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Home >> Jeep >> 1998 >> Cherokee Classic, 2.5 P >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Vehicle Communications) >> Identifying Vehicle Communication Problems >> Bus Short To 5 Volts

Bus Short To 5 Volts

WARNING: This page is about a different car, the 1999 Dodge Pickup and 1999 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Turn ignition off. Disconnect Powertrain Control Module (PCM). PCM is mounted in right side of firewall. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, go to step  10 . If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  2. Turn ignition off. Disconnect anti-lock brake controller module. Controller module is mounted to top of ABS hydraulic unit. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace anti-lock brake controller module. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  3. Turn ignition off. Disconnect instrument cluster. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace instrument cluster circuit board. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  4. Turn ignition off. Disconnect compass mini-trip computer. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace compass mini-trip computer. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  5. Turn ignition off. Disconnect CCD radio. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace radio. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  6. Turn ignition off and wait 2 minutes. Disconnect Air Bag Control Module (ACM). ACM is located under center of instrument panel. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace ACM. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  7. Turn ignition off. Disconnect Central Timer Module (CTM). CTM is mounted behind right corner of dash, beside glove box. Turn ignition on. If scan tool does not display BUS SHORT TO 5 VOLTS, replace CTM. If scan tool displays BUS SHORT TO 5 VOLTS, go to next step.
  8. Disconnect scan tool from DLC. Using external voltmeter, measure voltage between ground and DLC connector terminal No. 3 (Violet/Brown wire). If voltage is more than 4 volts, repair Violet/Brown wire for short to voltage. If voltage is 4 volts or less, go to next step.
  9. Measure voltage between ground and DLC connector terminal No. 11 (White/Black wire). If voltage is more than 4 volts, repair White/Black wire for short to voltage. If voltage is less than 4 volts, replace scan tool cable or scan tool as necessary.
  10. Turn ignition off. Using external ohmmeter, measure resistance between Powertrain Control Module (PCM) connector C3 terminal No. 30 (Violet/Brown wire) and connector C1 terminal No. 17 (Violet/Black wire). PCM is located at right inner fender. If resistance is less than 800 ohms, repair short between Violet/Brown wire and Violet/Black wire. If resistance is 800 ohms or more, go to next step.
  11. Measure resistance between PCM connector C3 terminal No. 28 (White/Black wire) and PCM connector C1 terminal No. 17 (Violet/Black wire). If resistance is less than 800 ohms, repair short between Violet/Black and White/Black wires of both connectors. See wiring diagram for clarification. If resistance is 800 ohms or more, replace PCM.
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