B-4 A/C Signal Circuit Check (If Equipped)

Circuit Diagram:

Terminal Arrangement Of ECM(PCM) Coupler(Viewed From Harness Side):

CIRCUIT DESCRIPTION
ECM (PCM) outputs A/C ON signal (one of the signals for A/C control module to control the A/C) to A/C control module when A/C switch signal inputted to ECM (PCM) and engine conditions are specified.

Step 1:

Step 2:

TROUBLESHOOTING