DTC 51

CODE - 51 SWITCH CONDITION SIGNAL CIRCUIT

Circuit Description

Park/Neutral Position Switch Signal-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 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.




Detecting Condition

* Only vehicles with A/T.

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




Diagnostic Chart




Wiring Diagram

Step 1:

Step 2:

Step 3:

Step 4:

Inspection Procedure