Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com

6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids131 — APS Signal Out Of The PCM continuously • Possible causes include DTC 131 is set if the PCMRange Low monitors the APS/IVS a short to ground or an detects voltage less thancircuits for expected open in the APS signal 0.147 volts.voltages. It also compares circuit.the APS and IVS signals • DTC 131 can be set duefor conflict. If the PCM to a short to ground ordetects an APS signal out an open VREF or signalof range low, the engine circuits. If the conditionwill ignore the APS signaland operate at low idle.causing DTC 131 isintermittent and thecondition is no longerpresent, the code willbecome inactive andnormal engine operationwill resume.• When DTC 131 is activethe amber ENGINEindicator is illuminated.132 — APS Signal Out Of The PCM continuously • DTC 132 can be set due DTC 132 is set if the PCMRange High monitors the APS/IVS to a short to VREF or B+ detects a voltage greatercircuits for expected in the APS signal circuit. than 4.55 volts. The PCMvoltages. It also compares • When DTC 132 is active monitors voltage on VREFthe APS and IVS signals the amber ENGINE A and will adjust signalfor conflict. If the PCM indicator is illuminated. values for the sensors thatdetects an APS signal outuse VREF A for operation.of range high, the engineIf a sensor or circuit pullswill ignore the APS signaland operate at low idle.VREF less than 5 volts, thePCM may set out of rangehigh DTCs for the sensorsthat operate on VREF B(APS, BAP, B+, and VSS).133 — APS Signal In The PCM checks the • If the IVS signal is DTC 133 is caused byRange DTC voltage output of the APS changing and the APS intermittent conditions. Theby comparing the APS signal is constant, the DTC will remain active untilsignal with the IVS signal. PCM assumes the APS the vehicle has beenAPS and IVS signals can is the conflict source and shutdown and restarted.disagree in two cases: sets DTC 133. The The DTC does not recover• The APS signal indicates engine rpm is restricted without cycling the keythe pedal is pressed to idle. switch.down to accelerate, but • When DTC 133 is activethe IVS signal indicates the amber ENGINEidle position.indicator is illuminated.• The APS signal indicatesthe pedal has beenreleased to allow theengine to return to idle,but the IVS signalindicates off-idle positionof the pedal.If the PCM detects eitherof the above conditions,the PCM attempts toisolate the source ofconflict and set theappropriate DTC.(Continued)2004 F650/F750 6.0L Diesel