FI SYSTEM DIAGNOSIS 4-59 7) Disconnect the ECM coupler. 1 8) Check the continuity between Red wire A and terminal A. ! 9) If OK, then check the continuity between G/Y wire C and ter- minal P. 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 1 (4-56) and go to Step 2. NO Red or G/Y wire open, or G/Y wire shorted to ground 10)After repairing the trouble, clear the DTC using SDS tool. (4-27) Step 2 2 1) Connect the AP sensor coupler and ECM coupler. V 2) Insert the needle pointed probes to the lead wire coupler. E Turn the ignition switch ON. 3) Measure the AP sensor output voltage at the wire side cou- pler (between G/Y and B/Br wires). PL AP sensor output voltage: Approx. 2.6 V at 760 mmHg (100 kPa) M (+ G/Y – - B/Br) 09900-25008: Multi-circuit tester set A 09900-25009: Needle pointed probe set S Tester knob indication: Voltage () YES Go to Step 3. • Check the air passage for clogging. NO • Open or short circuit in the G/Y wire • Replace the AP sensor with a new one. 4) After repairing the trouble, clear the DTC using SDS tool. (4-27)