Page 555 - Foton Workshop Manual - Auman EST-M

Engine section – Engine (Cummins ISF3.8) EG - 39

IN
DTC code DTC definition DTC check condition Failed part

• Urea temperature sensor DI
• Urea temperature sensor circuit short to the
Urea tank temperature sensor ground
1678 Ignition switch at ON EG
short to power supply or open • Sensor connector in poor contact or wire

harness failure
TR
• Engine ECM

Urea tank temperature not • Urea temperature sensor
1679 Ignition switch at ON AX
reasonable • Combination instrument display fault

• Nitrogen oxide sensor
SCR injection cell internal
1681 Ignition switch at ON • Air control solenoid valve FR
failure
• Engine ECM
ST
• Nitrogen oxide sensor
1682 SCR injection cell external fault Ignition switch at ON • Air control solenoid valve
• Engine ECM BR
• Urea heater
Urea tank heater short to power • Sensor connector in poor contact or wire BW
1683 Ignition switch at ON
supply or open harness failure
• Engine ECM
EL
• Urea heater
Urea tank heater short to • Sensor connector in poor contact or wire
1684 Ignition switch at ON
ground harness failure

• Engine ECM

NOx concentration • Nitrogen oxide sensor
1694 Ignition switch at ON
unreasonably low • Engine ECM

The voltage of engine ECM5
• Engine ECM5 sensor power supply circuit
sensor power supply is higher Ignition switch at ON and
1695 and power supply short
than the normal value or short the engine is running
• Engine ECM
to the low voltage power supply
The voltage of engine ECM5 • Engine ECM5 sensor power supply circuit is
sensor power supply is lower Ignition switch at ON and short to the ground
1696
than the normal value or short the engine is running • Sensor connector in poor contact
to the low voltage power supply • Engine ECM

• Air solenoid valve
Injection unit air solenoid valve
1697 Ignition switch at ON • Solenoid valve circuit is short to the ground
short to ground
• Engine ECM

• Air solenoid valve
Injection unit solenoid valve
1698 Ignition switch at ON • Solenoid valve is short to the power supply
short to power supply or open
• Engine ECM

EG-039