ZR-1 Net Registry Forums - View Single Post - Crank No-Start/Idle 91 ZR-1

Macroblock · 03-31-2025

I can confirm, I have been able to repair almost every C4 Corvette ZR1 ECM I've worked on. The few that are not repairable I strip for parts.

Based on the numbers, there are 10-15 ECM failures per year. Of the ones I've worked on, IC's U13, U15 and U4 are the most troublesome.

Baggy Toaster's ECM had a defective U13. In this instance I was forced to substitute his defective U13 with a discrete outboard microcontroller to perform the functions of this IC.

The difficulty with these ZR1 ECM repairs comes from lack of parts. There are none. More often than not, I am forced to invent a workaround for an ECM's specific failure. This is very time consuming.

Fortunately, I have a hardware and software background in electronics, so I was able to create a bench-top ZR1 ECM emulator, which provides much faster diagnostics than testing on-car.

My work comes with a 2-year warranty.

03-31-2025	#19
Macroblock Join Date: May 2020 Location: Windsor Posts: 41	Re: Crank No-Start/Idle 91 ZR-1 I can confirm, I have been able to repair almost every C4 Corvette ZR1 ECM I've worked on. The few that are not repairable I strip for parts. Based on the numbers, there are 10-15 ECM failures per year. Of the ones I've worked on, IC's U13, U15 and U4 are the most troublesome. Baggy Toaster's ECM had a defective U13. In this instance I was forced to substitute his defective U13 with a discrete outboard microcontroller to perform the functions of this IC. The difficulty with these ZR1 ECM repairs comes from lack of parts. There are none. More often than not, I am forced to invent a workaround for an ECM's specific failure. This is very time consuming. Fortunately, I have a hardware and software background in electronics, so I was able to create a bench-top ZR1 ECM emulator, which provides much faster diagnostics than testing on-car. My work comes with a 2-year warranty.