2012 Chevy Cruz No Start
Hi everyone I'm working on this Corolla. The symptoms is crank no start no spark. I get power and ground at the coils and also 5v ref with the ignition switch on but no spark. The only code store in the ecu is p1604 startability malfunction. Any help will very much appreciate thank you in advance
CKP sensor? Look at data, Do you have rpm during cranking?
I mean I didn't look at data while cranking but I do see the needle move so I take it as the ckp signal is there
Yes I see the tachometer bounce which I assume I do
Treat it as a "cranks/no start" problem. Does it have fuel pressure? Injection pulse, spark, trigger to the ignition coils or coil" If not, then follow the trail to its source. Spark trigger & injection pulse start at the CKP. Your scan tool is a very valuable tool in a case like that. When you have exhausted the scan tool, then fire up the scope to do the pinpoint testing.
Thank you so much I had that in mine. I already check fuel pressure, i just don't get no spark . So I was thinking about going the ignition way . I have power and ground at the coils. And 5v as well I'm gonna check for control at the coils and also fuel injector since my fuel pressure is checked and appears to be ok . I'm gonna trace the spark from ignition coil to ecu and ckp
Sir, Good morning I hope this message finds you doing well. Attached is Lab Scope Screen Shot of Toyota's Ignition. You mentioned you have Power, Ground and 5 Volts but this Ignition System has both IGT & IGF ( see attachment). If IGT, the signal from the computer to the coil isn't present the coil won't fire. If IGF, the signal from the coil back to the computer isn't present the coil won't…
Well I believe I the the igf . If I'm not mistaken the igt supose to be present whe cranking . The 5v I get from the coil is igf . Am I right please correct me
Thank again for the scope file
Any trigger signal from the ECU to the coils ? Maybe you can Check the coils with active test on scanner. Or you can try to replace that coils with another coil with the same vehicle. Good luck
I try replace one of them still not firing
I would suggest not taking anything for granted. I would strongly recommend that you start at the beginning. I realize you have activity at the tach, but you really should look at scan tool data and see that you have an RPM signal. I have seen really crazy things. For example, I have seen situations where a weak CKP signal looks ok on a scope due to the tech using "auto" setting, but the voltage…
Thank you that happened to me before I'll keep your advice in mind
In this capture is from a 2016 Toyota Corolla 1.8 CH A is the ckp sensor cranking voltages. CH B is the intake cmp CH C is the exhaust cmp