DTC 45

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.

DTC 45 will set if the following conditions are met for at least 3 seconds:
- Larger than 30° throttle valve opening or a charging efficiency greater than 40% and an engine speed greater than 2300 RPM with the idle switch closed "ON."

CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. By disconnecting the TP sensor the ECM should detect a high voltage signal and the Tech 1 should indicate "OFF." This will check for a short to ground in the BLU/WHT wire.
2. This checks for a short to voltage in the GRY/RED wire or a misadjusted/faulty TP sensor.

DIAGNOSTIC AIDS
A misadjusted TP sensor could cause DTC 45 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.