1999 Jeep Wrangler "no Bus"

Tiny
FIVESTRINGSAM
  • MEMBER
  • 1999 JEEP WRANGLER
  • 4 CYL
  • 4WD
  • MANUAL
  • 130,000 MILES
Odometer shows "no bus", gauges don't work, starter turns over but won't start. I've googled this and checked the most commonly suggested things. The instrument cluster makes a good connection, not the problem. All fuses are good. Replaced the Crank sensor and still the same. The connections at the computer are good. I'm taking the crank sensor back and I don't have the money to throw at it. Anyone have any other suggestions it would be greatly appreciated.
Do you
have the same problem?
Yes
No
Monday, April 19th, 2010 AT 5:52 PM

5 Replies

Tiny
MERLIN2021
  • EXPERT
Have seen two strange ones, one needed a shift solenoid, unplugged the electrical to trans, started right up, the other had no gauges, windows no start, turned out to be the Driver's door module. Try the trans first, seems a short in the sols can cause no bus problem between the computers. No codes on that one either!
Was this
answer
helpful?
Yes
No
+1
Wednesday, April 21st, 2010 AT 3:00 PM
Tiny
FIVESTRINGSAM
  • MEMBER
I'm not sure what I'm looking for or where to look on unplugging the wires to the transmission. I found 2 plugs on the side of the transmission above the mount, hard to get to. I just didn't want to break something unplugging the wrong thing. What am I looking for?
Was this
answer
helpful?
Yes
No
Wednesday, April 21st, 2010 AT 6:46 PM
Tiny
MERLIN2021
  • EXPERT
Under the center of the dash find the transmission control module, unplug it, see if it will start.
Was this
answer
helpful?
Yes
No
Thursday, April 22nd, 2010 AT 2:54 PM
Tiny
FIVESTRINGSAM
  • MEMBER
Ok, I found a box under the dash in the middle on the hump and unplugged the wires going to it. Still the same thing. No gauges, it turns over but no start, then the odometer reads "no bus".
Was this
answer
helpful?
Yes
No
Thursday, April 22nd, 2010 AT 7:00 PM
Tiny
MERLIN2021
  • EXPERT
Using ohmmeter, check continuity between ground and terminals No. 4 and 5 on DLC. Continuity should exist. Repair as needed. Using voltmeter, measure voltage between ground and terminal No. 16 on DLC. Battery voltage should exist. If battery voltage is not present, inspect fuse No. 17 in Power Distribution Center (PDC). Replace as needed. If battery voltage is present, replace scan tool cable or scan tool as necessary. 1.Disconnect scan tool. Using an external voltmeter, measure voltage between ground and DLC terminal No. 3 (Violet/Brown wire). If voltage is not 2.3-2.6 volts, go to step 3) . If voltage is 2.3-2.6 volts, go to next step. 2.Measure voltage between ground and DLC terminal No. 11 (White/Black wire). If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or scan tool. 3.Disconnect instrument cluster connectors. Connect jumper wire between ground and terminal No. 3 (White/Black wire) on DLC connector. Using external ohmmeter, measure resistance between ground and terminal No. 2 (Violet/Brown wire) on right instrument cluster connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Violet/Brown wire. 4.Remove and inspect fuse No. 10. If fuse is open, go to next step. If fuse is okay, go to step 6) . 5.Turn ignition off. Remove fuse block fuse No. 10. Using ohmmeter, measure resistance between ground and fused ignition switch output terminal (Dark Blue/White wire) on fuse block fuse No. 10. If resistance is 5 ohms or greater, replace fuse. If resistance is less than 5 ohms, repair Dark Blue/White wire for short to ground. Replace fuse No. 9. 6.Remove instrument cluster. Turn ignition on. Using external voltmeter, measure voltage between ground and terminal No. 8 (Dark Blue/White wire) on left instrument cluster harness connector. If voltage is 10 volts or less, repair open Dark Blue/White wire. If voltage is greater than 10 volts, go to next step. 7.Using external ohmmeter, measure resistance between ground and terminal No. 6 (Black/Light Green wire) on left instrument cluster connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open Black/Light Green wire. 8.Connect jumper wire between ground and terminal No. 11 (White/Black wire) on DLC connector. Using external ohmmeter, measure resistance between ground and terminal No. 1 (White/Black wire) on right instrument cluster connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open White/Black wire. 9.Disconnect jumper wire. Measure resistance between ground and terminal No. 1 (White/Black wire) on right instrument cluster connector. If resistance is less than 1000 ohms, repair White/Black wire for short to ground. If resistance is 1000 ohms or greater, go to next step. 10.Disconnect jumper wire. Measure resistance between ground and terminal No. 2 (Violet/Brown wire) on right instrument cluster connector. If resistance is less than 1000 ohms, repair Violet/Brown wire for short to ground. If resistance is 1000 ohms or greater, replace instrument cluster.


http://www.2carpros.com/forum/automotive_pictures/62217_n_2.jpg

Was this
answer
helpful?
Yes
No
Friday, April 23rd, 2010 AT 3:07 PM

Please login or register to post a reply.

Recommended Guides