Question about 1992 Jeep Cherokee Sport

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Battery has full charge; no power to fuel pump and ignition coil

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Check your auto shut down relay you can usually swap it with like your a/c relay or sumthing else

Posted on Sep 14, 2010

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Replaced bad fuel pump. Still will not start. Only 6 volts at the pump relay. Bypassing the relay indicated pump is working and plenty of pressure. Checked all the fuses all are good. Any ideas?


Year make and model ?
You should have two hot circuits to the relay. One is for the pump and the other is for the coil of the relay. Usually power comes from the key switch.

Jan 01, 2016 | Cars & Trucks

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Engine electricals




3) Spark: From battery to spark plug

The battery is the source of stored electrical power in the vehicle. A voltmeter between the terminals of a healthy battery should read 12.5 volts. A reading of 12.2 volts indicates a flat battery and a reading of 10.4 volts indicates a dead cell (each cell beingabout 2 volts). A battery should be capable of sustaining high current, as needed by the starter motor when turning the engine over. When the car is running the voltage measured across the terminals shouldbe between 14.2 and 14.5 volts. The value is the voltage being supplied to the battery by the output charge from the alternator. THis charging voltage should not alter much when additional load is applied to the battery (head lights on etc).
When the ignition key is turned to the second position,often referred to as 'key on engine off', all car functions are powered up including lights and fuel pump. When the key is turned to position 3 many ancillary functions are temporarily interrupted to allow the battery to meet the extra needs of the starter motor. Electrical charge from the starter switch passes through a master fuse and starter relay before energizing the starter solenoid. The starter solenoid moves the pinion gear on the starter motor to engage with peripheral teeth of the flywheel. Simultaneously, heavy copper contacts are bridged by this same movement causing the starter motor coils to become energized thereby turning the engine over.
During the ignition process electrical charge passes through the primary windings of the ignition coil(s). The engine control unit (ECU), taking signalsfrom the engine crank position sensor, collapses the field of the coil(s) appropriate to the cylinder requiring ignition. As the field collapses the secondary coil windings discharge very high voltage through the high tension lead to the spark plug. The charge is so high that at the spark plug gap the charge jumps across with a spark. The compressed fuel air mixture in the cylinder is ignited by this spark.
Checking the spark process starts with the plugs. The condition of the removed plugs reveals a lot about the nature of the ignition within the cylinders. Dark sooty deposits indicate overly rich fuel air mix and glazed plugs indicate overly hot lean mixtures. Removing the plugs (with the fuel pump relay unplugged) and holding the screw threads to the cylinder head whilst turning the engine over will reveal the quality of spark. The spark holders and leads should be examined for discharge through the insulation to the cylinder head. Removing the leads from the coil should reveal sparks emanating from the exposed connectors. Failure to see sparks at this point indicatesa failed coil (especially if neighboring coils show good spark) or a failed crank sensor if all coils show no spark.
NEXT 1.1 MAF Mass Air Flow sensor

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

I have a 1988 ranger no spark no fuel pressure iv replace the coil what could the issue be


Is it Fuel injection and electronic ignition, or still distributor and carb?
if its FI, check the fuel relay, located in the fuse box usually, not sure where for your truck specifically, but if you locate it, tap on it a few times while someone else cranks the truck, also, the fuel pump could be faulty, can you hear the winding noise when you turn on the ignition, if not, then pump is gone.
The spark issue is a tricky one since you said you have replaced the coil... spark wires ok? coil installed properly? battery charged and leads tight? alternator working? if alternator is failing to charge the battery, then it gets to a point where you dont have enough power to make the coil spark, the engine will crank, but not enough current (amps) to fully charge coils to deliver healthy spark.

Good luck...

Aug 19, 2011 | 1988 Ford Ranger

1 Answer

95 astro has no spark to the coil what next


Try this tips:
1. Check the battery voltage at the battery with the digital volt/ohm meter. Set the meter to "Volts D/C" and touch the black meter lead to the negative battery post and the red meter lead to the positive post. A fully charged battery will measure 12.7 volts or more. A measurement of 12.5 volts is considered discharged, and the battery should be charged before any further testing. Any measurement below 11 volts indicates a severely discharged battery--the battery is most likely damaged and should be replaced. If the battery measures above 12.7 volts, proceed to the next step.

