14" Tp Sensor Circuit Malfunction - Suzuki RM-z450 Owner's Service Manual

12-27 FI SYSTEM DIAGNOSIS

"14" TP SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
Output voltage is not within the following range.
Difference between actual throttle opening and
opening calculated by ECM is larger than specified
value.
0.5 V Sensor voltage < 4.8 V
TP sensor
When using the multi-circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle pointed tester probe to prevent the terminal damage or terminal bend.
INSPECTION
Step 1
1) Stop the engine.
2) Check the TP sensor coupler for loose or poor contacts.
If OK, then measure the TP sensor input voltage.
3) Disconnect the TP sensor coupler.
4) Connect a 12 volts battery using the battery lead wire to ser-
vice coupler. ("12-22)
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.
• TP sensor maladjusted.
• TP sensor circuit open or short.
• TP sensor malfunction.
• ECM malfunction.
Bl R/Bl
Y Y
B/Br
B
CAUTION
(+ R/Bl – - Ground)
(+ R/Bl – - B/Br)
POSSIBLE CAUSE
ECM
VCC
TP
E2
1
1
V