Quote:
Originally Posted by brontotx
RF - thanks for the latest diagram. I now realize that the your statement about "both pins measuring 12V" that I originally disagreed with was because you were measuring the voltage with the connector attached to the injector. I normally disconnect things since it can be tough to get a probe on the terminals when connected - I assumed (the old ass out of you and me adage is correct in this instance) you were probing the connector when disconnected, which would show only 12V on the red or white wires of the terminals and an open circuit across the connector terminals like I stated. So, in retrospect, your statements are correct when measuring with everything connected and mine are also correct when disconnected. BTW - all your diagrams do ROCK!
cjracing: You are correct that that the ECM requires both a starter signal and oil pressure signal to fire the injectors, however, my understanding is that the oil pressure signal is not required when starting/cranking. That is, when cranking in START, the ECM sees the signal from the starter and doesn't look at the oil pressure as it realizes that the engine's oil pressure may not have built to a sufficient pressure as yet. Once started and in RUN, the ECM requires oil pressure to continue to fire. However, getting back to the start sequence, the ignition module signal to show the engine is spinning is also required by the ECM before firing the injectors. That is, if the ECM were to fire the injectors and the engine wasn't spinning, there would be a bunch of gas being introduced into the TB and manifold that could ignite out of the firing sequence - bad news. In summary, in START, the ECM requires the starter signal to tell it to ignore the oil pressure, but also requires an ignition module signal to tell it the engine is spinning before firing the injectors. In RUN, the ECM requires both the oil pressure and ignition module signals before firing the injectors. Hopefully this is now clear (as mud, I'm sure).
Mark
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Thanks - LOL yes, back probing injectors while they are connected is a bit tough but with skinny probes it can be done. Alternatively using small grabber style probe leads will do the same trick. Case closed - but we still have a problem with no start.
1227747 ECM uses starter motor (aka cranking) signal and DRP signal from dizzy to enable start up sequence, which includes enrichment sequence if CTS indicate cold coolant temperature. Now, the oil pressure signal is really a fuel pump voltage monitor. In these early EFI systems GM put a primitive back to keep fuel pump operating by installing (normally open - NO) oil pressure switch in parrallel with FP relay contacts. If FP relay fails, but as long as oil pressure is above 4-6 PSI the oil pressure switch will keep current flowing to the fuel pump.
FP relay (kinda) gets tested during POST sequence - ignition key off - on. SES light will go from on - off - steady on if all is well until engine starts. During POST ECM will try to power FP for about 2 seconds and shuts off. However, ECM monitors the FP relay switched side voltage when DRP are present and will set Code 54 if the voltage is low.
Official description------------>
Powertrain Controls - ECM/PCM
Code 54 Fuel Pump Circuit
CODE 54 - FUEL PUMP CIRCUIT (LOW VOLTAGE)
CIRCUIT DESCRIPTION :
The status of the fuel pump CKT 120 is monitored by the ECM at terminal "B2" and is used to compensate fuel delivery based on system voltage. This signal is also used to store a code if the fuel pump relay is defective or fuel pump voltage is lost while the engine is running. There should be about 12 volts on CKT 120 for at least 2 seconds after the ignition is turned, or any time reference pulses are being received by the ECM.
Code 54 will set if the voltage at terminal "B2" is less than 2 volts for 1.5 seconds since the last reference pulse was received. This code is designed to detect a faulty relay, causing extended crank time, and the code will help the diagnosis of an engine that "Cranks But Will Not Run."
If a fault is detected during start-up, the "SERVICE ENGINE SOON" light will stay "ON" until the ignition is cycled "OFF".
//RF