Mitsubishi Lancer Evolution VI. Manual - part 30

MPI  – 

Troubleshooting

13-8

3. INSPECTION CHART FOR DIAGNOSIS CODES

Code No.

Diagnosis item

Reference page

12

Air flow sensor system

13-8

13

Intake air temperature sensor system

13-9

14

Throttle position sensor system

13-9

21

Engine coolant temperature sensor system

13-10

22

Crank angle sensor system

13-11

23

Camshaft position sensor system

13-12

24

Vehicle speed sensor system

13-13

25

Barometric pressure sensor system

13-14

31

Detonation sensor system

13-15

41

Injector system

13-15

44

Ignition coil and power transistor unit system

13-16

64

Alternator FR terminal system

13-17

INSPECTION PROCEDURE FOR DIAGNOSIS CODES

Code No. 12 Air flow sensor system

Probable cause

Range of Check

D

Engine speed is 500 r/min or more.

Set conditions

D

Sensor output frequency is 3 Hz or less for 4 seconds.

D

Malfunction of the air flow sensor

D

Improper connector contact, open or short-circuited
harness wire of the air flow sensor

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)

1. Voltage between 3 and earth

(Engine: Idling)
OK: 2.2– 3.2 V

2. Voltage between 7 and earth

OK: 0 – 1 V (Engine: idling)

6 – 9 V (2,000 r/min)

OK

Replace the engine-ECU.

1. NG

Check the air flow sensor circuit.
(Refer to P.13-55, INSPECTION
PROCEDURE 48.)

2. NG

Measure at the engine-ECU con-
nector B-59.

D

Connect the connector.

D

Voltage between 19 and earth
(Ignition switch: ON)
OK: 6 – 9 V

OK

Check the following connector:
B-59

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Check the following connector:
A-25

NG

Repair

OK

Check trouble symptom.

NG

NG

Repair

Replace the air flow sensor.

MPI  – 

Troubleshooting

13-9

Code No. 13 Intake air temperature 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 4.6 V or more (corresponding to an intake air temperature
of  –45

_

C or less) for 4 seconds.

or

D

Sensor output voltage is 0.2V or less (corresponding to an intake air temperature
of 125

_

C or more) for 4 seconds.

D

Malfunction of the intake air temperature sensor

D

Improper connector contact, open or short-circuited
harness wire of the intake air temperature sensor circuit

D

Malfunction of the engine-ECU

Check the intake air temperature
sensor. (Refer to P.13-32.)*

NG

OK

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

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 6 and earth
(Ignition switch: ON)
OK: 4.5– 4.9 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 intake air
temperature sensor connector.

NG

Repair

OK

Replace the engine-ECU.

OK

Check the following connector:
A-25

NG

Repair

OK

Check trouble symptom.

NG

Replace the engine-ECU.

Replace the air flow sensor.

NOTE
*:

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

Code No. 14 Throttle position 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

The sensor output voltage is 0.2 V or less for 4 seconds.

D

Malfunction of the throttle position sensor

D

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

D

Improper  “ON” state of idle position switch

D

Short circuit of the idle position switch signal line

D

Malfunction of the engine-ECU

MUT-

II

 Data list

26 Idle position switch system

OK: With the throttle valve at the

idle position: ON
With the throttle valve slight-
ly open: OFF

NG

Check the idle position switch system.
(Refer to P.13-38, INSPECTION PRO-
CEDURE 26.)

OK

Check the throttle position sensor.

NG

Replace

OK

Measure at the throttle position sensor
connector A-16.

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 4 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 throttle position
sensor connector.

NG

Repair

OK

Replace the engine-ECU.

OK

Check the throttle position sensor out-
put circuit. (Refer to P.13-55, INSPEC-
TION PROCEDURE 49.)

MPI  – 

Troubleshooting

13-10

Code No. 21 Engine coolant temperature 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 4.6 V or more (corresponding to an engine coolant
temperature of –45

_

C or less) for 4 seconds.

or

D

Sensor output voltage is 0.1 V or less (corresponding to an engine coolant
temperature of 140

_

C or more) for 4 seconds.

D

Malfunction of the engine coolant temperature sensor

D

Improper connector contact, open or short-circuited
harness wire of the engine coolant temperature sensor
circuit

D

Malfunction of the engine-ECU

Range of Check

D

Ignition switch: ON

D

Engine speed is approx. 50 r/min or more

Set conditions

D

The sensor output voltage increases from 1.6 V or less (corresponding to an
engine coolant temperature of 40

_

C or more) to 1.6 V or more (corresponding

to an engine coolant temperature of 40

_

C or less).

D

After this, the sensor output voltage is 1.6 V or more for 5 minutes.

Check the engine coolant temperature
sensor. (Refer to P.13-32.)*

NG

Replace

OK

Measure at the engine coolant temper-
ature sensor connector A-38.

D

Disconnect the connector, and
measure at the harness side.

D

Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.5– 4.9 V

D

Continuity between 2 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 engine coolant
temperature sensor connector.

NG

Repair

OK

Replace the engine-ECU.

Check the following connector:
A-38

OK

Check trouble symptom.

NG

Replace the engine-ECU.

NG

Repair

OK

NOTE
*:

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

MPI  – 

Troubleshooting

13-11

Code No. 22 Crank angle sensor system

Probable cause

Range of Check

D

Engine is cranking.

Set conditions

D

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

D

Malfunction of the crank angle sensor

D

Improper connector contact, open or short-circuited
harness wire of the crank angle sensor

D

Malfunction of the engine-ECU

Measure at the crank angle sensor connector A-51.

D

Connect the connector. (Use the test harness: MD998478.)

D

Voltage between 2 (black clip) and earth (Engine: cranking)
OK: 0.4– 4.0 V

D

Voltage between 2 (black clip) and earth (Engine: idling)
OK: 1.5– 2.5 V

NG

OK

Replace the engine-ECU.

Measure at the crank angle sensor connector A-51.

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

OK

Check the following con-
nector: A-51

NG

Repair

OK

Check trouble symptom.

NG

Replace the crank angle sensor.

1. NG

Check the harness wire between the crank angle sensor and the
control relay connector, and repair if necessary.

2. NG

Check the following con-
nector: B-62

NG

Repair

OK

3. NG

Check trouble symptom.

NG

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

NG

Repair

OK

Replace the engine-ECU.

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