GDI ± Troubleshooting
13A-24
Code No.31 Detonation sensor system Probable cause
Range of check
D After 60 seconds have passed since the engine have started
Set conditions
D 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.
D Malfunction of the detonation sensor
D Open circuit or short-circuited harness wire of the
detonation sensor
D Malfunction of the engine-ECU
NG
Repair
NG
Replace the engine-ECU.
NG
Check the harness wire between the
detonation sensor and the earth, and
repair if necessary.
Check trouble symptom.
OK
Replace the detonation sensor.
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the detonation sensor.
Measure at the detonation sensor con-
nector A-81.
D Disconnect the connector, and
measure at the harness side.
D Continuity between 2 and earth
OK: Continuity
OK
Check the following connector:
C-19
NG
Repair
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