PINPOINT TEST G542831p37

PINPOINT TEST G542831p37 : CHECK THE AUXILIARY COOLANT PUMP FUNCTION

G542831t137 : 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 energized.
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 the auxiliary coolant pump and battery. This circuit includes fuse 36 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 G542831t138.

G542831t138 : 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.