Welcome to the jeepExperts.com in-depth web page on WJ Generation Jeep Grand Cherokee tire stress monitor techniques. We have organized as a lot data as we might discover right into a useful article under. Is one thing incorrect or lacking? Please get in contact with us and we’ll repair it!
DESCRIPTION AND OPERATION
The Tire Pressure Monitor System is a security and comfort characteristic that was launched at first of the 2002 mannequin 12 months. It was provided as an choice on all WJ fashions besides the Laredo Sport. Each of the automobile’s wheels have a valve stem with a stress sensor and radio transmitter inbuilt. Signals from the tire stress sensors are obtained and interpreted by the EVIC. A sensor in a mounted wheel will broadcast its detected stress as soon as per minute when the automobile is shifting quicker than 25 mph. The spare tire sensor (if outfitted) will broadcast as soon as each hour. Each sensor’s broadcast is uniquely coded in order that the EVIC can decide location.
The system is able to displaying precise tire stress ranges for all 4 tires and the spare, is correct to inside +/- 1 PSI underneath all circumstances, unaffected by uneven loading or trailering, unaffected by slippery street circumstances, and is ready to monitor tire stress whereas the automobile is at relaxation. Each tire transmitter is battery powered. The battery life is projected to final 7-10 years underneath regular working circumstances.
The system identifies the placement of the 4 mounted tires by the use of a easy preliminary coaching course of. The EVIC is put right into a programming mode whereas a magnet is momentarily positioned, in sequence, on every of the valve stems. A sign is shipped again that identifies the LF/RF/LR/RR tire places in addition to the spare (if outfitted). This is a straightforward course of that may be achieved by anybody, and is defined intimately under.
If the spare is moved and mounted on the automobile, the show will chime and show for 5 seconds the message “Spare swap detected”. So how does the system know the spare has been switched? The spare tire transmitter is programmed to ship a sign hourly. Any and all mounted wheels, when spinning above 25 MPH, will transmit their sign each minute. The system will detect that the tire beforehand programmed because the spare was mounted on the automobile when the sign from that tire adjustments from hourly to each minute.
The valve stem transmitters might be simply put in into any wheels that match the WJ’s, whether or not manufacturing unit or aftermarket. The spare may also be mounted atop the automobile and nonetheless be reconized as such by the system. As properly, a set of extra transmitters might be bought to put in right into a set of various tires for these house owners who usually change their wheels and tires for off-roading. Note that particular Training is required if you’re utilizing metal wheels. See the “Training” part under for extra data.
Starting in January 2002, a 4-Tire system was launched, eliminating the spare tire sensor. This system was provided on all WJ’s that got here with a metal spare wheel. Models with the manufacturing unit chrome wheels/chrome spare get the 5-tire system. Upon particular request, the 4-tire system modules might be programmed by the vendor to activate the fifth spare tire bit. A fifth valve stem module must be bought and put in into the spare.
In addition to the frequencies proven within the image, if a tire loses greater than 1.5 psi of stress the signa
TIRE PRESSURE MONITOR SYSTEM THRESHOLDS / WARNING CHIMES
The Electronic Vehicle Information Center (EVIC) within the overhead console displays the wi-fi tire stress indicators from the tire sensors and determines if any tire has gone under the low stress threshold or raised above the excessive stress threshold, as proven within the desk under. A warning is just sounded when a specific tire, any tire, goes above or under the thresholds. These thresholds are preset by the manufacturing unit and are usually not changeable.
| Low tire stress thresholds | High tire stress thresholds | ||
| System standing indicator | Tire Pressure | System standing indicator | Tire Pressure |
| On | 25 PSI | On | 45 PSI |
| Off | 28 PSI | Off | 40 PSI |
| On the “Low” facet, the warning will chime when a tire drops right down to 25 PSI, and the show will learn “Low Pressure”. | On the “High” facet, the warning will chime when a tire stress exceeds 45 PSI, and the show will learn “High Pressure”. | ||
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ADDING THE TPMS TO WJ GRAND CHEROKEES
Note: It seems that among the wheels used on 1999-2001 Grand Cherokees might not be appropriate with the tire stress valve/transmitter stems, attributable to a bigger ridge which doesn’t permit the stem to seat correctly. This has to this point been confirmed for the Timberline wheel used on 1999-2001 Laredo fashions. A 2001 Laredo proprietor used an angle grinder on his Timbeline wheels to take away a 1/8″ X 1-1/2″ space of steel, which was on the outer fringe of the ridge away from the bead/seat space. This allowed for the sensor to mount flush towards the wheel and align completely with the valve stem gap.
