Suzuki Intruder VZR1800 Service Manual page 279

Step 1 (When indicating P1657-L:)
1) Turn the ignition switch OFF.
2) Remove the lower frame cover. (#7-8)
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. (#5-37)
8) Check the continuity between Yellow wire A and terminal 5.
9) Also, check the continuity between Red wire C and terminal
A.
"
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.
$ 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?
YES Go to Step 2 and Go to Step 4.
Red or Yellow wire open, or Yellow wire shorted to
NO
ground
10)After repairing the trouble, clear the DTC using SDS tool.
(#5-26)
FI SYSTEM DIAGNOSIS
1
1
1
(Black)
ECM coupler (Harness side)
5-85
(Gray)