Engine General Information and Diagnosis: 1A-78
C29 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Check the STP sensor coupler for loose or poor
contacts.
If OK, then measure the STP sensor input voltage.
3) Disconnect the STP sensor coupler.
4) Turn the ignition switch ON.
5) Measure the voltage at the R wire and ground. Also,
measure the voltage at the R wire and B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
Tester knob indication
Voltage ( )
STP sensor input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
Is the voltage OK?
Go to Step 4. • Loose or poor
contacts on the ECM
coupler.
• Open or short circuit
in the R wire or B/Br
wire.
I718H1110253-01
(A)
I718H1110197-02
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