Fault List Definitions - Daewoo G420E Service Manual

Fault List Definitions

Several sensors in the MI-04 system have input
low/high faults and a sensor range fault. These are
the coolant temperature sensor, the throttle position
sensor and the pedal position sensors. Signals to
these sensors are converted into digital counts by the
SECM. A low/high sensor fault is normal set when
the converted digital counts reach the minimum of 0
or the maximum of 1024 (1024=5.0 VDC with ~204
counts per volt). A sensor range fault is set if the
parameter measured by the sensor is outside the
normal operating range.
1024 Counts (Input High)
0 Counts (Input Low)
Figure F1
ECTSensorInputLow: (Engine Coolant Temperature
Sensor Input is Low) normally set if the coolant
sensor wire has shorted to chassis ground or the
sensor has failed.
ECTSensorInputHigh: (Engine Coolant Temperature
Sensor Input is High) normally set if the coolant
sensor wire has been disconnected or the circuit has
opened to the SECM.
ECTRangeHigh: (Engine Coolant Temperature
Range is High) the sensor has measured an
excessive coolant temperature typically due to the
engine overheating.
ThrottleSensorInputLo: (Throttle Position Sensor
(TPS1) Input is Low) is normally set if the TPS1
signal wire has been disconnected or the circuit has
opened to the SECM.
ThrottleSensorInputHi: (Throttle Position Sensor
(TPS1) Input is High) is normally set if the TPS1
signal wire has become shorted to power, the TPS1
has failed or the SECM has failed.
ThrottleSensorRangeLo: (Throttle Position Sensor
(TPS1) Range has measured Low) the TPS1
potentiometer has malfunctioned. An improper TPS
reading may be due to dirt or oxidation on the sensor
traces. NOTE: The TPS is not a serviceable item and
can only be repaired by replacing the DV-EV throttle
assembly.
Tier
G420E/G424E
Sensor Range
LP Engine
ThrottleSensorRangeHi: (Throttle Position Sensor
(TPS1) Range has measured High) the TPS1
potentiometer has malfunctioned. An improper TPS
reading may be due to dirt or oxidation on the sensor
traces. NOTE: The TPS is not a serviceable item and
can only be repaired by replacing the DV-EV throttle
assembly.
ETCSticking: (Electronic Throttle Control is Sticking)
is normally set if either of the ETC driver signals have
opened or become disconnected. This can also occur
if the throttle plate (butterfly valve) inside the throttle
bore is sticking. The plate sticking can be due to
some type of obstruction; a loose throttle plate or
worn components shaft bearings. Certified
technicians using the service tool software can
perform a throttle motion test to confirm sticking
problems. NOTE: The throttle assembly is not a
serviceable item and can only be repaired by
replacing the DV-EV throttle assembly.
PredictedTPSDifference: (Predicted Throttle
Position Sensor Difference) measured TPS1 is
different than SECM Calculated throttle position.
Normally caused by intake leaks between the throttle
assembly and the engine.
ETCSpringTestFailed: (Electronic Throttle Control
Spring Return Test has Failed) upon the initial startup
of the engine the SECM will perform a safety test of
the throttle return spring. If this spring has become
weak the throttle will fail the test and set the fault.
NOTE: The throttle assembly is not a serviceable
item and can only be repaired by replacing the DV-EV
throttle assembly.
ETCDriverFault: (Electronic Throttle Control Driver
has Failed) an over current condition has occurred on
either ETC+ or ETC- driver signals.
MapSensorInputLow: (Manifold Air Pressure Sensor
Input is Low) is normally set if the TMAP pressure
signal wire has been disconnected or the circuit has
opened to the SECM.
MapSensorInputHigh: (Manifold Air Pressure
Sensor Input is High) is normally set if the TMAP
pressure signal wire has become shorted to power,
shorted to the IAT signal, the TMAP has failed or the
SECM has failed.
IATSensorInputLow: (Intake Air Temperature Sensor
Input is Low) is normally set if the TMAP temperature
signal wire has become shorted to ground, shorted to
the MAP signal, the TMAP has failed or the SECM
has failed.
46 Advanced Diagnostics