Question about 2000 Jeep Cherokee

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Jeep will not start. When I turn the key on after about 30 seconds "no bus" comes up on the odometer. Replaced the ECM with new one from parts store. After replacing, the jeep started and we drove it for about 15 min. Parked over night and next morning it would not start and "no bus" shows up again. I guess something is causing the ecm to go bad. What could this be?

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6 Suggested Answers

6ya6ya
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SOURCE:

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Posted on Jan 02, 2017

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SOURCE: no BUS on odometer

I used to have the NoBUS show up on the odometer also, but always while driving. The immediate fix was a sharp rap on the top of the cluster with my fist. To fix it permanently, I removed the cluster,cleaned the contacts both cluster and harness with spray contact cleaner, then applied some dielectric grease to prevent any further corrosion.

HTH

Posted on Jul 01, 2008

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  • 73 Answers

SOURCE: Jeep Cherokee ECM

thers only one problem with replacing a computer on a newer model vehicle and that is when you get a computer sometimes you have to "flash" the computer to put in your vin numkber and other things. If you don't your vehicle won't start or it will start and immediately die. The only place I know of that can flash computers in the dealer. A computer for your vehicle is about $900 from the dealer and then you have to pay to have it flashed. Hope this helps.

Posted on Sep 12, 2008

crayzeetrayn
  • 837 Answers

SOURCE: 2001 Jeep Grand Cherokee code P1391

I would check to be sure that the timing chain hasn't jumped at all ..

Posted on Mar 25, 2009

ZJLimited
  • 17970 Answers

SOURCE: i need a wiring diagram for 93 jeep grand cherokee

Review the Jeep ZJ Secc-8W-Wiring-Diagrams

Hope helped with this. Good luck (remember rated this help).

Posted on Nov 09, 2009

  • 6982 Answers

SOURCE: 1991 Jeep Cherokee Limited starts, runs a few minutes then dies

Running for five minutes sounds like something other than a security system problem (usually shuts off much earlier) but if that has been compromised it needs to be put back together or the trigger wire from the drivers door lock needs to be grounded.
I'd look to the throttle position sensor, map sensor, crank position sensor or the ballast resistor on the drivers fender. You need to do tests on those items as all influence the fuel management system after warm up. Test when it is cold and after it shuts off so you don't mistake a part malfunction only when hot. Hands on testing is the ONLY way to determine accurately exactly what is happening there. Anything else is an educated guess!!!

Posted on Mar 11, 2010

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1 Answer

Will not start


Hey Sidney. On G6 it has a pass lock anti theft- in which your key is programmed into the computer. If the key is not programmed into the computer or ECM, then nothing at all, heres the steps, and where it says a new cut key on 1, ignore that, just use your key, and also you will need to take your g6 into the dealership and have them reflash the ECM, and program the VIN number into your new ECM, if not it might throw the check engine light.

1. Insert a new cut key in ignition and turn key to the ON position for
10 minutes and 30 seconds.

2. Within 45 seconds turn the key to OFF and then back to the ON position for
10 minutes and 30 seconds. 3. Within 45 seconds turn the key to OFF and then back to the ON position for
10 minutes and 30 seconds.

4. Turn key OFF then back ON. The key is now programmed.
Start vehicle to test key.

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Check fuses first, but could be needs new CPU

Jun 14, 2012 | 2000 Jeep Wrangler

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My 2001 cherokee will not start. the engine will turn over. the voltage is good but it reads nothing on the gauge, neither will the fuel. after a few seconds the odometer will read "no bus"


Hi, the no BUS is usually a seriuos issue with engine controller communication. Can you check and see what trouble code is stored in the PCM (engine comuter)? This code needs to be retrieved with a code reader available at most auto stores for around $40. If you can give me the code, I can tell you exactly what is wrong and what will be needed to repair your Jeep.

Sep 15, 2011 | 2001 Jeep Cherokee

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STARTS BUT SHUTS OFF IN SECONDS? LOST THE IGNITION KEY AND BROKE THE STEERING LOCK TO START THE ENGINE. 1999 CHEVY BLAZER.