2. Check the starter for battery voltage by touching the red (positive) meter lead to the battery cable terminal on the back of the starter and the black (negative) lead to the chassis. The voltage reading should be approximately the same as the measurement at the battery. If the reading is lower than battery voltage, check for bad connections at the cables on the battery and the starter or ground cable.

Check for ignition switch signal at the purple wire on the back of the starter. When the key is turned to the "Start" position this wire should measure battery voltage. If the reading is less than battery voltage, or zero volts, check the fusible links (orange wires) on the back of the starter. If the fusible links are intact and not burned or broken, replace the ignition switch. If battery voltage is present at the purple wire, and the starter doesn't turn, replace the starter. If the voltage measurements at the starter are correct, and the starter cranks the engine over when the key is turned to the start position, proceed to the next step.

3. Remove the air duct attached to the throttle body, and spray a liberal amount of the carburetor spray into the throttle body. Replace the hose, and try to start the engine. If the engine starts, the fuel pump is not supplying fuel or the ignition module is not pulsing the injectors. Check the fuel pump fuse located in the under-hood fuse block. If it is good, check for power at the fuel pump electrical connector located near the rear of the fuel tank on the driver's side of the van. In the Chevy Astro van, power is supplied to the fuel pump by the the gray wire on the electrical connector when the engine is being cranked. If power is supplied, hitting the fuel tank with the flat side of a hammer while someone else is turning the ignition key to start will sometimes bump the fuel pump enough to allow it to start. If the fuel pump checks good, proceed to the next step.

4. Check for spark. Disconnect the coil wire at the ignition coil, and try to start the engine. If no spark occurs, replace the coil and ignition module. If a strong spark occurs, plug the wire back in, and remove a spark plug wire from a spark plug and repeat the test. If a spark is not present, replace the spark plug wires, and distributor cap and rotor.


Keep us updated.

Jan 12, 2011 | 1995 Chevrolet Astro

1 Answer

My 1985 2.5 s-10 wont spray gas through the throttlebody but pumps from the fuel pump what would make it do this i can straight wire it to the battery and it will spray someone told me it could be the...


Using a test light, and with the ignition key in the "On" or "Run" position check for full battery voltage at the (+) positive side of the ignition coil, and then check for full battery voltage at the wire connector to the distributor for the wire that runs between the (+) positive side of the ignition coil and the distributor. (dis-connect the wire connector from the distributor to test) If full battery voltage is present at the (+) positive side of the ignition coil but not through the ignition coil to the distributor then replace the ignition coil. If full battery voltage is present at both the ignition coil and the distributor then remove the ignition module from the distributor to have it tested and most auto part stores will test it for you for free. The ignition module is what generates the signal that the ECM uses to time and fire the fuel injectors, and be certain that the ignition module is installed into the distributor using a silicone grease or some other die-electric compound to completely cover the metal mounting surface of the ignition module because it is a heat-sink, and be careful not to over-tighten the ignition module or it can be damaged. There is also a hall-effect switch inside of that distributor that would be the next suspect if the ignition module tests out alright, and if there is no spark there is a pick-up coil/stator assembly that could be faulty and if that is the case then replace the entire distributor because the distributor will have to be removed and dis-assembled to replace the pick-up coil/stator assembly.


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Nov 30, 2010 | 1985 Chevrolet S-10 Blazer

1 Answer

Car does not want to start ignition if trying tom start just click's thats it




There are some possibilities which you will have to check in this case:--

1) First of all check the power and voltage to the battery. With meter it will show exact 12 volt if the battery is charged. If the voltage is less get the battery charged at local auto repair shop. If the battery is internally drained and not getting charged then its time to replace the battery.

2) When you crank the car do you see spark coming at the spark plug? If no then its time to check the spark plugs and coil pack. If the spark plugs are not worn out and looks new then its time to check coil pack. The spark plug gets power to spark from coil pack.

3) The other thing to check in this case is the starter solenoid of the car. If the battery is charged and you start the car then it gives power to the starter to start the car. But if starter is faulty or not connected properly then car will not start.

4) The other thing to check in this case is fuel in the car. If there is fuel in the car then check the blockages in the fuel pump if the fuel pump looks proper then check the fuel filter above the fuel pump.

