My 2.0td vitara starts good, drives well, but stops like turning off key. Engine management light comes on, but if leave car sit for 5 minutes, turn key, and runs perfect . Stop car, restart, all ok , with management light going out. Drive for sometime, then repeating the same problem. When the car stops, and try to start, cannot hear the electric fuel pump running, but leave for 5 minutes, then can hear! Have changed the electric stopper on fuel injection pump , which thout was faut, as drove great forwhile, but back with same issue!

If the security light is hot or flashing when the key is in the on position, most likely the ignition key tumbler housing has failed.

You can try resetting the pass code by turning the ignition switch to the on position (do not crank or start the engine). Leave the key in the on position for 10 minutes. Turn the key to the off position, wait 5 seconds and turn the key to the on position again and leave it on for 10 more minutes. Cycle the key to the off position again for 5 seconds the back on for a final 10 minutes. Once the final 10 minutes is complete, turn to the off position again, wait 5 seconds and now turn the ignition on and to the start position. The pass code has now been reset and it should start. If the reset does not work you will have to change the ignition key tumbler housing that contains the key code resistor.
Good luck

Temp.gauge really has nothing to do with the perfomance of the engine. If the car has been unused for a few hours, the engine oil etc settles down. It is good idea to let it run after a cold start so the oil circulates in the engine. Keep in mind it's a 1996 model and needs more care. Keep servicing regularly.

check the condition of the key battery as it may be low in cold weather and not communicating properly with the immobiliser.. I suggest this because batteries generally fail more often in cold weather compared to warmer climates.

check the relay

Code 1684 is not on the list for Chrysler cars, code 1687 is for the battery voltage dropping below 10 volts. This can occur if the voltage actually does drop below 10 or if the battery is disconnected from the computer.
It could be a wiring problem between the key switch and the main fuse box.

1. Perform a security system relearn.
2. Let the vehicle sit for more than 10 minutes with the key off.
3. Attempt to start the engine, leave the key in the run position monitoring the security system indicator.
4. After 10 minutes, the security indicator will change state.
5. Turn the key off and wait 10 seconds.
6. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
7. After the second 10 minute timer has expired, turn the key off for 10 seconds.
8. Attempt to start the engine. If the engine stalls, wait another 10 minutes with the key on.
9. After the 3rd 10 minute timer has expired, shut the key off for 10 seconds.
10. The security system will relearn on the 4th starting attempt and the engine should start and run.
If this doesnt work, you may have a failure in your system. If the security light is on, and the reprogram doesnt work, you might want to look into bypassing that antitheft system.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Here is the procedure for allowing system to run each of the separate mode tests.
EGR : Start engine and warm up completely. Make sure all electrical loads are off (A/C headlights, blower fan, and rear window defroster) Accelerate to between 49-57 mph and hold a very steady speed for 1 minute. Decelerate to a stop and turn off engine.
EVAP : Ensure Baro pressure is 21.3 inHg or higher, Intake air temp is 41-95 'F, Fuel tank level is between 25-75%, Battery voltage is 10.9-14.6 volts. Start engine and idle for more than 10 seconds then turn key to off. Leave vehicle to sit for 5 hours or more. Start engine and race to 3500 rpm to warm up completely the idle for more than 15 minutes. Accelerate and then drive vehicle at very steady speed between 40-50 mph for more than 5 minutes. Stop vehicle and turn key to off. Leave vehicle undisturbed for 20 minutes or more.
When I say steady speed in the above, try to keep dead on to a set speed to help ensure the test is run. Especially for the EGR as this is when the test will be performed and if speed/rpm is not very steady then test will not be performed. The Evap test will be ran during that final 20 minute or more sitting period (or should be anyway).

Hello! The Drive-Cycle is as follows...Check engine light off, codes cleared; cold start...Warm up engine 5 minutes...Drive (w/ steady throttle) at a steady speed between 40 and 60 mph for 8 min...Stop and idle 3 min...Drive (w/ steady throttle) at a speed above 20 mph for 2 minutes...Turn key off, leave off 10 min...

Guru.............Saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

ok here you go
make sure the battery is fully charged befor starting
turn ignition to run
attempt to start once then release the key in the run position
let vehicle sit with the key on for ten minutes
the security light should turn off
turn igniton switch off
wait 5 seconds
turn key to run position
let vehicle sit for 10 minutes
turn key off
wait 5 seconds
turn key to run position
let vehicle sit for ten minutes
turn key off
wait more than 6 seconds
and start engine

sounds like ecm lost signal from key