DTC 44

Diagnostic Chart:

Electrical Schematic:

CIRCUIT DESCRIPTION
The Throttle Position (TP) sensor has an idle switch that sends a signal to the Engine Control Module (ECM). The ECM applies 5 volts to the idle switch. The idle switch is closed with the engine idling (low voltage signal at the ECM) and open with the engine off idle (high voltage signal at the ECM). When the ECM detects a low voltage signal the throttle valve is closed, and when the ECM detects a high voltage signal the throttle valve is open.

Diagnostic Trouble Code (DTC) 44 will set if the following conditions are met for at least 10 seconds:
- High voltage input to the ECM indicated with the engine running at idle (less than 1000 RPM) and the idle switch open "OFF."

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. By jumping the TP sensor the ECM should detect a low voltage signal, and the Tech 1 scan tool should indicate "ON." This will determine whether the malfunction is in the wiring, the ECM or a misadjusted/faulty TP sensor.
2. This step checks the GRY/YEL and BLU/WHT wires for an open, and for a faulty ECM.

DIAGNOSTIC AIDS
A misadjusted TP sensor could cause DTC 44 to set. Before replacing the TP sensor, refer to Throttle Position Sensor / Adjustments for adjustment procedures. Adjustments

INTERMITTENT MALFUNCTIONS
An intermittent malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connections before component replacement.