What are the good-board voltage readings for the U6 IC pins?

Pin 1 = 0.1 V, Pin 2 = 6.36 V, Pin 3 = -3.5 V (3.5 V between pins 1 and 3), 8.56 V between pins 4 and 5, Pin 9 = 5 V, Pin 10 = 4.8 V, Pin 11 = 4.8 V, Pin 12 = 5 V, Pin 13 = 0 V, Pin 14 = GND, Pin 15 = 0 V, Pin 16 = 5 V. Also noted: U5 pin 1 = 7 V.

What are the pin functions of the U6 chip in this schematic?

Pin 1 C1+, Pin 2 V+, Pin 3 C1-, Pin 4 C2+, Pin 5 C2-, Pin 6 V-, Pin 7 T2OUT, Pin 8 R2IN, Pin 9 R2OUT, Pin 10 T2IN, Pin 11 T1IN, Pin 12 R1OUT, Pin 13 R1IN, Pin 14 T1OUT, Pin 15 GND, Pin 16 Vdd.

What capacitors are connected to U6?

Capacitors C26, C27, C28, and C29 are shown, with 0.1 (µF) values marked on C26, C29, and near C28.

What does U6 connect to on this board?

The transmit/receive lines from U6 route to a 9-pin connector labeled P1, identified as 'CONNECTOR D' (a D-sub connector) with pins 1-9 shown.

Were these measurements taken from a working or faulty board?

The document states 'GOOD WORKING BOARD NO ISSUES,' so the voltages are reference values from a known-good board.

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Ford Probe ECU Board U6 MAX232-Type IC Pin Voltages - Good Board Reference

Megasquirt MAX232 schematic annotated with good-board pin voltages on DB9 connector

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Megasquirt MAX232 serial-interface schematic annotated with known-good board pin voltages for the DB9 connector pins 1-16.

AI caption November 2011 · Photo 243 of 676

This document is an annotated electronic schematic showing a 16-pin serial line driver/receiver IC labeled U6 (with pin functions C1+, V+, C1-, C2+, C2-, V-, T2OUT, R2IN, R2OUT, T2IN, T1IN, R1OUT, R1IN, T1OUT, GND, Vdd — the classic MAX232-style pinout) connected through 0.1 µF capacitors (C26, C27, C28, C29) to a 9-pin D-sub connector labeled P1. The uploader has overlaid measured voltage readings from a known-good circuit board: Pin 1 = 0.1 V, Pin 2 = 6.36 V, Pin 3 = -3.5 V, 3.5 V between pins 1 and 3, 8.56 V between pins 4 and 5, and U5 pin 1 = 7 V. The right-side annotations list Pin 9 = 5 V, Pin 10 = 4.8 V, Pin 11 = 4.8 V, Pin 12 = 5 V, Pin 13 = 0 V, Pin 14 = GND, Pin 15 = 0 V, Pin 16 = 5 V. A large caption states 'GOOD WORKING BOARD NO ISSUES,' indicating these are reference voltages for diagnosing a faulty board (likely an ECU/cluster serial interface, per the album context). A partially legible note references signal jumpers JS0, JS1, JS2, JS3, JS10 between CPU and connector.

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Frequently asked questions

What are the good-board voltage readings for the U6 IC pins?: Pin 1 = 0.1 V, Pin 2 = 6.36 V, Pin 3 = -3.5 V (3.5 V between pins 1 and 3), 8.56 V between pins 4 and 5, Pin 9 = 5 V, Pin 10 = 4.8 V, Pin 11 = 4.8 V, Pin 12 = 5 V, Pin 13 = 0 V, Pin 14 = GND, Pin 15 = 0 V, Pin 16 = 5 V. Also noted: U5 pin 1 = 7 V.
What are the pin functions of the U6 chip in this schematic?: Pin 1 C1+, Pin 2 V+, Pin 3 C1-, Pin 4 C2+, Pin 5 C2-, Pin 6 V-, Pin 7 T2OUT, Pin 8 R2IN, Pin 9 R2OUT, Pin 10 T2IN, Pin 11 T1IN, Pin 12 R1OUT, Pin 13 R1IN, Pin 14 T1OUT, Pin 15 GND, Pin 16 Vdd.
What capacitors are connected to U6?: Capacitors C26, C27, C28, and C29 are shown, with 0.1 (µF) values marked on C26, C29, and near C28.
What does U6 connect to on this board?: The transmit/receive lines from U6 route to a 9-pin connector labeled P1, identified as 'CONNECTOR D' (a D-sub connector) with pins 1-9 shown.
Were these measurements taken from a working or faulty board?: The document states 'GOOD WORKING BOARD NO ISSUES,' so the voltages are reference values from a known-good board.