Test Procedure

KF1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)

Is DTC P0480 present?

Yes	No
GO to KF2.	For electric cooling fan always on, GO to KF4. For electric cooling fan does not operate, GO to KF2. For all others, RETURN to SYMPTOM CHARTS for further direction.

KF2 CHECK FOR A MECHANICAL CONCERN WITH THE COOLING FAN MOTOR OR FOR OBSTRUCTIONS LIMITING THE COOLING FAN MOTOR OPERATION

Ignition OFF.
CF Module connector disconnected.
Rotate the fan by hand. The fan should rotate freely, with no abnormal binding. If binding is present, remove any foreign materials or install a new fan assembly as required.
Ignition ON, engine OFF.

Measure the voltage between:

(+) CF Module Connector, Harness Side	(-) CF Module Connector, Harness Side
VPWR - Pin 1	GND - Pin 2

Is the voltage greater than 10.5 V?

Yes	No
GO to KF4.	GO to KF3.

KF3 CHECK THE VOLTAGE TO THE FAN MOTOR USING GROUND AS A REFERENCE

Measure the voltage between:

(+) CF Module Connector, Harness Side	(-)
VPWR - Pin 1	Ground

Is the voltage greater than 10.5 V?

Yes	No
REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.	CHECK the condition of the related fuse/fuse links. If OK, REPAIR the open circuit. If the fuse/fuse link is damaged, CHECK the circuit for a short to ground before installing a new fuse/fuse link.

KF4 CHECK THE FCV CIRCUIT

Ignition OFF.
Connect the 1.6K ohms resistor between the FCV and VPWR circuits at the CF module harness connector (this simulates cooling fan circuitry).
Ignition ON, engine OFF.
Carry out the PCM KOEO self-test.

Is DTC P0480 present?

Yes	No
GO to KF6.	GO to KF5.

KF5 CHECK THE COOLING FAN MOTOR OPERATION

NOTE: Both 30 amp fused jumper wires should be connected to the wiring harness that directly connects to the cooling fan motor.

NOTE: Allow the cooling fan to operate for a minimum of two minutes and observe for any noise or binding.

NOTE: With the cooling fan motor disconnected voltage may not be present at the cooling fan module. Do not measure voltage at the cooling fan motor.

CF Motor connector disconnected.
Connect a 30 amp fused jumper wire between the VPWR circuit at the CF motor connector harness side and the vehicle battery positive terminal side.
Connect a 30 amp fused jumper wire between the GND circuit at the CF motor connector harness side and the vehicle battery negative terminal side.

Does the cooling fan motor operate correctly?

Yes	No
INSTALL a new CF module. REFER to the Engine Cooling article. Clear the PCM DTCs. REPEAT the self-test.	INSTALL a new CF motor. REFER to the Engine Cooling article. Clear the PCM DTCs. REPEAT the self-test.

KF6 CHECK FOR AN OPEN CIRCUIT BETWEEN THE PCM AND FAN MOTOR

Ignition OFF.
PCM connector disconnected.

Measure the resistance between:

(+) PCM Connector, Harness Side	(-) CF Module Connector, Harness Side
FCV - Pin B13	FCV - Pin 4

Is the resistance less than 5 ohms?

Yes	No
GO to KF7.	REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.

KF7 CHECK THE FCV CIRCUIT FOR A SHORT TO GROUND

Measure the resistance between:

(+) CF Module Connector, Harness Side	(-)
FCV - Pin 4	Ground

Is the resistance greater than 10K ohms?

Yes	No
GO to KF8.	REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.

KF8 CHECK THE FCV CIRCUIT FOR A SHORT TO VOLTAGE

Ignition ON, engine OFF.

Measure the voltage between:

(+) CF Module Connector, Harness Side	(-)
FCV - Pin 4	Ground

Is any voltage present?

Yes	No
REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.	GO to KF9.

KF9 CHECK THE B+ AND GND CIRCUIT FOR AN INTERMITTENT CONCERN

Ignition OFF.

Connect a non-powered test lamp between:

Point A CF Module Connector, Harness Side	Point B CF Module Connector, Harness Side
VPWR - Pin 1	GND - Pin 2

Ignition ON, engine OFF.
Observe the test lamp for an indication of a concern while carrying out the following. Note that the lamp turns off when a concern is present.
- Shake, wiggle, and bend the VPWR and GND circuits to the CF.
- Shake, wiggle, and tap the associated fuse.

Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to KF10.

KF10 CHECK THE FCV CIRCUIT FOR AN INTERMITTENT CONCERN

Ignition OFF.
Connect the 1.6K ohms resistor between the FCV and VPWR circuits at the CF module harness connector (this simulates cooling fan circuitry).

Measure the voltage between:

(+) CF Module Connector, Harness Side	(-)
FCV - Pin 4	Ground

Ignition ON, engine OFF.
Access the PCM and control the FAN_DSD (PER) PID.
Command the fan full ON.
Observe the digital multimeter (DMM) for an indication of a concern while shaking, wiggling, and bending the FCV circuit between the CF module and the PCM. Note that voltage changes suddenly when a concern is detected.

Is a concern present?

Yes	No
ISOLATE the concern and REPAIR as necessary. Clear the PCM DTCs. REPEAT the self-test.	GO to KF11.

KF11 CHECK FOR CORRECT PCM OPERATION

Disconnect all the PCM connectors.
Visually inspect for:
- pushed out pins
- corrosion
Connect all the PCM connectors and make sure they seat correctly.
Carry out the PCM self-test.
Verify the concern is still present.

Is the concern still present?

Yes	No
INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM.	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.