Charger V6-3.5L (2009)
Compressor Clutch Coil: Testing and Inspection
A/C CLUTCH COIL
The A/C clutch coil electrical circuit is controlled by the Powertrain Control Module (PCM) or Engine Control Module (ECM) (depending on engine
application) through the Totally Integrated Power Module (TIPM). The A/C clutch coil can be tested by either measuring clutch field coil resistance or
by measuring current draw. Begin testing of a suspected compressor clutch coil problem by performing the preliminary checks.
PRELIMINARY CHECKS
1. If the A/C compressor clutch will not engage, perform the A/C System Performance Test, which is found within the HVAC System Test See:
Testing and Inspection/Component Tests and General Diagnostics/HVAC System Test. If no diagnostic trouble codes (DTCs) are found in the
A/C-heater control, PCM/ECM or the TIPM, go to 2. If any DTCs are found, repair as required.
2. If the A/C compressor clutch still will not engage, verify the refrigerant charge level See: Testing and Inspection/Component Tests and General
Diagnostics/Heating and Air Conditioning. If the refrigerant charge level is OK, go to COIL RESISTANCE TEST and/or COIL CURRENT
DRAW TEST. If the refrigerant charge level is not OK, adjust the refrigerant charge as required.
COIL RESISTANCE TEST
1. Disconnect and isolate the negative battery cable.
2. Disconnect the wire harness connector from the A/C clutch field coil connector.
3. Use an ohm meter and Back Probe Tool 6801 and measure the resistance of the clutch field coil at the field coil connector terminals.
4. See A/C Clutch Coil Specifications chart for the acceptable A/C clutch coil resistance. Specifications apply for a work area temperature of 21° C
(70° F).
a. If the A/C clutch coil reading is below specifications, the coil is shorted and must be replaced.
b. If the A/C clutch coil reading is above specifications, the coil is open and must be replaced.
COIL CURRENT DRAW TEST
1. Verify the battery state of charge See: Starting and Charging/Battery/Testing and Inspection/Battery.
2. Connect an ammeter (0 to 10 ampere scale selected) in series with the clutch field coil feed terminal using Back Probe Tool 6801. Connect a
voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch coil.
3. With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
4. The A/C clutch should engage immediately, and the clutch field coil supply voltage should be within two volts of the battery voltage. If the field
coil supply voltage is OK, go to 5. If the field coil supply voltage is not within two volts of battery voltage, test the clutch field coil feed circuit for
excessive voltage drop and repair as necessary.
5. See A/C Clutch Coil Specifications chart for the acceptable A/C clutch field coil current draw. Specifications apply for a work area temperature of
21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts.
a. If the A/C clutch field coil current reading is zero, the coil is open and must be replaced.
b. If the A/C clutch field coil current reading is above specifications, the coil is shorted and must be replaced.
A/C CLUTCH COIL SPECIFICATIONS
