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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5 V Reference Sensor 1 Circuit | P0122 00, P0222 00, P0641 00, P2110 00, P2135 00 | P2122 00, P2138 00 | P0223 00, P0641 00, P2106 00, P2110 00, P2135 00 | - |
5 V Reference Sensor 2 Circuit | P0107 00, P0405 00, P0651 00, P2106 00 | P2106 00, P2127 00, P2138 00 | P0651 00 | - |
Signal Circuit Sensor 1 | P2122 00 | P2122 00, P2138 00 | P2123 00 | P2138 00 |
Signal Circuit Sensor 2 | P2127 00 | P2127 00, P2138 00 | P2106 00, P2133 00 | P2138 00 |
Low Reference Sensor 1 | - | P2123 00 | - | - |
Low Reference Sensor 2 | - | P2128 00 | - | - |
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: The engine is operating at idle Parameter Normal Range: APP Sensor 1 0.88-1.08 V Parameter Normal Range: APP Sensor 2 0.39-0.59 V | |||
5 V Reference Sensor 1 | 0.00 V | 0.00 V | 2.75 V |
5 V Reference Sensor 2 | 0.00 V | 0.00 V | 1.35 V |
Signal Circuit Sensor 1 | 0.00 V | 0.00 V | 4.98 V |
Signal Circuit Sensor 2 | 0.00 V | 0.00 V | 4.98 V |
Low Reference Sensor 1 | - | 4.96 V | - |
Low Reference Sensor 2 | - | 4.92 V | - |
The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted to the accelerator pedal assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to pedal position. The engine control module (ECM) supplies each APP sensor with a 5 V reference circuit, a low reference circuit, and a signal circuit.
Both the APP sensors 1 and 2 signal percentages increase as the pedal is depressed, from approximately 0% at rest to above 95% when fully depressed.
| • | DTC P0641 00 is not set. |
| • | The ignition is ON or the engine is operating. |
| • | The ignition voltage is greater than 8 V. |
| • | These DTCs run continuously when the above conditions are met. |
| • | DTCs P0651 00 is not set. |
| • | The ignition is ON or the engine is operating. |
| • | The ignition voltage is greater than 8 V. |
| • | The ECM is not commanding reduced power. |
| • | The accelerator pedal is not in the rest position. |
| • | These DTCs runs continuously when the above conditions are met. |
| • | The ignition is ON or the engine is operating. |
| • | The ignition voltage is greater than 8 V. |
| • | This DTC runs continuously when the above conditions are met. |
The ECM detects that the APP sensor 1 voltage is less than 0.25 V for less than 1 s.
The ECM detects that the APP sensor 1 voltage is greater than 4.7 V for less than 1 s.
The ECM detects that the APP sensor 2 voltage is less than 0.25 V for less than 1 s.
The ECM detects that the APP Sensor 2 voltage is greater than 4.8 V for less than 1 s.
The ECM detects that APP sensor 1 and APP sensor 2 disagree greater than 4.5% for less than 1 s.
OR
The ECM detects that both APP sensor 1 and APP sensor 2 are 4.5% greater than the learned minimum position for less than 1 s.
| • | DTCs P2122 00, P2123 00, P2127 00, P2128 00, and P2138 00 are Type A DTCs. |
| • | The ECM commands the throttle actuator control system to operate in reduced engine power mode. |
| • | Under certain conditions the engine control module may command the engine OFF. |
| • | The ECM commands the reduced engine power indicator ON. |
DTCs P2122 00, P2123 00, P2127 00, P2128 00, and P2138 00 are Type A DTCs.
| • | If a shared 5 V reference circuit is shorted to ground or shorted to a voltage, other 5 V reference circuits may be affected. |
| • | A high resistance condition on the accelerator pedal position (APP) sensor circuits may cause a DTC to set. |
Throttle Actuator Control (TAC) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| ⇒ | If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle . |
| • | Low reference circuit terminal 4 |
| • | Low reference circuit terminal 5 |
Note: The 5 V reference circuits are internally and externally connected at the ECM. Other component DTCs may be set. If other DTCs are set, review the electrical schematic and diagnose the applicable circuits and components.
| ⇒ | If greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| • | 5 V reference circuit terminal 1 |
| • | 5 V reference circuit terminal 2 |
| ⇒ | If less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified range, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
| • | APP sensor 1 signal circuit terminal 3 |
| • | APP sensor 2 signal circuit terminal 6 |
| • | APP sensor 1 signal circuit terminal 3 |
| • | APP sensor 2 signal circuit terminal 6 |
| ⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup, and programming
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