4-84 FI SYSTEM DIAGNOSIS
Step 1 (When indicating P1657-L:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the EXCVA position sensor coupler for loose or poor
contacts.
If OK, then check the EXCVA position sensor lead wire conti-
nuity.
4) Disconnect the EXCVA position sensor coupler.
5) Check the continuity between Yellow wire A and ground.
6) Also, check the continuity between Yellow wire A and B/Br
wire B. If the sound is not heard from the tester, the circuit
condition is OK.
7) Disconnect the ECM coupler.
8) Check the continuity between Yellow wire A and terminal 5.
9) Also, check the continuity between Red wire C and terminal
A.
EXCVA 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?
10)After repairing the trouble, clear the DTC using SDS tool.
(4-27)
1
1
]
YES Go to Step 2 and Go to Step 4.
NO
Red or Yellow wire open, or Yellow wire shorted to
ground
1
]
ECM coupler (Harness side)
(Black)
(Gray)
SAMPLE
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