What are the color of the PCM connectors?

C1 Blue. C2 Red . C3 Clear -or Grey- . C4 Black . Here are some very important safety precautions when testing the wires coming out of the PCM connectors. 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?

Where does the brown wire go on a PCM harness?

When you are removing wires from the harness, for instance pin 70 of blue connector, oil level switch. This brown wire will lead you to a connector that will have another wire on it. This other wire can be removed as well. In this instance, it will be a black wire, that will go to a ground splice.

Where does blue connector pin 41 go on Vortec PCM?

If removing trans, pay attention to BLUE connector pin 41. Some harnesses are different based on type of o2 sensors you have. Some this pin goes to trans only, some harnesses, there is a splice, and this pin goes to coolant temp sensor AND transmission.

Do you need to remove wires from PCM connectors?

BLOCKS HIGHLIGHTED LIKE THIS, ARE WIRES THAT ARE NEEDED, AND GO TO EXTERNAL CONNECTION FOR STAND ALONE BLOCKS HIGHLIGHTED LIKE THIS, ARE WIRES THAT CAN BE REMOVED FROM PCM CONNECTORS, NOT NEEDED. Note: Removing all of thesewill result in a non-emissions friendly harness.

What are the colors of a 32 pin PCM connector?

C1 (Blue) PCM 32 Pin Connector Pin Wire Color Description 1 — Empty 2 — Empty 3 Brown w/ White stripe 1X CMP Signal 4 Pink Ignition Feed

What are the pin out charts for PCM?

1998-99 PCM Connector Pin Out Charts (GM 4.3L, 5.0L, 5.7L). Each connector can be identified as: C1 Blue (32 Pin Connector). C2 Red (32 Pin Connector). C3 Clear -or Grey- (32 Pin Connector). C4 Black (24 Pin Connector). Contents of this tutorial: C1 Blue. C2 Red. C3 Clear -or Grey-. C4 Black.

What are the PCM connectors for GM 4.3L?

In this article, you’ll find the Pin Out descriptions of the 4 PCM Connectors for the 1998-1999 GM 4.3L, 5.0L or 5.7L Engines. NOTE: For other PCM pin-out charts, take a look at the following: 1993 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS w/ 4L60-E).

How to navigate to a different PCM connector?

To navigate to a different PCM connector, use the links below: C1 Blue. C2 Red . C3 Clear -or Grey- . C4 Black . Here are some very important safety precautions when testing the wires coming out of the PCM connectors.

Is it safe to use PCM pin out charts?

C4 Black . Here are some very important safety precautions when testing the wires coming out of the PCM connectors. 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?

What to look for in a connector pin out chart?

Because this is the clearest indication that these ARE NOT the Connector Pin Out Charts for your particular vehicle. 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. To see what this tool looks like: Wire Piercing Probe.