DDEC TROUBLESHOOTING
[a] If the voltage measurement is less than or equal to 10.0 volts, refer to section 46.3.3.
[b] If the voltage measurement is greater than 10.0 volts, refer to section 46.3.5.
46.3.3
Voltage Check at ECM Via Volt-Ohm Meter
Perform the following steps to check voltage at the ECM.
1. Turn the vehicle ignition OFF.
2. Disconnect 5-way power harness connector at the ECM.
3. Measure voltage from socket A and C (red lead) of 5-way power harness connector and
a good battery ground (black lead). Don't use line (#151) as a ground reference. For
5-way ECM power harness connector, see Figure 46-1. For power harness schematic,
see Figure 46-2.
[a] If the voltage measurement is less than or equal to 11.5 volts, refer to section 46.3.4.
[b] If the voltage measurement is greater than 11.5 volts, refer to section 46.3.5.
Figure 46-1
5-Way ECM Power Connector
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
46-7