So far we’ve got confirmed that the 1999-up Silverblade #1, Silverblade #2, the 2001-up Rogue Chrome wheels and the 2001 Limited Silverblade 3 wheels are appropriate with the sensors, with no alterations required. In addition, any wheel used on 2002-up fashions can be appropriate. See our Factory wheels and tires web page for data on the totally different wheels used on 1999-2004 Grand Cherokee’s.
The Tire Pressure Monitor System might be simply added to 2002-2004 mannequin 12 months WJ automobiles, though it may be quite costly if the required components are bought new from a vendor. The EVIC module contained in the console should be changed with the superior model that features the TPMS circuitry. There is not any additional wiring required, the prevailing module is just eliminated and changed with the brand new one. Most EVIC modules are interchangeable. If you have got the usual EVIC for instance, you’ll be able to improve and set up both of the 2 step-up fashions. One provides HomeLink, and the opposite provides HomeLink plus the TPMS. The previous module might be offered if desired to barely offset among the improve prices.
Tire Pressure Monitor System components |
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| EVIC module (Note: doesn’t embrace lens)(All modules will work on all 1999-2004 Grand Cherokees. Some 1999-2001 wheels could require a modification for the sensor to suit, see feedback above) |
Qty: 1 | P/N: 56042756AF (2002 fashions)P/N: 56042756AG* (2002/2003 fashions – beginning Jan. 2002)P/N: 56042756AI** (2003 fashions)P/N: 56042756AJ** (2003/2004 fashions – beginning Feb. 2003) |
MSRP: $ 645.00 ea. |
| EVIC lens (Note: not wanted if current lens is re-used) |
Qty: 1 | P/N: 5012882AA | MSRP: $ 20.75 ea. |
| Magnet, coaching | Qty: 1 | P/N: 52109664AA (Similar to Miller Special Tool 8821) |
MSRP: $ 19.90 ea. |
| Sensor / Transmitter (Note: sensors can’t be used on spare tires with metal wheels) |
Qty: 5 | P/N: 52088990AC | MSRP: $ 67.50 ea. |
| Valve stem nuts | Qty: 5 | P/N: 52088961AA | MSRP: $ 5.80 ea. |
| Valve stem caps | Qty: 5 | P/N: 5083124AA | MSRP: $ 3.85 ea. |
| Valve core, aluminum (Note: Included with Sensor / Transmitter) |
Qty: 5 | P/N: 4897346AA | MSRP: $ 2.30 ea. |
| Quantities famous in purple textual content are what’s required when upgrading from a primary module to the TPMS module.* Starting with 2003 mannequin 12 months manufacturing, the “Instant MPG” characteristic was deleted on all modules.
** “AG” sequence (January 2002) and newer modules are programmed with both the 4-tire system or the 5-tire system. The 4-tire system modules might be programmed by the vendor to activate the fifth spare tire bit. Most Limited and Overland fashions that had the TPMS choice got here with the 5-tire model whereas Laredo fashions (metal spare tire) got here with the 4-tire system. |
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See EVIC modules for a whole record of Grand Cherokee EVIC module half numbers.
INSTALLING AN UPGRADED EVIC MODULE
1. Disconnect the unfavorable cable on the battery.
2. Remove phillips screw. The screw is situated close to the windshield facet, and ought to be eliminated with a non-magnetic screwdriver (to keep away from interference with the compass).
3. Grab the console from the edges, wedging your fingers beneath it. Carefully and firmly pry it straight down. Slightly rocking it forwards and backwards whereas pulling downward makes it simpler. The EVIC module meeting might be eliminated with out unhooking the courtesy mild or sunroof wiring. It is hooked up with 4 phillips screws and has one wiring harness.
