• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Throttle Actuator Control (TAC) System Description

The pedal assembly contains 2 potentiometer-type accelerator pedal position sensors, which are not serviceable. When the accelerator pedal is pressed, the voltages of both sensors goes up. This redundant design enables the ECM to detect if the 2 signals indicate the same accelerator pedal position.

• DTC P0697, P06A3 = Not set
• Ignition=OnorEngine=Running
• Ignition Voltage=Greater than 6.4 V

Frequency the DTC runs=Continuously—After the running conditions are met

• DTC P0697, P06A3, P2122, P2123, P2127, P2128 = Not set
• Ignition=OnorEngine=Running
• Ignition Voltage=Greater than 6.4 V
• Reduced Engine Power=Inactive

Frequency the DTC runs=Continuously—After the running conditions are met

APP Sensor 1=Less than 0.46 V—For greater than 1 s

APP Sensor 1=Greater than 4.75 V—For greater than 1 s

APP Sensor 2=Less than 0.32 V—For greater than 1 s

APP Sensor 2=Greater than 2.6 V—For greater than 1 s

APP Sensor 1 and 2=Not within a calibrated range

DTCs listed in the DTC Descriptor category=Type A DTC

• Reduced Engine Power=Active
• Warning Message=Reduced Engine Power

DTCs listed in the DTC Descriptor category=Type A DTC

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify DTC P0641, P0651, P0697, P06A3 is not set
• If any of the DTCs are set

  Refer to:Diagnostic Trouble Code (DTC) List - Vehicle

• If none of the DTCs are set
3. Verify the scan tool parameter:
• APP Sensor 1 Circuit Status=OK
• APP Sensor 2 Circuit Status=OK
• If not the specified state

  Refer to: Circuit/System Testing

• If the specified state
4. Verify the scan tool parameter:APP Sensor 1, 2=The value should not spike or drop out while moving the sensor through the entire range.
• If the value spikes or drops out

  Refer to: Circuit/System Testing

• If the value does not spike or drop out
5. Verify the scan tool parameter:APP Sensor 1 and 2=Agree
• If not the specified state

  Refer to: Circuit/System Testing

• If the specified state
6. Verify the scan tool parameter:APP Sensor 1, 2=The value should not spike or drop out.

   Perform the action while monitoring the parameter:

• Wiggle the harness and connector(s):B107 Accelerator Pedal Position Sensor
• Wiggle the harness and connector(s):K20 Engine Control Module
• If the value spikes or drops out

  Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s)

• If the value does not spike or drop out
7. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC does not set
8. All OK.

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

1. Ignition/Vehicle & All vehicle systems » Off
2. Disconnect the electrical connector:B107 Accelerator Pedal Position Sensor
3. Test for less than 5 Ω between the test points:
• {APP Sensor 1}Low Reference circuit terminal 4&Ground
• {APP Sensor 2}Low Reference circuit terminal 5&Ground
• If 5 Ω or greater
1. Disconnect the appropriate electrical connector:K20 Engine Control Module
2. Test for less than 2 Ω between the test points:
• {APP Sensor 1}Low Reference circuit terminal 4@Component harness&The other end of the circuit@Control module harness
• {APP Sensor 2}Low Reference circuit terminal 5@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If less than 5 Ω
4. Ignition » On / Vehicle » In Service Mode
5. Test for 4.8 to 5.2 V between the test points:
• {APP Sensor 1}5 V Reference circuit terminal 2&Low Reference circuit terminal 4
• {APP Sensor 2}5 V Reference circuit terminal 1&Low Reference circuit terminal 5
• If less than 4.8 V
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for infinite resistance between the test points:
• {APP Sensor 1}5 V Reference circuit terminal 2@Component harness&Ground
• {APP Sensor 2}5 V Reference circuit terminal 1@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:
• {APP Sensor 1}5 V Reference circuit terminal 2@Component harness&The other end of the circuit@Control module harness
• {APP Sensor 2}5 V Reference circuit terminal 1@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If greater than 5.2 V
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:
• {APP Sensor 1}5 V Reference circuit terminal 2@Component harness&Ground
• {APP Sensor 2}5 V Reference circuit terminal 1@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If between 4.8 and 5.2 V
6. Verify the scan tool parameter:
• APP Sensor 1=Less than 0.2 V
• APP Sensor 2=Less than 0.2 V
• If 0.2 V or greater
1. Ignition/Vehicle » Off
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Ignition » On / Vehicle » In Service Mode
4. Test for less than 1 V between the test points:
• {APP Sensor 1}Signal circuit terminal 3@Component harness&Ground
• {APP Sensor 2}Signal circuit terminal 6@Component harness&Ground
• If 1 V or greater » Repair the short to voltage on the circuit.
• If less than 1 V » Replace the component:K20 Engine Control Module
• If less than 0.2 V
7. Connect a 3 A fused jumper wire between the test points:
• {APP Sensor 1}Signal circuit terminal 3&5 V Reference circuit terminal 2
• {APP Sensor 2}Signal circuit terminal 6&5 V Reference circuit terminal 1
8. Verify the scan tool parameter:
• APP Sensor 1=Greater than 4.8 V
• APP Sensor 2=Greater than 4.8 V
• If 4.8 V or less
1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
2. Disconnect the appropriate electrical connector:K20 Engine Control Module
3. Test for infinite resistance between the test points:
• {APP Sensor 1}Signal circuit terminal 3@Component harness&Ground
• {APP Sensor 2}Signal circuit terminal 6@Component harness&Ground
• If less than infinite resistance » Repair the short to ground on the circuit.
• If infinite resistance
4. Test for less than 2 Ω between the test points:
• {APP Sensor 1}Signal circuit terminal 3@Component harness&The other end of the circuit@Control module harness
• {APP Sensor 2}Signal circuit terminal 6@Component harness&The other end of the circuit@Control module harness
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » Replace the component:K20 Engine Control Module
• If greater than 4.8 V
9. Test or replace the component:B107 Accelerator Pedal Position Sensor

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Accelerator Pedal Assembly Replacement
• For control module replacement, programming, and setup refer to:Control Module References