OBD1 connector

1994 TOYOTA PICKUP

240,000 MILES • 3.0L • 6 CYL • 4WD • MANUAL

MCOURSEN

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Can you replace the OBD1 connector? I recently purchased this truck and it came with the check engine light on. I went to read the codes on the truck and noticed the OBD1 connector was looking rough. I tried to read them anyways and received the "could not make connection to ECU" response. I have google'd around to see if I could find the part but I am having no luck.

Apr 16, 2019 at 9:50 AM

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JACOBANDNICKOLAS

AUTOMOTIVE REPAIR CONTRIBUTOR
110,190 POSTS

Welcome to 2CarPros.

The vehicle should have an OBD port under the hood. See pic 1. Is that what you are referring to? As far as retrieving codes, it just requires a jumper wire. Also, here are the directions for testing. Pictures 2 and 3 correlate with the directions.

Let me know if this is what you are doing. Also, what is in bad condition?

Retrieving Data Trouble Codes In Normal Mode
picture 2

Retrieving Data Trouble Codes In Test Mode
picture 3

DESCRIPTION
The Data Link Connector is used to trigger the self diagnostic capabilities of the Engine Control Module (ECM).

OPERATION
By connecting the Data Link Connector terminals with a jumper wire as shown, the ECM will begin to indicate any stored Data Trouble Codes for either normal or test modes.

Let me know if this helps or if you have other questions. Also, here is a link you may find helpful. Not only does it show how to retrieve OBD 1 codes, but provides a list of codes to help determine problems.

https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995

Take care,
Joe

Images (Click to enlarge)

Apr 16, 2019 at 10:32 AM