Operation Section
-108-
Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC
Probable Fault
Action
Corrective Action, First Check
42 EST1Low
Coil driver signal low or
under-current
Stored Fault Code
(MIL Only)
Check coil driver wiring and
connector for shorts
43
EST1High
Coil driver signal high or
over-current
Stored Fault Code
(MIL Only)
Check coil driver wiring for an open
circuit or disconnected connector
51 InjectorFault
Stored Fault Code
(MIL, Disable
Adaptive learns)
Check Gasoline Injector (INJ) for an
open wire or injector connector being
disconnected
52 LowOilPressure
Low Engine Oil Pressure
Delayed Engine
Shutdown
Check engine oil level
Check electrical connection to the oil
pressure switch
53 BatterySensorInputLow
Battery voltage measured below
+8.0 VDC
Stored Fault Code
(MIL Only)
Check battery voltage
z
Perform maintenance check
on electrical connections to
the battery and chassis
ground
z
Check battery voltage during
starting and with the engine
running to verify charging
system and alternator
function
Measure battery power at the SECM
with a multimeter
54 BatterySensorInputHigh
Battery voltage measured above
+15.9 VDC
Stored Fault Code
(MIL Only)
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 the SECM
with a multimeter
55 XDRPSensorInputLow
+5VDC Transducer power
supplied by the SECM to the
sensors is below +4.60VDC
(Expected faults when Transducer
power is lost
CODES: 22, 24, 33, 62, 64, 66, 68 &
69)
Engine Shutdown
Measure transducer power at the
TMAP connector with a multimeter
Verify transducer power at the SECM
with a multimeter
Verify transducer power at ETC with
a multimeter
Verify transducer power to the foot
pedal with a multimeter
