Suzuki RM-Z250 Service Manual page 215

12-32 FI SYSTEM DIAGNOSIS
5) Measure the voltage at the R/Bl wire A and ground.
6) If OK, then measure the voltage at the R/Bl wire A and B/Br
wire B.
 TP sensor input voltage: 4.5 – 5.5 V
 09900-25008: Multi circuit tester set
36890-28H00: Battery lead wire (option)
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal C or N).
NO
• Open or short circuit in the R/Bl wire or B/Br
wire.
Step 1 (When indicating P0120-H:)
1) Stop the engine.
2) Check the TP sensor coupler 1 for loose or poor contacts.
If OK, then check the TP sensor lead wire continuity.
3) Disconnect the TP sensor coupler.
4) Remove the fuel tank. (13-2, -3)
5) Disconnect the ECM coupler. (12-60)
6) Check the continuity between R/Bl wire A and Yellow wire
C.
If the sound is not heard from the tester, the circuit condition
is OK.
(+ R/Bl – - Ground)
(+ R/Bl – - B/Br)
1
1
1
V