Suzuki GSX-R750 Service Manual page 224

4-68 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch OFF.
2) Disconnect the STVA lead wire coupler.
3) Check the continuity between each terminal and ground.
 STVA continuity: ∞ Ω (Infinity)
4) If OK, then measure the STVA resistance (between terminal
A and terminal B) and (between terminal C and terminal
D).
 STVA resistance: Approx. 7.0 Ω
 09900-25008: Multi-circuit tester set
 Tester knob indication: Resistance (Ω)
Is the resistance OK?
• W/B, P/W, G and B/Lg wire open or shorted to
ground, or poor 1, 2, H and I connection
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
YES
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
• Loose or poor contacts on the ECM coupler.
NO
• Replace the STVA with a new one.

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.
5) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
(Terminal – Ground)
(Terminal A – Terminal B)
(Terminal C – Terminal D)
2
2
2
ECM couplers (Harness side)
(Black) (Gray)