P2135 Throttle Position Sensor 1/2 Correlation

P2135 code - The Powertrain Control Module (PCM) determines that the TPS 1 and TPS 2 signals are not coherant. Default action this code the ETC light illuminate, the MIL light illuminate.

Possible causes P2135 code

- High resistance in the TPS 1 or TPS 2 signal circuit
- High resistance in the 5-Volt supply circuit
- High resistance in the TPS return circuit
- TPS 1 signal circuit and TPS 2 signal circuit shorted together
- Throttle position sensor/Throttle Body
- Powertrain Control Module (PCM)

Diagnostic test P2135 code

Step 1. Check for an active DTC
Turn the ignition on, with the scan tool read DTCs and record on the repair order.

Is the DTC active or pending?

Yes, go to step 2.
No, go to step 8.

Step 2. Check for an active TPS sensor performance DTC

Are the P0121 or P0221 DTC also active?

Yes, perform the TPS sensor performance DTC that is active before continuing with this test procedure.
No, go to step 3.

Step 3. Check for high resistance in the TPS 1 signal circuit
Turn the ignition off, disconnect the Throttle Body harness connector, disconnect the PCM harness connector. Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Measure the resistance of the TPS 1 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 high resistance in the TPS 1 signal circuit.

Step 4. Check for high resistance in the TPS return circuit
Measure the resistance of the TPS return circuit between the throttle body harness connector and the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 5.
No, repair the high resistance in the TPS return circuit.

Step 5. Check for high resistance in the TPS 2 signal circuit
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 6.
No, repair the high resistance in the TPS 2 signal circuit.

Step 6. Check for high resistance in the 5-Volt supply circuit
Measure the resistance of the 5-volt supply circuit between the throttle body harness connector and the PCM harness connector.

Is the resistance below 3.0 Ohms?

Yes, go to step 7.
No, repair the high resistance in the 5-volt supply circuit.

Step 7. Check related PCM and component connections

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