Radiator Cooling Fan System Test (Supra Turbo - 2JZ-GTE)

1. Ensure engine coolant temperature is less than 196°F (91°C). Turn ignition on. Ensure radiator cooling fan stops.
2. If radiator cooling fan stops, proceed to step 5). If radiator cooling fan continues to operate, check cooling fan relays No. 1 and 2 and Engine Coolant Temperature (ECT) switch. See COOLING FAN RELAY NO. 1, COOLING FAN RELAY NO. 2 and ENGINE COOLANT TEMPERATURE (ECT) SWITCH under COMPONENT TESTING .
   NOTE: Cooling fan relay No. 1 may also be referred to as radiator fan relay. Cooling fan relay No. 2 may also be referred to as ABS TRAC relay.
3. If cooling fan relays No. 1 and 2, and ECT switch are okay, check for open circuit in wire between ECT switch and cooling fan relay No. 1. See WIRING DIAGRAMS .
4. Cooling fan relay No. 1 is located at driver's side front corner of engine compartment. See Fig 1. The ECT switch is located in the lower driver's side of radiator.
5. With ignition on, disconnect electrical connector at Engine Coolant Temperature (ECT) switch, located in lower driver's side of radiator. Ensure radiator cooling fan operates.
6. If radiator cooling fan operates, proceed to step 8). If radiator cooling fan does not operate, check cooling fan relays No. 1 and 2, radiator cooling fan and necessary fuses. See WIRING DIAGRAMS . See COOLING FAN RELAY NO. 1, COOLING FAN RELAY NO. 2 and RADIATOR COOLING FAN under COMPONENT TESTING .
7. If all components are okay, check for short circuit in wire between cooling fan relay No. 1 and ECT switch. See WIRING DIAGRAMS .
8. Install electrical connector on ECT switch. Start engine. Warm engine until coolant temperature is greater than 212°F (100°C). Ensure radiator cooling fan operates. Replace ECT switch if radiator cooling fan fails to operate. Retest system.

Fig 1: Identifying Relay Locations (Supra Turbo)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002