Checking The Component And Wiring

Check the connector for the air conditioning (A/C) pressure sensor. Check for contact resistance and oxidation.

Check the signal cable. Check for a short-circuit to supply voltage.

Take readings between:

• Engine Control Module (ECM) #B51 (#C51) and AC pressure sensor #2.

Check the ground lead. Check for an open-circuit.

Take readings between:

• Engine Control Module (ECM) #B53 (#C53) and AC pressure sensor #1.

Check the power cable with regard to open circuit.

Take readings between:

• Engine Control Module (ECM) #B31 (#C31) and AC pressure sensor #3.

HINT: The voltage must be approximately 5 V between air conditioning (A/C) pressure sensor terminal #3 and ground with the ignition switched on. 

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see LOCATION OF COMPONENTS, ENGINE COMPARTMENT
• see CHECKING WIRING AND TERMINALS

• Continue 

  Refer to VERIFICATION