Volvo

This diagnostic function starts monitoring the DEF dosing pressure when the DEF pump is set to ?Running? mode. The aftertreatment control module (ACM) keeps track of the time when the pump is not in the ?Running? mode. When the time that the pump is not in “Running” mode accumulates to more than 25 % of a predetermined amount of time a DTC will set.

Conditions for diagnostic trouble code (DTC):
1) Dosing failure

Observable symptoms
1) Leakage, pressure side

Probable cause
1) Low fluid level in the tank
2) Leakage from hoses or connections
3) Aftertreatment Diesel Exhaust Fluid (DEF) Return Valve
4) Aftertreatment line connections swapped

Detailed information
1) If the DEF dosing pressure drops but can be built up again and dosing is interrupted for too long of period time this DTC is set

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) Abnormal system response, most likely high flow

Observable symptoms
1) Possible engine de-rate
2) Exhaust leakage

Probable cause
1) Connector
2) Wiring harness
3) Clogged ports
4) EGR Cooler
5) EGR system pipe and connections
6) EGR differential pressure sensor

Detailed information

Activation
1) The diagnostic trouble code (DTC) is first set after 30?min when driving with varying engine loads
2) At idle the diagnostic trouble code (DTC) is normally not set to active

Deactivation
1) The diagnostic trouble code (DTC) will be shown as inactive when the ignition key is turned to the 0 position
2) To fully verify the repair it may be necessary to activate vehicle functions or perform a test drive

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) Abnormal system response, most likely low flow

Observable symptoms
1) Possible engine de-rate
2) Exhaust leakage
3) Black smoke

Probable cause
1) Connector
2) Wiring harness
3) Clogged ports
4) EGR Cooler
5) EGR system pipe and connections
6) EGR differential pressure sensor

Detailed information

Activation
1) The diagnostic trouble code (DTC) is first set after 30?min when driving with varying engine loads
2) At idle the diagnostic trouble code (DTC) is normally not set to active

Deactivation
1) The diagnostic trouble code (DTC) will be shown as inactive when the ignition key is turned to the 0 position
2) To fully verify the repair it may be necessary to activate vehicle functions or perform a test drive

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EA:21 is above normal value

Observable symptoms
1) Uneven engine speed during idle

Probable cause
1) Connector
2) Wiring harness
3) EGR differential pressure sensor

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) The sensor signal is above normal range

Observable symptoms
1) Malfunction indicator lamp (MIL) illuminated

Probable cause
1) B166: EGR Differential Pressure Sensor

Detailed information

Activation
1) When the diagnostic trouble code (DTC) is active the engine control module (ECM) investigates during an extra driving cycle whether the malfunction indicator lamp (MIL) should be lit. If the DTC is active after the investigation the lamp lights up.

Deactivation
1) Erase diagnostic trouble code (DTC)

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EA:21 is below normal value

Observable symptoms
1) Uneven engine speed during idle

Probable cause
1) Connector
2) Wiring harness
3) EGR differential pressure sensor

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) Abnormal sensor signal

Observable symptoms
1) Possible engine de-rate
2) Exhaust leakage

Probable cause
1) Connector
2) Wiring harness
3) Clogged ports
4) EGR Cooler
5) EGR system pipe and connections
6) EGR differential pressure sensor

Detailed information

Activation
1) The diagnostic trouble code (DTC) is first set after 30?min when driving with varying engine loads
2) At idle the diagnostic trouble code (DTC) is normally not set to active

Deactivation
1) The diagnostic trouble code (DTC) will be shown as inactive when the ignition key is turned to the 0 position
2) To fully verify the repair it may be necessary to activate vehicle functions or perform a test drive

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) The voltage at pin A14.EA:21 is above normal value

Diagnostic operating conditions
1) Ignition key in ON position

Observable symptoms
1) Poor accelerator pedal (AP) response
2) Regeneration not possible

Probable cause
1) Connector
2) Wiring harness
3) EGR differential pressure sensor