P0221 Throttle Position Sensor 2 Performance

P0221 code - with the engine running and P2135 DTC active, when fault P2135 becomes active, the Powertrain Control Module (PCM) compares the difference between calculated MAP based on TPS 1 input signal and sensed MAP. The same is done for TPS 2. Set conditions, if the PCM determines that the TPS 2 error is larger than the TPS 1 error, this fault is set.


P0221 Throttle Position Sensor 2 Performance


Default actions, the ETC light will illuminate, the MIL light will illuminate, the Throttle input and vehicle speed are limited.

Possible causes:
  • Excessive resistance in the TPS 2 signal circuit.
  • Throttle position sensor /throttle body.
  • Powertrain Control Module (PCM).

Diagnose code P0221 Throttle Position Sensor 2 Performance

Step 1. Check for an active DTC
Diagnose and repair any Throttle Body circuit, system voltage or 5-Volt reference DTC before continuing with this test. Start the engine and allow it to idle.

Warning: When the engine is operating, do not stand direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

With the scan tool, read DTC. If the DTC does not reset it may be necessary to test drive the vehicle.

Is the DTC actve or pending?

Yes, go to step 3.
No, go to step 2.

Step 2. Throttle follower test
Turn the ignition on. With the scan tool, using the scan tool, perform the ECT Throttle follower test and monitor the TPS1 or TPS 2 voltage. Slowly press the accelerator pedal down. The voltage for TPS 2 should start at approximately 4.3 volts and decrease to approximately 0.7 volts.

Is the TPS 2 voltage within the range of the listed specification?

Yes, perform the PCM intermittent condition.
No, go to step 3.

Step 3. Check for high resistance in the TPS 2 signal circuit
Turn the ignition off, disconnect the Throttle harness connector. Disconnect the PCM harness connector. Measure the resistance of the TPS 2 signal circuit between the Throttle Body harness connector and the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 4.
No, repair the excessive resistance in the TPS 2 signal circuit.

Step 4. Throttle position sensor
Reconnect the PCM harness connector. Turn the ignition on, with the scan tool, monitor TPS 2 voltage. Connect a jumper the TPS 2 signal circuit and the TPS return circuit. The TPS 2 voltage should change from approximately 5.0 volts with the connector unplugged to 0.0 volts with the jumper in place.

Is the voltage reading within the listed specification when the jumper is installed?

Yes, verify there is good to terminal contact in the Throttle Body and Powertrain Control Module (PCM) connectors. If problems are found, replace the Throttle Body Assembly. Disconnect the Battery when replacing the Throttle Body assembly. After installation is complete, use a scan tool perform the ETC RELEARN function.

No, go to step 5.

Step 5. Check related PCM and component connections

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