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Keep updated if anymore query .Thanks.



5) If all the above possibilities mentioned above checked out OK/perfect then it's a electrical issue and the wiring's in the car needs to be checked. The car gets power from the battery to get started. so the wires from battery needs to be checked one by one.

Oct 18, 2010 | 1997 Ford Escort

2 Answers

Turns over but wont start


There are some possibilities which you will have to check in this case:--
1) First of all check the power and voltage to the battery. With meter it will show exact 12 volt if the battery is charged. If the voltage is less get the battery charged at local auto repair shop. If the battery is internally drained and not getting charged then its time to replace the battery.
2) When you crank the car do you see spark coming at the spark plug? If no then its time to check the spark plugs and coil pack. If the spark plugs are not worn out and looks new then its time to check coil pack. The spark plug gets power to spark from coil pack.
3) The other thing to check in this case is the starter solenoid of the car. If the battery is charged and you start the car then it gives power to the starter to start the car. But if starter is faulty or not connected properly then car will not start.
4) The other thing to check in this case is fuel in the car. If there is fuel in the car then check the blockages in the fuel pump if the fuel pump looks proper then check the fuel filter above the fuel pump.
5) If all the above possibilities mentioned above checked out OK/perfect then it’s a electrical issue and the wiring's in the car needs to be checked. The car gets power from the battery to get started. so the wires from battery needs to be checked one by one.


Thanks. keep updated for any more query.you can rate this solution and show your appreciation.

Aug 10, 2010 | 1995 Nissan 240SX

3 Answers

1989 astro van turns over will not start seems not getting fuil gas tank full


#1 NEED TO VERIFY SPARK AT SPARK PLUGS # 2 CK FUEL PRESSURE AT SCHRADER VALVE ON FUEL RAIL ,,PRESSURE DEPENDS ON TYPE ENGINE ....IF NO SPARK AT SPARK PLUGS CHECK SPARK FROM COIL WIRE , IF NO SPARK AT COIL ,CHECK VOLTAGE TO IGNITION COIL SHOULD BE 12 VOLTS, IF NO VOLTAGE AT COIL ( KEY ON ) CHECK FUSES THEN IGHITION SWITCH. IF NO FUEL PRESSURE AND FUEL PUMP RUNS REPLACE PUMP .. CK VOLTAGE TO FUEL PUMP WHILE CRANKING . CK USING PUMP GROUND WIRE AT THE PUMP CONNECTOR THIS WILL PROVE GROUND ALSO. USE TEST LIGHT TO VERIFY

Aug 07, 2010 | 1989 Chevrolet Astro Cargo

2 Answers

Wont strat


Hello thank you for using FixYa.com for your answer my name is David.
You say it wont start in the normal way by just turning it on but if you pour gas in the throttle body
it will start sounds like you have a weak fuel pump most likely but there are a few other things that could cause it also .

1 Inspect Battery Damaged or faulty battery and/or connections. grey_line.gif 2 Inspect Coil - Ignition Damaged or faulty ignition coil or ignition coil circuit. grey_line.gif 3 Inspect Fuel Filter Clogged or dirty fuel filter grey_line.gif 4 Inspect Fuel Injector Pressure Regulator Faulty fuel injector pressure regulator or circuit. grey_line.gif 5 Inspect Fuel Pump Improperly functioning fuel pump or circuits. grey_line.gif 6 Inspect Wireset Damaged, worn, or deteriorating spark plug or coil wire(s). grey_line.gif 7 Inspect Control Module-Ignition Faulty ignition control module or circuit. grey_line.gif 8 Inspect Solenoid Switch Damaged or faulty solenoid switch or solenoid switch circuit. grey_line.gif 9 Inspect Starter Damaged, worn, defective, or faulty starter or starter related circuit. grey_line.gif 10 Inspect Neutral Safety Switch Damaged or faulty neutral safety swittch or circuit. grey_line.gif 11 Inspect Air Charge Sensor Damaged or faulty air charge sensor or air charge sensor circuit. grey_line.gif 12 Inspect Fuse Corroded, burned, or shorted fuse may be interupting power source. grey_line.gif

Nov 08, 2008 | 1988 Chevrolet C1500

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