Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com

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6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids241 — Injection Control An open or short to ground • DTC 241 is set by the Output Circuit CheckPressure Regulator in the EGR control circuit PCM when the OCC test detected indicates high orOutput Circuit Check can be detected by an on has failed after the low resistance in circuit.(OCC) Self-test Failed demand output circuit KOEO Standard test hascheck during KOEObeen run.Standard tests. If there is a • DTC 241 can be setcircuit fault detected a DTC when a poor connectionwill be set. When the to the IPR solenoid orengine is running, the PCM defective IPR coil exists.can detect if the injection • When DTC 241 is set thecontrol pressure is equal to engine will not run andthe desired pressure. the amber ENGINEWhen the measuredindicator will not beinjection control pressure illuminated.does not compare to thedesired pressure, the PCMwill ignore the measuredICP signal and control theengine with the desiredvalue.246 — Engine Fan Output An open or short to ground • DTC 246 is set by the Before diagnosing, verifyCircuit Check (OCC) in the EFAN can be PCM only during the the PCM is programmedSelf-test Failed detected by the PCM KOEO Standard test. correctly. Verify the vehicleduring an on-demand During this test the PCM has an electronic fan.engine standard test. The performs an output circuitIAT and ECT aretest that momentarilymonitored continuously. If a enables the EFANDTC is detected in the IAT solenoid and measuresor ECT, the EFAN control the voltage drop acrossis disabled and the engine the relayfan is on all the time.251 — Glow Plug Control An open or short to ground • DTC 251 can be set for Glow plug and glow plugOutput Circuit Check in the glow plug relay an open or shorted GPC harness problems cannot(OCC) Self-test Failed circuit can be detected by signal circuit, an open be detected by the PCM.an on demand output feed circuit, or an opencircuit check performed glow plug relay coil.during the KOEO Standardtests. When a circuit faultis detected, a DTC will beset.256 — Radiator Shutter A fault in the Radiator • DTC 256 can be set RSE output circuit checkEnable Output Circuit Shutter Enable (RSE) when an open, short to a self-test failed.Check (OCC) Self-test circuit can be detected by voltage source or short toFailed an on demand output ground in the RSE circuit(Continued)circuit check during KOEOStandard test.exists.• DTC 256 can be set dueto a defective relay.2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids261 — Variable Geometry An open or short to ground • DTC 261 can be set DTC 261 can be set whenTurbo Output Circuit in the VGT control circuit when an open or short to a poor connection to theCheck (OCC) Self-test can be detected by an on ground in the VGT VGT solenoid exists.Failed demand output circuit control circuit or acheck during KOEOdefective VGT coil exists.Standard tests. If there is acircuit fault detected a DTCwill be set. When theengine is running, the PCMcan detect if the exhaustback pressure is equal tothe desired pressure.When the measuredexhaust back pressuredoes not compare to thedesired pressure, the PCMwill ignore the measuredEBP signal and will controlthe engine with the desiredvalue.264 — Exhaust Gas An open or short to ground • DTC 264 can be set due EGR output circuit checkRecirculation Output in the EGR control circuit to open or short to self-test failed.Circuit Check (OCC) can be detected by an on ground, short to aSelf-test Failed demand output circuit voltage source in thecheck during KOEOEGR control circuit, or astandard test. If there is a defective coil.circuit fault detected a DTCwill be set.267 — Engine Crank When the on demand • DTC 267 can be set due If the engine cranks whenInhibit Output Circuit engine on standard test is an open or short to the start switch is engaged,Check (OCC) Self-test performed, an open or ground on the coil side of check for failed ECI relayFailed short to ground can be the ECI relay. or problems with the PCMdetected on the coil side ofor PCM wiring harness.the ECI relay.311 — Engine Oil The EOT sensor provides • DTC 311 can be set due DTC 311 is set by theTemperature Signal Out a feedback signal to the to a sensor signal wire PCM when the EOT signalOf Range Low PCM indicating engine oil short to ground or a is less than 0.2 volts fortemperature. The PCM defective EOT sensor. more than 0.35 seconds.monitors the EOT signal to • When DTC 311 is activecontrol fuel quantity and the amber ENGINEtiming throughout the indicator is illuminated.operating range of theengine. During engineoperation, if the PCMrecognizes that the EOTsignal is lower or higherthan the expected value itwill set a DTC.(Continued)2004 F650/F750 6.0L Diesel
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Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com

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