Mitsubishi Lancer Evolution VI. Manual - part 31

 

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Mitsubishi Lancer Evolution VI. Manual - part 31

 

 

MPI  – 

Troubleshooting

13-12

Code No. 23 Camshaft position sensor system

Probable cause

Range of Check

D

Ignition switch: ON

D

Engine speed is approx. 50 r/min or more.

Set conditions

D

Sensor output voltage does not change for 4 seconds (no pulse signal input.)

D

Malfunction of the camshaft position sensor

D

Improper connector contact, open or short-circuited
harness wire of the camshaft position sensor circuit

D

Malfunction of the engine-ECU

Measure at the camshaft position sensor connector A-97.

D

Connect the connector.

D

Voltage between 2 and earth (Engine: cranking)
OK: 0.4– 3.0 V

D

Voltage between 2 and earth (Engine: idling)
OK: 0.5– 2.0 V

OK

Replace the engine-ECU.

NG

Measure at the camshaft position sensor connector A-97.

D

Disconnect the connector, and measure at the harness side.

1. Voltage between 3 and earth (Ignition switch: ON)

OK: System voltage

2. Voltage between 2 and earth (Ignition switch: ON)

OK: 4.8– 5.2 V

3. Continuity between 1 and earth

OK: Continuity

1. NG

Check the harness wire between the camshaft position sensor
and the control relay connector, and repair if necessary.

2. NG

Check the following con-
nector:
 B-62

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire
between the engine-ECU
and the camshaft position
sensor connector.

NG

Repair

OK

Replace the engine-ECU.

3. NG

Check the harness wire between the camshaft position sensor
and the earth, and repair if necessary.

OK

Check the following con-
nector:
 A-97

NG

Repair

OK

Check trouble symptom.

NG

Replace the camshaft position sensor.

MPI  – 

Troubleshooting

13-13

Code No. 24 Vehicles speed sensor system

Probable cause

Range of check

D

Ignition switch: ON

D

Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.

D

Idle position switch: OFF

D

Engine speed is 3,000 r/min or more.

D

Driving under high engine load conditions.

Set conditions

D

Sensor output voltage does not change for 4 seconds (no pulse signal input).

D

Malfunction of the vehicle speed sensor

D

Improper connector contact, open or short-circuited
harness wire of the vehicle speed sensor circuit

D

Malfunction of the engine-ECU

OK

Check the ignition switch. (Refer to GROUP 54 – Ignition Switch.)

2. NG

OK

Replace the engine-ECU.

3. NG

OK

Replace the engine-ECU.

NG

Check the harness wire
between the engine-ECU
and the vehicle speed
sensor connector.

NG

Repair

OK

Check trouble symptom.

OK

Check the following
connectors:
A-19, B-62

NG

Repair

NG

Check the harness wire
between the engine-ECU
and the vehicle speed
sensor connector.

NG

Repair

OK

Check trouble symptom.

Check the following
connector: 
B-62

NG

Repair

NG

Check the harness wire
between the vehicle
speed sensor and ignition
switch connector.

NG

Repair

OK

Check trouble symptom.

OK

Measure at the vehicle speed sensor connector A-19.

D

Disconnect the connector, and measure at the harness
side.

1. Voltage between 1 and earth (Ignition switch: ON)

OK: System voltage

2. Voltage between 3 and earth (Ignition switch: ON)

OK: 4.8  – 5.2 V

3. Continuity between 2 and earth

OK: Continuity

1. NG

Check the following
connectors:
B-64, B-74, B-76

NG

Repair

Check the vehicle speed sensor. (Refer to GROUP 54 – Combina-
tion Meters.)

NG

Replace

Check the harness wire between the vehicle speed sensor and
the earth, and repair if necessary.

MPI  – 

Troubleshooting

13-14

Code No. 25 Barometric pressure sensor system

Probable cause

Range of Check

D

Ignition switch: ON

D

Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.

