FI SYSTEM DIAGNOSIS 12-49
4) Remove the TO sensor.
5) Measure the resistance between terminal A and terminal B.
TO sensor resistance: 16.5 – 22.3 kΩ
(Terminal A – Terminal B)
09900-25008: Multi circuit tester set
Tester knob indication: Resistance (Ω)
Is the resistance OK?
Step 1 (When indicating P1651-H:)
1) Stop the engine.
2) Remove the fuel tank. (13-2, -3)
3) Check the TO sensor coupler 1 for loose or poor contacts.
If OK, then check the TO sensor lead wire continuity.
4) Disconnect the TO sensor coupler and ECM coupler.
5) Check the continuity between R/Bl wire A and Br/W wire C.
If the sound is not heard from the tester, the circuit condition
is OK.
6) Insert the needle-pointed probes to the lead wire coupler.
7) Check the continuity between Br/W wire C and terminal 2.
8) Also, check the continuity between B/Br wire B and terminal
N.
TO sensor lead wire continuity: Continuity ()
09900-25008: Multi circuit tester set
09900-25009: Needle-pointed probe set
Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 2.
NO Replace the TO sensor with a new one.
1
1
1
]
YES Go to Step 2.
NO Br/W wire shorted to VCC, or B/Br wire open.
1
]
ECM coupler (Harness side)
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