Idm Pwr (Injection Driver Module Power) - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

IDM PWR (Injection Driver Module Power)

Figure 472 Function diagram for the IDM PWR supply
The function diagram for the IDM PWR includes the
following:
• IDM
• IDM main power relay
• Ignition switch or power relay
• Battery
• Fuses
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Function
The Injector Drive Module (IDM) requires a 12 V power
source. The operating power is received from the
vehicle batteries through the IDM main power relay
contacts each time the ignition switch is turned ON.
When the ignition is turned ON, the IDM provides an
internal ground to the coil side of the IDM main power
relay. This closes the relay contacts and provides the
IDM with necessary power.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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