FI SYSTEM DIAGNOSIS 4-93
4) Turn the ignition switch ON.
5) Check the operation of the EXCVA .
(EXCVA operating order: Full close → Full open → 30% open)
Is the operation OK?
Step 1 (When indicating P1657-H:)
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 R wire and Y wire .
If the sound is not heard from the tester, the circuit condition
is OK.
6) Disconnect the ECM coupler.
7) Check the continuity between Y wire and terminal %.
8) Also, check the continuity between B/Br wire and terminal
:.
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?
9) After repairing the trouble, clear the DTC using SDS tool.
(4-28)
YES Go to Step 2.
NO Go to Step 6.
1
1
1
YES Go to Step 4.
NO Y wire shorted to VCC, or B/Br wire open
ECM coupler (Harness side)
(Black)
1
(Gray)
?
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