MBE 900 4000 Troubleshooting

Section 14.2 Troubleshooting PID 168

Section 14.2
Troubleshooting PID 168

The following procedures will troubleshoot PID 168.‪

Section 14.2.1
168 03 – Battery Voltage High Fault

Perform the following steps to troubleshoot a battery voltage high fault:‪

  1. Measure battery voltage with the engine running at maximum rpm.
    1. If greater than 14.5 volts, check for proper alternator operation and repair or replace, as required.
    2. Erase fault code memory.

Section 14.2.2
168 04 – Battery Voltage Low Fault

Perform the following steps to troubleshoot a battery voltage low fault:‪

  1. Check the condition of the alternator drive belt and replace, if required.
    1. If fault is no longer active, erase fault code memory.
    2. If fault is still active, go to step 2 .
  2. Check for loose alternator mounting and retighten or repair, as required.
    1. If fault is no longer active, erase fault code memory.
    2. If fault is still active, go to step 3 .
  3. Check for proper alternator operation and repair or replace, as required.
    1. If fault is no longer active, erase fault code memory.
    2. If fault is still active, go to step 4 .
  4. Check the condition of the battery (does it hold the charge?) and replace, if required.
    1. If fault is no longer active, erase fault code memory.
    2. If fault is still active, go to step 5 .
  5. Measure the resistance of the individual wires in the ground circuit.
    1. If resistance is greater than 0.5 Ω in any wire, repair or replace the wire and connector. Erase fault code memory.
    2. If resistance is less than 0.5 Ω in all wires, go to step 6 .
  6. Measure the resistance of the individual wires in the power circuit with the engine running and battery voltage greater than 12.5 V.
    1. If resistance is greater than 0.5 Ω in any wire, repair or replace the power circuit wires and connector. Erase fault code memory.
    2. If resistance is less than 0.5 Ω in any wire, go to step 7 .
  7. Measure the current drop of the individual wires in the ground circuit.
    1. If the current drop is more than 0.2 volts in any wire, repair or replace the ground circuit wires and connector. Erase fault code memory.
    2. If the current drop is less than 0.2 volts in any wire, go to step 8 .
  8. Measure the current drop of the individual wires in the power circuit.
    1. If the current drop is more than 0.2 volts in any wire, repair or replace the power circuit wires and connector. Erase fault code memory.


MBE 900/4000 Troubleshooting Guide - 6SE422
Generated on 10-13-2008

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