P0222

DTC P0222: Throttle Position (TP) Sensor 2 Circuit Low Voltage

Wiring Diagram:

Circuit Description
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 plate 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 V at idle to above 4 V at Wide Open Throttle (WOT). TP sensor 2 signal voltage decreases from above 4 V at idle to below 1 V at WOT.

Conditions for Setting the DTC
- Ignition ON.
- No TP sensor fault exists.
- MTIA voltage is less than 0.25 V.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Records buffers.
- A history DTC is stored.

Conditions for Clearing the MIL/DTC
- The MIL will turn OFF after four consecutive validation cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- The DTC(s) can be cleared by using the scan tool.

Diagnostic Aids
An Intermittent problem may be caused by a poor connection, rubbed through wire insulation, or wire that is broken inside the insulation.
Any circuitry, that is suspected as causing the complaint, should be thoroughly checked for the following conditions:
- Backed-out terminals
- Improper mating
- Broken locks
- Damaged terminals
- Poor terminals to wire connection
- Physical damage to the wiring harness

Test Description
Number(s) below refer to the step number(s) on the Diagnostic Table.
1. This step verifies that a condition exists
2. The TP sensors share a 5 volt reference circuit. If both DTCs P0122 and P0222 set, test for a condition in the 5 volt reference circuit.
3. The ECM produces measurable steady-state amperage that provides the 5 volt reference to the TP sensors. If the amperage on the 5 volt reference circuit is less than 50 mA, test the 5 volt reference circuit for an open or a high resistance.
4. This step tests the signal 2 circuit of the TP sensor. If the TP sensor 2 voltage parameter is not 4.8 - 5.2 V, test for a condition in the signal 2 circuit.

Step 1-6:

Step 7-14:

Troubleshooting