Suzuki TU250X Service Manual page 153

4-32 FI SYSTEM DIAGNOSIS
3) Disconnect the IAP sensor coupler.
4) Turn the ignition switch ON.
5) Insert the needle-point probes to the lead wire coupler.
6) Measure the voltage at the R wire and ground.
7) If OK, then measure the voltage at the R wire and B/Br wire.
 IAP sensor input voltage: 4.5 – 5.5 V
 09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal A or T).
NO
• Open or short circuit in the R wire or B/Br wire.
Step 1 (When indicating P0105-H:)
1) Turn the ignition switch OFF.
2) Check the IAP sensor coupler for loose or poor contacts.
If OK, then check the IAP sensor lead wire continuity.
3) Disconnect the IAP sensor coupler.
4) Check the continuity between R wire and W/Bl wire.
If the sound is not heard from the tester, the circuit condition
is OK.
(+ R – - Ground)
(+ R – - B/Br)
1
1
1
V