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what is a ccm and err?
Also is this a vin P engine or the vin J in a ZR1?
The vin J should have 48-55 PSI of fuel pressure and the vin P 41-47 PSI, so either way 30 psi isn't' enough. In order to change the fuel pressure regulator on the vin J, you must remove the intake plenum and fuel rail assembly, on the vin P remove the left fuel rail cover from the vehicle.
Ok, I thought this had an engine control module. nonetheless, the fuel pressure isn't enough and you didn't answer if this is a vin p or j.
Ok, I see the 8th digit is the engine P number.
that fuel pump should be putting out 41-47 PSI
the oil pressure gauge goes over the 1/2 mark after the engine runs for only 2 seconds?
Oh, I thought that 30 psi was the fuel pressure, sorry.
Ok back to the codes isn't this an OBDI and you are counting the check engine light flashes for codes?
I thought a and g ran the fuel pump. a and b is to retrieve codes. Let me double-check that a and g.
Yeah a and g is to run the fuel pump, https://www.obd-codes.com/faq/gm-aldl-connector.gif
Ok, I had a little trouble understanding what this meant, can yo correct the spelling or punctuation or whatever so I can understand it, " ran codes module 1 ccm 41 liss serial communication module 4 ecm ERR MODULE 9 71"
I get code 41 refers to a 1x reference circuit fault.
72 is loss of serial data.
I don't understand what is going on here. a and g is supposed to run the fuel pump. Hold on, let me check a different manual.
Ok, I see now, a and g are for CCM diagnostics.
Let me read this. Hold on.
Ok, this is what I read but nothing in there says what a to g does, I do see the terminal g n the diagram though.
This is what this manual says but I still don't understand why you are not retrieving codes from a and b?
Code 41 Cam sensor or cylinder select circuit fault ignition control (IC) reference pulse system fault or Electronic Spark Timing (EST) circuit open or shorted
Code 72 Gear selector switch circuit
optispark is the ignition and ecm is the engine control module. Are you asking me what these are or if these ma be the problem or what?
If this has the ignition timing wire that you unplug in order to check and adjust the ignition timing, make sure it isn't still unplugged.
Then check the fuses for the ecm.
See if the engine will continue to run for more than 2 seconds if you continue to spray small shots of starting fluid into the throttle body. If not, then the problem is most likely with the ignition. If it does run, then the problem is most likely with the fuel system. Let's ignore those codes for now.
Change the fuel filter.
Then clean the fuel injectors if it does run with the starting fluid.
Ok, check back with me Tuesday.