Thread: Cruise KR, and a lot of it.

Just replaced the relay, and still no start. Im completely lost.

I jump the relay and I can hear the fuel system prime and continuously run.

try bending that tab out again.

I did that. Still nothing.

- Installed new relay, crank no start
- Bent tab out on Fuel Pump Speed Relay, crank no start.
- Jump fuel pump relay #14, Can hear fuel system turn on and run. Installed relay with jumper too and fuel system running, crank no start.

I did just buy a brand new Relay and replaced it. Still nothing.

I only get the fuel system to turn on when I jump relay #14 with a wire.

Now I'm thinking the PCM isn't commanding the relay to open when the key is turned on.

I think it could be the theft deterrent code. Did you get the scanner to work?

P1626 Chevrolet Description
The body control module (BCM) produces the theft deterrent fuel enable signal when ignition is ON and the proper key resistor pellet is sensed. The powertrain control module (PCM) monitors the fuel enable signal during crank. If the proper signal is present on the theft deterrent fuel enable circuit, the PCM enables fuel delivery to allow the engine to start. If the PCM detects that the fuel enable signal is not present or incorrect while the engine is running, DTC P1626 will be set. DTC P1626 can cause a no-start condition or normal operation depending on when the loss of the fuel enable signal was detected. The engine will continue to start and run if the condition that set DTC P1626 occurred after the BCM sensed the proper key resistor pellet and signaled the PCM to continue fuel delivery. The engine will start and immediately stall if the condition that set DTC P1626 occurred before the BCM sensed the proper key resistor pellet. With this condition present, the PCM will inhibit fuel delivery and the BCM will disable the starter.

Like I said I get this code every time I flash the pcm. First thing I do is clear it before starting.

FIXED IT.

Before I called it quits for the day, I checked every single fuse in the fuse block. Found the ECM fuse was blown. (Must have been from disconnecting the PCM without disconnecting the battery).

Never thought to check that fuse, as everything worked like it should, besides the fuel system.

Anyways, replaced the fuse and car runs. ZZP PCM is in now, and we are back to where I left off. Time to do some scanning with the other PCM installed and see what readings I get.

Good job! Perseverance always pays off. Now get them scans. Inquiring minds want to know

damn fuses. lesson learned there. un hook the battery before you unplug a pcm or plug one back in.

Lesson learned the hard way.

Did some driving, car was still seeing upwards of 14.9* of cruise KR. My next decision, is to pull the trigger on two knock sensors now. Roughly $80 for them both, kinda expensive, but I'd assume that's the next step here.

iirc the last guy who had retarded KR for no reason had bad knock sensors. he changed them and bye bye kr.

Time to pull the trigger this week.

$46 a sensor from Autozone and I'll buy them both. Expensive, but gotta get this fixed.

Originally Posted by J57ltr

Ill send you pics of how I did it if you like. Just PM me


Jerf

The front looks self explanatory and easily accessible with a larger deep well socket.

I'm unsure on the back since a socket won't be able to fit getting to it, when looking directly up at it, so I'd like to know how you did it. You have a PM sir.

$68 for both at advance auto Use the 30% discount code

What's the discount code?