Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Located in Freeport, Bahamas and no certified or knowledgeable Lexus mechanic around.
For several weeks while driving dash console began to work intermittently. Also starter at times would seem as if it was locking up.
A week ago i bought a new battery (NAPA 880 CCA) and installed. When I started vehicle, got what sounded like a loud noise. Turned off vehicle and restarted again, this time without a problem. Drove to work and when ready to leave, vehicle turn over but wont start.
Towed home. Check for fuel pressure by opening screw on rail. seem low so i checked fuel filter and replaced because somewhat clogged.
Fuel pressure seem to improve at rail.
Pulled spark plugs on both side and no spark. Came across ScannerDanner on Youtube and followed his instruction on testing ignition coils and ignition igniters. Got spark from both ignition coils but cant get spark when cranking vehicle.
Brother have a working 1990 Lexus LS400 and a working engine and transmission pulled from a wrecked 1992 Lexus LS400 in sitting on a pallet in his yard.
borrowed his Crank sensor from working vehicle and tried on my vehicle. Still no spark and no start at coil or plugs except when doing test.
A friend who works at Catepillar told me that I need to jump pins and try to wash engine lights for code, but more than likely i have to test my Cam Shaft Sensors.
ScannerDanner responded on YouTube that the "Next step, we need to see if the ECU is alive by testing the 5v reference circuit."
Here's a free video where Paul walks us through a no start on a Chevy Cavalier. It shows how to check for a 5v ref. feed.
Do you have the definition for a Code 12 for those of us without pre OBD2 Lexus experience?
This video on the free channel is a 1991 LS400 with a no spark condition.
I'm not suggesting your's is going to be exactly the same, but I'm sure you'll find it useful.
This is a none bypass type ignition system. The ECU processes cam and crank signals then communicates this with the igniter. The reason I wanted to know about the 5v ref circuit is to make sure the computer is alive.
Checking for injector pulse would be helpful here too but some of these Toyota systems need the IGF signal (generated by a firing coil) for injection pulse to take place.
Yeah it's not a bypass system but he followed the igniter test vid and got spark. Could a rpm signal be imitated with a test light on these? I have the similar situation with the 2jz and tried test light to battery (+'ve) to crank sensor signal (KOEO)and the pump came on, only ones though, no spark.
