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4-64 FI SYSTEM DIAGNOSIS
Step 1 (When indicating P1651-H:)
1) Turn the ignition switch OFF.
2) Remove the frame cover. (8-8)
3) Check the TO sensor coupler 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 R wire A and B 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 B wire B and terminal L.
8) Also, check the continuity between B/Br wire
C
and terminal
S
.
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.
(4-27)
1
1
!
When using the multi-circuit tester, do not storongly
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 B wire shorted to VCC, or B/Br wire open.
1
!
(Black)
(Gray)
ECM couplers (Harness side)