4-60 FI SYSTEM DIAGNOSIS Step 3 3 1) Remove the AP sensor. 2) Connect the vacuum pump gauge to the vacuum port of the AP sensor. Arrange 3 new 1.5 V batteries in series 1 (check that total voltage is 4.5 – 5.0 V) and connect - terminal to the ground V terminal 2 and + terminal to the VCC terminal 3. 3) Check the voltage between Vout 4 and ground. Also, check if voltage reduces when vacuum is applied up to 400 mmHg by using vacuum pump gauge. (Below) 09917-47011: Vacuum pump gauge 09900-25008: Multi-circuit tester set Tester knob indication: Voltage () Is the voltage OK? 3 • Red, G/Y or B/Br wire open or shorted to ECM coupler (Harness side) ground, or poor A, P or S connection. (Black) (Gray) • If wire and connection are OK, intermittent trou- YES ble or faulty ECM. • Recheck each terminal and wire harness for open circuit and poor connection. E • Replace the ECM with a known good one, and L inspect it again. If check result is not satisfactory, replace AP sen- NO P sor with a new one. M 4) After repairing the trouble, clear the DTC using SDS tool. (4-27) A Output voltage (VCC voltage 4.5 – 5.0 V, ambient temp. 20 – S 30 °C, 68 – 86 °F) ALTITUDE ATMOSPHERIC OUTPUT (Reference) PRESSURE VOLTAGE (ft) (m) (mmHg) kPa (V) 0 0 760 100 3.1 – 3.6 2 000 610 707 94 2 001 611 707 94 2.8 – 3.4 5 000 1 524 634 85 5 001 1 524 634 85 2.6 – 3.1 8 000 2 438 567 76 8 001 2 439 567 76 2.4 – 2.9 10 000 3 048 526 70