16705/P0321/000801 - Engine Speed Sensor (G28): Implausible Signal
Possible Symptoms
Engine shuts off
Engine doesn't start
Speedometer inoperative
Glow Plug Indicator Lamp (K29) flashes
Possible Causes
Engine Speed Sensor (G28) loose
Engine Speed Sensor (G28) faulty
Possible Solutions
Check Engine Speed Sensor (G28)
Special Notes
The Engine Speed Sensor (G28) is also used as a reference sensor for the crankshaft position and correlates with the Camshaft Position Sensor Bank 1 (G40) and Camshaft Position Sensor Bank 2 (G163). When an engine will not start due to mechanical (spark/fuel/compression/timing) related issues it is not uncommon to set a false G28 fault codes due to extended cranking with a no-start condition.
When found in a VW Golf/Jetta (1J/9M) or Audi A3 (8L) with 1.9l TDI-PD (AXR), check TPI 2007067 which explains issues with electro magnetic interference. A modification to the wiring will fix this problem, extensive details can be found in the named TPI. Even though this TPI was originally released for VW Golf/Jetta (1J/9M), a customer of ours came across the same issue on an Audi A3 (8L).
When found in a 2004 VW Golf, Jetta, or New Beetle with 1.9l TDI-PD (BEW), check for TSB 2010461 (01-07-45 formerly 97-05-03) or 201463 (01-07-44 formerly 97-05-04) calling for a flash update to the ECU and a secondary ground installation.
General note for any engine type: Check the wiring to/from the sensor and engine control module to rule out harness and module damage due to engine oil or coolant from a failed sensor or tensioner. This is an example from a 2012 Tiguan with Coolant in the ECM which resulted in G28 DTCs in addition to intermittent stalling.
16706/P0322/000802 - Engine Speed Sensor (G28): No Signal
Possible Symptoms
Engine shuts off
Engine doesn't start
Tachometer / Rev Counter inoperative
Glow Plug Indicator Lamp (K29) flashes
Possible Causes
Engine Speed Sensor (G28) loose
Engine Speed Sensor (G28) faulty
Possible Solutions
Check Engine Speed Sensor (G28)
Special Notes
The Engine Speed Sensor (G28) is also used as a reference sensor for the crankshaft position.
Senast redigerat av it_mutt (6 september 2017)
De som säger att lycka inte kan köpas för pengar...har aldrig ägt en Audi
Shit! -What? Rollers. -No? Yep. -Shit!