Toyota 2GR-FE Manual page 781

CO–16
E1
CO
2GR-FE COOLING – COOLING FAN ECU
2
1
3
+B1
SI
A125060E02
COOLING FAN ECU
ON-VEHICLE INSPECTION
1. INSPECT COOLING FAN ECU
(a) Inspect the input voltage.
(1) Disconnect the cooling fan ECU connector.
(2) Turn the ignition switch on (IG). Check the
voltage of the +B terminal of the disconnected
wire harness side connector.
Standard voltage:
9 to 14 V
If the result is not as specified, inspect the
power source system (fusible link, fuse, wire
harness and relay).
(b) Inspect the cooling fan motor (see page CO-15).
(c) Measure the resistance between terminals RFC
(ECM) and SI (cooling fan ECU) of the wire harness
side connectors.
HINT:
• If the fan does not operate, there may be a short
circuit.
• If the fan remains operating, there may be an
open circuit.
(d) Inspect the ECM power source circuit and ground
circuit.