Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com
Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com Diagnostic Trouble Code (DTC) Charts - TheDieselStop.com
6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids334 — ICP Unable To DTC 334 indicates an • Low oil level in DTC 344 can be set due toReach Set Point (Poor injection control system crankcase. a plugged EBP sensor or aPerformance) response time fault and • Contaminated engine oil. restriction in the tubemay be set during normal • Debris in engine oil. leading to the sensor. Toengine operation through • Aerated engine oil. check for this condition,the continuous monitor • Trapped air in the ICP remove the sensor andfunction or during the system (particularly after tube and inspect for carbonEngine Running Standard an injector or high deposits.Test. DTC 334 compares pressure pumpmeasured ICP to desired replacement)ICP and looks for a large • Intermittent IPR valvepressure difference of 9 wiring connection.MPa (1300 psi) for a period Spread IPR harnessof 3 seconds. When DTC terminals at valve, poorly334 is active, the PCM crimped terminals, orignores the ICP sensor and pulled-back pins.controls the IPR valve • Defective or stuckoperation frominjection pressureprogrammed defaultvalues.regulator.• Leaks in ICP system.• Problem with ICP sensoror sensor circuit,incorrect sensor, systembiased high or low.• Defective high pressurehydraulic pump.335 — ICP Unable To DTC 335 is set after the • Low oil level in Engine cranking timeBuild Pressure During PCM detects 8 to 10 crankcase varies with engineCranking seconds of engine cranking • No lube oil pressure or temperature. Verify ICPwith less than 5 MPa (725 lube oil delivery (reservoir sensor and IPR wiring ispsi) of ICP. Engine empty or not filling) connected. Check for oilcranking speed must be • Trapped air in the ICP leaks. Verify if system hasgreater than 130 rpm system (particularly after been recently serviced (airbefore diagnostic trouble an injector or high entrapment). If ICP systemcode detection can begin. pressure pump was serviced, vehiclereplacement) should be operated 20• Leaks in ICP system miles to validate system• Defective or stuck performance.injection pressureregulator• Loose high pressurehydraulic pump gear• Defective high pressurehydraulic pump341 — Exhaust Back When the EBP signal • DTC 341 can be set due DTC 341 is set by thePressure Signal Out Of voltage is detected out of to an open or short to PCM when the EBP signalRange Low range low, the PCM will ground on the signal is less than 0.039 volts forcause the engine to ignore circuit, a defective sensor more than 0.5 seconds.the EBP signal. The EGR or an open VREF circuitvalve will close and the or VREF short to ground.(Continued)PCM will rely on the VGTpre-programmed values.• When DTC 341 is activethe amber ENGINEindicator is illuminated.2004 F650/F750 6.0L Diesel
6.0L Diesel Diagnostic Trouble Code (DTC) DescriptionsDTC Description Possible Causes Diagnostic Aids342 — Exhaust Back When the EBP signal • DTC 342 can be set due DTC 342 is set by thePressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EBP signalRange High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts forcause the engine to ignore source on the EBP signal more than 0.5 seconds.the EBP signal. The EGR circuit, or a defectivevalve will close and the sensor.PCM will rely on the VGTpre-programmed values.• When DTC 342 is activethe amber ENGINEindicator is illuminated.343 — Excessive Exhaust DTC 343 is set by the • EBP sensor bias high Make sure all sensor,Back Pressure (Gauge) PCM when the exhaust • EBP signal ground open injector and actuatorbackpressure is greater • Exhaust restriction electrical DTCs have beenthan 260 kPa (37.7 psi). (muffler or catalytic repaired.converter)• VGT valve or vanesstuck closed• VGT Control Circuit shortto B344 — Exhaust Back DTC 344 is set by the • EBP sensor bias high Make sure all sensor,Pressure Above PCM when the EBP is • EBP sensor or tube line injector and actuatorSpecification When greater than 300 kPa (43.5 plugged electrical DTCs have beenEngine Off psi) when engine is off or repaired.being cranked.345 — Faults Detected DTC 345 is set by the • Oil pressure and quality Make sure all sensor,During