Engine General Information and Diagnosis: 1A-74
C29 (Use of mode select switch)
Step Action Yes No
1 1) Turn the ignition switch OFF.
2) Remove the air cleaner box. Refer to “Air Cleaner Box
Removal and Installation in Section 1D (Page 1D-6)”.
3) Check the STP sensor coupler (1) for loose or poor
contacts.
If OK, then measure the STP sensor input voltage.
4) Disconnect the STP sensor coupler.
5) Turn the ignition switch ON.
6) Measure the input voltage between the R wire “A” and
ground.
Also, measure the voltage between the R wire “A” and B/
Br wire “B”.
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 2. Open circuit in the R
wire or B/Br wire.
1
I944H1110062-02
“A”
“B”
(A)
I822H1110064-01
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