Symptom:
P0645-A/C CLUTCH RELAY CIRCUIT
When Monitored and Set Condition:
P0645-A/C CLUTCH RELAY CIRCUIT
When Monitored: With the ignition on. Battery voltage greater than 10 volts. A/C Switch
on.
Set Condition: An open or shorted condition is detected in the A/C clutch relay control
circuit. One Trip Fault.
POSSIBLE CAUSES
A/C CLUTCH RELAY OPERATION
(A17) FUSED IGNITION SWITCH OUTPUT CIRCUIT
A/C CLUTCH RELAY RESISTANCE
(C28) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN
(C28) A/C CLUTCH RELAY CONTROL CIRCUIT SHORT TO GROUND
PCM
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, actuate the A/C Clutch Relay.
Is the A/C Clutch Relay operating?
All
Yes → Refer to the INTERMITTENT CONDITION symptom in the
Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER-2-NGC.
No → Go To 2
2 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Ignition on, engine not running.
Measure the voltage on the (A14) Fused Ignition Switch Output circuit in the PDC.
Is the voltage above 11.0 volts?
All
Yes → Go To 3
No → Repair the open or short to ground in the (A17) Fused Ignition
Switch Output circuit. Check and replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER-2-NGC.
233
DRIVEABILITY - NGC
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