Toyota Sienna Service Manual: 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 to the ON position.
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-19).
(c) Measure the resistance between terminals RFC (ECM) and SI (cooling fan ECU) of the wire harness side connectors.V
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.
Cooling fan motor
On-vehicle inspection
1. No. 1 Cooling fan motor
(A) check that the motor turns smoothly when the
battery is connected to the fan motor connector.
(B) measure the current while the motor is ...
Cooling fan relay
On-vehicle inspection
1. Cooling fan relay
(a) Remove the relay from engine room relay block No.
1.
(b) Measure the resistance of the relay.
Standard resistance
If the result is not as ...
Other materials:
Gateway ECU Communication Stop Mode
DESCRIPTION
Detection Item
Symptom
Trouble Area
Gateway ECU
Communication Stop
Mode
"Gateway" is not displayed on the "Communication
Bus Check" screen of the intelligent tester
Applies to "Gateway ECU Communication ...
Removal
1. PRECAUTION
CAUTION: Be sure to read "PRECAUTION" thoroughly before
servicing.
2. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait for 90 seconds after disconnecting the cable to
prevent the airbag working.
3. REMOVE STEERING WHEEL NO.3 COVER LOWER
Using a ...
Fuel Pump Primary Circuit
DESCRIPTION
This DTC is designed to detect a malfunction in the fuel pump (FUEL
PUMP) relay circuit. When the
system is normal, the battery voltage is applied to FPR terminal of the ECM
while the FUEL PUMP
relay is turned OFF. If the battery voltage is not applied to the FPR
ter ...
