Operation Section
Table 2. Diagnostic Fault Codes (Flash Codes) cont'd.
DFC
PROBABLE FAULT
HbridgeFault_ETC
Electronic Throttle Control
Driver has failed.
Indeterminate fault on
491
Hbridge driver for
(29)
electronic throttle control.
Possibly either ETC+ or
ETC- driver signals have
been shorted to ground
521
LowOilPressureFault
(52)
Low engine oil pressure
531
SysVoltRangeLow
(53)
System voltage too low
541
SysVoltRangeHigh
(54)
System voltage too high
(*) Fault actions shown are default values specified by the OEM.
FAULT ACTION *
(1) TurnOnMil
(2) CutThrottle
(1) TurnOnMil
(2) DelayedEngine
Shutdown
TurnOnMil
(1) TurnOnMil
(2) DelayedEngine
Shutdown
-124-
CORRECTIVE ACTION FIRST CHECK
Check ETC driver wiring for a shorted circuit
SECM Pin A17 to ETC + Pin 1
SECM Pin A18 to ETC - Pin 4
•
Perform the throttle test using the Service
Tool and re-check for fault
Check the ETC internal motor drive by
disconnecting the throttle connector and
measuring the motor drive resistance at the
throttle
TPS Pin 1 (+DRIVER) to
Pin 4 (-DRIVER) ~3.0-4.0
Check engine oil level
Check electrical connection to the oil
pressure switch
SECM Pin B9 to Oil Pressure Switch
Check battery voltage
•
Perform maintenance check on electrical
connections to the battery and chassis
ground
•
Check battery voltage during starting and
with the engine running to verify charging
system and alternator function
•
Measure battery power at SECM with a
multimeter (with key on)
SECM Pin A23 (DRVP) to
SECM Pin A16 (DRVG)
SECM Pin A23 (DRVP) to
SECM Pin B17 (DRVG)
Check battery and charging system voltage
•
Check battery voltage during starting and
with the engine running
•
Check voltage regulator, alternator, and
charging system
•
Check battery and wiring for overheating
and damage
•
Measure battery power at SECM with a
multimeter (with key on)
SECM Pin A23 (DRVP) to
SECM Pin A16 (DRVG)
SECM Pin A23 (DRVP) to
SECM Pin B17 (DRVG)