dtc no communications

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
2001 Jetta tdi automatic. I was driving on the interstate and the Jetta went into limp mode. 3rd gear only, no tach reading,oil pressure light, ABS light,Brake light on and chimes .
Tried to clear codes with VCDS lite but no help, would not clear

Checked fuses. Cleaned grounds under battery/plenum and fwd of ECU.No help. Removed connectors from TCU,ECU and ABS module,no corrosion all looks good.


ABS controller: 01312-powertrain data bus / 37-00 faulty

instrument controller :01314 engine control module 49-00 no communications
:01315 transmission control module 49-00 no communications

Engine controller:18057 Power train Data Bus-Missing message from ABS controller P1649 35-10 intermittent

:18034 Power train data bus missing message from TCU P1626 35-10 intermittent

Transmission controller: 00777 Accelerator Position Sensor (G79) 27-00 implausible signal
00545 Engine to Trans Electrical Connection 31-00 Open or Short to ground

I need help:(
 

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
Could this be a bad instrument cluster causing this ? I need to check power and ground on the harness but I don't have a diagram
 

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
i noticed the gear indicator is blank when the key is turned on or engine is running. VCDS does show the trans going into each selected gear position. When the key is turned to the on position,all lights appear to illuminate as they should EXCEPT the glow plug light.When the engine starts the ABS light stays on, approx. 8 seconds later the oil pressure light begins to flash along with 3 beeps. 10 to 15 seconds later the brake light illuminates and the 3 beeps again . Anyone?
 

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
her is an autoscan from vcds lite
VAG-COM Version: Release 409.1-S


Chassis Type: 1J - VW G/J/B Mk4
Scan: 01,02,03,08,16,15,17,19,22,35,46,56

-------------------------------------------------------------------------------
Address 01: Engine
Controller: 038 906 012 BD
Component: 1,9l R4 EDC G000AG 2507
Coding: 00001
Shop #: WSC 00066
5 Faults Found:
18057 - Powertrain Data Bus: Missing Message from ABS Controller
P1649 - 35-10 - - - Intermittent
18044 - Shareware Version. To Decode all DTCs
P1636 - 35-10 - Please Register/Activate - Intermittent
18058 - Shareware Version. To Decode all DTCs
P1650 - 35-10 - Please Register/Activate - Intermittent
18034 - Powertrain Data Bus: Missing Message from TCU
P1626 - 35-10 - - - Intermittent
17664 - Shareware Version. To Decode all DTCs
P1256 - 35-00 - Please Register/Activate
Readiness: N/A

-------------------------------------------------------------------------------
Address 02: Auto Trans
Controller: 01M 927 733 KA
Component: AG4 Getriebe 01M 4761
Coding: 00000
Shop #: WSC 00000
6 Faults Found:
00777 - Accelerator Position Sensor (G79)
27-00 - Implausible Signal
00660 - Shareware Version. To Decode all DTCs
27-00 - Please Register/Activate
00529 - Shareware Version. To Decode all DTCs
35-00 - Please Register/Activate
00545 - Engine-Transmission Electrical Connection
31-00 - Open or Short to Ground
01314 - Shareware Version. To Decode all DTCs
49-00 - Please Register/Activate
01312 - Shareware Version. To Decode all DTCs
49-00 - Please Register/Activate

-------------------------------------------------------------------------------
Address 03: ABS Brakes
Controller: 1J0 907 379 P
Component: ABS 20 IE CAN 0001
Coding: 03504
Shop #: WSC 00066
1 Fault Found:
01312 - Powertrain Data Bus
37-00 - Faulty
 

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
Update on diagnosis progress:confused:. Checking for power and grounds and continuity.
I found .09 volts on the shift solenoid voltage supply connector with the key on. There was 11.72 volts on the EPC voltage supply connector. I'm thinking bad TCM . Anyone else? I didn't start the engine and check.
It will manually shift thru all gears except 4th. Do the solenoids get the manual input signal from the TCM thru each grounding of the selected solenoid? Any 01M guru's ?
Thanks, Kirk
 

jetech1

Member
Joined
Nov 12, 2009
Location
Tampa,fl
TDI
'98 Jetta tdi '01 jetta tdi
resolved ?

Well here is an update, I registered VCDS-lite and did the scans again. No big help there BUT I ran the tests for each module and the ABS, brake and flashing oil light went out!!! I am happy the Jetta is working again , but I am wondering what actually caused the issue ! I suspect the ABS module but I am not sure. I guess I will just have to drive the car and see if the issue happens again
 
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