COMMON RAIL SYSTEM
V3800-CR-TE4,V3800-CR-TIE4, DM
1-S158
2. Measure the Resistance Between Terminals
1. Place the key switch in the OFF position, unplug the ECU wiring
harness connector from the socket, and measure the resistance
between terminals A-15 and A-39 of the connector.
9Y1200192CRS0688US0
3. Check the Sensor
1. Turn the key switch OFF, remove the connector from the sensor
side and measure the resistance between the terminals on the
sensor side.
9Y1200192CRS0260US0
4. Measure the ECU Terminal Voltage
1. Plug the ECU wiring harness connector into socket again,
unplug the sensor connector, and measure the voltage between
ECU terminals A-15 and A-39 at the ECU side.
9Y1200192CRS0689US0
Factory specification
Temperature
Resistance
20 °C (68 °F)
Approx. 2.5 k
Ω
40 °C (104 °F)
Approx. 1.2 k
Ω
60 °C (140 °F)
Approx. 0.58 k
Ω
80 °C (176 °F)
Approx. 0.32 k
Ω
100 °C (212 °F)
Approx. 0.18 k
Ω
OK
Go to "4. Measure the ECU Terminal Voltage".
NG
Go to "3. Check the sensor".
Factory specification
Temperature
Resistance
20 °C (68 °F)
Approx. 2.5 k
Ω
40 °C (104 °F)
Approx. 1.2 k
Ω
60 °C (140 °F)
Approx. 0.58 k
Ω
80 °C (176 °F)
Approx. 0.32 k
Ω
100 °C (212 °F)
Approx. 0.18 k
Ω
OK
Wiring harness open circuit or connector fault
→
Check and repair.
NG
Coolant temperature sensor fault
→
Replace the coolant temperature
sensor.
(1) Coolant Temperature Sensor
Factory
specification
Approx. 5 V
OK
The ECU connector is faulty or its wiring harness is shorted.
NG
Confirm by using other sensors that there is no ground short malfunction
before replacing the ECU.
KiSC issued 05, 2012 A