93 Maxima, not starting

Ok,

93 Maxima, SOHC, 153k.

Replaced battery, and now the motor turns, but no spark and no fuel, hence no start. Any suggestions ? Working fine prior.

PS I have voltage at the injectors, but no spark. I have replaced coil/cap/wires/rotor etc etc, then realized I did not have fuel output either.

... no spark and no fuel, hence no start....

Engine Cont -relay not working (relay bad, stuck and/or ign key bad)?

When all is ok, turning ign key ON will cause fuel pump to start humming, fuel pressure to go up (hose stiffens) and mentioned relay to clic. Turning ign key OFF will cause the relay to clic off after '10 sec'. This means ECU gets power...

--->does this happen?

Check all related fuses, supply voltage and GND at ECU pins. Swap Engine Cont -relay (with any green colored).

Check http://www.cardomain.com/ride/748507/5 and page 14

.

Thanks for the great info! I'll grab my voltmeter & check, and will advise.

Again, thanks!

Ok, sorry for the long delay, but life gets in the way sometimes :-)

Using your link,

"Crank but No Start?
Measure +12V from MAF rightmost pin while starting: tells if ECU is alive. (if so, your pwr supply to ECU & ign sw is ok, points to inhibit switch: alarm, MT-clutch/AT-tranny sw)
.

ECU alive, engine cranks, fuel is supplied, but still no spark. Where is the inhibit switch? Also, where is the AT tranny switch? Thank you,

Ok, sorry for the long delay, but life gets in the way sometimes :-)

Hmm. Thats a lot walkin in deep snow... hope youre ok?

The tranny /inhibit sw: see page15. (This is one input prerequisite for ECU to initiate spark ctrl to the transistor/coil. See spark, page12)

The spark needs functional coil, transistor [good grounding] and ECU signal to trigger the spark. For this, campos timing signal is needed from distributor to ECU. Check for good distr grounding; see pages 9 & 10.

Hmm. Thats a lot walkin in deep snow... hope youre ok?



Thank you. Alright, just alot of work (which I'm thankful for).

I'll follow up again soon. :smile: