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Code No. P2128:
Accelerator Pedal Position Sensor (Sub) Circuit High Input
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OPERATION
- A power voltage of 5 V is applied to the accelerator
pedal position sensor (terminal No. 8) from the engine-A/T-ECU (terminal No. 97).
- The power voltage is earthed to the engine-A/T-ECU (terminal No. 96) from the accelerator
pedal position sensor (terminal No. 7).
- The sensor signal is inputted to the engine-A/T-ECU (terminal No. 107) from the
accelerator pedal position sensor output terminal (terminal No. 6).
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FUNCTION
- The accelerator pedal position sensor (sub) outputs voltage
which corresponds to the accelerator pedal depression.
- The engine-A/T-ECU checks whether the voltage is within a specified range.
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TROUBLE JUDGMENT
Check Conditions
- Ignition switch is in "ON" position.
- Accelerator pedal position sensor (main) output voltage is 0.2 -
2.5 V.
Judgment Criteria
- Accelerator pedal position sensor (sub) output voltage is 4.5 V or higher for 1
second. <Vehicles except for Australia, South africa>
- Accelerator pedal position sensor (sub) output voltage is 4.8 V or higher for 0.3
second. <Vehicles for Australia, South africa>
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PROBABLE CAUSE
- Failed accelerator pedal position sensor
- Open/short circuit in accelerator pedal position sensor circuit or loose connector
contact
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| STEP 1. MUT-II/III data list
- Refer to Data List Reference Table
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- Item 77: Accelerator pedal position sensor (sub)
Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points  ).
NO:
Go to Step 2  .
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| STEP 2. Connector check: B-124 <Vehicles except for Australia,
South africa and Hong kong>
or C-41 <Vehicles for Australia, South africa
and Hong kong>
accelerator pedal position sensor connector
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Q: Is the check result normal?
YES:
Go to Step 3  .
NO:
Repair.
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| STEP 3. Check accelerator pedal position sensor itself.
- Check accelerator pedal position sensor itself (Refer to
).
Q: Is the check result normal?
YES:
Go to Step 4  .
NO:
Replace accelerator pedal position sensor.
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| STEP 4. Perform resistance measurement at B-124 <Vehicles
except for Australia, South africa and Hong kong>
or C-41 <Vehicles for Australia,
South africa and Hong kong>
accelerator pedal position sensor connector.
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- Disconnect connector, and measure at harness side.
- Resistance between terminal No. 7 and earth. <Vehicles except for Australia,
South africa and Hong kong>
- Resistance between terminal No. 8 and earth. <Vehicles for Australia, South
africa and Hong kong>
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 5  .
NO:
Go to Step 6  .
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| STEP 5. MUT-II/III data list
- Refer to Data list reference table
.
- Item 77: Accelerator pedal position sensor (sub)
Q: Is the check result normal?
YES:
Intermittent malfunction (Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points  ).
NO:
Replace engine-A/T-ECU.
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| STEP 6. Connector check: C-137 engine-A/T-ECU connector
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Q: Is the check result normal?
YES:
Go to Step 7  .
NO:
Repair.
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| STEP 7. Check harness between B-124 (terminal No. 7) <Vehicles
except for Australia, South africa and Hong kong>
or C-41 (terminal No. 8) <Vehicles
for Australia, South africa and Hong kong>
accelerator pedal position sensor connector
and C-137 (terminal No. 96) engine-A/T-ECU connector.
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- Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES:
Go to Step 5  .
NO:
Repair.
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