Question about 2002 Harley Davidson FXST Softail Standard

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My 02 fxst will crank but wont turn over checked coil spark plugs ?

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  • Harley Davidson Master
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Hi Anonymous, and the usual suspects are:
1.Ignition/Light Key Switch not in IGNITION position.
2.Engine Stop switch in the OFF position.
3.Discharged battery, loose or corroded connections check negative cable at BOTH ends. (solenoid chatters).
4. Bank Angle Sensor tripped and Ignition/Light Key Switch not cycled to Off and then back to on.
5. Starter control circuit, relay or solenoid faulty.
6. Electric starter shaft pinion gear not engaging or over-running clutch slipping.
7. Security alarm not disarming
For a prime suspect please visit website below and good Luck.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...
Set Change Override Transport Harley Security Alarm PIN Code No Key Fob...

Posted on Jun 17, 2015

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Posted on Jan 02, 2017

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  • 5370 Answers

SOURCE: i have a 02 dyna

It can also be faulty spark plugs or worn out spark plugs causing this.Also it can be low voltage battery.causing this.Disconnect the battery for 15 minutes then reconnect and check if its helping to reset the no start problem.Also check battery voltage.It should be 12 volts on meter. -------- How to test the coils on Harley Davidson Dyna 2002:-- The engine should be cool. There are two large coil terminals and two small terminals.Measure small terminals with meter set set on "RX1" and measure large terminals with meter set on "RX1000" First remove the two wiring connection on the spark plug.Just disconnect it.Then remove the small connections on the coil.This connections are screw tight.So remove the screws. Now with the meter measure the ohm reading.The reading between the two small connections of coil terminals.The reading should be between 2.6 to 3.0 ohms.----------- Now measure the large terminals.The reading should be between 10000 to 12500.If the reading is not between this then coils are faulty and coil pack needs to be replaced. ------------ How to test crank sensor on Harley Davidson Dyna 2002:-- The crank position sensor is located in front of the oil filter on the left side of the engine in front. Put an oscilloscope on the sensor leads and spin the engine. You should see a pulse coming from the sensor.The CKP sensor has a B+ power supply, a ground, and a signal circuit.As the crankshaft rotates, the wheel teeth interrupt a magnetic field produced by a magnet within the sensor. The sensor's internal circuitry detects this and produces a signal which the ECM reads. The ECM uses this signal to accurately measure crankshaft velocity which is a variable used in order to detect misfire, spark and, fueling.--------------- Find the wire that goes to the B+ Measure from this wire to ground for the DC supply voltage. Measurement should be taken on the sensor side of the connector. Ground connection as well.On Dyna 2002 this wire is marked BK for Black. Do this test at rest and with the engine spinning. A loose connection could break as the motor shakes.If you have voltage present with the key on and with the engine spinning move the positive meter lead to the Signal wire. This is marked R for Red on 2002 Dyna. With the engine spinning you should see a voltage signal on that wire. You should measure the signal at the sensor connector and the ecm to verify it is reaching the brain.-------- Also with meter you should get this reading on crank position sensor:--- constant 5vac with the plugs out and 3.2vac with the plugs in.If this is the reading you get then its proper crank shaft position sensor.But if you get contact 5 vac with or without plugs in then its faulty crank sensor. ---------------- For ignition module testing check for the 12 volts on main ignition live wires.If its 12 volts when key is turn on and no volt when its turned off.Then its proper voltage and good ignition module.But if its 12 volts in both on and off then its faulty module causing this problem. -------------- This should help.Thanks.Helpmech.


Posted on Jan 20, 2011

  • 218 Answers

SOURCE: bike ran fine all day,

you can take the ignition modual to a parts store and they can test it but it might be the rectifier that went bad

Posted on Jul 20, 2011

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check the flasher maybe its not working or check the fuse of your turn lights.

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Hi Michel, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
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5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
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Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks.

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There is no simple answer, there are to many variables. If you have access to a scan tool, pulling the codes should help. Without them its back to old school hunt and peck method. At this point we need to narrow down the problem. You need to test for spark.
  1. Tag and disconnect the spark plug wires from the spark plugs.
  2. Remove the spark plugs and install the spark plug wires to each spark plug.
  3. Ground (do not hold spark plug) the spark plug; check if spark occurs while engine is being cranked.
Crank the engine for no more than 2 seconds at a time to prevent flooding the engine with gasoline.
If you have spark, You will want to make sure you have fuel injector pulse, along with fuel pressure. If you have spark ..simply spray some starting fluid in through the air filter and hold the gas pedal to the floor and crank it over while spraying. If it fires up, you know it is fuel related( fuel pump, regulator, or ECM if no injector pulse) . If you have no spark then look at ignition coil connection and trace through to the distributor( if equipped ). The crank shaft sensor has a tendency to fail on these as well. This should give you a few things to test and check to start you on your way to narrowing it down. If you have no spark then look at ignition coil connection for power and trace through to the distributor( if equipped ). If it is DIS( no distributor). It may be the Crank sensor or the ECU. The crank shaft sensor has a tendency to fail on these as well.
The ECU uses the signal sent from the Crank sensor to trigger the spark and fuel injectors. ( make certain you have checked all fuses)

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ENGINE TURNS OVER BUT IT WONT START


There is no simple answer, there are to many variables. If you have access to a scan tool, pulling the codes should help. Without them its back to old school hunt and peck method. At this point we need to narrow down the problem. You need to test for spark.
  1. Tag and disconnect the spark plug wires from the spark plugs.
  2. Remove the spark plugs and install the spark plug wires to each spark plug.
  3. Ground (do not hold spark plug) the spark plug; check if spark occurs while engine is being cranked.
Crank the engine for no more than 2 seconds at a time to prevent flooding the engine with gasoline.
If you have spark, You will want to make sure you have fuel injector pulse, along with fuel pressure. If you have spark ..simply spray some starting fluid in through the air filter and hold the gas pedal to the floor and crank it over while spraying. If it fires up, you know it is fuel related( fuel pump, regulator, or ECM if no injector pulse) . If you have no spark then look at ignition coil connection and trace through to the distributor( if equipped ). The crank shaft sensor has a tendency to fail on these as well. This should give you a few things to test and check to start you on your way to narrowing it down. If you have no spark then look at ignition coil connection for power and trace through to the distributor( if equipped ). If it is DIS( no distributor). It may be the Crank sensor or the ECU. The crank shaft sensor has a tendency to fail on these as well.
The ECU uses the signal sent from the Crank sensor to trigger the spark and fuel injectors. ( make certain you have checked all fuses)

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