Code No. P0327: Right Bank Detonation Sensor Circuit Low Input
OPERATION
- The sensor signal is input to the engine-ECU (terminal
No. 28) from the right bank detonation sensor (terminal No. 1).
- The power voltage is earthed to the engine-ECU (terminal No. 29) from the right
bank detonation sensor (terminal No. 2).
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 JUDGMENT
Check Condition
- 2 seconds or more have passed since the engine starting sequence was completed.
- Right bank detonation sensor output voltage has continued to be lower than 0.5 V
for 2 seconds.
PROBABLE CAUSES
- Failed right bank detonation sensor
- Open/short circuit or harness damage in right bank detonation sensor circuit or
loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Connector check: B-37 right bank detonation sensor connector |
Q.
Is the check result normal?
|
Go to Step 2 . |
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Repair or replace the connector. |
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STEP 2. Perform resistance measurement at B-37 right bank detonation sensor connector. |
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OK: Continuity (2 Ω
or less) |
Q.
Is the check result normal?
|
Go to Step 6 . |
|
Go to Step 3 . |
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STEP 3. Connector check: B-29 engine-ECU connector |
Q.
Is the check result normal?
|
Go to Step 4 . |
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Repair or replace the connector. |
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STEP 4. Check harness between B-37 (terminal No. 2) right bank detonation sensor connector and B-29 (terminal No. 29) engine-ECU connector. |
|
Q.
Is the check result normal?
|
Go to Step 5 . |
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Repair the damaged harness wire. |
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STEP 5. M.U.T.-III diagnosis code |
|
Q.
Is diagnosis code set?
|
Replace the engine-ECU. |
|
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
|
STEP 6. Connector check: B-29 engine-ECU connector |
Q.
Is the check result normal?
|
Go to Step 7 . |
|
Repair or replace the connector. |
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STEP 7. Check harness between B-37 (terminal No. 1) right bank detonation sensor and B-29 (terminal No. 28) engine-ECU connector. |
|
Q.
Is the check result normal?
|
Go to Step 8 . |
|
Repair the damaged harness wire. |
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STEP 8. M.U.T.-III diagnosis code |
|
Q.
Is diagnosis code set?
|
Go to Step 9 . |
|
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
|
STEP 9. M.U.T.-III diagnosis code |
|
Q.
Is diagnosis code set?
|
Replace the engine-ECU. |
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Check end. |
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