PINPOINT TEST G531332p39 : CHECK THE AUXILIARY COOLANT PUMP FUNCTION

Pinpoint Tests

PINPOINT TEST G531332p39 : CHECK THE AUXILIARY COOLANT PUMP FUNCTION

G531332t173 : CHECK THE POWER SUPPLY TO THE AUXILIARY COOLANT PUMP
1. Key off.
2. Disconnect the auxiliary coolant pump electrical connector, CP02.
3. Key on, engine off.
4. Make sure the EMS relay is engaged.
5. Make sure the auxiliary coolant pump relay is engaged.
6. Measure the voltage between:

Auxiliary coolant pump Battery
connector CP02, harness side
Pin 02 Negative terminal

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between CP02, pin 02 and battery. This circuit includes fuse 17 of the front power distribution box, the auxiliary coolant pump relay and the EMS relay. CLEAR the DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G531332t174.

G531332t174 : CHECK THE AUXILIARY COOLANT PUMP GROUND
1. Measure the resistance between:

Auxiliary coolant pump Battery
connector CP02, harness side
Pin 01 Negative terminal

- Is the resistance greater than 5 ohms?

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

-> NO
INSTALL a new auxiliary coolant pump. CLEAR the DTC. TEST the system for normal operation.