Section 21 (Engine Controls - Pin Voltage Charts): Introduction

WARNING: This page is about a different car, the 1991 Volkswagen Jetta, 1991 Volkswagen Golf, and 1991 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Pin voltage charts are supplied to reduce diagnostic time. Checking pin voltages at ECU determines whether ECU is receiving and transmitting proper voltage signals. Charts may also help determine if ECU harness has an electrical short or open.

NOTE: Unless stated otherwise in testing procedures, perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance. Voltage readings may vary slightly due to battery condition or charging rate. Tests are done at ECU connector or using Terminal Test Box (VAG 1598).