Inspection Procedure 10: Crank Angle Sensor System
OPERATION
- Power is supplied to the crank angle sensor (terminal
No. 1) from the engine-ECU (terminal No. 88) and is earthed to the engine-ECU (terminal No.
77) from the crank angle sensor (terminal No. 3).
- A power voltage of 5 V is applied to the crank angle sensor output terminal (terminal
No. 2) from the engine-ECU (terminal No. 89).
FUNCTION
- The crank angle sensor detects the crank angle (position)
and inputs a pulse signal to the engine-ECU.
- In response to the signal, the engine-ECU controls the injector, etc.
PROBABLE CAUSES
- Failed crank angle sensor
- Open/short circuit or harness damage in crank angle sensor circuit or loose connector
contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Connector check: B-22 crank angle sensor connector |
Q.
Is the check result normal?
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Go to Step 2 . |
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Repair or replace the connector. |
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STEP 2. Perform voltage measurement at B-22 crank angle sensor connector. |
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OK: 4.9 -
5.1 V |
Q.
Is the check result normal?
|
Go to Step 6 . |
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Go to Step 3 . |
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STEP 3. Connector check: B-17 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-22 (terminal No. 2) crank angle sensor connector and B-17 (terminal No. 89) engine-ECU connector. |
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Q.
Is the check result normal?
|
Go to Step 5 . |
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Repair or replace the connector. |
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STEP 5. Check the trouble symptoms. |
Q.
Does trouble symptom persist?
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Replace the engine-ECU. |
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Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
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STEP 6. Perform voltage measurement at B-22 crank angle sensor connector. |
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OK: 4.9 -
5.1 V |
Q.
Is the check result normal?
|
Go to Step 9 . |
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Go to Step 7 . |
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STEP 7. Connector check: B-17 engine-ECU connector |
Q.
Is the check result normal?
|
Go to Step 8 . |
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Repair or replace the connector. |
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STEP 8. Check harness between B-22 (terminal No. 1) crank angle sensor connector and B-17 (terminal No. 88) 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 9. Perform resistance measurement at B-22 crank angle sensor connector. |
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OK: Continuity (2 Ω
or less) |
Q.
Is the check result normal?
|
Go to Step 12 . |
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Go to Step 10 . |
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STEP 10. Connector check: B-17 engine-ECU connector |
Q.
Is the check result normal?
|
Go to Step 11 . |
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Repair or replace the connector. |
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STEP 11. Check harness between B-22 (terminal No. 3) crank angle sensor connector and B-17 (terminal No. 77) engine-ECU connector. |
|
Q.
Is the check result normal?
|
Go to Step 5 . |
|
Repair the damaged harness wire. |
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STEP 12. Connector check: B-17 engine-ECU connector |
Q.
Is the check result normal?
|
Go to Step 13 . |
|
Repair or replace the connector. |
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STEP 13. Check harness between B-22 (terminal No. 1) crank angle sensor connector and B-17 (terminal No. 88) engine-ECU connector. |
|
Q.
Is the check result normal?
|
Go to Step 14 . |
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Repair the damaged harness wire. |
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STEP 14. Check harness between B-22 (terminal No. 2) crank angle sensor connector and B-17 (terminal No. 89) engine-ECU connector. |
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Q.
Is the check result normal?
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Go to Step 15 . |
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Repair the damaged harness wire. |
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STEP 15. Check the crankshaft sensing ring. |
Q.
Is the check result normal?
|
Go to Step 16 . |
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Replace the crankshaft sensing ring. |
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STEP 16. Replace the crank angle sensor. |
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Q.
Does trouble symptom persist?
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Replace the engine-ECU. |
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The check is end. |
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