Suzuki LT-A450X, Manual

Page: 255 / 528

FI SYSTEM DIAGNOSIS 5-39
Step 2
1) Connect the TP sensor coupler and ECM coupler.
2) Insert the needle pointed probes to the lead wire coupler.
3) Turn the ignition switch to ON.
4) Measure the TP sensor output voltage at the coupler
(between
+
Yellow wire
B
and
-
B/O wire
C
) by pushing
the throttle lever.
& TP sensor output voltage (
+
Yellow –
-
B/O)
Throttle valve is closed : 0.93 – 1.31 V
Throttle valve is opened: 3.64 – 4.82 V
% 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
3 Tester knob indication: Voltage ( 4 )
#
Is the voltage OK?
5) After repairing the trouble, clear the DTC using SDS tool.
(
$
5-23)
When us ing the m ulti-circuit te ster, do no t s trongly
touch the terminal of the ECM coupler with a needle
pointed tester probe t o pr event t he terminal damage
or terminal bend.
YES
• Red, Yellow or B/O wire open or shorted to
ground, or poor
6
,
C
or
J
connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
If check result is not satisfactory, replace TP sen-
sor (throttle body assembly) with a new one.
2
V
ECM coupler (wiring harness side)