4-70 FI SYSTEM DIAGNOSIS
Step 2
1) Turn the ignition switch to OFF.
2) Remove the air cleaner box and lift up the throttle body.
(
5-13)
3) Disconnect the STP sensor coupler.
4) Install the test harness to the STP sensor.
5) Check the continuity between each terminal and ground.
STP sensor continuity:
∞
Ω
(Infinity)
(Terminal – Ground)
09900-25008: Multi-circuit tester set
09900-28630: TPS test wire harness
6) If OK, then measure the STP sensor resistance at the wire
terminals (between terminal
B
and terminal
C
).
7) Close and open the secondary throttle valve by finger, and
measure the valve closing and opening resistance.
STP sensor resistance
Secondary throttle valve is closed: Approx. 0.5 k
Ω
Secondary throttle valve is opened: Approx. 3.9 k
Ω
Tester knob indication: Resistance (
Ω
)
2
ECM
STP
Y/W
R
B/Br
2
2
2