1999 MITSUBISHI LANCER EVOLUTION VI voltage
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MPI – Troubleshooting13-42
INSPECTION PROCEDURE 31
Oxygen sensor system
Probable cause
When CO or HC concentration is too high, the malfunction of the parts shown at
right may be the cause.
The oxygen sensor detects the density of oxygen in exhaust gas and inputs it
to the engine-ECU after converting into a voltage signal.
The engine-ECU controls the fuel injection amount based on this signal such that
the stoichiometric air/fuel mixture ratio can be obtained.Malfunction of oxygen sensor
Improper connector contact, open or short-circuited
harness wire
Malfunction of engine-ECU
OK
Replace the engine-ECU.
Check the harness wire between
engine-ECU and oxygen sensor connector.NG
Repair
NG
OK
Check trouble symptom.
OK
Replace the engine-ECU.
NG
Check the harness wire between
engine-ECU and oxygen sensor connector.NG
Repair
OK
Check trouble symptom.
OK
Check the following connector: A-63NG
Repair
OK
Measure at the oxygen sensor connector A-63.
Disconnect the connector, and measure at the harness side.
Continuity between 2 and earth
OK:ContinuityNGCheck the following connector: B-62NG
Repair
Check the oxygen sensor. (Refer to P.13-32.)*NG
Replace
NOTE
*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
Page 155 of 558
MPI – Troubleshooting13-43
INSPECTION PROCEDURE 31
Oxygen sensor system
Probable cause
When CO or HC concentration is too high, the malfunction of the parts shown at
right may be the cause.
The oxygen sensor detects the density of oxygen in exhaust gas and inputs it
to the engine-ECU after converting into a voltage signal.
The engine-ECU controls the fuel injection amount based on this signal such that
the stoichiometric air/fuel mixture ratio can be obtained.Malfunction of oxygen sensor
Improper connector contact, open or short-circuited
harness wire
Malfunction of engine-ECU
OK
Replace the engine-ECU.
NG
Check the harness wire between oxygen sensor, engine-ECU,
and repair if necessary.
OK
Check trouble symptom.
NG
Check the harness wire between oxygen sensor and engine-ECU,
and repair if necessary.
OK
Check trouble symptom.
OK
Check trouble symptom.NGCheck the harness wire between
engine-ECU and oxygen sensor.NG
Repair
OK
Check the following connector: B-61NG
Repair
OK
NG
Measure at the engine-ECU connector B-61.
Disconnect the connector, and measure at the harness side.
Voltage between 60 and earth
(Ignition switch: ON)
OK:System voltageCheck the following connector: A-63NG
Repair 1. NG
Check the harness wire between oxygen sensor and control relay,
and repair if necessary.
OK
2. NG
Measure at the oxygen sensor connector A-63.
Disconnect the connector, and measure at the harness side.
1. Voltage between 1 and earth
(Ignition switch: ON)
OK:System voltage
2. Continuity between 2 and earth
OK:Continuity
Check the following connector: B-62NG
Repair
Check the oxygen sensor. (Refer to P.13-32)*NG
Replace
NOTE
*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
Page 156 of 558
MPI – Troubleshooting13-44
INSPECTION PROCEDURE 32
Ignition circuit system
Probable cause
The engine-ECU interrupts the ignition coil primary current by turning the power transistor
inside the engine-ECU ON and OFF.Malfunction of ignition switch.
Improper connector contact, open or short-circuited
harness wire
Malfunction of the engine-ECU
Measure at the ignition coil connectors A-110, A-111.
Disconnect the connector and measure at the harness side.
1. Voltage between 1 and earth (Ignition switch: ON)
OK:System voltage
2. Continuity between 2 and earth
OK:Continuity1. NGCheck the following
connectors: B-65, B-76NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between ignition coil and
ignition switch connector.NG
Repair
OK
Check the ignition switch. 2. NG
Check the harness wire between ignition coil connector and earth,
and repair if necessary.
OK
Check the following
connectors:
A-110, A-111NG
Repair
OK
Check trouble symptom.NGCheck ignition coil and power transistor unit system. (Refer to
P.13-16, INSPECTION PROCEDURE FOR DIAGNOSIS CODE
44.)
INSPECTION PROCEDURE 33
Idle speed control (ISC) servo (Stepper motor) system
Probable cause
The engine-ECU controls the intake air volume during idling by opening and closing
the servo valve located in the bypass air passage.Malfunction of ISC servo
Improper connector contact, open or short-circuited
harness wire
Malfunction of the engine-ECU
Check the ISC servo.NG
Replace
OK
Measure at the ISC servo connector A-18.
