Daewoo Bus BS Series Owner's Manual page 245

Fault
LAMP
Code
The EGR valve has failed the automatic calibration procedure
1896 Amber
at initial key-on
The EGR differential pressure sensor has detected low EGR
gas flow or the EGR differential pressure reading is not valid
1899 Amber
for engine operating conditions
The soot load of the aftertreatment diesel particulate filter has
1921 Amber
exceeded the recommended limits
The soot load of the aftertreatment diesel particulate filter has
1922 Red
exceeded the recommended limits
High signal voltage detected at the aftertreatment differential
1923 Amber
fuel shutoff valve circuit
Low signal voltage detected at the aftertreatment differential
1924 Amber
fuel shutoff valve circuit
The ECM has detected that the aftertreatment fuel pressure
1926 Amber
signal is not changing with engine operating conditions
High signal voltage detected at the aftertreatment fuel
1927 Amber
pressure sensor circuit
Low signal voltage detected at the aftertreatment fuel
1928 Amber
pressure sensor circuit
An error has been detected in rither the aftertreatment fuel
1932 Amber
injector or the aftertreatment fuel shutoff valve system
1933 Amber High battery voltage detected by the EGR valve
Low battery voltage detected by the EGR valve
1934 Amber
Intermittent communication between the smart EGR valve
1935 Amber
controller and the ECM has been detected
Low battery voltage detected by the VGT actuator
1938 Amber
REASON
7-55
EFFECT
EGR valve actuation will be disabled.
EGR valve actuation will be disabled.
The aftertreatment dash lamp will flash.
Engine protection derate.
Severe engine derate.
Active aftertreatment diesel particulate filter
regeneration will be disabled.
Active aftertreatment diesel particulate filter
regeneration will be disabled.
None on performance.
None on performance.
None on performance.
Active aftertreatment diesel particulate filter
regeneration will be disabled.
EGR valve actuation will be disabled.
Low voltage information fault code only.
The EGR valve will hold the position of the last
valid J1939 message.
None on performance.
FAULTY DIAGNOSIS