Suzuki VLR1800 Service Manual page 142

1A-73 Engine General Information and Diagnosis:
Step
1 6) Disconnect the ECM coupler. Refer to "ECM Removal
and Installation in Section 1C (Page 1C-1)".
7) Check the continuity between the Y/W wire "A" and
terminal "20".
Also, check the continuity between the R wire "C" and
terminal "11".
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity (
ECM couplers (Harness side)
"C"
(B)
"20"
Is the continuity OK?
2 1) Connect the ECM coupler.
2) Turn the ignition switch ON.
3) Measure the input voltage between the R wire "C" and
ground.
Also, measure the input voltage between the R wire "C"
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)
"B"
Is the voltage OK?
Action
)
"A"
(A)
"11"
(Gray)
(Black)
"C"
Yes
Go to Step 2.
I822H1110070-02
Go to Step 3.
(A)
I822H1110071-01
No
R or Y/W wire open, or
Y/W wire shorted to
ground.
Open or short circuit in
the R or B/Br wire.