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
connector terminal from the engine-ECU connector terminal AP5.
- The power voltage is earthed to the engine-ECU connector terminal APE from the accelerator pedal
position sensor connector terminal.
- The sensor signal is inputted to the engine-ECU connector terminal APSS from the
accelerator pedal position sensor output terminal.
FUNCTION
- The accelerator pedal position sensor converts the opening degree of the
accelerator pedal into the voltage signal to input it to the engine ECU.
- The engine ECU uses this signal to determine the amount of basic fuel injection.
TROUBLE JUDGMENT
Check Conditions
- 2 seconds later after the ignition switch has been in "ON" position
- Battery positive voltage is 6 - 16 V.
- Accelerator pedal position sensor (main) is normal.
- Accelerator pedal position sensor (main) output voltage is 0.2 V or higher and 2.8
V or lower.
- Accelerator pedal position sensor (sub) output voltage is 2.4 V or more.
FAIL-SAFE AND BACKUP FUNCTION
- The amount of depression of the accelerator pedal is detected, using the
accelerator pedal position sensor (main) signal, which is calculated by taking half of the normal
value.
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. Perform resistance measurement at 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 5. |
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Go to Step 3. |
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STEP 3. Check harness between accelerator pedal position sensor connector terminal and engine-ECU connector terminal APE. |
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Q.
Is the check result normal?
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Go to Step 4. |
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Repair or replace the connector, or repair the damaged harness wire. |
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STEP 4. 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 5. Replace the accelerator pedal assembly |
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Q.
Is the check result normal?
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The check is end. |
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Replace the engine-ECU. |
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