Turbocharger Coolant Pump: Testing and Inspection

WORK SEQUENCE
- Run engine until radiator cooling fan switches ON at HIGH speed
- Turn OFF engine and wait five minutes
- After approx. five minutes, secondary coolant pump and radiator cooling fan must switch ON

NOTE: Radiator cooling tan will run on LOW speed.

If Coolant Pump And Radiator Fan DO NOT Run:
- Remove harness connector from secondary coolant pump thermo-switch and bridge terminals
- Coolant pump and radiator fan must run

IF YES:
- Replace secondary coolant pump thermo-switch

IF NO:
- Check for open circuit in coolant pump circuit using wiring diagram