VGT Portion Of PCM during the AMS test • High intake restriction injector and actuatorThe AMS Test when the PCM measures • Intake/CAC system leak electrical DTCs have beenthe EBP and does not see (pipes, loose clamps, repaired.the expected response inpressures.hoses)• Exhaust system leak• MAP sensor bias• EBP sensor bias• EGR stuck open• VGT valve or vanessticking• EBP sensor or tubeplugged• Power cylinder integrity• VGT control circuit346 - Faults Detected DTC 346 is set by the • EGR valve stuck or Make sure all sensor,During EGR Portion Of PCM during AMS test sticking injector and actuatorAMS Test when the PCM measures • EGR valve position electrical DTCs have beenEBP and EGRP and does sensor bias repaired.not see the expected • EBP sensor biasresponse in pressuresversus position.• EBP sensor or tubeplugged• EGR control circuit351 - Change In Exhaust DTC 351 is set by the • EBP tube or sensor Make sure all sensor,Back Pressure Did Not PCM when less than 14.5 plugged injector and actuatorOccur When Expected kPa (2.1 psi) is detected • EBP sensor bias electrical DTCs have beenbetween key ON and 2500 • EGR valve stuck open repaired.rpm.• Exhaust system leak(Continued)2004 F650/F750 6.0L Diesel
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6.0L Diesel <strong>Diagnostic</strong> <strong>Trouble</strong> <strong>Code</strong> (<strong>DTC</strong>) Descriptions<strong>DTC</strong> Description Possible Causes <strong>Diagnostic</strong> Aids342 — Exhaust Back When the EBP signal • <strong>DTC</strong> 342 can be set due <strong>DTC</strong> 342 is set by thePressure Signal Out Of voltage is detected out of to an open signal ground PCM when the EBP signalRange High range high, the PCM will circuit, short to a voltage is greater than 4.9 volts forcause the engine to ignore source on the EBP signal more than 0.5 seconds.the EBP signal. The EGR circuit, or a defectivevalve will close and the sensor.PCM will rely on the VGTpre-programmed values.• When <strong>DTC</strong> 342 is activethe amber ENGINEindicator is illuminated.343 — Excessive Exhaust <strong>DTC</strong> 343 is set by the • EBP sensor bias high Make sure all sensor,Back Pressure (Gauge) PCM when the exhaust • EBP signal ground open injector and actuatorbackpressure is greater • Exhaust restriction electrical <strong>DTC</strong>s have beenthan 260 kPa (37.7 psi). (muffler or catalytic repaired.converter)• VGT valve or vanesstuck closed• VGT Control Circuit shortto B344 — Exhaust Back <strong>DTC</strong> 344 is set by the • EBP sensor bias high Make sure all sensor,Pressure Above PCM when the EBP is • EBP sensor or tube line injector and actuatorSpecification When greater than 300 kPa (43.5 plugged electrical <strong>DTC</strong>s have beenEngine Off psi) when engine is off or repaired.being cranked.345 — Faults Detected <strong>DTC</strong> 345 is set by the • Oil pressure and quality Make sure all sensor,During VGT Portion Of PCM during the AMS test • High intake restriction injector and actuatorThe AMS Test when the PCM measures • Intake/CAC system leak electrical <strong>DTC</strong>s have beenthe EBP and does not see (pipes, loose clamps, repaired.the expected response inpressures.hoses)• Exhaust system leak• MAP sensor bias• EBP sensor bias• EGR stuck open• VGT valve or vanessticking• EBP sensor or tubeplugged• Power cylinder integrity• VGT control circuit346 - Faults Detected <strong>DTC</strong> 346 is set by the • EGR valve stuck or Make sure all sensor,During EGR Portion Of PCM during AMS test sticking injector and actuatorAMS Test when the PCM measures • EGR valve position electrical <strong>DTC</strong>s have beenEBP and EGRP and does sensor bias repaired.not see the expected • EBP sensor biasresponse in pressuresversus position.• EBP sensor or tubeplugged• EGR control circuit351 - Change In Exhaust <strong>DTC</strong> 351 is set by the • EBP tube or sensor Make sure all sensor,Back Pressure Did Not PCM when less than 14.5 plugged injector and actuatorOccur When Expected kPa (2.1 psi) is detected • EBP sensor bias electrical <strong>DTC</strong>s have beenbetween key ON and 2500 • EGR valve stuck open repaired.rpm.• Exhaust system leak(Continued)2004 F650/F750 6.0L Diesel
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