MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
486
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Appendix
Appendix I Engine Malfunction Code
Part / System
Malfunction
Code
Malfunction Description
Exhaust-related
Malfunction
Indicator Lamp
Engine
Malfunction
Indicator
Lamp
Action
Air System Management
Air flow
sensor
P0102
Malfunction of the air flow sensor
(low)
Lit up in the
third driving
circle
Lit up
Slightly
reduce the
torque (by
about
10%)
P0103
Malfunction of the air flow sensor
(high)
P1100
Malfunction of the air flow sensor
(malfunction of the supply voltage
or the analog-to-digital converter)
P1102
Malfunction related to the
reasonableness of the air flow
sensor (low)
Lit up in the
third driving
circle
Not lit up
P1103
Malfunction related to the
reasonableness of the air flow
sensor (high)
Exhaust gas
recirculation
(EGR) valve
P0400
Excessive control error of EGR
valve air flow
Lit up in the
third driving
circle
Not lit up
Slightly
reduce the
torque (by
about
10%)
P1404
Malfunction of EGR valve position
control (the absolute value of the
drive duty circle exceeding the limit
for too many times)
Lit up in the
third driving
circle
Not lit up
P1490
Drive malfunction of the EGR valve
(short circuit between forward drive
and reverse drive)
Lit up in the
third driving
circle
Lit up
P0487
Drive malfunction of the EGR valve
(broken circuit)
P0489
Drive malfunction of the EGR valve
(short circuit to ground)
P0490
Drive malfunction of the EGR valve
(short circuit to the supply)
P2103
Drive malfunction of the intake
throttle valve (short circuit to the
supply)
Not lit up
Not lit up
P2100
Drive malfunction of the intake
throttle valve (broken circuit)
P2102
Drive malfunction of the intake
throttle valve (short circuit to
ground)
