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I recently purchased a 2002 Golf GLS from a guy in Phoenix. Before he sold it to me, he was having troubles with the check engine light coming on, along with a flashing glow plug light. He took it to the mechanic, who gave him a "VCDS VAG/VAS Emulator" print out showing the following information:
16612 - Throttle Pedal Position Sensor (G79): Signal too High
P0228 - 25-10 - - - Intermittent
The owner then agreed to having the mechanic replace and reprogram the ECU, as well as the Throttle Actuator (reciept shows PN "6Q1 721 503H"). This supposedly fixed the problem, and the CEL and GP lights went off, and I purchased the car. After driving 1000 miles down the road, the same problem shows up again: CEL is solid, GP light is flashing, and an OBDII reader gives code P0228. The car still idles, and drives just fine, and I routinely get 47+mpg. I'd just like to figure out what is causing this problem and what I can do to fix it. When switching the key to the on position, the GP light goes out almost immediately. I'm going on a road trip to North-Eastern Washington state in a few days, and am worried that my lack of glow plugs may be an issue with the sub-freezing temperatures I'll be living in for a few days.
What I've tried:
- I reset the code. It comes back within 100 miles.
- I took the 6-pin wiring harness out from the throttle position sensor and tested the voltages as described in the lower right hand corder of the attached page from the manual. The readings are supposed to be "4.5 volts minimum." The readings were as follows:
Terminal 1 and ground: 6.2v
Terminal 1 and 5: nothing (well, 15mv to be exact)
Terminal 2 and ground: 6v
Terminal 2 and 3: 4.9v
I also tested Terminal 5 and ground and got 6 volts.
- I did a continuity test between pin 1 on the TPS harness and pin 63 of the ECU harness, which tested fine.
- I did another continuity test between pin 5 on the TPS harness and pin 70 of the ECU Harness, which also tested fine.
Any thoughts? Like I said, the reciepts show the ECU and Throttle Actuator being replaced less than 2000 miles before this started happening again. What else can I check or do to solve this problem? Any advice or information would be greatly appreciated. Thanks in advance!
16612 - Throttle Pedal Position Sensor (G79): Signal too High
P0228 - 25-10 - - - Intermittent
The owner then agreed to having the mechanic replace and reprogram the ECU, as well as the Throttle Actuator (reciept shows PN "6Q1 721 503H"). This supposedly fixed the problem, and the CEL and GP lights went off, and I purchased the car. After driving 1000 miles down the road, the same problem shows up again: CEL is solid, GP light is flashing, and an OBDII reader gives code P0228. The car still idles, and drives just fine, and I routinely get 47+mpg. I'd just like to figure out what is causing this problem and what I can do to fix it. When switching the key to the on position, the GP light goes out almost immediately. I'm going on a road trip to North-Eastern Washington state in a few days, and am worried that my lack of glow plugs may be an issue with the sub-freezing temperatures I'll be living in for a few days.
What I've tried:
- I reset the code. It comes back within 100 miles.
- I took the 6-pin wiring harness out from the throttle position sensor and tested the voltages as described in the lower right hand corder of the attached page from the manual. The readings are supposed to be "4.5 volts minimum." The readings were as follows:
Terminal 1 and ground: 6.2v
Terminal 1 and 5: nothing (well, 15mv to be exact)
Terminal 2 and ground: 6v
Terminal 2 and 3: 4.9v
I also tested Terminal 5 and ground and got 6 volts.
- I did a continuity test between pin 1 on the TPS harness and pin 63 of the ECU harness, which tested fine.
- I did another continuity test between pin 5 on the TPS harness and pin 70 of the ECU Harness, which also tested fine.
Any thoughts? Like I said, the reciepts show the ECU and Throttle Actuator being replaced less than 2000 miles before this started happening again. What else can I check or do to solve this problem? Any advice or information would be greatly appreciated. Thanks in advance!