1A-39 Engine General Information and Diagnosis:
Step Action Yes No
1 7) Disconnect the ECM coupler. Refer to “ECM Removal
and Installation in Section 1C (Page 1C-1)”.
8) Check the continuity between Y wire “B” and terminal
“14”.
Also, check the continuity between R wire “A” and
terminal “6”.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Continuity test ( )
ECM coupler (Harness side)
Is the continuity OK?
Go to Step 2. Y or R wire open, or Y
wire shorted to ground.
2 1) Correct the ECM coupler.
2) Turn the ignition switch ON.
3) Measure the input voltage between the R wire and
ground.
If OK, the 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 ( )
TP sensor input voltage
4.5 – 5.5 V
((+) terminal: R – (–) terminal: Ground, (+) terminal: R
– (–) terminal: B/Br)
In the voltage OK?
Go to Step 3. R and P/B wire open, or
P/B wire shorted to the
ground.
“14”
(A)
(B)
“A”
“B”
“6”
I831G1110038-03
(A)
V
I831G1110039-03
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