Description

DATA TROUBLE CODE: 51

SYSTEM: Switch Condition Signal Circuit

WIRING DIAGRAM




CIRCUIT DESCRIPTION
Park/Neutral Position Switch Signal
The engine control module (ECM) uses the signals from the park/neutral position switch to determine whether the transmission is in park or neutral, or in some other gear.
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 closed throttle position switch OFF (IDL).
- Park/neutral position switch OFF. (shift position in "R", "D", "2" or "L").
- A/C switch ON.

TROUBLE AREA
- Throttle position sensor IDL circuit
- Accelerator pedal and cable
- Park/neutral position switch circuit [1]
- A/C switch circuit
- ECM

[1] Only vehicles with A/T.

HINT: In this circuit, diagnosis can only be made in the test mode.