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Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA 17 Sensor (GND) Ignition switch on Approximately 0 V 33 Regulated sensor supply 1 5 V 37 Air flow sensor • Engine is running • Warm-up condition ECT: • Idle: 795 RPM • IAT: 36°C • IAT signal: 1.88 V • Approximately 322 kg/h • Approximately 1.39 V • Engine is running • Warm-up condition ECT: • Idle: 910 RPM • IAT: 30°C • IAT signal: 2.17 V • Approximately 420 kg/h • 1.52 V On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE P0103 Mass or Volume Air Flow (MAF) circuit high input Ignition switch on or engine is running ECM detected that • MAF 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. • With the scan tool, record and erase stored DTCs in the ECM. • Start engine and warm it to normal operating temperature, then 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 : DIAGNOSIS & TESTING 03
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