Part 1 of 3

Chart C-10B A/C Clutch Circuit, (Electronic And Dual Zone A/C):

CIRCUIT DESCRIPTION:
The A/C relay is PCM controlled. It gets battery power when the ignition is turned "ON" and is energized when the PCM completes the circuit to ground. The PCM delays A/C clutch engagement 0.4 seconds after A/C is turned "ON". This allows the IAC to adjust engine rpm before the A/C clutch engages. The PCM also causes the relay to disengage the A/C clutch during WOT operation. The PCM may apply the A/C clutch during cranking to prevent A/C slugging during start-up.

Chart C-10B, Compressor Clutch Diagnosis (1 Of 3):

TEST DESCRIPTION
Numbers below refer to circled numbers on diagnostic chart.
1. Determines whether or not the PCM recognizes the A/c request signal.
2. Checks for an open high pressure cut-out switch,
3. Checks for battery power from the ignition to the control assembly.