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Check reference values between ECM terminals and ground under the following conditions: ECM TERMINAL NO. ITEM CONDITION DATA (AVERAGE DC VOLTAGE) 6 Injector 2 • Engine is running • Warm-up condition • Idle • Accelerate suddenly Voltage: 11 - 14 V 7 Injector 3 27 Injector 1 47 Injector 4 ECM TERMINAL NO. ITEM CONDITION DATA (AVERAGE DC VOLTAGE) 17 Sensor (GND) • Engine is running • Warm-up condition: • Idle: 795 RPM • IAT: 36°C • IAT signal: 1.88 V 0 V 33 Regulated sensor supply 1 Approximately 5 V 37 Air flow sensor Approximately 322 kg/h Approximately 1.39 V On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION DTC SET CONDITION POSSIBLE CAUSE P0171 Fuel trim system too lean Engine is running The amount of • Intake air leaks • Air flow sensor • Fuel injector • Exhaust gas leaks • Incorrect fuel • lack of fuel • Incorrect PCV • Upstream O 2 sensor • 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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