OBD not communicating with ECU?

BOFFVW9N

MEMBER
2003 VOLKSWAGEN POLO
1.2L
3 CYL
2WD
AUTOMATIC
300,000 MILES

Hi, I have used several obd2 adapters and none of them can communicate with ECU. Can anyone help please?

Thursday, October 19th, 2023 AT 9:44 AM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi,

The only information I have on the Polo is with a 1.6L engine and my manual has little to no information. Is that what you have? Also, when you connect to the data link connector, is there power present and does the scan tool turn on?

Let me know that first. If possible, check pin 16 in the data link connector (DLC). It should have battery voltage.

Let me know.

Joe

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Thursday, October 19th, 2023 AT 8:15 PM

BOFFVW9N

MEMBER
2 POSTS

Hi and thanks for the reply. It 1.2 manual transmission and yes there is 12v on data link and the obd2 scanner power on but still no communication.

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Friday, October 20th, 2023 AT 5:12 AM

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Check the wiring at the ECM to make sure nothing is loose or damaged. Also, make sure the connectors aren't corroded.

You may have a faulty ECM.

Let me know what you find,

Joe

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Friday, October 20th, 2023 AT 2:29 PM