4-66 FI SYSTEM DIAGNOSIS Step 2 2 1) Turn the ignition switch OFF. 2) Disconnect the STVA lead wire coupler. 3) Check the continuity between each terminal and ground. STVA continuity: ∞ Ω (Infinity) (Terminal – Ground) 4) If OK, then measure the STVA resistance (between Black 2 wire A and Pink wire B) and (between Green wire C and W/BI wire D). STVA resistance: Approx. 6.5 Ω (Black A – Pink B) (Green C – W/BI D) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance (Ω) Is the resistance OK? 2 E • W/B, P/W, Green and B/Lg wire open or shorted ECM coupler (Harness side) (Black) (Gray) to ground, or poor 1, 2, H and I connection L • If wire and connection are OK, intermittent trou- P YES ble or faulty ECM. • Recheck each terminal and wire harness for M open circuit and poor connection. A • Replace the ECM with a known good one, and inspect it again. S NO • Loose or poor contacts on the ECM coupler. • Replace the STVA with a new one. 5) After repairing the trouble, clear the DTC using SDS tool. (4-27)