Suzuki RM-z450 Owner's Service Manual page 201

5) Connect a 12 volts battery using the battery lead wire to ser-
vice coupler. ("12-22)
6) Insert the needle pointed probes to the lead wire coupler.
7) Measure the voltage at the R/Bl wire and ground.
8) If OK, then measure the voltage at the R/Bl wire and B/Br
wire.
# IAP sensor input voltage: 4.5 – 5.5 V
! 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe 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 2
1) Connect the IAP sensor coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Kickstart the engine at idle speed.
4) Measure the IAP sensor output voltage at the wire side cou-
pler (between G/B and B/Br wires).
# IAP sensor output voltage: 0.98 – 2.86 V at idle speed
! 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
% Tester knob indication: Voltage (&)
Is the voltage OK?
YES Go to Step 3.
• Open or short circuit in the G/B wire.
NO • If the wire is OK, replace the IAP sensor with a
new one.
(+ R/Bl – - Ground)
(+ R/Bl – - B/Br)
(+ G/B – - B/Br)
FI SYSTEM DIAGNOSIS
1
2
12-32
V
V