DD15 Troubleshooting – Section 32.1 SPN 168/FMI 0

Section 32.1
SPN 168/FMI 0

This diagnosis is typically battery voltage high.‪

Check as follows:‪

  1. Measure battery voltage with the engine running at maximum rpm.
  2. If greater than 16 volts, check for proper alternator operation and repair or replace, as required. Refer to "32.1.1 Verify Repairs" .

Section 32.1.1
Verify Repairs

Verify repairs as follows:‪

  1. Turn ignition OFF.
  2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
  3. Clear codes with DDDL 7.0 or latest version.


    To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

  4. Start and bring engine up to operating temperature (over 140°F/60°C).
  5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.

EPA07 DD15 Troubleshooting Guide - DDC-SVC-MAN-0029
Generated on 10-13-2008

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