4. To fully take away the overhead console, disconnect the EVIC harness, courtesy mild harness, and the sunroof change connector.
5. Remove the EVIC module. Remove the 4 phillips screws attaching the module to the overhead console meeting. There is one small wire harness to unplug, situated close to the again of the module. The module meeting can now be faraway from the console.
6. Install the upgraded module. The new module will match precisely instead of the previous one. If the brand new module doesn’t include the plastic lens, the lens out of your previous module will have to be used. The lens simply snaps on and off the EVIC. Attach the wiring harness and screw the brand new module in place with the 4 phillips screws.
7. Reinstall the overhead console. Firmly press the overhead console again into the headliner bracket and fasten the phillips screw.
8. Reconnect the unfavorable battery cable.
Note: The Compass Zone data for the EVIC could need to be re-entered, this may be achieved by way of the menu.
9. Have the sensor/valve stems put in onto the edges. When putting in the tire stress sensor/transmitter, examine the sealing O-ring on the backside of the valve stem for any signal of harm or deterioration. Replace O-ring if essential, earlier than putting in the stress transmitter on the wheel. Also, ensure the floor of the wheel that the O-ring seals towards is clear and never broken.
9a. Tighten the tire stress sensor/transmitter mounting nut to a torque of seven N·m (64 in. lbs.) When tightening the sensor/transmitter nut, maintain the transmitter so it doesn’t rotate. If the sensor/ transmitter rotates so the highest edge shouldn’t be degree with the wheel, injury to the transmitter will happen when mounting the tire. If the highest fringe of the transmitter shouldn’t be degree with the wheel, it may be rotated into place by frivolously tapping it along with your hand.
CAUTION: When mounting the higher bead of the prolonged mobility tire, the correct process should be used. Not utilizing the correct process will end in injury to the wheel and tire.
9b.Mount the higher bead of the tire on the wheel.
9c. Install the unique or an OEM alternative valve stem cap on the valve stem.
9d. Using a cleaning soap resolution, test that no air leak is current the place the valve stem mounts to the wheel.
9e. Balance the tire/wheel meeting utilizing the right process for utilizing wheel flange mount and stick-on wheel weights.
9f. Install the tire/wheel on the automobile.
9g. The system should then be retrained with the particular magnet in order that the EVIC learns the particular location of every transmitter.
Tire stress sensor/valve removing
NOTE 1: The cap used on this valve stem accommodates an O-ring seal to forestall contamination and moisture from coming into the valve stem. Retain this valve stem cap for re-use. Do not substitute an everyday valve stem cap as a replacement.
NOTE 2: The valve stem used on this automobile is made from aluminum and the core is nickel plated brass. The unique valve stem core should be reinstalled and never substituted for a valve stem core made from a distinct materials. This is required to forestall corrosion within the valve stem attributable to the totally different metals.
CAUTION: The stress transmitter should be faraway from the wheel and dropped into the tire previous to breaking the bead and dismounting the tire. Failure to do that will tremendously improve the danger of damaging the stress transducer when servicing the tire.
Tire sealants
CAUTION: THE USE OF TIRE SEALANTS IS STRICTLY PROHIBITED FOR VEHICLES EQUIPPED WITH THE TIRE PRESSURE MONITORING SYSTEM. TIRE SEALANT CAN CLOG TIRE PRESSURE SENSORS.
10. Training / Retraining the tire sensors:
The sensor transmitters can simply be retrained by anybody and takes simply a few minutes to finish. The particular magnet device used for retraining is included with these automobiles during which the manufacturing unit has put in the TPMS choice. The magnet may also be bought for round $25, in any other case a pair of 6″ or so audio system with good measurement magnets will do the trick.
