4-56 FI SYSTEM DIAGNOSIS
4) Disconnect the AP sensor coupler.
5) Turn the ignition switch to ON.
6) Measure the voltage at the R wire and ground.
7) If OK, then measure the voltage at the Red wire A and B/Br
wire B.
AP sensor input voltage: 4.5 – 5.5 V
(+ R – - Ground)
(+ R – - B/Br)
09900-25008: Multi-circuit tester set
Tester knob indication: Voltage ()
Is the voltage OK?
Step 1 (When indicating P1450-H:)
1) Turn the ignition switch to OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the AP sensor coupler for loose or poor contacts.
If OK, then check the AP sensor lead wire continuity.
4) Disconnect the AP sensor coupler.
5) Check the continuity between R wire A and G/Y wire C. If
the sound is not heard from the tester, the circuit condition is
OK.
YES Go to Step 2.
NO
• Loose or poor contacts on the ECM coupler
(terminal A or S)
• Open or short circuit in the R wire or B/Br wire
V
1
1
1
]
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