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 k
Ω
(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)
