Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 86

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-79.
D Disconnect the connector
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.
D Actuator test by MUT-II is not carried out.
Set conditions
D Surge voltage of injector coil is not detected for 4 seconds.
Check the injector. (Refer to P.13D-89.)
OK
Measure at the injector connectors
A-02, A-03, A-04, A-05.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 1 and earth
(Ignition switch: ON)
OK: System voltage
OK
Measure at the engine-ECU connector B-54 <M/T> or the
engine-A/T-ECU connector B-113 <A/T>.
D Disconnect the connector and measure at the harness side.
D Voltage between <M/T> 1, 2, 14, 15 <A/T> 1, 2, 9, 24 and
earth (Ignition switch: ON)
OK: System voltage
Check the following connector: B-54 <M/T>, B-113 <A/T>
Check trouble symptom.
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
MPI - MPI -
OK
Check the following connectors:
A-79, B-51 <M/T>, B-111 <A/T>
and
Check trouble symptom.
Check the harness wire between the
engine-ECU <M/T> or engine-A/T-ECU
<A/T> and the detonation sensor con-
nector.
NG
Replace
NG
Check the following connectors:
A-02, A-03, A-04, A-05
Check trouble symptom.
OK
OK
NG
Troubleshooting Troubleshooting
Probable cause
D Malfunction of the detonation sensor
D Improper
short-circuited harness wire of the detonation sensor
circuit
D Malfunction
engine-A/T-ECU <A/T>
NG
OK
NG
OK
NG
Repair
Probable cause
D Malfunction of the injector
D Improper
short-circuited harness wire of the injector circuit
D Malfunction
engine-A/T-ECU <A/T>
NG
OK
NG
NG
Check the following
connectors: A-02, A-03,
A-04, A-05
OK
Check trouble symptom.
NG
Check the harness between engine-ECU <M/T> or engine-A/T-ECU
<A/T> and injector connector, and repair if necessary.
NG
Repair
13D-21
connector contact, open circuit
of the engine-ECU <M/T>
Repair
Replace the detonation sensor.
Check trouble symptom.
NG
Replace the engine-ECU <M/T> or en-
gine-A/T-ECU <A/T>.
connector contact, open circuit
of the engine-ECU <M/T>
Repair
Check the harness wire between the
control relay and the injector connector,
and repair if necessary.
NG
Repair
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