4-48 FI SYSTEM DIAGNOSIS
Step 1 (When indicating P1651-H:)
1) Turn the ignition switch OFF.
2) Remove the front leg shield. (#8-6)
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.
5) Check the continuity between O/Bl wire

A and Lg wire

B.
If the sound is not heard from the tester, the circuit condition is
OK.
6) Disconnect the ECM coupler.
7) Check the continuity between Lg wire

B and terminal

3.
8) Also, check the continuity between B wire

C and terminal

J.
$ TOS 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?
9) After repairing the trouble, clear the DTC using SDS tool.
(#4-26)
1
1
]
When using the multi-circuit tester, do not strongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
YES Go to Step 2.
NO Lg wire shorted to VCC, or B wire open.
ECM coupler (Harness side)
1
]
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