PINPOINT TEST G531332p19 : RADIATOR COOLING FAN MODULE DRIVE CIRCUIT MALFUNCTION

Pinpoint Tests

PINPOINT TEST G531332p19 : RADIATOR COOLING FAN MODULE DRIVE CIRCUIT MALFUNCTION

G531332t73 : CHECK THE RADIATOR FAN MODULE PERMANENT SUPPLY
1. Disconnect the fan module electrical connector, GCU04.
2. Measure the voltage between:

Fan module connector Battery
GCU04, harness side
Single pin Negative terminal

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between the cooling fan module and battery. This circuit includes fuse 35 of the front power distribution box (80A). CLEAR the DTC. TEST the system for normal operation.

-> NO
Reconnect electrical connector, GCU04. GO to Pinpoint Test G531332t74.

G531332t74 : CHECK THE RADIATOR FAN MODULE GROUND
1. Disconnect the fan module electrical connector, GCU03.
2. Measure the resistance between:

Fan module connector Battery
GCU03, harness side
Single pin Negative terminal

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
Reconnect electrical connector, GCU03. GO to Pinpoint Test G531332t75.

G531332t75 : CHECK THE RADIATOR FAN MODULE EMS SWITCHED SUPPLY
1. Disconnect the fan module electrical connector, GCU01.
2. Key on, engine off.
3. Make sure the EMS relay is engaged.
4. Measure the voltage between:

Fan module connector Battery
GCU01, harness side
Pin 02 Negative terminal

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between the cooling fan module and battery. This circuit includes the front power distribution box, (fuse 14) and the EMS control relay. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t76.

G531332t76 : CHECK THE ECM TO RADIATOR FAN MODULE CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Measure the resistance between:

Fan module connector ECM connector PI300,
GCU01, harness side harness side
Pin 01 Pin 49

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t77.

G531332t77 : CHECK THE ECM TO RADIATOR FAN MODULE CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Key on, engine off.
2. Measure the voltage between:

Fan module connector Battery
GCU01, harness side
Pin 01 Negative terminal

- Is the voltage greater than 3 volts?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t78.

G531332t78 : CHECK THE ECM TO RADIATOR FAN MODULE CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

Fan module connector Battery
GCU01, harness side
Pin 01 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> NO
INSTALL a new radiator cooling fan module. CLEAR the DTC. TEST the system for normal operation.