general information - Martin Nez

4-56 FI SYSTEM DIAGNOSIS4) 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/Brwire 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?YES Go to Step 2.• Loose or poor contacts on the ECM couplerNO (terminal A or S)• Open or short circuit in the R wire or B/Br wire1VStep 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.14) Disconnect the AP sensor coupler.5) Check the continuity between R wire A and G/Y wire C. Ifthe sound is not heard from the tester, the circuit condition isOK.1]