Chrysler 300M 2002 Service Manual page 2685

DRIVEABILITY - NGC
P0645-A/C CLUTCH RELAY CIRCUIT —
TEST
2 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
With the engine running at normal operating temperature, monitor the DRBIII
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIII Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC was set.
With the DRBIII , actuate the A/C Clutch Relay.
Wiggle the wire harness from the A/C Clutch Relay to the PCM while the relay is
actuating.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary
→ Test Complete.
No
3 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Ignition on, engine not running.
Measure the voltage on the Fused Ignition Switch Output circuit in the PDC.
Is the voltage above 11.0 volts?
Yes → Go To 4
→ Repair the open or short to ground in the Fused Ignition Switch
No
4 Turn the ignition off.
Remove the A/C Clutch Relay from the PDC.
Measure the resistance of the A/C Clutch Relay between the Fused Ignition Switch
Output terminal and the A/C Clutch Relay Control terminal.
Is the resistance between 60 to 80 ohms?
Yes → Go To 5
→ Replace the A/C Clutch Relay.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Output circuit. Check and replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
Continued
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APPLICABILITY
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