Description

DATA TROUBLE CODE: 51

SYSTEM: Switch Condition Signal Circuit

WIRING DIAGRAM





CIRCUIT DESCRIPTION
Park/Neutral Position Switch
The ECM uses the signals from the park/neutral position switch to determine whether the transmission is in park or neutral, or in some other position.

Air Conditioning Switch Signal
The ECM uses the output from the air conditioning switch to determine whether or not the air conditioning is operating so that it can increase the idling speed of the engine if necessary.

Throttle Position Sensor IDL Signal
The IDL contacts are mounted in the throttle position sensor, and detects the idle condition.

DIAGNOSTIC TROUBLE CODE DETECTING CONDITION
- 3 seconds or more after engine starts with idle switch (IDL1) OFF.
OR
- Park/neutral position switch OFF (shift position in "R", "D", "2" or "1" position.)
OR
- A/C switch ON.

NOTE: In this circuit, diagnosis can only be made in the Test mode.

TROUBLE AREA
- Throttle position sensor "IDL" circuit.
- Accelerator pedal and cable.
- Park/neutral position switch.
- A/C switch circuit.
- ECM.