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P0122



DTC P0121-P0123 or P0221-P0223 (Without LF1, LFW)

Diagnostic Instructions

- 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.

DTC Descriptors

DTC P0121
Throttle Position Sensor 1 Performance

DTC P0122
Throttle Position Sensor 1 Circuit Low Voltage

DTC P0123
Throttle Position Sensor 1 Circuit High Voltage

DTC P0221
Throttle Position Sensor 2 Performance

DTC P0222
Throttle Position Sensor 2 Circuit Low Voltage

DTC P0223
Throttle Position Sensor 2 Circuit High Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The throttle body assembly contains 2 throttle position sensors. The throttle position sensors are mounted to the throttle body assembly and are not serviceable. The throttle position sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the throttle position sensors with a common 5 V reference circuit, a common low reference circuit, and two independent signal circuits. The throttle position sensors have opposite functionality. Throttle position sensor 1 signal voltage decreases from greater than 4 V at idle to less than 1 V at wide open throttle (WOT). Throttle position sensor 2 signal voltage increases from less than 1 V at idle to greater than 4 V at WOT.

Conditions for Running the DTC

P0121

- The engine speed is greater than 480 RPM.
- The vehicle speed is 0 km/h (0 mph).
- The engine coolant temperature is greater than 5 °C (41 °F).
- The ignition voltage is greater than 8 V.
- The intake air temperature is greater than 5 °C (41 °F).
- DTC P0121 runs continuously when the above conditions are met.

P0122, P0123, P0222, and P0223

- The vehicle speed is 0 km/h (0 mph).
- The engine speed is greater than 250 RPM.
- The engine coolant temperature is greater than 5 °C (41 °F).
- The intake air temperature is greater than 5 °C (41 °F).
- The ignition voltage is greater than 8 V.
- The ignition is ON, with the engine OFF, or the engine is operating.
- DTC P0122 runs continuously when the above conditions are met.

P0221

- The engine speed is greater than 480 RPM.
- The vehicle speed is 0 km/h (0 mph).
- The engine coolant temperature is greater than 5 °C (41 °F).
- The ignition voltage is greater than 8 V.
- The intake air temperature is greater than 5 °C (41 °F).
- DTC P0221 runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0121
The throttle position sensor 1 disagrees greater than 9 % from throttle position sensor 2, or throttle position sensor 1 disagrees greater than 9 % from the predicted value for greater than 1 s or a cumulative of 4 s.

P0122
The ECM detects the throttle position sensor 1 signal voltage is less than 0.18 V for greater than 1 s or a cumulative of 4 s.

P0123
The ECM detects the throttle position sensor 1 signal voltage is greater than 4.6 V for greater than 1 s or a cumulative of 4 s.

P0221
The throttle position sensor 2 disagrees greater than 9 % from throttle position sensor 1, or throttle position sensor 2 disagrees greater than 9 % from the predicted value for greater than 1 s or a cumulative of 4 s.

P0222
The ECM detects the throttle position sensor 2 signal voltage is less than 0.16 V for greater than 1 s or a cumulative of 4 s.

P0223
The ECM detects the throttle position sensor 2 signal voltage is greater than 4.9 V for greater than 1 s or a cumulative of 4 s.

Action Taken When the DTC Sets

- DTCs P0121 and P0221 are Type B DTCs.
- DTCs P0122, P0123, P0222, and P0223 are Type A DTCs.

Conditions for Clearing the DTC

- DTCs P0121 and P0221 are Type B DTCs.
- DTCs P0122, P0123, P0222, and P0223 are Type A DTCs.

Diagnostic Aids

If there is a condition with the throttle position sensors, the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.

Reference Information

Schematic Reference Engine Controls Schematics

Connector End View Reference
Component Connector End Views

Description and Operation
Throttle Actuator Control (TAC) System Description Description and Operation

Electrical Information Reference

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

DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference
Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, verify that DTC P0697, P0698, or P0699 is not set.
2. If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LAU) for further diagnosis.
3. Clear the DTC Info with a scan tool.
4. Start the engine, observe the scan tool Throttle Position Sensor 1 and 2 Voltage parameters. throttle position sensor 1 should be between 0.17-4.6 V, and throttle position sensor 2 should be between 0.15-4.8 V.
5. Observe the scan tool Throttle Position Sensor 1 and 2 parameters while performing the tests listed below. The parameter should display Agree.
- Rapidly depress the accelerator pedal from the rest position to the WOT position and release pedal. Repeat the procedure several times.
- Slowly press down the accelerator pedal to WOT. Then slowly let up the pedal again. Repeat the procedure several times.

6. Check the DTC information with a diagnostic tool. DTCs P0121, P0122, P0123, P0221, P0222, and P0223 should not generated.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Q38 throttle body assembly.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal C and ground.
3. 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 K20 Engine Control Module.
4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.
5. If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace K20 Engine Control Module.
6. If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace K20 Engine Control Module.
7. Ignition ON, verify that the scan tool Throttle Position Sensor 1 Voltage parameter is less than 0.3 V.
8. If greater than the specified range, test the signal circuit's pin D for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
9. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal E and the throttle position sensor 1 signal circuit terminal D. Verify the scan tool Throttle Position Sensor 1 Voltage parameter is greater than 4.89 V.
10. If less than the specified value, test the signal circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace K20 Engine Control Module.
11. Verify the scan tool Throttle Position Sensor 2 Voltage parameter is greater than 4.97 V.
12. If lower than the specified range, test the signal circuit's pin F for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

13. NOTE: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage.

Connect a 3 A fused jumper wire between the throttle position sensor 2 signal circuit terminal F and the low reference circuit terminal C. Verify the scan tool Throttle Position Sensor 2 Voltage parameter is less than 0.10 V.

14. If greater than the specified value, test the signal circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace K20 Engine Control Module.
15. If all circuits test normal, replace the Q38 throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

- Throttle Body Assembly Replacement Throttle Body Assembly Replacement
- Control Module References for engine control module replacement, programming, and setup

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