Code No. P2128: Accelerator Pedal Position Sensor (Sub) Circuit High Input
OPERATION
- A power voltage of 5 V is applied to the accelerator
pedal position sensor (terminal No. 4) from the engine-ECU (terminal No. 78).
- The power voltage is earthed to the engine-ECU (terminal No. 79) from the accelerator
pedal position sensor (terminal No. 5).
- The sensor signal is inputted to the engine-ECU (terminal No. 77) from the accelerator
pedal position sensor output terminal (terminal No. 6).
FUNCTION
- The accelerator pedal position sensor (sub) 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 (sub) output voltage is 2.5 V or higher.
PROBABLE CAUSES
- Failed accelerator pedal position sensor
- Open circuit or harness damage in accelerator pedal position sensor 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 resistance measurement at C-124 accelerator pedal position sensor connector. |
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OK: Continuity (2 Ω or less) |
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. 5) accelerator pedal position sensor connector and B-30 (terminal No. 79) 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?
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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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Replace the engine-ECU. |
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STEP 7. 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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