MBE 4000 DDEC VI Troubleshooting – Section 32.1 SPN 158/FMI 0

Section 32.1
SPN 158/FMI 0

The diagnostic condition is typically high system voltage.‪

Section 32.1.1
Battery High Voltage Check

Check for high voltage as follows:‪

1. Start the engine and rev at rated speed.
2. Measure the voltage across the battery terminals. .
   1. If the voltage is greater than 16 V, troubleshoot the charging system for an overvoltage condition. Refer to the OEM Vehicle Manual.
   2. If the voltage is between 16 and 11.0 V and fault code 158/0 is still active, replace the MCM. Refer to "32.1.1.1 Verify Repairs" .

Section 32.1.1.1
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.
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.