressor relay
and A/C compressor.
D
Check for disconnection and
short-circuit of the output cable.
Repair
MPI -
Troubleshooting
13A-94
OK
OK
Check the harness between the battery and A/C compressor
relay.
D
Check for damage of the power cable.
NG
Repair
OK
Check the following connector: C-136 <R.H. drive vehicles>,
A-43 <L.H. drive vehicles>
NG
Repair
NG
Replace the engine-ECU.
NG
Repair
OK
OK
MUT-II Data list
D
No. 49: A/C relay
D
Engine: Idling
D
A/C setting temperature
When room temperature is 25_
or more: Max Cool
When room temperature is 25_
or less: Max Hot
D
A/C switch: ON
OK: ON
D
A/C switch: OFF
OK: OFF
OK
OK
Measure at the C-126 engine-ECU
connector.
D
Measure the engine-ECU terminal
voltage.
D
Ignition switch: ON
D
Voltage between terminal No. 8
and earth
OK: System voltage
NG
Check the following connector: C-126
NG
OK
Check the harness between the A/C
compressor relay and engine-ECU.
D
Check for disconnection and
damage of the earth cable.
Repair
OK
Check the harness between the ignition switch and A/C
compressor relay.
D
Check for damage of the power cable.
NG
Check the following connectors: C-128 <R.H. drive vehicles>,
C-130 <L.H. drive vehicles>, C-102, C-209, C-210, C-201
Repair
From the previous page
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
Intermittent Malfunctions.)
Repair
NG
OK
Check the harness between the A/C compressor relay and
engine-ECU.
D
Check for damage of the earth cable.
NG
Repair
OK
Check the harness between the A/C compressor relay and
A/C compressor.
D
Check for damage of the output cable.
NG
Repair
Replace the A/C compressor magnetic clutch.
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