FI SYSTEM DIAGNOSIS 4-63 Step 1 (When indicating P1651-L:) 1 1) Turn the ignition switch OFF. 2) Lift and support the fuel tank. (5-3) 3) Check the TO sensor coupler for loose or poor contacts. If OK, then check the TO sensor lead wire continuity. 4) Disconnect the TO sensor coupler. 1 5) Check the continuity between Black wire B and ground. ! 6) Also, check the continuity between Black wire B and B/Br wire C. If the sound is not heard from the tester, the circuit condition is OK. 7) Disconnect the ECM coupler. 1 E 8) Check the continuity between Red wire A and terminal A. L 9) Also, then check the continuity between Black wire B and terminal L. P TOS lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set M 09900-25009: Needle pointed probe set A (Black) (Gray) Tester knob indication: Continuity test () ECM coupler (Harness side) S Is the continuity OK? YES Go to Step 2. NO Red or Black wire open, or Black wire shorted to ground. 10)After repairing the trouble, clear the DTC using SDS tool. (4-27)