Suzuki FL125S Service Manual page 325

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 (between Br/B wire B and G/B wire C).
! IAP sensor output voltage: 2.0 – 3.5 V at idle speed
$ 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
' Tester knob indication: Voltage (()
Is the voltage OK?
• G/B, R or Br/B wire open or shorted to ground,
or poor N, 9 or 4 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.
• Open or short circuit in the G/B wire.
NO • If the wire are OK, replace the IAP sensor
(throttle body assembly) with a new one.
%
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.
4) After repairing the trouble, clear the DTC using SDS tool.
(#8-39)
(+ G/B – - Br/B)
2
2
ECM coupler (Harness side)
FL125SDW 8-50
V