2018 / ECLIPSE CROSS / EC - Workshop Manual
13 -FUEL > 13A-DIRECT INJECTION AND MULTIPOINT FUEL INJECTION (DI AND MPI) > TROUBLESHOOTING > DIAGNOSIS CODE PROCEDURES > CODE NO. P0327 DETONATION SENSOR CIRCUIT LOW INPUT
Code No. P0327: Detonation Sensor Circuit Low Input
OPERATION
- The sensor signal is input to the engine-ECU connector terminal K/S from the detonation sensor.
- The power voltage is earthed to the engine-ECU connector terminal K/SE from the detonation sensor.
FUNCTION
- The detonation sensor detects the vibration of the cylinder block caused by detonation waves, and inputs a signal to the engine-ECU.
- In response to the signal, the engine-ECU provides controls to retard the ignition timing when the detonation occurs.
TROUBLE JUDGEMENT
Check Condition
- More than 2 seconds have passed since the engine starting sequence was completed.
Judgement Criterion
- Detonation sensor output voltage is less than 0.5 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
- Fix the ignition timing with an allowance against detonation.
- Torque is restricted.
PROBABLE CAUSES
- Failed detonation sensor
- Open/short circuit or harness damage in detonation sensor circuit or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check of open circuit, and damage in K/SE line between detonation sensor connector and engine-ECU connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
STEP 2. Check of open circuit, short circuit, and damage in K/S line between detonation sensor and engine-ECU connector.
Is the check result normal?
Go to Step 3. Repair the connector(s) or wiring harness.
STEP 3. M.U.T.-IIISE diagnosis code
STEP 4. Replace the detonation sensor
- After replacing the detonation sensor, reconfirm whether the diagnosis code is set.
Is the diagnosis code set?
Replace the engine-ECU. Check end.
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