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Courtesy of VOLKSWAGEN UNITED STATES, INC. DTC P0321/16705: ENGINE SPEED SENSOR (RPM - G28) - IMPLAUSIBLE SIGNAL Test Requirement Ensure all fuses are okay, battery voltage is at least 11.5 volts and fuel pump relay is okay. Ensure all electrical Test Procedure 1. Disconnect grey 3-pin harness connector from Engine Speed Sensor (G28). See Fig. 30 . Using DVOM measure resistance between terminals No. 2 and 3 of Engine Speed sensor. See Fig. 31 . Resistance 2. Disconnect ECM harness connector, leave ECM disconnected from test box. Connect Test Box (VAG 1598/31) to ECM harness connector. See CONNECTING VAG TEST BOX . Using DVOM, check z Engine Speed sensor 3-pin harness connector terminal No. 1 and test box socket No. 108. z Engine Speed sensor 3-pin harness connector terminal No. 2 and test box socket No. 90. z Engine Speed sensor 3-pin harness connector terminal No. 3 and test box socket No. 82. Resistance should be a maximum of 1.5 ohms for each reading. Check wiring in Engine Speed sensor 3- 3. NOTE: If a test ends with ECM replacement, before replacing ECM be certain that, all NOTE: Engine Speed (RPM) Sensor (G28) is a speed and reference sensor. If Engine NOTE: There is a gap in sensor wheel. This gap is the reference mark.
2003 Volkswagen New Beetle GLS 2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)
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