First let me say I am NOT a VW mech, but have found info on your code,
Engine Speed (RPM) Sensor G28, checking NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Speed (RPM) Sensor G28. " Special tools, testers and auxiliary items required Multimeter. " Wiring diagram. " Test requirements Fig. 76: Identifying Main Fuse Panel Courtesy of VOLKSWAGEN UNITED STATES, INC. The Motronic Engine Control Module (ECM) J220 fuses OK. " Battery voltage at least 12.5 volts. " All electrical consumers such as, lights and rear window defroster, switched off. " Vehicles with automatic transmission, shift selector lever into position "P" or "N". " A/C switched off. " Ground (GND) connections between engine/transmission/chassis OK. " Ignition switched off. " Test procedure Perform a preliminary check to verify the customers complaint. Refer to Ã Generic Scan Tool (GST) Manual Contents " Start diagnosis Function The Engine Speed (RPM) Sensor G28 detects RPM and reference marks. Without an engine speed signal, the engine will not start. If the engine speed signal fails while the engine is running, the engine will stop immediately. Function test Connect the scan tool. " Switch the ignition on. " Using the scan tool, check the engine speed: " End diagnosis and switch ignition off. " If the specified value was not obtained: Checking internal resistance Fig. 77: Identifying Engine Speed Sensor G28 Electrical Harness Connector Courtesy of VOLKSWAGEN UNITED STATES, INC. Disconnect the Engine Speed (RPM) Sensor G28 electrical harness connector - arrow -. " Fig. 78: Checking Engine Speed Sensor G28 Terminals 2 To 3 For Resistance Courtesy of VOLKSWAGEN UNITED STATES, INC. Using a multimeter, check the Engine Speed (RPM) Sensor G28 terminals - 2 to 3 - for resistance. " Specified value: 480 to 1000 Ã © (at approx. 20 C) Check Engine Speed (RPM) Sensor G28 terminals 1 to 2 and 1 to 3 for short circuits. " Specified value: Ã (infinity) If any of the specified values are not obtained: Replace the Engine Speed (RPM) Sensor G28. Refer to 13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK " If the specified values are obtained: Checking wiring If the manufacturers test box is being used, perform the following step. Install the Adapter Cable (121-pin) VAG1598/31. Refer to 24 - MULTIPORT FUEL INJECTION (MFI). " If the manufacturers test box is not being used, perform the following step. Remove the Motronic Engine Control Module (ECM) J220. Refer to Ã Motronic Engine Control Module (ECM) J220, Replacing. " Fig. 79: Identifying 3-Pin Harness Connector Terminals Courtesy of VOLKSWAGEN UNITED STATES, INC. Using a Multimeter, check the Engine Speed (RPM) Sensor G28 electrical harness connector T3 terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector T121 terminals for an open circuit. " Specified value: 1.5 Ã © Max. If the specification was not obtained: Check the wiring for a short circuit to each other, Battery (+), or Ground (GND). " Check the electrical harness connector for damage, corrosion, loose or broken terminals. " If necessary, Repair the faulty wiring connection. " If no malfunction is detected in the wiring: Remove the Engine Speed (RPM) Sensor G28 and check the sensor wheel for proper seating, damage and run-out. Refer to 13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK. Replace if damaged. " If the sensor wheel is OK: Erase the DTC memory. Refer to Ã Diagnostic Mode 04: Reset/delete diagnostic data. " Perform a road test to verify Repair. " If the DTC does not return: Repair complete, Generate readiness code. Refer to Ã Readiness Code. End diagnosis. " If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK: Replace the Motronic Engine Control Module (ECM) J220. Refer to Ã Motronic Engine Control Module (ECM) J220, Replacing. " Assembly is performed in the reverse of the removal. " Final procedures After the Repair work, the following work steps must be performed in the following sequence: Check the DTC memory. 1. If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete diagnostic data. 2. If the DTC memory was erased, generate readiness code. Refer to Readiness Code. 3. End of diagnosis.
Saturday, May 30th, 2009 AT 8:02 AM