[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0325: Detonation Sensor System | PRINT PAGE / INDEX / PRIOR / NEXT

Code No. P0325: Detonation Sensor System
OPERATION The sensor signal is inputted to the engine-A/T-ECU (terminal No. 89) 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 Conditions After 2 seconds have passed since the engine starting sequence was completed. Engine speed is 2,500 r/min or higher. Volumetric efficiency is 40% or more. <Vehicles except for Hong kong> Judgment Criterion Change of detonation sensor output voltage (detonation sensor peak voltage in each 1/2 turn of the crankshaft) has not been 0.06 V or more in the last consecutive 200 periods.
PROBABLE CAUSE Failed detonation sensor Open/short circuit in detonation sensor circuit or loose connector contact Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. Connector check: B-103 detonation sensor connector
| Q: Is the check result normal? YES: Go to Step 2 . NO: Repair.
| STEP 2. Perform resistance measurement at B-103 detonation sensor connector.
| 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.
| STEP 3. Connector check: C-136 engine-A/T-ECU connector
| Q: Is the check result normal? YES: Go to Step 4 . NO: Repair.
| STEP 4. Check harness between B-103 (terminal No. 1) detonation sensor connector and C-136 (terminal No. 89) engine-A/T-ECU connector.
| Check output line for open/short circuit and damage. Q: Is the check result normal? YES: Go to Step 5 . NO: Repair.
| STEP 5. Check the trouble symptoms. Q: Does trouble symptom persist? YES: Go to Step 6 . NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
| STEP 6. Replace detonation sensor. After replacing the detonation sensor, re-check the trouble symptoms. Q: Does trouble symptom persist? YES: Replace engine-A/T-ECU. NO: Check end.

[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0325: Detonation Sensor System | PRINT PAGE / INDEX / PRIOR / NEXT

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