When the ignition switch is turned on, the immobilizer control module sends a challenge signal through the antenna around the ignition switch to the transponder chip in the ignition key. The transponder key responds with an encrypted key code. The immobilizer module then decodes the key code and compares it to the list of registered keys. When the engine is started, the ECM sends a request to the immobilizer module over the data bus to verify the key is correct. If an attempt is made to start the vehicle with an invalid ignition key, the immobilizer module sends a message over the data bus to the instrument cluster to flash the anti-theft indicator lamp. If the ECM does not receive a "valid key" message from the immobilizer module within 2 seconds of engine start up, the ECM will disable the fuel injectors to kill the engine. You'll need to get a new key and get it registered in the immobilizer control module. You'll need a scan tool, the VIN number, the date manufactured and a factory-assigned PIN number.

Nov 18, 2010 | 1999 Chevrolet Blazer

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Hi can u help me plz my 1994 jeep grand cherokee laredo 4.0L Automatic have problem with it before I start my jeep, i have to let it sit with the key in the "on" position for 5-10 min may be more...


Your ecm is going bad. If you haven't noticed yet, the vehicle will only start once the check engine light comes on, on the dash. That's the ecm finally sending power to the relays that feed the fuel pump and ignition systems. If you're mechanically and electrically handy you can remove the ecm, disassemble it and replace the three power capacitors inside. If not, just have the ecm checked and replaced.

Nov 02, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

2001 jeep cherokee '' no bus '' when wet


"no bus" means the communication line (wire) between the modules is down. It could be shorted to ground or power externally or a module itself is pulling it down. The engine, transmission, antilock brake, airbag, instrument cluster, and overhead console modules all use the same bus line to relay information to each other. One way to isolate the faulty module is to disconnect each module one by one with the key on until the "no bus" goes away and the odometer comes back to normal. This isn't an easy fault to find since the PCI bus line runs everywhere but I would start with isolating modules. I hope this helps.

Oct 17, 2009 | 2001 Jeep Cherokee

2 Answers

No Bus Error


All the modules are connected together to communicate with each other via the PCI bus. It is possible that one of the modules is pulling the bus down.Since the vehicle won't start it could be any one of the modules. It will be a process of elimination to find the faulty one by disconnecting them one at a time. Here are a few, powertrain control module (the one you replaced) Instrument cluster, overhead console, anti-lock brakes, airbag. Since the cluster unplugged wont read anymore, just try to start the vehicle to see if that was the one. Otherwise see if the odometer message of "no bus" goes away after each one is unplugged.

Apr 23, 2009 | 1999 Dodge Durango

2 Answers

Wont start my odometer blinks and says no bus


From the official Durango shop manual......(abbreviated)

Self Diagnosis Test

Vehicle key position is OFF ,or able to pull key out.
Hold in the trip odometer button (dont release yet)
Turn key to the ON position (one notch), but DON'T try to start the engine
Continue holding the trip button for about 10-12 seconds until CHEC appears in the odometer display
Release the trip button.
Series of three digit numeric failure codes may appear.
If no failure message appears, the self diagnostic test will proceed as described in step 6


Code Chart

110- cluster CPU,RAM,EEPROm failure, replace cluster

900-CCD data bus not operational, check CCD data bus connections at cluster, check the cluster fuses,check the CCD data bus bias, cehck the CCD data bus voltage, check the CCD data bus terminations.

920-cluster is not recieving a vehicle speed message from the PCM, check PCM software level and reflash if required, use the ($2500+) DRBIII scan tool to verify the vehicle speed message is being sent by the PCM

921-the cluster is not recieveing a distance pulse message from PCM,check PCM software level and reflash if required, use the ($2500+) DRBIII scan tool to verify the distance pulse message is being sent by the PCM

940-the cluster is not recieving an airbag lamp-on message from the ACM, check the CCD data bus connections at the ACM, check the ACM fuse.

950-cluster not recieving an ABS lamp-on message from the CAB, check CCD data bus connections at the ACM, check the ACM fuse.

960- clsuter not recieving a PRND21 message from the TCM, check the CCD data bus connections at the TCM, check the TCM fuse.

999-An error has been discovered, record the failure message, depress the trip odometer reset button to continue the Self-Diagnostic Test

Step 6
Instrument cluster will test each segment of the odometer (all first, then each one seperately)

Step 7
Bulb test

Step 8
Gauge test

Step 9
test completed

The instrument cluster will return to normal operation at the completion of test, if ignition switch turned off, or a vehicle speed message indicating movement recieved from the PCM on the CCD data bus.

Hope that help you or anyone else in future.

Aug 10, 2008 | 2000 Dodge Durango

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