4-58 FI SYSTEM DIAGNOSIS 6) Disconnect the ECM coupler. 1 7) Check the continuity between G/Y wire C and terminal P. ! 8) If OK, then check the continuity between B/Br wire B and ter- minal S. APS lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set 09900-25009: Needle pointed probe set Tester knob indication: Continuity test () (Black) (Gray) ECM coupler (Harness side) Is the continuity OK? YES Go to Step 2. NO G/Y wire shorted to VCC, or B/Br wire open 9) After repairing the trouble, clear the DTC using SDS tool. (4-27) Step 1 (When indicating P1450-L:) 1 1) Turn the ignition switch OFF. 2) Remove the front seat. (8-7) 3) Check the AP sensor coupler for loose or poor contacts. If OK, then check the AP sensor lead wire continuity. E PL 4) Disconnect the AP sensor coupler. M 1 5) Check the continuity between G/Y wire C and ground. A V 6) Also, check the continuity between G/Y wire C and B/Br wire B. If the sound is not heard from the tester, the circuit condi- S tion is OK.