1993 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS w/ 4L60-E)

1993 PCM RED Connector

PCM Pin Out Chart 1993 4.3L, 5.0L, 5.7L With Automatic Transmission 4L60-E

The 1993 throttle body fuel injection (TBI) system's computer has 2 connectors. One is red and the other is a blue one. Each connector has 2 rows of 16 slots for a total of 32 slots.

One row of the RED PCM's connector is prefixed with the letter A and its 16 terminals are labeled A-1 thru' A-16. The other row is prefixed with the letter B and its 16 terminals are labeled B-1 thru' B-16 (see the illustration above).

IMPORTANT: This pin out chart applies only to the 1993 4.3L V-6, 5.0L V-8, and 5.7L V-8 pickups with an automatic transmission (4L60-E only).

For other PCM pin-out charts, take a look at the following:

RED PCM 32 Pin Connector
Pin Wire Color Description
 A-1 BLK/WHT PCM Ground
 A-2 TAN/WHT PCM Ground
 A-3 LT BLU/WHT Idle Air Control (IAC) Valve 'A' High
 A-4 PPL/WHT Ignition Control Module REF High
 A-5 BLK/RED Ignition Control Module REF Low
 A-6 LT BLU/BLK Idle Air Control (IAC) Valve 'A' Low
 A-7 LT GRN/BLK Idle Air Control (IAC) Valve 'B' Low
 A-8 LT GRN/WHT Idle Air Control (IAC) Valve 'B' High
 A-9 DK GRN Fuel Injector 'B'
A-10 PPL Oxygen Sensor Signal
A-11 --- Empty
A-12 TAN Oxygen Sensor Ground
A-13 --- Empty
A-14 WHT/BLK DLC Diagnostic
A-15 DK BLU TP Signal
A-16 DK BLU Fuel Injector 'A'
 B-1 --- Empty
 B-2 TAN/BLK Ignition Control Module Bypass
 B-3 BLK Sensor Ground
 B-4 PPL Sensor Ground
 B-5 BLK/YEL Transmission Fluid Temp
 B-6 --- Empty
 B-7 --- Empty
 B-8 YEL ECT Sensor Signal
 B-9 --- Empty
B-10 WHT Cruise Control
B-11 --- Empty
B-12 GRY Fuel Pump Signal
B-13 LT GRN MAP Sensor Signal
B-14 --- Empty
B-15 DK BLU Knock Sensor
B-16 BRN EGR Pintle
PCM Pin Out Chart 1993 4.3L, 5.0L, 5.7L With Automatic Transmission 4L60-E

Safety Precautions

Here are some very important safety precautions when testing the wires coming out of the PCM connectors.

  1. If one or any of the wires on your GM vehicle DO NOT match the color stated in the pin out charts then you should not use the pin out charts in this article. Why? Because this is the clearest indication that these ARE NOT the connector pin out charts for your particular vehicle.
  2. Never probe the front of the connector.
    • You should use a wire piercing probe and probe the wire a few inches away from the connector.
    • You should use a Back Probe.
  3. You should never disconnect any of the PCM connectors without first disconnecting the battery negative (-) terminal.


I've made every effort to double and triple check the above info (and in the next couple of pages) and I've used the best sources to compile it but nothing in life is perfect. I don't have a staff of proof readers or editors, I'm just a little guy typing this stuff up in my spare time to help and give back to the Do-It-Yourself community. So without further ado, here's my disclaimer:

© copyright Abraham Torres-Arredondo: This information is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

If you do spot errors, please let me know. You can use the contact form at the end of the article.