Suzuki VZR1800 2007 Service Manual page 266

Step 3
1) Turn the ignition switch OFF.
2) Disconnect the STP sensor coupler and install the test har-
ness.
3) Disconnect the STVA lead wire coupler.
4) Turn the ignition switch ON.
5) Measure the STP sensor output voltage at the terminals
(between + terminal A Y/W wire and - terminal C B/Br
wire) by turning the secondary throttle valve (close and open)
with a finger.
$ STP sensor output voltage
Secondary throttle valve is closed: Approx. 0.6 V
Secondary throttle valve is opened: Approx. 4.2 V
! 09900-25008: Multi-circuit tester set
09900-28630: TPS test wire harness
& Tester knob indication: Voltage (')
Is the voltage OK?
• Red, Y/W or B/Br wire open or shorted to
ground, or poor A, J or S connection
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
YES
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
If check result is not satisfactory, replace STP
NO
sensor with a new one.
After repairing the trouble, clear the DTC using SDS tool.
(#5-26)
FI SYSTEM DIAGNOSIS
3
V
3
3
3
ECM coupler (Harness side)
(Black)
5-65
(Gray)