Suzuki GSX-R750 Service Manual page 197

7) Disconnect the ECM coupler.
8) Check the continuity between R wire A and terminal A.
9) Also, check the continuity between G/B wire C and terminal
9.
 IAPS lead wire continuity: Continuity ()
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Continuity test ()

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.
Is the continuity OK?
YES Go to Step 1 (4-38) and go to Step 2.
NO R or G/B wire open, or G/B wire shorted to ground
10)After repairing the trouble, clear the DTC using SDS tool.
(4-27)
Step 2
1) Connect the IAP sensor coupler and ECM coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Start the engine at idle speed and measure the IAP sensor
output voltage at the wire side coupler (between G/B and
B/Br wires).
 IAP sensor output voltage: Approx. 2.7 V at idle speed
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 3.
• Check the vacuum hose for crack or damage.
• Open or short circuit in the G/B wire
NO
• If vacuum hose and wire are OK, replace the
IAP sensor with a new one.
4) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
(+ G/B – - B/Br)
FI SYSTEM DIAGNOSIS
1
(Black)
ECM couplers (Harness side)
2
4-41
!
(Gray)
V