Set conditions

D

Sensor output voltage is 4.5 V or more (corresponding to a barometric pressure
of 114 kPa or more) for 4 seconds.

or

D

Sensor output voltage is 0.2 V or less (corresponding to a barometric pressure
of 5.33 kPa or less) for 4 seconds.

D

Malfunction of the barometric pressure sensor

D

Improper connector contact, open or short-circuited
harness wire of the barometric pressure sensor circuit

D

Malfunction of the engine-ECU

Measure at the air flow sensor con-
nector A-25.

D

Connect the connector. (Use
the test harness: MB991709)

D

Voltage between 2 and earth
(Ignition switch: ON)
OK: 3.7– 4.3 V (Altitude: 0 m)

3.2– 3.8V (Altitude:
1,200 m)

NG

Measure at the air flow sensor con-
nector A-25.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8– 5.2 V

D

Continuity between 5 and earth
OK: Continuity

NG

Check the following connector:
B-62

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between
the engine-ECU and the baromet-
ric pressure sensor connector.

NG

Repair

OK

Replace the engine-ECU.

OK

Check the following connector:
A-25

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between
the engine-ECU and the baromet-
ric pressure sensor connector.

NG

Repair

OK

Replace the air flow sensor.

OK

Measure at the engine-ECU con-
nector B-62.

D

Connect the connector.

D

Voltage between 85 and earth
(Ignition switch: ON)
OK: 3.7– 4.3 V (Altitude: 0 m)

3.2– 3.8V (Altitude:
1,200 m)

NG

Check the harness wire between
the engine-ECU and the baromet-
ric pressure sensor connector, and
repair if necessary.

Check the following connector:
A-25, B-62

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Repair

OK

MPI  – 

Troubleshooting

13-15

Code No. 31 Detonation sensor system

Probable cause

Range of Check

D

Ignition switch: ON

D

Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.

D

Engine speed is approx. 5,000 r/min or more

D

Set conditions

D

The change in the detonation sensor output voltage (detonation sensor peak voltage
at each 1/2 revolution of the crankshaft) is less than 0.06 V for 200 times in
succession.

D

Malfunction of the detonation sensor

D

Improper connector contact, open or short-circuited
harness wire of the detonation sensor circuit

D

Malfunction of the engine-ECU

Measure at the detonation sensor con-
nector A-96.

D

Disconnect the connector and
measure at the harness side.

D

Continuity between 2 and earth
OK: Continuity

OK

Check the following connector:
B-62

NG

Repair

OK

Check trouble symptom.

NG

Check the harness wire between the
engine-ECU and the detonation sensor
connector.

OK

Replace the detonation sensor.

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Repair

NG

Check the harness wire between the
detonation sensor and earth, and repair
if necessary.

Code No. 41 Injector system

Probable cause

Range of Check

D

Engine speed is approx. 50 – 1,000 r/min

D

The throttle position sensor output voltage is 1.15 V or less.

D

Actuator test by MUT-

II

 is not carried out.

Set conditions

D

Surge voltage of injector coil is not detected for 4 seconds.

D

Malfunction of the injector

D

Improper connector contact, open or short-circuited
harness wire of the injector circuit

D

Malfunction of the engine-ECU

OK

Check trouble symptom.

NG

Check the harness wire between the
resistor and the injector connector, and
repair if necessary.

Check the injector control circuit. 
(Refer to P.13-55, INSPECTION PRO-
CEDURE 50.)

OK

OK

Measure at the injector connectors
A-53, A-54, A-55, A-56

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the following connector:
A-125

NG

Repair

OK

Measure at the resistor connector
A-125.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 3 and earth
(Ignition switch: ON)
OK: System voltage

NG

Check the harness wire between the
control relay and the resistor connector,
and repair if necessary.

Check the injector. (Refer to P.13-34.)*
Check the resistor. (Refer to P.13-34.)*

NG

Replace

NOTE
*:

Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).

 

 

 

 

 

 

 

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