Disconnect the connector and measure at the harness side.
Voltage between 2 and earth, and 5 and earth (Ignition switch:
ON)
OK:System voltageNGCheck the harness wire between control relay and ISC servo con-
nector, and repair if necessary.
OK
Measure at the engine-ECU connector B-59.
Disconnect the connector, measure at the harness side.
Voltage between each of 4, 5, 17, 18 and earth (Ignition switch:
ON)
OK:System voltageNGCheck the following
connector: A-18NG
Repair
OK
Check trouble symptom.
NG
Check harness wire between engine-ECU and ISC servo connector,
and repair if necessary.
OK
Check the following
connector: B-59NG
Repair
OK
Check trouble symptom.NGReplace the engine-ECU.
Page 157 of 558
MPI – Troubleshooting13-45
INSPECTION PROCEDURE 34
Fuel pressure control valve system
Probable cause
The fuel pressure control valve switches the pressure introduction into the fuel pressure
regulator between the intake manifold and atmosphere.Malfunction of solenoid valve
Improper connector contact, open or short-circuited
harness wire
Malfunction of engine-ECU
NGReplace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59NG
Repair
OK
Measure at the engine-ECU connector B-59.
Disconnect the connector, and measure at the harness side.
Voltage between 3 and earth
(Ignition switch: ON)
OK:System voltageNGCheck the following connector: A-12NG
Repair NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Measure at the fuel pressure control valve connector A-12.
Disconnect the connector, and measure at the harness side.
Voltage between 1 and earth
(Ignition switch: ON)
OK:System voltage
Check the fuel pressure control valve.NG
Replace
INSPECTION PROCEDURE 35
Waste gate solenoid valve
Probable cause
The waste gate solenoid valve controls the boost pressure introduced into the waste
gate actuator in the turbocharger.Malfunction of solenoid valve
Improper connector contact, open or short-circuited
harness wire
Malfunction of engine-ECU
NGReplace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59NG
Repair
OK
Measure at the engine-ECU connector B-59.
Disconnect the connector, and measure at the harness side.
Voltage between 11 and earth
(Ignition switch: ON)
OK:System voltageNGCheck the following connector: A-23NG
Repair NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Measure at the waste gate solenoid valve connector A-23.
Disconnect the connector, and measure at the harness side.
Voltage between 2 and earth
(Ignition switch: ON)
OK:System voltage
Check the waste gate solenoid valve.
(Refer to Group 15 – On-vehicle service.)*NG
Replace
NOTE
*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
Page 158 of 558
MPI – Troubleshooting13-46
INSPECTION PROCEDURE 36
Secondary air control solenoid valve system
Probable cause
The secondary air control solenoid valve switches the pressure introduction into the
secondary air valve between the intake manifold and atmosphere.Malfunction of solenoid valve
Improper connector contact, open or short-circuited
harness wire
Malfunction of engine-ECU
NGReplace the engine-ECU.
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
NG
Check the harness wire between control relay and solenoid valve
connector, and repair if necessary.
OK
Check trouble symptom.
OK
Check the following connector: B-59NG
Repair
OK
Measure at the engine-ECU connector B-59.
Disconnect the connector, and measure at the harness side.
Voltage between 6 and earth
(Ignition switch: ON)
OK:System voltageNGCheck the following connectors:
A-127, A-88NG
Repair
OK
Measure at the secondary air control solenoid connector A-127.
Disconnect the connector, and measure at the harness side.
Voltage between 1 and earth
(Ignition switch: ON)
OK:System voltageNGCheck the following connector: A-88NG
Repair
Check the secondary air control solenoid valve.
(Refer to Group 15 – INTAKE AND EXHAUST.)*NG
Replace
NOTE
*: Refer to Workshop Manual for LANCER EVOLUTION-IV and EVOLUTION-V (Pub. No. S9806CNCP9).
Page 159 of 558
MPI – Troubleshooting13-47
INSPECTION PROCEDURE 37
MUT-II: Inspection of no initial combustion
MUT-II Data list
16 engine-ECU power supply voltage (Refer to P.13-57.)NGCheck the power supply and ignition switch-IG system.
(Refer to P.13-35, INSPECTION PROCEDURE 24.)
OK
Does the camshaft rotate at the engine cranking?
(When oil filler cap is removed.)NoCheck timing belt for breakage.
