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Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA (DC VOLTAGE) 19 Air flow sensor • Engine is running • Warm-up condition • Idle 0 - 1 V • Engine is running: 3,000 6 - 9 V 74 Air flow sensor • Engine is running • Warm-up condition • Idle 2.2 - 3.2 V • Engine is running: 2,500 On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE 12 Air flow sensor Engine speed is above 500 RPM Sensor output frequency is below 3 HZ for 4 seconds. • Air flow sensor • Harness or • ECM DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on and record and erase DTC. • Start engine and keep the engine speed above 500 RPM and select view DTC and data stream. • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 03 Electronic Engine Controls for more information. NOTE : NOTE : Diagnostic Procedure 1. CHECK GROUND CONNECTION • Turn ignition switch off. • Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con- trols). • Inspect the ground connection E-208 (See Vehicle Wiring Harness Layout - Engine Room Harness (With Mit- subishi 2.4L Engine) in Section 16 Wiring). Is the ground connections OK? Yes >> Go to the next step. No >> Repair or replace ground connection. DIAGNOSIS & TESTING 03
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