Ect Sensor Circuit Malfunction - TGB BLADE 600 Service Manual

ECT SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Output voltage is not within the following
range.
0.1 Sensor voltage < 4.6 V
Sensor voltage is higher than specified
value.
Sensor voltage is lower than specified value.
INSPECTION
Step 1
(When output voltage is out of specified)
1) Turn the ignition switch OFF.
2) Check the ECT sensor coupler for loose or
poor contacts.
If OK, then measure the ECT sensor voltage
at the wire side coupler.
3) Disconnect the ECT sensor coupler and turn
the ignition switch ON.
4) Measure the voltage between Y/R wire
terminal and ground.
5) Also, measure the voltage between Y/R wire
terminal and Gr/R wire terminal.
ECT sensor input voltage: 4.5 – 5.5 V
(+Y/R – - Ground)
(+Y/R – - Gr/R)
4-1. FUEL INJECTION SYSTEM
POSSIBLE CAUSE
• ECT sensor circuit open or short
• ECT sensor malfunction
• ECU malfunction
• ECT sensor circuit open or ground circuit
open
• ECT sensor circuit shorted to ground
4-1-39