Engine General Information and Diagnosis: 1A-80
1 7) Check the continuity between the Y/W wire and terminal
“20”. Also, check the continuity between the R wire and
terminal “11”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test ( )
ECM couplers (Harness side)
Is the continuity OK?
Go to Step 2. R or Y/W wire open, or
Y/W wire shorted to the
ground.
2 1) Connect the ECM coupler.
2) Turn the ignition switch ON.
3) Measure the input voltage between the R wire and
ground. Also, measure the input voltage between the R
wire and B/Br wire.
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 3. Open or short circuit in
the R or B/Br wire.
Step Action Yes No
(Black)
(Gray)
(A)
(B)
“20”
“11”
I823H1110068-04
V
(A)
I823H1110069-05
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