How to know if ignition switch failed? - Camry Toyota Cars & Trucks

If your 1997 Plymouth Breeze 2.0 is not starting and there's no spark, it is likely due to an issue with the ignition system. Here are some possible causes and solutions:

1. Faulty ignition coil: The ignition coil is responsible for supplying spark to the spark plugs. If it's faulty, there will be no spark. A mechanic can test the ignition coil and replace it if necessary.

2. Bad spark plugs: Worn or faulty spark plugs can also prevent the engine from starting. Check the spark plugs for any signs of wear or damage and replace them if needed.

3. Failed crankshaft position sensor: The crankshaft position sensor is responsible for providing the ECU with information about the position of the crankshaft. If it fails, the ECU won't be able to send a signal to the ignition coil to fire. Check the sensor and replace if necessary.

4. Failed ignition switch: If the ignition switch fails, the ECU won't receive the signal to send power to the ignition coil, and there will be no spark. A mechanic can check the ignition switch and replace it if needed.

I suggest taking your car to a qualified mechanic to properly diagnose and fix the issue.

Could be ignition switch problem or a stuck closed relay . Gm has had ignition switch problems . Your best bet , if you don't know how to test automotive electrical systems , mite be to take it to a qualified repair shop. With the electronic's on your vehicle ,really ,it could anything .The BCM - body control module controls most of the vehicle .
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition 0, Ignition 1, and Accessory.
To determine the correct power mode the BCM uses:
• The state of these signals
• The sequence of switch closures received by the BCM
• The status of the engine run flag

Fail-safe Operation
Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.
Serial Data Messages
The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals
Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.

Ignition switch ? Key an lock cylinder or the electrical part ? The vehicle keeps running or you can't turn key to off ! Different thing's come into play depending on which is your problem ! If vehicle doesn't shut off (keeps running ) You need to know how it works !
An ignition switch isn't the same as back in the old days , it's a low voltage input to the BCM .
Serial Data Power Mode
On vehicles that have several control modules connected by serial data circuits, one module is the Power Mode Master, PMM. On this vehicle the PMM is the BCM. The PMM receives 3 discreet ignition switch signals to differentiate which power mode will be sent over the Class 2 Serial Data circuit.
To determine the correct power mode the PMM uses the following circuits:
?€¢
Ignition 0

?€¢
Ignition 1 voltage

?€¢
Ignition 3 voltage

An you need a professional scan tool to deal with these problems !
Serial Data Messages The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid PMM message until they can check for the engine run flag status on the serial data circuits. If the PMM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is True, indicating that the engine is running, the modules fail-safe to RUN. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is False, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid PMM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, battery positive voltage, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.

It's possible that the switch has worn out. People tend to put to much **** on their key rings and believe it or not that added weight along with the constant use will wear out the mechanisms in the ignition switch. I've experienced this first hand with both my wife's car and my daughters car.

Sounds like the ignition switch is failing as I don't know anything else which can keep the engine running bypassing ignition switch.
CeraCoat-NanoTech.com

Check the safety neutralSwitch could be theCause of your deadtruck it is on the side of the trand

The solenoid has no fuse it is like a relay where a small power turns on a large switch. The small wire comes from your key and through the ignition box that is pushed by way of a metal rod from your key cylinder. Ignitions often fail slowly. You'll know if the ignition is getting bad if your dash lights flicker or fail to come on, your radio fails to come on, your horn doesn't work etc

you need to first install one of factory key into ignition.turn ignition switch on position for 5 seconds.switch off the ignition and remove key.wait 7 seconds insert new key into ignition switch.and switch ignition on until alarm system warning lamp will flash twice mean key programmed. switch ignition off if warning light illuminate for 3 seconds to confirm or flash 3 times indicate registration has failed. if you fail on programming new key let dealership reprogram new keys using diagnostic equipment.

it sounds like you may have an ignition switch problem. if no spark to coils this may be it ! There are two major parts of an ignition switch, which may fail, causing starting problems. Either the electrical switch fails or the lock cylinder mechanism fails. Any of these two failures may manifest themselves in the form of the following symptoms. The obvious symptom of a bad ignition switch is the refusal of the car to start. If the car battery and the alternator are ruled out for any problems, the culprit is mostly the ignition switch that may have to be replaced. This may occur because of problems with the lock cylinder or the underlying electrical switch. If you notice the discrepancy whereby the headlights switch on and the car horn is working, but the car won't start, you can be assured that the ignition switch is the source of the problem. So if you notice such a discrepancy, it's time to get the ignition switch checked or replaced.

The ignition switch it self may be going bad and may need to be replaced. If you have many keys on your key chain, this will promote the ignition keys to fail. The ignition switch's job became more complex as accessories like radios, electric windshield wipers and heater blower motors were added to vehicles. Moving beyond its original role as a simple on-off switch for the engine's ignition system, the ignition switch was also designed to supply electricity through an accessory position on the switch. This allowed accessories to function in a key-on, engine-off situation without overheating and oxidizing the contact points in the engine's distributor. As more accessories like power windows, power door locks, power seats, air conditioning and electronic automatic transmissions were added, the ignition switch's job became even more demanding.

Today, the ignition switch is a complex device that powers numerous electrical and electronic systems throughout the vehicle. In fact, the newest version of the conventional ignition key is an electronic device that identifies the driver and allows him to activate the starting system on demand.

Most ignition switches incorporate spring-loaded, sliding contacts to transmit adequate amperage to individual fuse and relay circuits. As these contacts begin to wear, they may lose their ability to make perfect mechanical contact. In other instances, they may begin to oxidize due to heavy amperage flow. In either case, the contacts begin to develop electrical resistance that reduces amperage flow through the ignition switch.

Very few ignition switches fail catastrophically. Most begin to fail intermittently and are usually sensitive to temperature and humidity. If the internal sliding contacts are heavily greased during assembly, the grease may begin to harden and inhibit mechanical contact during cold weather. If the switch fails during heavy accessory loads, the internal sliding contacts may have become heavily oxidized or succumbed to heat distortion and loss of mechanical integrity. In any case, most ignition switches give ample warning of an impending failure via intermittent ignition or accessory operation under various conditions of temperature and electrical load.

Good luck and hope this will lead you to addressed the issues your having with your car. Keep me posted, be glad to know you got your car running 100% again soon.