Quote:
Originally Posted by asphaltgambler
I will add that your service manager is correct. All late model vehicles energize the fuel pump briefly before actual crank. Some by unlocking with key fob, or when the fob is near / in the 'slit' with your foot on the brake pedal. This ensures correct line pressure at initial crank.
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Not on the GX470. The ECM will not engage C/OPN relay unless two conditions are true, 1) key asks for a start, and 2) during start cranking there's a signal from the crank sensor. Both must be there for the ECM to engage the relay and to start-up the EFI side (injectors and spark). Once it starts running the ECM switches from start-mode to run-mode.
This unknown snafu of #1 and #2 is the reason why the C/OPN relay appears to be not working if you just turn key from off to run/on.