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P0220



DTC P0220

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

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection






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. Each sensor has the following circuits:
- A 5-Volt reference circuit
- A low reference circuit
- A 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. Both processors monitor each other's 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 P0641 is not set.
- DTCs P0120, P0122, P0123, P0220, P0222, P0223 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.
- DTCs P0120, P0220, P0641, P0651 are not set.
- DTC P2135 runs continuously when the above conditions are met.

CONDITIONS FOR SETTING THE DTC

P0120
TP sensor 1 voltage is less than 0.27 volt or more than 4.67 volts for more than 0.5 second.

P0122
The ECM detects that the TP sensor 1 voltage is less than 0.27 volt for more than 0.4 second.

P0123
The ECM detects that the TP sensor 1 voltage is more than 4.67 volts for more than 0.4 second.

P0220
The TP sensor 2 voltage is less than 0.31 volt or more than 4.7 volts for more than 0.5 second.

P0222
The ECM detects that the TP sensor 2 voltage is less than 0.31 volt for more than 0.4 second.

P0223
The ECM detects that the TP sensor 2 voltage is more than 4.7 volts for more than 0.4 second.

P2135
The difference between the TP sensor 1 and TP sensor 2 exceeds a predetermined value for more than 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records.
- The control module commands the TAC system to operate in the Reduced Engine Power mode.
- A message center or an indicator displays Reduced Engine Power.
- Under certain conditions the control module commands the engine OFF.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
- With the ignition ON, observe the TP sensor 1 voltage parameter with the accelerator pedal in the rest position. The voltage should be between 0.27-4.67 volts.
- With the ignition ON, observe the throttle position (TP) sensor 2 voltage parameter with the accelerator pedal in the rest position with a scan tool. The voltage should be between 0.31-4.7 volts.
- Observe the TP sensors 1 and 2 parameter. The scan tool should indicate Agree.

CIRCUIT/SYSTEM TESTING
1. 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.
2. With the ignition ON, use a scan tool to observe the TP sensor 1 voltage with the accelerator pedal in the rest position. The voltage should be between 0.27-4.67 volts.
- If more than 4.67 volts, test the low reference circuit for an open or a faulty ECM.
- If less than 0.27 volt, test the TP sensor 1 signal circuit for a short to ground or a faulty ECM.
3. With the ignition ON, observe the TP sensor 2 voltage with the accelerator pedal in the rest position with a scan tool. The voltage should be between 0.31-4.7 volts.
- If more than 4.7 volts, test the low reference circuit for an open or a faulty ECM.
- If less than 0.31 volt, test the TP sensor 2 signal circuit for a short to ground or a faulty ECM.
4. With the ignition ON, use a scan tool to observe the DTCs.
- If DTC P0120 is the only code set, replace the ECM.
- If DTC P0220 is the only code set, replace the ECM.
- If any other codes are set, Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions
5. Disconnect the throttle body harness connector and verify the scan tool TP sensor 1 voltage is less than 0.1 volt.
- If more than 0 volts, test the TP sensor 1 signal circuit for a short to voltage or a faulty ECM.
6. With the throttle body harness connector still disconnected, verify the scan tool TP sensor 2 voltage is greater than 4.8 volts.
- If less than 4.8 volts, test the TP sensor 2 signal circuit for a short to ground or a faulty ECM.
7. With the ignition ON, test for 4.8-5.2 volts between both 5-Volt reference circuits and the negative terminal of the battery.
- If more than 5.2 volts, test both 5-Volt reference circuits for a short to voltage or faulty ECM.
- If less than 4.8 volts, test both the 5-Volt reference circuits for an open or short to ground or a faulty ECM.
8. Install a 3-amp fused jumper wire between the signal circuit and the 5-Volt reference circuit of the TP sensor 1 and 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 an open, a short to ground, or a faulty ECM.
9. Install a test lamp between the signal circuit and the negative terminal of the battery of the TP sensor 2 and verify the TP sensor 2 voltage is less than 0.1 volt.
- If more than 0.1 volt, test the TP sensor 2 signal circuit for an open or a faulty ECM.
- If test lamp illuminates, test the TP sensor 2 signal circuit for a short to voltage or faulty ECM.
10. If all circuits test normal, replace the throttle body.

P2135 only
1. With the ignition OFF, disconnect the throttle body harness connector and the ECM harness connector, and test for less than 5 ohms on each throttle position sensor circuit.
- IF more than 5 ohms, repair the affected circuit or faulty ECM.
- If less than 5 ohms, test for a short between TP sensor 1 signal circuit and TP sensor 2 signal circuit.
2. If all circuits test normal, replace the throttle body.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Control Module References
- Throttle Body Assembly Replacement. Verification Tests
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