• | 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 | Short to Voltage |
---|---|---|---|
5-Volt Reference | P0122, P1122 | P0122, P1122 | P0123, P1121 |
Throttle Position Sensor Signal | P0122, P1122 | P0122, P1122 | P0123, P1121 |
Low Reference | -- | P0123, P1121 | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The engine is operating at idle. Parameter Normal Range: TP Position Sensor 0% | |||
5-Volt Reference | 0% | 0% | 99% |
Throttle Position Sensor Signal | 0% | 0% | 99% |
Low Reference | -- | 99% | -- |
The throttle position (TP) sensor is used by the engine control module (ECM) to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with the following 3 circuits:
• | A 5-volt reference |
• | A low reference |
• | A signal |
The ECM provides the TP sensor with 5 volts on the 5-volt reference circuit, and a ground on the low reference circuit. The TP sensor provides a signal voltage feedback that changes relative to throttle plate angle.
• | The ignition is ON or the engine is running. |
• | The DTCs runs continuously when the above condition is met. |
The ECM detects that the TP sensor voltage is less than 0.3 volt intermittently.
The ECM detects that the TP sensor voltage is greater than 4.9 volts intermittently.
DTCs P1121 and P1122 are Type C DTCs.
DTCs P1121 and P1122 are Type C DTCs.
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. |
Engine running, observe the scan tool throttle position (TP) sensor parameter while moving the related wiring harness and harness connectors. The reading should not change abruptly.
⇒ | If the reading changes abruptly, repair the wiring harness and harness connectors. |
⇒ | If not within the specified range, replace the TP sensor. |
⇒ | If not within the specified range or is erratic, replace the TP sensor. |
⇒ | If not within the specified range or is erratic, replace the TP sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |