4-82 FI SYSTEM DIAGNOSIS “C46” (P1657-H/L or P1658) EXCV ACTUATOR CIRCUIT MALFUNCTION DETECTED CONDITION POSSIBLE CAUSE C46 The operation signal does not reach the • EXCVA maladjusted EXCV actuator. • EXCVA circuit open or short EXCVA position sensor voltage low or • EXCVA motor malfunction high • EXCVA position sensor malfunction 0.1 V Sensor voltage < 4.9 V (without the above range) P1657 H Sensor voltage is higher than specified • EXCVA position sensor circuit shorted to VCC or value. ground circuit open L Sensor voltage is lower than specified • EXCVA position sensor circuit open or shorted to value. ground or VCC circuit open P1658 The operation signal does not reach the • EXCVA motor circuit open or short EXCVA motor. • EXCVA motor malfunction ECM does not receive communication signal from the STVA motor. ECM EXCVA E Gr B/R L MO P R/B MO B R P VCC Y Y MPS W B/Br E2 SAM INSPECTION 1 Step 1 (When indicating C46:) 1) Turn the ignition switch OFF. 2) Lift and support the fuel tank. (5-3) 3) Check the EXCVA lead wire coupler for loose or poor con- tacts. 4) Turn the ignition switch ON. 1 5) Check the operation of the EXCVA. (EXCVA operating order: Full close → Full open → 30% open) Is the operation OK? YES Go to Step 2. NO Go to Step 6.