Engine Cooling System - Electrical Diagnostics: Overview Chrysler Crossfire I

DESCRIPTION

The Radiator Cooling Fan System is comprised of the Radiator Fan Control Module, Powertrain Control Module, and the Radiator Fan Motor. The Radiator Fan Control Module acts as the "relay" for the cooling fan circuit. The module is mounted to the inner fender. The Powertrain Control Module acts as the "input" to the module to command the fan operation. The radiator cooling fan is made up of a multiple bladed fan. The cooling fan motor is a high speed DC type.

OPERATION

The Radiator Cooling Fan is designed to keep the cooling system operating at a set temperature. The cooling fan operates when the engine coolant temperature exceeds 106 degrees Celsius or when the A/C has been requested on. The Powertrain Control Module sends an input to the Radiator Fan Control Module to activate the cooling fan. The Radiator Fan Control Module receives voltage from Fuse 2 (50 amp) in the Engine Fuse Block. The Radiator Fan Control Module is grounded through G100.

Scheme 1

For a complete Radiator Cooling Fan Circuit Diagram, (Refer to COOLING - SCHEMATICS AND DIAGRAMS) .

Scheme 2

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1. 1) ACTUATE RADIATOR COOLING FAN WITH DRB III(R) Turn the ignition on. With the DRB III(R), actuate the Radiator Cooling Fan. Is the Radiator Cooling Fan operating? Yes Replace the Powertrain Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-250625-S17957216692007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) . No Go to step 2) .
2. 2) CHECKING THE PCM FOR AN OPEN Turn the ignition off. Disconnect the Powertrain Control Module C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Turn the ignition on. Connect a jumper wire between ground and the Radiator Fan Control circuit at cavity 39 of the PCM C4 harness connector. Is the Radiator Cooling Fan operating? Yes Replace the Powertrain Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-250625-S17957216692007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) . No Go to step 3) .
3. 3) CHECKING THE FUSED B(+) CIRCUIT Turn the ignition off. Disconnect the Radiator Fan Control Module harness connector. NOTE: Check connectors - Clean/repair as necessary. Turn the ignition on. Measure the voltage of the Fused B(+) circuit at the Radiator Fan Control Module harness connector. Is the voltage above 11 volts? Yes Go to step 4) . No Repair the Fused B(+) circuit for an open. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
4. 4) CHECKING THE GROUND CIRCUIT Turn the ignition off. Measure the resistance between ground and the module Ground circuit. Is the resistance below 5.0 ohms? Yes Go to step 5) . No Repair the module Ground circuit for an open. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
5. 5) CHECKING THE RADIATOR FAN CONTROL CIRCUIT With the ignition off. Disconnect the Powertrain Control Module (PCM) C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the Radiator Fan Control circuit from the Radiator Fan Control Module harness connector to the PCM harness connector. Is the resistance below 5.0 ohms? Yes Go to step 6) . No Repair the Radiator Fan Control circuit for an open. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
6. 6) CHECKING THE RADIATOR FAN CONTROL MODULE OUTPUT CIRCUIT With the ignition off. Disconnect the Radiator Fan Motor harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance of the Radiator Fan Control Module Output circuit from the Radiator Fan Control Module harness connector to the Radiator Fan Motor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 7) . No Repair the Radiator Fan Control Module Output circuit for an open. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
7. 7) CHECKING THE RADIATOR FAN CONTROL MODULE GROUND CIRCUIT With the ignition off. Measure the resistance of the Radiator Fan Control Module Ground circuit from the Radiator Fan Control Module harness connector to the Radiator Fan Motor harness connector. Is the resistance below 5.0 ohms? Yes Go to step 8) . No Repair the Radiator Fan Control Module Ground circuit for an open. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
8. 8) CHECKING THE RADIATOR FAN MOTOR With the ignition off. Measure the resistance of the Radiator Fan Motor. Is the resistance below 5.0 ohms? Yes Replace the Radiator Fan Control Module. «(Refer to COOLING/ENGINE/PWM FAN CONTROL MODULE - REMOVAL)»(ref-250623-S34755163322007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) . No Replace the Radiator Fan Motor. «(Refer to COOLING/ENGINE/RADIATOR FAN - REMOVAL)»(ref-250623-S19590179442007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .

Scheme 10

For a complete Radiator Cooling Fan Circuit Diagram, (Refer to COOLING - SCHEMATICS AND DIAGRAMS) .

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1. 1) CHECKING DRB III(R) FOR A/C SWITCH STATUS Turn the ignition on. Insure that the A/C Switch is off. With the DRB III(R) in Inputs/Outputs, check the status of the A/C Switch. Does the DRB III(R) display Air Conditioning ON? Yes Repair the A/C Switch circuit. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) . No Go to step 2) .
2. 2) CHECKING THE RADIATOR FAN CONTROL MODULE OUTPUT CIRCUIT Turn the ignition off. Disconnect the Radiator Fan Control Module harness connector. Disconnect the Radiator Fan Motor harness connector. NOTE: Check connectors - Clean/repair as necessary. Turn the ignition on. Measure the voltage on the Radiator Fan Control Module Output circuit. Is the voltage below 1.0 volt? Yes Go to step 3) . No Repair the Radiator Fan Control Module Output circuit for a short to voltage. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
3. 3) CHECKING THE RADIATOR FAN CONTROL CIRCUIT Turn the ignition off. Disconnect the Powertrain Control Module (PCM) C4 harness connector. NOTE: Check connectors - Clean/repair as necessary. Measure the resistance between ground and the Radiator Fan Control circuit. Is the resistance above 100 kohms? Yes Go to step 4) . No Repair the Radiator Fan Control circuit for a short to ground. Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .
4. 4) CHECKING THE POWERTRAIN CONTROL MODULE With the ignition off. Reconnect the PCM C4 harness connector. Measure the resistance between ground and the Radiator Fan Control circuit at the Radiator Fan Control Module harness connector. Is the resistance above 100 kohms? Yes Replace the Radiator Fan Control Module. «(Refer to COOLING/ENGINE/PWM FAN CONTROL MODULE - REMOVAL)»(ref-250623-S34755163322007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) . No Replace the Powertrain Control Module. «(Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWERTRAIN CONTROL MODULE - REMOVAL)»(ref-250625-S17957216692007031500000) Perform «POWERTRAIN VERIFICATION TEST - VER 3»(ref-250650-S34838051282007031500000) .