FI SYSTEM DIAGNOSIS 5-65
Step 3
1) Turn the ignition switch OFF.
2) Disconnect the STP sensor coupler and install the test har-
ness.
3) Disconnect the STVA lead wire coupler.
4) Turn the ignition switch ON.
5) Measure the STP sensor output voltage at the terminals
(between
+ terminal
A Y/W wire and
- terminal
C B/Br
wire) by turning the secondary throttle valve (close and open)
with a finger.
$ STP sensor output voltage
Secondary throttle valve is closed: Approx. 0.6 V
Secondary throttle valve is opened: Approx. 4.2 V
! 09900-25008: Multi-circuit tester set
09900-28630: TPS test wire harness
& Tester knob indication: Voltage (')
Is the voltage OK?
After repairing the trouble, clear the DTC using SDS tool.
(#5-26)
3
V
3
3
YES
• Red, Y/W or B/Br wire open or shorted to
ground, or poor
A,
J or
S 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 STP
sensor with a new one.
ECM coupler (Harness side)
3
(Black) (Gray)
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