7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 481
DTC 533
IDM relay voltage high
• DTC 533 is set by the ECM when the voltage from
the IDM power rela y exceeds 1 6 V.
• DTC533canbesetduetoanalternatorvoltage
output of 16 V or more. DTC 533 can also be
setwhenjumpstartingtheengineorincorrect
external battery connections exist.
• DTC 533 will not illuminate the amber ENGINE
lamp.
DTC 534
IDM relay voltage low
• DTC 534 is set by the ECM when the voltage from
the IDM main power relay is less than 7 V.
• DTC 534 can be set due to a poor connectio ns
between relay and batteries, poor connections
between relay and IDM, a blown fuse, or a failed
IDM main power relay, discharged batteries or
increased resistance in the battery feed circuits.
• DTC 534 will not illuminate the amber ENGINE
lamp.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Box
• Relay Breakout Harness
• 12–pin Breakout Harness
• Terminal Te st Adapter Kit
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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