check gauges light comes on and voltmetr drops to zero.drains battery to the point engin will stop
Posted by healey1234 on
The PCM has the voltage regulator inside it that controls the charge from the alternator to the battery, unlike older vehicles that have the voltage regulator directly on the alternator. Also there is a battery temperature sensor under the battery that the PCM uses to decide how much to send the battery. Possibilities; bad alternator, bad PCM, bad battery temp sensor, bad battery, and bad connections. Battery tests are easy check when fully charged should get around 12.5v then turn on headlights for 2 minutes and check again should still be around 12v. To test charging system start engine and test at bettery terminals should get 13-15v if not then something wrong with charging system take alternator to advance auto and they will test it for free if its good you are down to connections, PCM and battery temp sensor. test battery temp sensor at 75 to 80 degrees fahrenheit should get 9000-12000 ohms resistance (9k-12K ohms) if thats good check ground connections on vehicle body , connections on alternator, and plugs into pcm as well as the two above it (depending on model and year). If all that is good your PCM is bad get one on the internet preprogrammed for your vin number for $250 if you get one at the parts store it is $250 and then you have to get it programmed about another $80. You can also test the alternator your self by disconnecting the 3 tiny nuts and removing the connection from the field terminals (plastic piece with two terminals) and checking again at battery for 13-15v ( stay away from pulleys and belt,no loose clothing or long hair if you value your health). The PCM shorts the field connectors to regulate the voltage so removing that connector eliminates the PCM , battery temp sensor and the wire to and from them.
Posted on Mar 07, 2009
1999 Grand Cherokee Limited Jeep anti-theft system had shut all electronics down and engine will not start. what can I do to reset the system....
The 1996 Jeep Grand Cherokee
Laredo Anti-Theft System is equipped with Vehicle Theft
Security System (VTSS). VTSS system monitors vehicle doors, hood,
liftgate and ignition. If an attempt is made to enter or operate vehicle
without proper disarming of system, vehicle horn will sound,
headlights, taillights and parking
lights will flash, and engine will be prevented from running.
The following wiring diagram and electronics circuit contains detail schematics of The 1996 Jeep Grand Cherokee Laredo Anti-Theft System. Herein you will find interconnection between electronics parts of the system such as body control module, auto headlamp light sensor. VTSS led, driver door module, passenger door module, cylinder lock switch, junction block, power distribution center, and grounding. Herein you will learn also how the Vehicle Theft Security System works, removal, installation, testing and troubleshooting procedures.
Also, remember that here can find the Jeep Grand Cherokee Service & Repair Manual.
Hope help with this.
Posted on May 03, 2010
where is the fuel shut off switch and how do I reset it
Jeep doesn't use fuel shut off switches. The fuel system is computer controlled with relays.
Posted on Oct 16, 2009
fuse box diagram 1996 jeep grand cherokee laredo. which fuse operates the interior lights?
Posted by catonaharl... on
For the Fuse Block, identification and description about even fuse, for your first step, review the ZJ-Secc-8W-Wiring-Diagrams (page 7, fig. 12).
I hope help you with this. Good luck (rated this).
Posted on Sep 08, 2009
where is the MAP sensor on 99 jeep grandcherokee 4.7 L 8 cylinder
Posted by myzshade2u on
On 4.7L the MAP sensor is located on the front of the intake manifold. An O-ring seals the sensor to the intake manifold.
(click over image for zoom)
Hope this helps.
Posted on Apr 27, 2011
My 1999 jeep grand cherokee horn started blowing and i had to put the fuse to stop it now my jeep will run for a few minutes then shut down or it wont start...
Posted by patrioticb... on
Alarm Module Reset Procedure
NOTE: This information applies to a Vehicle Theft Security System (VTSS) that was armed when the battery was disconnected and reconnected.
When the armed VTSS senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed following a battery reconnection.
The power-up mode will also apply if the battery goes dead while the system is armed and battery jump-starting is attempted. The engine no-run feature will prevent the engine from starting until the alarm system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System (VTSS) occurs when the vehicle is unlocked using the key to unlock either front door or the lift gate. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the Unlock button of the Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and the engine no-run feature), either disarming method will deactivate the alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will also disarm the VTSS, but the horn will sound and the lights will flash for about three minutes as part of the Panic feature. The horn and lights can be stopped by pressing any of the RKE transmitter's buttons or driving the vehicle above 15 mph.
Posted on Jan 28, 2009
GROUND CABLE CLAMP BROKE.HAD TO CUT CLAMP OFF AND INSTALL AFTERMARKET CLAMP.THERE IS A LOT UNDER THE INSULATION ON THE CABLE. I AM GOING TO REPLACE THE GROUND CABLE HARNESS AND WOULD LIKE TO HAVE A DIAGRAM FOR ROUTING NEW CABLE.
Posted by MIKE MIKE on
its just taped into the harness you should be able to run a new one along side the harness
Posted on Jul 12, 2012
Location of the Mass Air Flow Sensor? And how to clean it?
Posted by randy... on
Hi, the mass air flow sensor is on the intake tube just before the throttle body. these sensors are extremely sensative. there is a special cleaner that you can purchase at parts stores.
Posted on May 22, 2010
what does the error code P1494 leak detection pump mean and what do I need to do to fix it
Posted by Shirl... on
This fault code indicates there is a problem with the leak detection pump switch or a mechanical fault in the pump.
The leak detection pump is part of the evaporative emissions control system. It is part of the self-test system that makes sure the evaportive emission system is working properly. The pump applies vacuum to the system to check for leaks.
This code is set by the PCM when the switch for the LDP is found to be in the wrong position at start-up. This can be caused by a faulty switch in the pump or a mechanical failure in the pump - either way the pump assembly needs to be replaced to address the issue.
Clear the code with a code reader or by disconnecting the battery and drive the vehicle for a while to see if the code comes back. If the code comes back make sure to inspect all the wires for any type of short or issues before replacing the pump. The pump is located under the rear of the vehicle near the fuel tank. Dealer list on the pump is about $140.00. It should take less than an hour to switch out.
Your local trusty auto repair facility can perform a full diagnostic on the system to ensure that is your problem.
Posted on May 27, 2011
I have a 99 Jeep Grand Cherokee. While driving or sitting a light, the engine stops and the "trans over temp" light comes on. What does this mean?
Posted by Guest on
the transmission is over heated , check the fluid level and check that the cooling system is working correctly as there will be a trans fluid inter cooler which may not be operating correctly
Posted on Jul 17, 2014
3,832 questions posted
Usually answered in minutes!
Step 2: Please assign your manual to a product: