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Cars & Trucks Master
Re: lexus will not start
Hi there: You will have to pinpoint what the engine is missing... - Spark - Fuel - Compression
three of these are tested when the engine is being cranked over. There
are two way of checking for fuel. Fuel pressure and fuel trigger. Both
are very important and must be present for the engine to start. Fuel
pressure is self explanatory. You just hook up the gage and see what the
reading is. Fuel trigger is check with a noid light. The injector gets
unplugged and the noid light gets plugged in to the injector clip. With
the engine cranking over, this light must blink. This is the signal to
the injectors from the computer. You can have all the fuel pressure in
the world, but it wont matter if the injector is not pulsing gas into
the cylinder like it should.
Compression tester, spark tester,
fuel pressure gage and noid light are all accessible at your local auto
store. All three tests play a very important part in diagnosing a no
start condition. Be extremely careful when doing these tests.
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How many miles on the vehicle ? Thing's wear out , thousands of times of put the key in an turning it .
Have you tried to do a relearn ?
30 Minute Procedure
Ensure that the battery is fully charged.
Use a scan tool in order to clear the Passlock™ DTCs.
Turn the ignition switch from the OFF position to the CRANK position, and then to the RUN position.
The vehicle will start and then stall.
Leave the ignition ON until the security telltale turns OFF in 10 minutes.
Repeat Steps 3-5 for 2 more times (3 times total)
The Passlock™ controller will learn the new data on the next start attempt.
Use a scan tool in order to clear all DTCs.
Don't worry about the scan tool part , just do the relearn . If that doesn't work you will probably have to take it to a dealer .
DTC B2947 Security System Sensor Power CKT Low
DTC B2948 Security System Sensor Power CKT High
DTC B2957 Security System Sensor Data Circuit Low
DTC B2958 Security System Sensor Data Circuit High
DTC B2960 Sec Sys Sensor Data Incorrect but Valid
DTC B3031 Security System Controller in Learn Mode
DTC B3033 Security System Indicates Tamper
If the relearn doesn't work one of these DTC'S - diagnostic trouble code's is stored .
Try to start the engine, then release the key to ON, Engine will not start.
Watch the security telltale, after about 10 mins, it will turn OFF.
Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes. You must turn the ignition OFF for 30 seconds before attempting to start the vehicle after the 3 cycles. Then start the engine .
FLAT batterY?? Battery OK,now? New one? Old one OK?HUH? Get security codes FIRST: radio and NAV. Disconnect battery from car and wait for 30 seconds and turn on the headlight switch,DURING the battery disconnect. Turn off the headlights and reconnect the battery. the security system should "re-boot" and be happy. then there is the radio issue, Get the code.....
Some vehicles will allow you to start and drive (temporarily) by switching the ignition key between 'Off' and 'Run' or 'On' several times (common is three) in quick succession.
You would however, at least have to repeat it every time you wished to start the car.
Disabling the security system could be quite difficult since they really are intended to make a vehicle unusable.
There is a problem with the theft system. This is
the system that pervents the car from starting if the ignition lock
cylinder is damaged when someone trys to steal the car. You can try
and do a relearn, it may let the car start after this relearn. The most
common cause for this concern is the ignition lock cylinder, it has a
computer sensor inside that goes bad, you have to replace the cylinder
and program it. To reprogram/relearn, put on the parking brake(this
will keep the headlights from comming on and draining the battery), try
to start the car, leave the key in the "on" position. The security light
should no be flashing. Wait for tem mins, the light should turn off. At
this time, turn the key off for 2 seconds and try to restart. At this
point, the car may start, if not let the key stay in the "on" position
again for tem mins untill the light turns off. Again turn the key off
and try to start the car. It may take 3 times for the system to relearn,
if you try 3 times and still no start, you will have to replace the
ignition lock cylinder.
what you need to check is to see if the security light goes off when the key is inserted to make sure the key is still programmed to car when in ignition. Then the basics for a car starting: air, fuel, compression. couldbe alot of things but check the timing on the car, incase it jumped a tooth or timing belt broke. May need tune up: spark plugs. please post more information about problem with car. also check battery cables for corrision.
Sounds as though when your battery died the engine imobiIiser locked down. YOU MAY HAVE TO HAVE THE CAR TOWED TO A LEXUS DEALER AND HAVE THE MASTER KEY AND OTHERS REPROGRAMMED TO THE IGNITION...BUT If you have your wallet key as well , try taking all to the airport. HOLD the card to the dash beside the ignition for at least 20 seconds, then try turning the key several times. I haven`t done an LS but the failsafe when a remote fails is to hold the key beside the ignition for at least 20 seconds .... Also try the lock routine, but I think the issue is in dash..security needing to reboot to your key. My understanding is that the lock routine re initialises the lock setstings when power is restored
SOUNDS LIKE THE SECURITY SYSTEM ON THE CAR NEEDS TO BE RESET SOMETIMES THIS CAN BE DONE BY CYCLING THE KEY BACK AND FORTH IN THE IGNITION 3 TIMES THEN START IF THIS DNT WORK THEN CHECK WITH YOUR LOCAL TOYOTA DEALER FOR DETAILS
1. Start with key out of ignition, drivers door is open all others closed and drivers door is unlocked. 2. Insert key into the ignition (DO NOT Turn) and Pull key out. 3. Perform these steps within 40 seconds. A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles starting with lock. Use an even pace and try to go about one cycle per second. (1Cycle = 1 lock and 1 unlock). B. Close, then open drivers door. 4. Perform these steps within 40 seconds. A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles starting with lock. Use an even pace and try to go about one cycle per second. (1Cycle = 1 lock and 1 unlock). B. Insert the key in the ignition cylinder. C. Turn the ignition to ON (Do NOT Start) then back to OFF. D. Remove the key from the ignition. 5. Press any button on remote for a minimum of 1 second. System should now lock and unlock doors once.
6. Close and open drivers door. 7. Press any button on remote for a minimum of 1 second. System should now lock and unlock doors. Once to confirm programming, twice to indicate programming failed. 8. Repeat steps 5, 6 and 7 for additional remotes.