FI SYSTEM DIAGNOSIS 4-41 Step 3 3 1) Turn the ignition switch OFF. 2) Remove the IAP sensor. 3) Connect the vacuum pump gauge to the vacuum port of the IAP sensor. Arrange 3 new 1.5 V batteries in series 1 (check that total - v voltage is 4.5 – 5.0 V) and connect - terminal to the ground - terminal 2 and + terminal to the VCC terminal 3. 4) 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. (4-42) 09917-47011: Vacuum pump gauge 09900-25008: Multi-circuit tester set Tester knob indication: Voltage () Is the voltage OK? 3 • G/B, Red or B/Br wire open or shorted to ECM coupler (Harness side) ground, or poor 9, A or S connection (Black) (Gray) • If wire and connection are OK, intermittent trou- YES ble or faulty ECM. E • Recheck each terminal and wire harness for L open circuit and poor connection. • Replace the ECM with a known good one, and P inspect it again. If check result is not satisfactory, replace the IAP NO M sensor with a new one. A 5) After repairing the trouble, clear the DTC using SDS tool. (4-27) S