ASAP need to double check diagnosis of bad PCM from dealer, done without mention of testing the pressure switch and it's connection to PCM connector E (31P), terminal 14. I need to know location of the switch/how to access it and location/how to access end of wire at E-14. They traced from other end, as far as terminal A-27 to A/C clutch relay. Their conclusion seems a bit premature. Any other suggestions please. This is my 1st post as new member.

 

1. The A/C pressure switch is right behind the right front bumper side (in front of the A/C condenser). For a V6, there is a 4P gray wire harness connector attached to the switch.

2. PCM harness connector terminal pin E14 is attached to a Red/Grn wire, which will then transition to a Wht/Grn wire (at a 13P white junction connector; located near the PCM). The PCM is located under the middle dash area (the PCM harness connectors are on the right side). The Red/Grn wire is used to detect the A/C pressure switch signal. With A/C pressure switch ON: about 0 V; With A/C pressure switch OFF: battery voltage. The Wht/Grn wire will eventually connect to the A/C pressure switch at the 4P gray harness connector. Red/Grn is a wire with red colored insulation and a green stripe running through it. Wht/Grn is a white wire with a green stripe.

3. PCM harness connector terminal pin A27 is attached to a Red wire. This wire is for A/C clutch relay control (used to drive the A/C clutch relay). With compressor ON: about 0 V; With compressor OFF: battery voltage.

The A/C clutch relay is located in the under-hood fuse/relay box.

 

Hi......What wires would you use to jump the low pressure switch?