Page 85 - Foton Workshop Manual - Auman EST-M

Diagnosis - Diagnosis-fault diagnosis of electronic and electrical parts DI - 31

DTC code DTC definition DTC check condition Failed part IN
● Urea temperature sensor
● Urea temperature sensor
DI
Urea tank temperature sensor circuit short to ground
1677 The ignition switch is “ON”
short to ground ● Sensor connector in poor
contact or harness failure EG
● Engine ECM

● Urea temperature sensor
TR
● Urea temperature sensor
Urea tank temperature sensor circuit short to ground
1678 Ignition switch at ON
short to power supply or open ● Sensor connector in poor AX
contact or harness failure

● Engine ECM
FR
● Urea temperature sensor
Urea tank temperature not
1679 Ignition switch at ON ● Display fault of
reasonable
combination instrument ST
● Nitrogen oxide sensor

SCR injection cell internal ● Air controlled solenoid
1681 Ignition switch at ON BR
failure valve
● Engine ECM
● Nitrogen oxide sensor BW
External fault of SCR ● Air controlled solenoid
1682 Ignition switch at ON
injection unit valve
EL
● Engine ECM
● Urea heater
Urea tank heater short to ● Sensor connector in poor
1683 Ignition switch at ON
power supply or open contact or harness failure

● Engine ECM

● Urea heater
Urea tank heater short to ● Sensor connector in poor
1684 Ignition switch at ON
ground contact or harness failure

● Engine ECM

NO x concentration ● Nitrogen oxide sensor
1694 Ignition switch at ON
unreasonably low ● Engine ECM
The voltage of engine ECM5
● Power circuit of engine
sensor power supply is higher
Ignition switch at ON and the ECM #5 sensor short to
1695 than the normal value or
engine is running power source
short to the low voltage
● Engine ECM
power supply
● Power circuit of engine
The voltage of engine ECM5
ECM #5 sensor short to
sensor power supply is lower
Ignition switch at ON and the ground
1696 than the normal value or
engine is running ● Sensor connector in poor
short to the low voltage
contact
power supply
● Engine ECM

DI-031