4-56 FI SYSTEM DIAGNOSIS
“29” (P1654-H/L) STP SENSOR CIRCUIT MALFUNCTION
INSPECTION
NOTE:
After repairing the trouble, clear the DTC using SDS tool.
(
4-24)
Step 1 (When indicating 29:)
1) Turn the ignition switch OFF.
2) Lift up the fuel tank by removing the fuel tank mounting bolt.
(
5-3)
3) Check the STP sensor coupler for loose or poor contacts.
If OK, then measure the STP sensor input voltage.
DETECTED CONDITION
POSSIBLE CAUSE
29
Signal voltage is not within the following
range.
Difference between actual throttle open-
ing and opening calculated by ECM is
larger than specified value.
0.35 V
Sensor voltage < 4.9 V
• STP sensor maladjusted
• STP sensor circuit open or short
• STP sensor malfunction
• ECM malfunction
P1654
H
Sensor voltage is higher than specified
value.
• STP sensor circuit shorted to VCC or ground cir-
cuit open
• STP sensor circuit open or shorted to ground or
VCC circuit open
L
Sensor voltage is lower than specified
value.
ECM
Bl
Y
R
Bl/Y
B/Br
B
VCC
STPS
E2
STP sensor
When using the multi circuit tester, do not strongly touch the terminal of the ECM coupler with
a needle-point probe to prevent the terminal damage or terminal bend.
1
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