Car still won't start. need help ASAP
11-27-11, 05:22 PM
#17
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12-02-11, 09:43 PM
#26
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guys, i am at a loss
Car still has no spark even after replacing the entire ignition system and having my ecu re capped. I'm moving out of state in a week and hauling a dead car is too much of a hassle. I really want it up and running, but at this point it has travelled more miles on a flatbed than its been driven since I've owned it. I hate to sell it but I'm out of ideas. my buddy helped me go over all the electrical stuff. grounds, resistance, the components are new and should be getting power.
Today I broke down and took it into the dealership where I know a couple techs. after explaining everything to them and what's been done to try to remedy the no spark issue they were stumped as were the other techs we spoke with. at this point its gonna be $222 for 3 hours of diagnostics. the problem is I have to be out of my house Thursday and the movers are packing everything up Wednesday...unfortunately they won't be able to get diagnostics done at Lexus until Monday, possibly Tuesday and parts won't make it in time because everything new has to be purchased online, or ordered through Lexus.
If anyone has any wild guesses, insight, or unorthodox methods to get it running throw them out there.
Today I broke down and took it into the dealership where I know a couple techs. after explaining everything to them and what's been done to try to remedy the no spark issue they were stumped as were the other techs we spoke with. at this point its gonna be $222 for 3 hours of diagnostics. the problem is I have to be out of my house Thursday and the movers are packing everything up Wednesday...unfortunately they won't be able to get diagnostics done at Lexus until Monday, possibly Tuesday and parts won't make it in time because everything new has to be purchased online, or ordered through Lexus.
If anyone has any wild guesses, insight, or unorthodox methods to get it running throw them out there.
12-02-11, 10:03 PM
#28
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The crank and cam info comes from the distributor. its new and is turning when the car cranks. believe me I tried everything, had an ase mechanic triple check my work and explained to trained Lexus techs what is going on. we are all stumped. is it possible that the leaking capacitor messed up something else in the ecu?
12-02-11, 10:12 PM
#29
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ehhhh........sorta. The crank sensor or "engine speed sensor" is just as important.
The ECU monitors the engine condition by signals from each sensor, calculates the ignition timing and sends an ignition signal to the igniter. High voltage from the ignition is distributed to each spark plug in the appropriate order to generate a spark between the electrodes, which ignites the air–fuel mixture. IGNITERS
The igniter temporarily interrupts the primary current with the ignition signal (IGT signal) from the ECU and generates sparks at the spark plug. Also, as a fail–safe measure, when ignition occurs, an ignition confirmation signal (IGF signal) is sent to the ECU.
IGNITION COIL
The ignition coil uses a closed core coil with the primary coil wrapped around the core and the secondary coil wrapped around the primary coil. This allows the generation of a high voltage sufficient to cause a spark to jump across the spark plug gap.
DISTRIBUTORS
This correctly distributes high voltage to the spark plug of each cylinder in the specified ignition order.
ENGINE SPEED SENSOR
The engine speed sensor detects the crank angle.
CAM POSITION SENSORS
The RH and LH cam position sensors detect the cam angle.
The igniter temporarily interrupts the primary current with the ignition signal (IGT signal) from the ECU and generates sparks at the spark plug. Also, as a fail–safe measure, when ignition occurs, an ignition confirmation signal (IGF signal) is sent to the ECU.
IGNITION COIL
The ignition coil uses a closed core coil with the primary coil wrapped around the core and the secondary coil wrapped around the primary coil. This allows the generation of a high voltage sufficient to cause a spark to jump across the spark plug gap.
DISTRIBUTORS
This correctly distributes high voltage to the spark plug of each cylinder in the specified ignition order.
ENGINE SPEED SENSOR
The engine speed sensor detects the crank angle.
CAM POSITION SENSORS
The RH and LH cam position sensors detect the cam angle.
12-02-11, 10:16 PM
#30
Keeper of the light
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Further.....
Cam position sensors (G1 and G2 signals) and engine speed sensor (NE signal) consist of a signal plate and a pick up coil. The G1, G2 signal plates have one tooth each on its outer circumference and are mounted on the left and right bank camshafts.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pick up coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pick up coil. The NE signal plate has 12 teeth and is mounted on the crankshaft. The NE signal sensor generates 12 NE signals per engine revolution. The ECU detects the standard crankshaft angle based on the G1, G2 signals, and the actual crankshaft angle and the engine speed by the NE signals.
Diag. Code 12
RPM Signal Circuit (No.1)
Code No.
Diagnostic Code Detecting Condition
Trouble Area
12
ISSUE: No ”NE” or ”G1” and ”G2” signal to ECU within 2 sec. after cranking.
CAUSES:
• Open or short in engine speed sensor, No. 1, No. 2 cam position sensor circuit
• Engine speed sensor
• No. 1, No. 2 cam position sensor
• Starter
• ECU
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pick up coil change, causing fluctuations in the magnetic field and generating an electromotive force in the pick up coil. The NE signal plate has 12 teeth and is mounted on the crankshaft. The NE signal sensor generates 12 NE signals per engine revolution. The ECU detects the standard crankshaft angle based on the G1, G2 signals, and the actual crankshaft angle and the engine speed by the NE signals.
Diag. Code 12
RPM Signal Circuit (No.1)
Code No.
Diagnostic Code Detecting Condition
Trouble Area
12
ISSUE: No ”NE” or ”G1” and ”G2” signal to ECU within 2 sec. after cranking.
CAUSES:
• Open or short in engine speed sensor, No. 1, No. 2 cam position sensor circuit
• Engine speed sensor
• No. 1, No. 2 cam position sensor
• Starter
• ECU