Signal Too Low. Permanent Fault

Checking Power Cable
- Ignition OFF.
- Wait for approx. 150 seconds (cars with immobilizer 245 seconds).
- Disconnect throttle position (TP) sensor.

NOTE: If the engine cooling fan runs on, it must be allowed to stop before taking resistance readings.

- Connect an ohmmeter between throttle position sensor connector terminal 2 and ground.
- The ohmmeter should read 0.3 - 0.8 k ohms.

If reading is OK:
^ Proceed to: Checking The Signal Cable section below.

If value is lower:
^ Check cable between throttle position sensor terminal 2 and engine control module (ECM) # A15 for a short-circuit to ground.
^ Proceed to: Verification section below.

If value is higher:
^ Proceed to: Checking Engine Control Module Connector section below.





Checking Engine Control Module Connector
- Ignition OFF.
- Throttle position sensor disconnected.
- Check engine control module connector for contact resistance and oxidation and remedy.
- Engine control module connected.
- Ignition ON.
- Connect a voltmeter between throttle position sensor connector terminal 2 and ground.
- The voltmeter should read approx. 5 Volts.

If reading is OK:
^ The cause of the diagnostic trouble code (DTC) has been loose connections in the engine control module connector.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Check cable between throttle position sensor terminal 2 and engine control module # A15 for an open-circuit.
^ Proceed to: Verification section below.





Checking The Signal Cable
- Ignition ON.
- Throttle position sensor disconnected.
- Connect a voltmeter between throttle position sensor connector terminal 3 and ground.
- The voltmeter should read approx. 6 Volts.

If reading is OK:
^ Proceed to: Checking Throttle Position Sensor Signal section below.

If reading is incorrect:
^ Check cable between throttle position sensor terminal 3 and control module # A16 for a short-circuit to ground.
^ Proceed to: Verification section below.





Checking Throttle Position Sensor Signal
- Ignition OFF.
- Connect throttle position sensor.
- Start engine
- Go into diagnostic trouble code parameter list.
- Read off throttle angle.
- The throttle angle should be 0° when the engine is idling and should increase as the accelerator pedal (AP) is depressed.

If reading is OK:
^ The cause of the diagnostic trouble code has been loose connections in the throttle position sensor connector.
^ Check connector for contact resistance and oxidation and remedy.
^ Proceed to: Verification section below.

If reading is incorrect:
^ Try a new throttle position sensor.
^ Proceed to: Verification section below.





Verification
After carrying out the repair, check that the fault has been remedied as follows:

- Ignition OFF.
- Throttle position sensor and engine control module connected.
- Ignition ON.
- Go into scrolling values.
- Read off throttle position sensor voltage.
- At closed throttle position (CTP) voltage should exceed 0.1 Volts, at wide open throttle (WOT) voltage should be below 4.9 Volts.

If reading is OK:
^ Fault corrected.

If reading is incorrect:
^ Proceed to: Fault-tracing Information section below.

Fault-tracing Information
The verification result shows that the fault persists.

- Do you want to exit fault-tracing?

Yes:
^ Fault not corrected.

No:
^ Proceed to: Checking Power Cable section above.