Trouble Code Conditions

4-1-1 THROTTLE POSITION SENSOR, SIGNAL





Trouble Code Conditions
- Diagnostic trouble code (DTC) EFI-411 is stored if the engine control module (ECM) receives a signal from the throttle position (TP) sensor corresponding to a throttle angle of less than -3.3° (0.1 Volts) (signal too low) or higher than 100.1° (4.9 Volts) (signal too high).

Substitute value(s)
- Idle air trim disabled.
- Throttle angle set to 32.2°.
- The engine control module uses the mass air flow (MAF) sensor signal to determine idling position.
- The engine control module uses the mass air flow sensor signal and engine speed (RPM) to determine full-load position.
- Leakage diagnostic is turned off.
- Pulsed secondary air injection (PAIR) diagnostic disabled.

Possible source(s)
Signal too high:
- Short-circuit to supply voltage in power or signal cable.
- Open-circuit in signal cable or ground lead.
- Contact resistance in terminals.
- Defective throttle position sensor.

Signal too low:
- Short-circuit to ground in power or signal cable.
- Open-circuit in power cable - contact resistance in terminals.
- Defective throttle position sensor.

Fault symptom(s)
- Car feels sluggish.
- High idling speed in neutral.





Other Diagnostic Trouble Codes
- Read off other diagnostic trouble codes.
- Are diagnostic trouble codes EFI-123, EFI-1 12 and EFI-314 stored?

Yes:
^ Check common throttle position sensor, engine coolant temperature (ECT) sensor and camshaft position (CMP) sensor) terminal # A18 on the engine control module for contact resistance, oxidation or an open-circuit.

No:
^ Proceed to test step below.





Other DTCs and Status Messages
Status message
- Select one of the following options to continue:

Alternative 1:
- Refer to: Signal Too High. Permanent Fault.

Alternative 2:
- Refer to: Signal Too Low. Permanent Fault.

Alternative 3:
- Refer to: Signal Too High. Intermittent Fault.

Alternative 4:
- Refer to: Signal Too Low. Intermittent Fault.