P0222
DTC P0120, P0122, P0123, P0220, P0222, P0223, or P2135
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Strategy Based Diagnosis
* Diagnostic Procedure Instructions
DTC Descriptors
DTC P0120
- Throttle Position (TP) Sensor 1 Circuit
DTC P0122
- Throttle Position (TP) Sensor 1 Circuit Low Voltage
DTC P0123
- Throttle Position (TP) Sensor 1 Circuit High Voltage
DTC P0220
- Throttle Position (TP) Sensor 2 Circuit
DTC P0222
- Throttle Position (TP) Sensor 2 Circuit Low Voltage
DTC P0223
- Throttle Position (TP) Sensor 2 Circuit High Voltage
DTC P2135
- Throttle Position (TP) Sensor 1-2 Correlation
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The throttle actuator control (TAC) system uses two throttle position (TP) sensors to monitor the throttle position. The TP sensors 1 and 2 are located within the throttle body assembly. Sensor circuits consist of the following:
* A 5-volt reference circuit
* A low reference circuit
* A TP sensor 1 signal circuit
* A TP sensor 2 signal circuit
Two processors are also used to monitor the TAC system data. Both processors are located within the engine control module (ECM). Each signal circuit provides both processors with a signal voltage proportional to throttle plate movement. The processors share and monitor data to verify that the indicated TP calculation is correct.
Conditions for Running the DTC
P0120, P0122, P0123, P0220, P0222, P0223
* The system voltage is more than 5.23 volts.
* The ignition is in the Unlock/Accessory or Run position.
* DTC P0606, P0641, or P0651 is not set.
* The DTCs run continuously when the above conditions are met.
P2135
* The system voltage is more than 5.23 volts.
* The ignition is in the Unlock/Accessory or Run position.
* DTC P0120, P0122, P0123, P0220, P0222, P0223, or P0606 is not set.
* The DTC runs continuously when the above conditions are met.
Conditions for Setting the DTC
P0120
The ECM detects that TP sensor 1 voltage is less than 0.35 volt or more than 4.58 volts for more than 0.5 second.
P0122
The ECM detects that TP sensor 1 voltage is less than 0.35 volt for more than 0.5 second.
P0123
The ECM detects that TP sensor 1 voltage is more than 4.58 volts for more than 0.5 second.
P0220
The ECM detects that TP sensor 2 voltage is less than 0.35 volt or more than 4.59 volts for more than 0.5 second.
P0222
The ECM detects that TP sensor 2 voltage is less than 0.35 volt for more than 0.5 second.
P0223
The ECM detects that TP sensor 2 voltage is more than 4.59 volts for more than 0.5 second.
P2135
The ECM detects that the difference between TP sensor 1 and TP sensor 2 exceeds a predetermined value for more than 0.5 second.
Action Taken When the DTC Sets
* DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
* The control module commands the TAC system to operate in the Reduced Engine Power mode.
Conditions for Clearing the MIL/DTC
DTCs P0120, P0122, P0123, P0220, P0222, P0223, and P2135 are Type A DTCs.
Circuit/System Verification
1. Ignition ON, observe the TP sensor 1 voltage parameter. The reading should be between 0.35-4.58 volts and change with accelerator pedal input.
2. Ignition ON, observe the TP sensor 2 voltage parameter. The reading should be between 0.35-4.59 volts and change with accelerator pedal input.
3. Observe the TP sensor 1 and 2 parameter. The scan tool should indicate agree.
4. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC, or within the conditions that you observed from the Freeze Frame/Failure Records.
^ If DTC P0120 or P0220 are the only DTCs set, replace the control module.
^ If DTC P0641 or P0651 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the throttle body. Allow sufficient time for the ECM to completely power down.
2. Ignition OFF, test for less than 5 ohms of resistance between each low reference circuit terminal B and G and ground.
^ If greater than 5 ohms, test the affected low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, test for 4.8-5.2 volts between each 5-volt reference circuit terminal C and ground, and terminal H and ground.
^ If less than 4.8 volts, test the affected 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
^ If greater than 5.2 volts, test the affected 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ECM.
4. Verify the scan tool TP sensor 1 voltage is less than 0.1 volt.
^ If greater than 0.1 volt, test the signal circuit terminal A for a short to voltage. If the circuit tests normal, replace the ECM.
5. Verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.
^ If less than 4.8 volts, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the ECM.
6. Install a 3A fused jumper wire between the signal circuit terminal A and the 5-volt reference circuit terminal C of the TP sensor 1, verify the TP sensor 1 voltage is greater than 4.8 volts.
^ If less than 4.8 volts, test the TP sensor 1 signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
7. Install a 3A fused jumper wire between the signal circuit terminal D and the low reference circuit terminal B of the TP sensor 2, verify that the TP sensor 2 voltage is less than 0.1 volt.
^ If greater than 0.1 volt, test the TP sensor 2 signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
8. Ignition OFF, disconnect the harness connector at the ECM.
9. Test for less than 5 ohms of resistance on all TP sensor circuits between the following terminals:
* ECM C2 5-volt reference circuit terminal 44 to terminal C.
* ECM C2 5-volt reference circuit terminal 44 to terminal H.
* ECM C2 signal circuit terminal 64 to terminal A.
* ECM C2 signal circuit terminal 64 to terminal D.
^ If greater than 5 ohms, repair the affected circuit.
10. Test for infinite resistance between TP sensor 1 signal circuit terminal A and TP sensor 2 signal circuit terminal D.
^ If less than infinite resistance, repair the short between TP sensor 1 signal circuit and TP sensor 2 signal circuit.
11. If all circuits test normal, replace the throttle body.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Refer to Programming and Relearning for setup, and Programming.Programming and Relearning
* Throttle Body Assembly Replacement