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P2122






P2122-ACCELERATOR PEDAL POSITION SENSOR 1 CIRCUIT LOW





For a complete wiring diagram Refer to the Wiring Information

- When Monitored:
With the ignition on and battery voltage greater than 10.4 volts.

- Set Condition:
The PCM detects that the APP Sensor 1 input voltage is below the minimum acceptable value.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Pre-Diagnostic Troubleshooting Procedure

1. DTC IS ACTIVE

NOTE: Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

1. Start the engine and allow it to reach normal operating temperature.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

2. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking for an Intermittent DTC

2. (F856) 5 VOLT SUPPLY CIRCUIT VOLTAGE




1. Turn the ignition off.
2. Disconnect the Accelerator Pedal Position Sensor connector.
3. Turn the ignition on.
4. Measure the voltage of the (F856) 5 Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

Is the voltage above 4.5 volts?

Yes

- Go to 6

No

- Go to 3

3. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition on.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (F856) 5 Volt Supply circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 1000 ohms?

Yes

- Go to 4

No

- Repair the (F856) 5 Volt Supply circuit for a short to ground.
- Perform the PCM Verification TestPCM Verification Test.

4. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO (K167) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (F856) 5 Volt Supply circuit and the (K167) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 100 ohms?

Yes

- Go to 5

No

- Repair the (F856) 5 Volt Supply circuit for a short to the (K167) Sensor Ground circuit.
- Perform the PCM Verification TestPCM Verification Test.

5. (F856) 5 VOLT SUPPLY CIRCUIT SHORTED TO (K400) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (F856) 5 Volt Supply circuit and the (K400) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 100 ohms?

Yes

- Go to 6

No

- Repair the (F856) 5 Volt Supply circuit for a short to the (K400) Sensor Ground circuit.
- Perform the PCM Verification TestPCM Verification Test.

6. (F856) 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE




1. Measure the resistance of the (F856) 5 Volt Supply circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go to 7

No

- Repair the (F856) 5 Volt Supply circuit for an open circuit or high resistance.
- Perform the PCM Verification TestPCM Verification Test.

7. (K23) APP SIGNAL 1 CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground and the (K23) APP Signal 1 circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 100 ohms?

Yes

- Go to 8

No

- Repair the (K23) APP Signal 1 circuit for a short to ground.
- Perform the PCM Verification TestPCM Verification Test.

8. (K23) APP SIGNAL 1 CIRCUIT SHORTED TO (K167) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (K23) APP Signal 1 circuit and the (K167) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 100 ohms?

Yes

- Go to 9

No

- Repair the (K23) APP Signal 1 circuit for a short to the (K167) Sensor Ground circuit.
- Perform the PCM Verification TestPCM Verification Test.

9. (K23) APP SIGNAL 1 CIRCUIT SHORTED TO (K400) SENSOR GROUND CIRCUIT




1. Measure the resistance between the (K23) APP Signal 1 circuit and the (K400) Sensor Ground circuit in the Accelerator Pedal Position Sensor harness connector.

Is the resistance above 100 ohms?

Yes

- Go to 10

No

- Repair the (K23) APP Signal 1 circuit for a short to the (K400) Sensor Ground circuit.
- Perform the PCM Verification TestPCM Verification Test.

10. (K23) APP SIGNAL 1 CIRCUIT OPEN OR HIGH RESISTANCE




1. Measure the resistance of the (K23) APP Signal 1 circuit between the Accelerator Pedal Position Sensor harness connector and the Powertrain Control Module (PCM) harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go to 11

No

- Repair the (K23) APP Signal 1 circuit for an open circuit or high resistance.
- Perform the PCM Verification TestPCM Verification Test.

11. ACCELERATOR PEDAL POSITION SENSOR




1. Turn the ignition off.
2. Connect the Powertrain Control Module (PCM) connector.
3. Connect a jumper wire between the (F856) 5 Volt Supply circuit and the (K23) APP Signal 1 circuit in the Accelerator Pedal Position Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, read the Accelerator Pedal Position Sensor signal voltage.

Is the voltage above 4.5 volts with the jumper wire in place?

Yes

- Replace the Accelerator Pedal Position Sensor.
- Perform the PCM Verification TestPCM Verification Test.

No

- Go to 12

12. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Accelerator Pedal Position Sensor and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification TestPCM Verification Test.

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification TestPCM Verification Test.

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