1. On the overhead console, use the “Menu” button to advance to the “Retrain” choice within the EVIC menu.
2. When “Yes” is chosen, coaching will start, beginning with the left entrance tire.
(LF, RF, RR, LR, Spare). You’ll have 60 seconds to position the magnet on the primary tire stem and 30 seconds for every of the opposite 4, the spare being final. As every tire location is “discovered”, there’s a confirming horn chirp. It could take 5-10 seconds for the confirming chirp as soon as the magnet is positioned on every stem. That’s it, the right tire stress will now be displayed for the corresponding tires and the TPMS is absolutely purposeful.
Note that for aftermarket metal wheels the coaching magnet can’t be used and {that a} 125kHz transponder is critical to retrain the EVIC to the sensors. This course of might be achieved by the vendor with a DRB-III device. The ID’s of every sensor should be written down and assigned a location (LF, RF, RR, LR, SP). They are then rewritten to inform the EVIC which place every sensor is in.
TIRE PRESSURE SYSTEM TEST
The following take a look at can be utilized to confirm two features. One, that the tire stress sensors are transmitting correctly and two, the EVIC module is receiving these transmissions accordingly. Using the STEP button on the overhead console, scroll to the clean show, then press the RESET button for 5 seconds, a beep will sound indicating the beginning of this take a look at. The automobile icon and transmission counters will now be displayed, (similar show as particular person tire stress besides counters exchange tire stress values).
Upon coming into the take a look at mode, the EVIC will clear the sensor counter and every time a sensor sign for a street tire is obtained, the EVIC will replace the counter worth. The automobile should be pushed to 20-25 mph to initially activate the transmitters, and as soon as activated they’ll keep activated for quarter-hour after the automobile stops shifting. The counter values ought to all increment considerably evenly. If any of the street tires point out a a lot totally different worth than one other tire sensor, this can be a signal of an issue. Replace the suitable tire sensor and retest the system. This take a look at will proceed till any of the overhead console buttons are pressed or the ignition is turned off.
EVIC module take a look at mode
Self take a look at mode:
1. Ignition off
2. Press and maintain each the C/T and Reset buttons
3. Turn ignition to “On”
4. Release buttons after you see the software program revision seem on the show
5. Following completion of those assessments, the EVIC will show one of many following messages:
- Pass Self Test
Momentarily depress and the Reset button to return to the compass/pc show mode. The EVIC is working correctly. - Failed Self Test
The EVIC module has a failure. The EVIC module is defective and should changed. - Not Receiving J1850 Message
The EVIC shouldn’t be receiving correct message enter from the PCI information bus. This may end up from yet another defective digital modules within the automobile, or a defective PCI information bus. The use of a DRB scan and the correct Diagnostic Procedures handbook required for additional prognosis.
DRBIII take a look at mode:
1. Select “Body”, “VIC”, “Sys take a look at” after which “Self take a look at”.
TIRE PRESSURE SYSTEM TROUBLESHOOTING & DISPLAY MESSAGES
The Sensor/Transmitters are usually not internally serviceable. If a single Sensor/Transmitter fails and can’t be detected by the EVIC, it should be changed. Replacement can also be required when a “Battery Low” message is displayed. Estimated battery life is 7-10 years.
There are 4 circumstances which can trigger a Tire Pressure Monitoring System fault to be set. All fault codes are related to a selected wheel location.
1. If the EVIC detects a non-transmitting Sensor/ Transmitter in a street wheel for ten consecutive minutes with automobile velocity above 25 MPH:
A. An energetic fault code can be saved
B. A Chime is requested
C. “TIRE SENSOR BAD / MISSING” or “SERVICE TIRE PRESSURE SYSTEM” can be displayed
D. A dashed line on the wheel location on the graphic show can be seen if the show is activated.
2. A low stress sensor battery standing
3. All 5 sensors are transmitting at a shorter than anticipated interval
4. No legitimate stress sensor ID from the spare tire for 20 consecutive ignition cycles spaced a minimum of one hour aside:
A. An energetic fault code can be saved
B. A Chime is requested
C. “TIRE SENSOR BAD / MISSING” or “SERVICE TIRE PRESSURE SYSTEM” can be displayed.
Use the DRBIII® Input/Output perform to additional isolate the particular concern. The DRBIII® might be queried to find out the Sensor/Transmitter standing:
“Invalid Pressure” – The Sensor/Transmitter is reporting a unfavorable stress or a stress above 63 psi.
