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"C29"
STP SENSOR CIRCUIT MALFUNCTION
FI
SYSTEM
DIAGNOSIS
4-47
DETECTED CONDITION POSSIBLE CAUSE
Signal voltage low or high.
• STP sensor maladjusted.
Difference between actual throttle opening and
• STP sensor circuit open or short.
opening calculated by ECM in larger than specified
• STP sensor malfunction.
value.
• ECM malfunction.
0.15 V
~ Sensor voltage < 4.85 V
(without the above range.)
INSPECTION
Step 1
1)
Lift and support the fuel tank with its prop stay.
(c:::::T'5-5)
2) Turn the ignition switch OFF.
3) Check the STP sensor coupler 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 voltage at the Red wire and ground.
If OK, then measure the voltage at the Red wire and B/Br
wire.
_ STP
sensor
input
voltage:
4.5 - 5.5 V
(@ Red - 8
Ground)
(@ Red - 8 B/Br)
,root.
09900-25008:
Multi
circuit
tester
set
~
Tester
knob
indication:
Voltage
(:-:-::)
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler.
NO
• Open or short circuit in the Red wire or B/Br
wire.