Suzuki TU250X Service Manual page 167

4-46 FI SYSTEM DIAGNOSIS
4) Disconnect the coupler and turn the ignition switch ON.
5) Measure the voltage between Y/R wire terminal and ground.
6) If OK, then measure the voltage between Y/R wire terminal
and B/Br wire terminal.
 IAT sensor input voltage: 4.5 – 5.5 V
 09900-25008: Multi circuit tester set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal 5 or T)
NO
• Open or short circuit in the Y/R wire or B/Br
wire
Step 1 (When indicating P0110-H:)
1) Turn the ignition switch OFF.
2) Remove the fuel tank. (5-3)
3) Check the IAT sensor coupler for loose or poor contacts.
If OK, then check the IAT sensor lead wire continuity.
4) Disconnect the IAT sensor coupler and ECM coupler.
5) Check the continuity between Y/R wire A and terminal 5.
6) Also, check the continuity between B/Br wire B and terminal
T.
 IATS 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 2.
NO Y/R wire or B/Br wire open
(+ Y/R – - Ground)
(+ Y/R – - B/Br)
1
1
1
ECM coupler (Harness side)
V
!