Engine General Information and Diagnosis: 1A-46
C15 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Check the ECT sensor coupler for loose or poor
contacts.
If OK, then measure the ECT sensor input voltage at the
wire side coupler.
3) Disconnect the coupler and turn the ignition switch ON.
4) Measure the input voltage between the B/Bl wire
terminal and ground.
If OK, then measure the input voltage between the B/Bl
wire terminal and B/Br wire terminal.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
ECT sensor input voltage
4.5 – 5.5 V
((+) terminal: B/Bl – (–) terminal: Ground, (+)
terminal: B/Bl – (–) terminal: B/Br)
Is the voltage OK?
Go to Step 3. • Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the B/Bl or B/Br
wire.
I718H1110174-02
(A)
I718H1110048-03
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