“Low Batt” – The Sensor/Transmitter has reported a low battery standing for seven consecutive ignition cycles.
“Trained” – The Sensor/Transmitter ID code is acknowledged by the EVIC.
“Active” – The automobile is shifting at 25mph and/or the Sensor/Transmitter is “awake” and transmitting as anticipated by the EVIC.
SPARE WHEEL AUTO-LOCATE (5-TIRE TPM SYSTEM ONLY)
If the spare tire is mounted on the automobile, the EVIC will detect the transfer and decide from the sensor transmit intervals, which wheels are mounted and which one is now the spare. The spare tire sensor/transmitter transmits as soon as per hour. The sensor/transmitters within the mounted wheels transmit as soon as per minute when the automobile is shifting at 25 mph.
“REMOVE MAGNET FROM SPARE” (5-TIRE TPM SYSTEM ONLY)
A magnet is used to provoke a sensor ID transmission. In the EVIC coaching process, the spare wheel is the final within the sequence. If the magnet is left on the wheel, the sensor/transmitter will proceed its ID transmission. If the EVIC detects 20 transmissions from the spare wheel in 60 seconds and the automobile velocity is above 40 km/h (25 mph), it’s going to:
A. Request a chime
B. Display “REMOVE MAGNET FROM SPARE” for 60 seconds per ignition-ON cycle
“TIRE PRESSURE UNAVAILABLE”
The EVIC can detect excessive radio noise interference. When the noise degree is simply too excessive to differentiate a transmission from a sensor/transmitter, it’s going to:
A. Display “TIRE PRESSURE UNAVAILABLE” for five seconds
B. Request a chime
C. Switch again to the earlier display screen
“TIRE PRESSURE NOW AVAILABLE”
If the “TIRE PRESSURE UNAVAILABLE” message was displayed due to radio noise interference, the EVIC will:
A. Display “TIRE PRESSURE NOW AVAILABLE” for five seconds
B. Request a chime when the noise degree now not interferes with sensor/transmitter transmissions
Further technical, diagnostic and security data might be discovered within the Factory Service Manual.
PERSISTANT LOW TIRE PRESSURE WARNINGS
After the automobile has set for 3 hours, test the tire pressures with an correct stress gauge and modify pressures to the door placard stress specfication and confirm utilizing correct stress gauge.
DO NOT USE THE EVIC DISPLAYED TIRE PRESSURE VALUES AS THESE MAY NOT REPRESENT THE UPDATED PRESSURE VALUE (Note: The EVIC is not going to replace instantly. In order for the EVIC to replace with the brand new tire pressures it’s essential to do certainly one of two issues: (1) Wait quarter-hour for the EVIC to replace. This is as a result of the TPMS sensors solely measure the stress within the tires throughout stationary mode each quarter-hour. Stationary mode is reached quarter-hour after the automobile is parked. (2) Take a fast drive (should go over 20MPH for a minimum of 5 seconds) to immediate the sensors to measure the pressures and subsequently replace the EVIC with the brand new pressures. During drive mode, the TPMS sensors test the stress each 30 seconds).
If the warning nonetheless persists, calibrate TPMS sensors (be aware that after coaching is accomplished, the coaching magnet should be faraway from the valve stem or the TPMS sensor battery will turn out to be discharged). If the warning nonetheless persists the sensor(s) could have to be changed.
New SmarTire / Cycloid AutoPump system
A tire pump inside every wheel cap!
| A brand new superior tire stress monitor system from SmarTire has been examined on some prototype Jeeps. This system or one related could seem on future fashions. In conjunction with an automated tire AutoPump made by Cycloid, this mixed system routinely and continously re-inflates tire stress to a specified degree, making certain optimum inflation of tires underneath totally different conditions and temperatures.The inertia compressor is only one″ thick by 3″ in diameter and weights a mere 8 ounces. Its anticipated design life is 130,000 miles, with ten years of battery energy. The system has been proven at some previous auto exhibits within the U.S., put in within the Grand Cherokee Concierge prototype idea automobile. |
