7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 303
DTC 135
IVS circuit fault
• If the APS is changing but IVS is constant, the
ECM assumes the IVS is the conflict source and
sets DTC 135. In this case the ECM limits the APS
signal to a lower value that provides less than full
rpm, but does not limit engine rpm to idle.
• When DTC 135 is active the amber ENGINE lamp
is illuminate d.
DTC 133, 134, and 135 are caused by intermittent
conditions. These DTCs remain active until the
vehicle has been shutdown and restarted. They do
not recover without cycling the ignition switch. Later
calibration versions may allow DTC recovery without
cycling the ignition switch.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• 3-Banana Plug Harness
• 500 Ohm Resistor Harness
• Breakout Box
• APS/IVS Breakout Harness
• Terminal Te st Adapter Kit
The APS/IVS circuit requires the use of vehicle
circuit diagrams. See truck Chassis Electrical Circuit
Diagram Manual for circuit numbers, connector and
fuse locations.
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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