Code No. P2122: Accelerator Pedal Position Sensor (main) Circuit Low Input
OPERATION
- A power voltage of 5 V is applied to the accelerator
pedal position sensor (terminal No. 1) from the engine-ECU (terminal No. 75).
- The power voltage is earthed to the engine-ECU (terminal No. 76) from the accelerator
pedal position sensor (terminal No. 2).
- The sensor signal is inputted to the engine-ECU (terminal No. 74) from the accelerator
pedal position sensor output terminal (terminal No. 3).
FUNCTION
- The accelerator pedal position sensor (main) outputs
voltage which corresponds to the accelerator pedal depression.
- The engine-ECU checks whether the voltage is within a specified range.
TROUBLE JUDGMENT
Check Condition
- Ignition switch is "ON" position.
- Accelerator pedal position sensor (main) output voltage is 0.2 V or less.
PROBABLE CAUSES
- Failed accelerator pedal position sensor (main)
- Open/short circuit or harness damage in accelerator pedal position sensor main circuit
or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. M.U.T.-III data list |
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Q.
Is the check result normal?
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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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Go to Step 2 . |
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STEP 2. Connector check: C-124 accelerator pedal position sensor connector |
Q.
Is the check result normal?
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Go to Step 3 . |
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Repair or replace the connector. |
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STEP 3. Perform voltage measurement at C-124 accelerator pedal position sensor connector. |
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OK: 4.9 -
5.1 V |
Q.
Is the check result normal?
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Go to Step 7 . |
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Go to Step 4 . |
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STEP 4. Connector check: B-30 engine-ECU connector |
Q.
Is the check result normal?
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Go to Step 5 . |
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Repair or replace the connector. |
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STEP 5. Check harness between C-124 (terminal No. 1) accelerator pedal position sensor connector and B-30 (terminal No. 75) engine-ECU connector. |
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Q.
Is the check result normal?
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Go to Step 6 . |
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Repair the damaged harness wire. |
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STEP 6. M.U.T.-III data list |
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Q.
Is the check result normal?
|
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points -
How to Cope with Intermittent Malfunctions ). |
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Replace the engine-ECU. |
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STEP 7. Connector check: B-30 engine-ECU connector |
Q.
Is the check result normal?
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Go to Step 8 . |
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Repair or replace the connector. |
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STEP 8. Check harness between C-124 (terminal No. 1) accelerator pedal position sensor connector and B-30 (terminal No. 75) engine-ECU connector. |
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Q.
Is the check result normal?
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Go to Step 9 . |
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Repair the damaged harness wire. |
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STEP 9. Check harness between C-124 (terminal No. 3) accelerator pedal position sensor connector and B-30 (terminal No. 74) engine-ECU connector. |
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Q.
Is the check result normal?
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Go to Step 10 . |
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Repair the damaged harness wire. |
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STEP 10. Replace the accelerator pedal assembly |
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Q.
Is the check result normal?
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Check end. |
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Replace the engine-ECU. |
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