Service manual

G420F(FE) Service Manual Chapter 9. Advanced Diagnostics 299
Table 2. Diagnostic Fault Codes (Flash Codes) cont’d.
DFC PROBABLE FAULT FAULT ACTION *
CORRECTIVE ACTION
FIRST CHECK
551
(55)
SensVoltRangeLow
Sensor reference voltage
XDRP too low
(1) TurnOnMil
(2) EngineShutdown
Measure transducer power at the
TMAP connector with a multimeter
TMAP Pin 3 XDRP +5 Vdc to TMAP
Pin 1 XDRG GND
Verify transducer power at the SECM
with a multimeter
SECM Pin B24 +5 Vdc to SECM Pin
B1 XDRG GND Verify transducer
power at ETC with a multimeter
ETC Pin 3 XDRP PWR to ETC Pin 2
XDRG GND Verify transducer power to
the foot pedal with a multimeter.
561
(56)
SensVoltRangeHigh
Sensor reference voltage
XDRP too high
(1) TurnOnMil
(2) EngineShutdown
Measure transducer power at the
TMAP connector with a multimeter
TMAP Pin 3 XDRP +5 Vdc to TMAP
Pin 1 XDRG GND
Verify transducer power at the SECM
with a multimeter
SECM Pin B24 +5 Vdc to SECM Pin
B1 XDRG GND Verify transducer
power at ETC with a multimeter
ETC Pin 3 XDRP PWR to ETC Pin 2
XDRG GND
Verify transducer power to the foot
pedal with a multimeter.
571
(57)
HardOverspeed
Engine speed has exceeded
the third level (3 of 3) of
overspeed protection
(1) TurnOnMil
(2) HardRevLimit
Usually associated with additional ETC
faults
Check for ETC Sticking or other ETC
faults Verify if the lift truck was motored
down a steep grade
572
MediumOverspeed
Engine speed has exceeded
the second level (2 of 3) of
overspeed protection
(1) TurnOnMil
(2) MediumRevLimit
Usually associated with additional ETC
faults
Check for ETC Sticking or other ETC
faults Verify if the lift truck was motored
down a steep grade
573
SoftOverspeed
Engine speed has exceeded
the first level (1 of 3) of
overspeed protection
(1) TurnOnMil
(2) SoftRevLimit
Usually associated with additional ETC
faults
Check for ETC Sticking or other ETC
faults Verify if the lift truck was motored
down a steep grade
611
(61)
APP1RangeLow
APP1 sensor voltage out of
range low, normally set if the
APP1 signal has shorted to
ground, circuit has opened or
sensor has failed
(1) TurnOnMil
(2) CheckEngineLight
Check foot pedal connector
Check APP1 signal at SECM PIN B7
(*) Fault actions shown are default values specified by the OEM.