Mitsubishi Pajero Pinin 1999 Workshop Manual page 96

13A-24
Code No.31 Detonation sensor system
Range of check
After 60 seconds have passed since the engine have started
Set conditions
Amount of change in the sensor output voltage (detonation sensor peak
voltage for each half rotation of the crankshaft) is 0.06 V or less for 200
continuous times.
Measure at the detonation sensor con-
nector A-81.
Disconnect the connector, and
measure at the harness side.
Continuity between 2 and earth
OK: Continuity
NG
Check the harness wire between the
detonation sensor and the earth, and
repair if necessary.
GDI ±
Troubleshooting
OK
Check the following connector:
C-19
Check trouble symptom.
Probable cause
Malfunction of the detonation sensor
Open circuit or short-circuited harness wire of the
detonation sensor
Malfunction of the engine-ECU
NG
OK
NG
Repair
Check the harness wire between the
engine-ECU and the detonation sensor.
OK
NG
Repair
Replace the detonation sensor.
Check trouble symptom.
NG
Replace the engine-ECU.