Engine General Information and Diagnosis: 1A-77
2 1) Connect the ECM coupler and TO sensor coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Turn the ignition switch ON.
4) Measure the voltage at the wire side coupler between B
wire and B/Br wire.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
Tester knob indication
Voltage ( )
TO sensor voltage (Normal)
0.4 – 1.4 V
((+) terminal: B – (–) terminal: B/Br)
5) Dismount the TO sensor from its bracket and measure
the voltage when it is leaned 65° and more, left and right,
from the horizontal level.
Special tool
(A): 09900–25008 (Multi-circuit tester set)
(B): 09900–25009 (Needle pointed probe set)
TO sensor voltage (Leaning)
3.7 – 4.4 V
((+) terminal: B – (–) terminal: B/Br)
Is the voltage OK?
• R, B or B/Br wire
open or shorted to
ground, or poor “7”,
“31” or “35”
connection.
• If wire and
connection are OK,
intermittent trouble or
faulty ECM.
• Recheck each
terminal and wire
harness for open
circuit and poor
connection.
• Replace the ECM
with a known good
one, and inspect it
again. Refer to “ECM
Removal and
Installation in Section
1C (Page 1C-1)”.
• Loosen or poor
contacts on the ECM
coupler.
• Open or short circuit.
• Replace the TO
sensor with a new
one. Refer to “TO
Sensor Removal and
Installation in Section
1C (Page 1C-6)”.
Step Action Yes No
(A)
(B)
I837H1110054-01
(A)
(B)
I837H1110055-01
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