The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

**BP Automotive** · 01-11-2015, 04:55 PM

Ok, now you will want to check for Ground at the PCM, and power and ground at the tac module connector.

On the PCM Connectors cavities 1 and 40 should have a good ground on BOTH connectors.

On the TAC Module Connector Cavity 7 should be Switched Ignition, and Cavity 15 should be Ground.

Also, Have someone crank the engine while you check for power at Green 9

01-11-2015, 04:55 PM	#10
BP Automotive Registered User Join Date: Jan 2015 Location: Columbia, KY Posts: 26	Re: 81 c30.....5.3 Ok, now you will want to check for Ground at the PCM, and power and ground at the tac module connector. On the PCM Connectors cavities 1 and 40 should have a good ground on BOTH connectors. On the TAC Module Connector Cavity 7 should be Switched Ignition, and Cavity 15 should be Ground. Also, Have someone crank the engine while you check for power at Green 9