Short To 5 Volts

Possible Causes:

1. Continuity Between Bus (+) Or (-) And 5-Volt Supply Circuits
2. Powertrain Control Module
3. Bus (+) Or Bus (-) Circuit Shorted To Voltage
4. Scan Tool Or Scan Tool Cable
5. Module/Component Shorted Internally
6. CCD Bus Circuit Shorted To A 5-Volt Circuit

Testing

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Turn ignition on. Using scan tool, select SYSTEM MONITORS, then CCD BUS TEST. If scan tool does not display BUS OPERATIONAL, go to step  4 . If scan tool displays BUS OPERATIONAL, go to next step.
2. Turn ignition off. Using a DVOM, measure resistance between PCM connector C3 terminal No. 30 (Violet/Brown wire) and all 5-volt supply circuits a PCM connectors. See PCM 5-VOLTS SUPPLY CIRCUIT IDENTIFICATION  table. See Figure . If resistance is less than 800 ohms in either measurement, repair Violet/Brown wire shorted to 5-volt supply circuit. If resistance is more than 800 ohms in both measurements, go to next step.
3. Using a DVOM, measure resistance between PCM connector C3 terminal No. 28 (White/Black wire) and all 5-volt supply circuits a PCM connectors. See PCM 5-VOLTS SUPPLY CIRCUIT IDENTIFICATION  table. If resistance is less than 800 ohms in either measurement, repair White/Black wire shorted to 5-volt supply circuit. If resistance is more than 800 ohms in both measurements, replace PCM.
NOTE: When performing this step, turn ignition off and wait 2 minutes before disconnecting each module. After each module is disconnected, turn ignition on.
4. Using scan tool, monitor display for BUS OPERATIONAL message as each of following modules are disconnected in order and one at a time.
   • Controller Anti-Lock Brake (CAB) Module
   • Electro-Mechanical Instrument Cluster (EMIC) Module
   • Central Timer Module (if equipped)
   • Air Bag Control Module (ACM)

   If scan tool displays BUS OPERATIONAL after disconnecting any module, replace module. If scan tool does not display BUS OPERATIONAL after disconnecting all modules, go to next step.

5. Turn ignition off. Wait 2 minutes. Disconnect PCM connectors. Disconnect CAB module connectors. Disconnect EMIC connectors. Disconnect central timer module connectors (if equipped). Disconnect ACM connectors. Using a DVOM, measure voltage between ground and DLC terminal No. 3 (Violet/Brown wire). See Figure . If voltage is more than 4 volts, repair short to voltage in Violet/Brown wire. If voltage is 4 volts or less, go to next step.
6. Using a DVOM, measure voltage between ground and DLC terminal No. 11 (White/Black wire). If voltage is more than 4 volts, repair short to voltage in White/Black wire. If voltage is 4 volts or less, repair or replace scan tool cable as necessary.