Suzuki TU250X Service Manual page 155

4-34 FI SYSTEM DIAGNOSIS
6) Disconnect the ECM coupler.
7) Check the continuity between R wire C and terminal A.
8) Also, check the continuity between W/Bl wire A and terminal
7.
 IAPS lead wire continuity: Continuity ()
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Continuity test ()
Is the continuity OK?
YES Go to Step 1 (4-31) and go to Step 2.
R wire or W/Bl wire open, or W/Bl wire shorted to
NO
ground
Step 2
1) Connect the IAP sensor coupler and ECM coupler.
2) Insert the needle-point 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 W/Bl and
B/Br wires).
 IAP sensor output voltage: 1.5 – 3.5 V at idle speed
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 3.
• Open or short circuit in the W/Bl wire
NO • If wire are OK, replace the IAP sensor with a
new one.
(+ W/Bl – - B/Br)
1
ECM coupler (Harness side)
2
!