73-87 Chevy _ GMC Trucks > Electrical

ECM 1 fuse blowing 1987 chevy

<< < (6/6)

Yellowcat:
The green and white wire going to the fuel pump relay is coming only from the ECM? If it is and the ECM is faulty?

bd:
With the fuel pump relay connected to its wiring harness, will the fuel pump run as long as you feed B+ to the RED/WHT pigtail?  Using an incandescent test light clipped to a good, clean ground (not your voltmeter), probe the DK GRN/WHT wire connected to the relay and start the engine.  While the engine is cranking and running, does the DK GRN/WHT wire illuminate the test light?

Yellowcat:
The fuel pump will not run when I put B+ to the pigtail when engine is not running. When I grind the engine10 to 15 seconds to finally get it running I probe the red and white striped pigtail wire it is hot. I posted a video of this. I probed the green/white when engine us running and it does not illuminate the test light.   https://youtube.com/shorts/v3nxZngrtwk?si=O65XhmUublzyfdTf

bd:
Reference and familiarize yourself with the diagnostic charts that I previously posted.  Verify perfect power and ground continuity to the ECM.  Check continuity of the DK GRN/WHT wire between the ECM and fuel pump relay.  Clean the harness connections to the ECM using some DeoxIT D5 or CRC QD Electronic Cleaner, etc.  You may need to very carefully re-tension the terminal connections to the ECM and verify that none of the terminals are distorted, broken, or heavily corroded.

Navigation

[0] Message Index

[*] Previous page