[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - 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. 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
| 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-110 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-110 (terminal No. 90) engine-A/T-ECU connector.
| Check output line for open or 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: End of check.

[13A] MULTIPORT FUEL INJECTION (MPI) <4G63> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0325: Detonation Sensor System | PRINT PAGE / INDEX / PRIOR / NEXT

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