TGB EST 1000, Service Manual

Page: 73 / 269

4-2. FUEL INJECTION SYSTEM
4-2-35
6) Connect the ECT sensor coupler.
7) Turn the ignition switch ON.
8) Measure the voltage between Y/R wire and
ground.
Output voltage: 0.1
–
4.6 V
(+ Y/R
–
- Ground)
Are the continuity and voltage OK?
YES Go to step 2
NO Y/R wire shorted to ground.
9) After repairing the trouble, clear the DTC
using Diagnosis tool.
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the ECT sensor coupler.
3) Measure the ECT sensor resistance.
ECT sensor resistance:
Approx. 2.3
–
2.6 k
Ω
at 20
°
C (68
°
F)
(Terminal
–
Terminal)
Is the resistance OK?
YES
•
Y/R or Gr/R wire open or shorted to
ground, or poor 42 or 27 connection
•
If wire and connection are OK,
intermittent trouble or faulty ECU.
•
Recheck each terminal and wire
harness for open circuit and poor
connection.
•
Replace the ECU with a known
good one, and inspect it again.
NO Replace ECT sensor with a new one.
4) After repairing the trouble, clear the DTC
using Diagnosis tool.
ECT sensor specification
Engine Coolant
Temperature
Resistance
20
°
C (68
°
F) Approx. 2.45 k
Ω
40
°
C (104
°
F) Approx. 1.148 k
Ω
60
°
C (140
°
F) Approx. 0.587 k
Ω
80
°
C (176
°
F) Approx. 0.322 k
Ω
42
27