Mitsubishi Lancer Evolution-IV Workshop Manual page 55

13-14
Code No.31 Detonation sensor system
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
Set conditions
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.
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
NG
Check the harness wire between the
detonation sensor and earth, and repair
if necessary.
Code No. 41 Injector system
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.
Set conditions
D Surge voltage of injector coil is not detected for 4 seconds.
Check the injector. (Refer to P.13-34.)
Check the resistor. (Refer to P.13-34.)
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
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
OK
Check the injector control circuit.
MPI –
Troubleshooting
OK
Check the following connector:
B-62
Check trouble symptom.
Check the harness wire between the
engine-ECU and the detonation sensor
connector.
Repair
NG
Replace
NG
Check the harness wire between the
control relay and the resistor connec-
tor, and repair if necessary.
NG
Check the following connector:
A-125
Check trouble symptom.
Check the harness wire between the
resistor and the injector connector, and
repair if necessary.
Probable cause
D Malfunction of the detonation sensor
D Improper
short-circuited harness wire of the detonation sensor
circuit
D Malfunction of the engine-ECU
NG
OK
NG
OK
NG
Probable cause
D Malfunction of the injector
D Improper
short-circuited harness wire of the injector circuit
D Malfunction of the engine-ECU
NG
Repair
OK
NG
connector contact, open
Repair
Replace the detonation sensor.
Check trouble symptom.
NG
Replace the engine-ECU.
connector contact, open
circuit or
circuit or