C29" Stp Sensor Circuit Malfunction - Suzuki DL650 Service Manual

4-38 FI SYSTEM DI A GNOSI S
"C29" STP SENSOR CIRCUIT MALFUNCTION
I
DETECTED CONDITION
- -
voltage is out of the specified range.
Difference between actual throttle opening and
opening calculated by ECM in larger than specified
I
value.
10.1 V 5 Sensor voltage 5 4.8 V
INSPECTION
Step 1
1) Remove the air cleaner box. (-5-1 5)
2) Turn the ignition switch OFF.
POSSIBLE CAUSE
STP sensor maladjusted.
STP sensor circuit open or short.
STP sensor malfunction.
ECM malfunction.
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.
7) If OK, then measure the voltage at the Red wire and BIBr
wire.
STP sensor input voltage: 4.5
-
5.5 V
(@ Red
-
@
Ground)
(@ Red
-
@
BIBr)
@
09900-25008: Multi circuit tester set
l u
Tester knob indication: Voltage (=)
Is the voltage OK?
Loose or poor contacts on the ECM coupler.
Open or short circuit in the Red wire or B/Br
wire.