Ye s
MUT-II Self-Diag code
Are diagnosis codes displayed?Ye sRefer to P.13-8, INSPECTION CHART FOR DIAGNOSIS CODES.
No
MUT-II Data list
22 Crank angle sensor
OK:Cranking speed is displayed.NGCheck the crank angle sensor system.
(Refer to P.13-11, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 22.)
OK
MUT-II Actuator test
07 Fuel pump (Refer to P.13-61.)NGCheck the fuel pump system.
(Refer to P.13-36, INSPECTION PROCEDURE 25.)
OK
MUT-II Data list
21 Engine coolant temperature sensor (Refer to P.13-57.)NGCheck the engine coolant temperature sensor system.
(Refer to P.13-10, INSPECTION PROCEDURE FOR DIAGNOSIS
CODE 21.)
INSPECTION PROCEDURE 38
Ignition system: Inspection of no initial combustion.
OK
Check the ignition timing when cranking.
OK:Approx. 5BTDCNGCheck that the crank angle sensor and the timing belt cover are
installed properly.
NGCheck the ignition circuit system.
(Refer to P.13-44, INSPECTION PROCEDURE 32.)Check by connecting a timing light to the spark plug cable.
OK:Timing light flashes during cranking.
Page 165 of 558
MPI – Troubleshooting13-53
INSPECTION PROCEDURE 45
Check the engine-ECU power supply and earth circuit.
Measure at the engine-ECU connectors, B-59, B-60, B-62.
Disconnect the connector and measure at the harness side
1. Voltage between 82 and earth (Ignition switch: ON)
OK:System voltage
2. Voltage between 38 and earth
OK:System voltage
3. Voltage between 12, 25 and earth (Ignition switch: ON)
OK:System voltage (when the terminal 38 is earthed)
4. Continuity between 13, 26 and earth
OK:Continuity
5. Voltage between 80 and earth
OK:System voltage1. NGCheck the following
connectors: B-65, B-76NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between engine-ECU and
ignition switch connector.NG
Repair
OK
Check the ignition switch. (Refer to GROUP 54.)
2, 3. NG
4. NG
Check the harness wire between engine-ECU and earth, and repair
if necessary.
5. NG
OK
Check the following
connectors:
B-59, B-60, B-62NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Check the following connectors:
B-65, B-49, B-75, B-73NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between engine-ECU and battery, and
repair if necessary.
Check the harness wire between engine-ECU and control relay
connector, and repair if necessary.
INSPECTION PROCEDURE 46
Check fuel pump circuit.
Measure at the fuel pump connector D-18.
Disconnect the connector and measure at the harness side.
Continuity between 1 and earth
OK:ContinuityNGCheck the following connector:
D-04NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between fuel pump and earth, and repair
if necessary.
OK
Check the following connectors: D-04, B-64NG
Repair OKCheck trouble symptom.
NG
Check the harness wire between terminal for fuel pump drive and
fuel pump connector.NG
Repair
OK
Replace the fuel pump.
Page 166 of 558
MPI – Troubleshooting13-54
INSPECTION PROCEDURE 46
Check fuel pump circuit.
Measure at the fuel pump relay connector D-18.
Disconnect the connector and measure at the harness side.
Continuity between 1 and earth
OK:ContinuityNGCheck the following connector:
D-04NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between fuel pump and earth, and repair
if necessary.
OK
Check the following connectors: A-123, B-64, D-18, D-32NG
Repair OKCheck trouble symptom.
NG
Check the harness wire between fuel pump and fuel pump relay
No.2 connector.NG
Repair
OK
Replace the fuel pump.
INSPECTION PROCEDURE 47
Check the fuel pump drive control circuit.
NG
Check the harness wire between the fuel pump relay and engine-
ECU connector.
OK
Check trouble symptom.
OK
Check trouble symptom.
NG
Check the harness wire
between fuel pump relay
and ignition switch con-
nector.NG
Repair
OK
Check the ignition switch. (Refer to GROUP 54.)OK
Check trouble symptom.
NG
Replace the engine-ECU.
NG
Repair
OK
Check the following connector: B-59
OK
Measure at the engine-ECU connector B-59.
Disconnect the connector and measure at the harness side.
Voltage between 8 and earth (Ignition switch: ON)
OK:System voltageNG
Measure at the fuel pump relay connector B-28.
Disconnect the connector and measure at the harness side.
Voltage between 3, 4 and earth (Ignition switch: ON)
OK:System voltageNGCheck the following
connectors: B-65, B-76NG
Repair
Check the following
connector: B-28NG
Repair