• | 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 | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
5-Volt Reference | P0122, P0222, P0641, P2106, P2110 | -- | P0122, P0222, P2106, P2110, P2135 | P0223, P0641, P2106, P2110, P2135 | -- |
TP Sensor 1 Signal | P0122, P2135 | P2135 | P0123, P2135 | P0123, P2135 | P2135 |
TP Sensor 2 Signal | P0222, P2135 | P2135 | P0222, P2135 | P0223, P2135 | P2135 |
Low Reference | -- | -- | P0123, P2106, P2110 | -- | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The ignition is ON and the engine is OFF. Parameter Normal Range: TP Sensor 1 7-21% | |||
5-Volt Reference | 0% | 0% | 30-40% |
TP Sensor 1 Signal | 0% | 80-90% | 85-99% |
Low Reference | -- | 85-95% | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The ignition is ON and the engine is OFF. Parameter Normal Range: TP Sensor 2 7-21% | |||
5-Volt Reference | 80-90% | 80-90% | 0% |
TP Sensor 2 Signal | 80-90% | 80-90% | 0% |
Low Reference | -- | 0% | -- |
The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit, a common low reference circuit, and 2 independent signal circuits.
The TP sensors have opposite functionality. TP sensor 1 signal voltage increases from below 1 volt at idle to above 4 volts at wide open throttle (WOT). TP sensor 2 signal voltage decreases from above 4 volts at idle to below 1 volt at WOT.
• | 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 1 voltage is less than 0.3 volt for less than 1 second.
The ECM detects that the TP sensor 1 voltage is greater than 4.8 volts for less than 1 second.
The ECM detects that the TP sensor 2 voltage is less than 0.3 volt for less than 1 second.
The ECM detects that the TP sensor 2 voltage is greater than 4.8 volts for less than 1 second.
The ECM detects that TP sensor 1 and TP sensor 2 disagree greater than 4.5 percent for less than 1 second.
• | DTC P0122 and P0123 are type B DTCs |
• | The ECM uses TP sensor 2 for throttle control. |
• | DTC P0222 and P0223 are type B DTCs |
• | The ECM uses TP sensor 1 for throttle control. |
• | DTC P2135 is a type A DTC. |
• | The ECM commands the throttle actuator control (TAC) system to operate in a Reduced Engine Power mode. |
• | The ECM commands the reduced engine power indicator ON. |
• | DTCs P0122, P0123, P0222, and P0223 are type B DTCs. |
• | DTC P2135 is a type A DTC. |
• | If a shared 5-volt reference circuit is shorted to ground or shorted to a voltage, other 5-volt reference circuits may be affected. |
• | The scan tool 5 volt reference parameter should display between 4.8-5.2 volts. |
Throttle Actuator Control (TAC) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If P0641 is set, refer to DTC P0641 or P0651. |
⇒ | 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 ECM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
• | If TP sensor 1 is less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. |
• | If TP sensor 1 is greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
• | If TP sensor 2 is less than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
• | If TP sensor 2 is greater than specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
• | 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-Volt Reference | P0122 | P0122 | P0122 | -- |
TP Sensor Signal | -- | P0122 | P0123 | -- |
Low Reference | -- | P0123 | -- | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: The engine is operating in Closed Loop. Parameter Normal Range: TP Position Sensor 5%/4.2 Volts | |||
5-Volt Reference | 6%/0.40 Volts | 6%/0.00 Volts | 14%/5.00 Volts |
TP Sensor Signal | 6%/0.00 Volts | 6%/0.00 Volts | 6%/5.00 Volts |
Low Reference | -- | 6%/5.00 Volts | -- |
The throttle body assembly contains a throttle position (TP) sensor. The TP sensor is mounted externally on the throttle body assembly. The TP sensor is a potentiometer which provides a signal voltage that changes relative to the throttle blade angle. The engine control module (ECM) supplies the TP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit. The TP sensor signal voltage decreases from less than 1 volt at idle to greater than 4 volts at wide open throttle (WOT).
• | The ignition is ON or the engine is running. |
• | The DTCs runs continuously when the above condition is met. |
Important: The scan tool displays a voltage near 0.0 volts. Do not use the scan tool voltage parameter to determine if there is a TP sensor condition.
The ECM detects that the TP sensor voltage is less than 0.14 volt for greater than 5 seconds.
The ECM detects that the TP sensor voltage is greater than 4.9 volts for greater than 5 seconds.
DTC P0122 and P0123 are Type A DTCs.
DTC P0122 and P0123 are Type A DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
Important: The 5-volt 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 less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM. |
⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit test normal, replace the ECM. |
⇒ | 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 engine control module replacement, setup, and programming |