OPERATION
- The sensor signal is inputted to the engine-A/T-ECU (terminal No. 90) from the detonation sensor (terminal No. 1).
FUNCTION
- The detonation sensor detects the vibration of the cylinder block caused by detonation waves, and inputs a signal to the engine-A/T-ECU.
- In response to the signal, the engine-A/T-ECU provides controls to retard the ignition timing when the detonation occurs.
TROUBLE JUDGMENT
Check Condition
- After the ignition switch has been in the "ON" position, or 2 seconds later after the engine has started up.
- Engine speed of 2,000 r/min or more <DOHC>.
- Volumetric efficiency of 30 % or more <DOHC>.
Judgment Criterion
- The change amount of the detonation sensor output voltage (the detonation sensor peak voltage in every half a turn of the crankshaft) is below 0.06 V or less in 200 consecutive times.
PROBABLE CAUSE
- Failed detonation sensor
- Open/short circuit in detonation sensor circuit or loose connector contact
- Failed engine-A/T-ECU
)
)
Q: Is the check result normal?
YES:
Go to Step 2 
.NO: Repair.
- Disconnect connector, and measure at harness side.
- Resistance between terminal No. 2 and earth.
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 3 .NO:
- Check and repair harness between B-103 (terminal No. 2) detonation sensor connector and body earth.
- Check earthing line for open circuit and damage.
)
Q: Is the check result normal?
YES:
Go to Step 4 .NO: Repair.
- Check output line for open or short circuit and damage.
Q: Is the check result normal?
YES:
Go to Step 5 .NO: Repair.
