Daewoo CIELO EURO III Manual page 458

1F – 288 ENGINE CONTROLS
Circuit Description
The G sensor is a vertical low g-acceleration sensor. By
sensing vertical acceleration caused by bumps or pot-
holes in the road, the
engine control module (ECM) can determine if
the changes in crankshaft speed are due to engine mis-
fire or are driveline induced. If the G sensor detects a
rough road condition, the ECM misfire detection
diagnostic will be de-activated. The G sensor at rest out-
put should be between 2.35-2.65 volts (+1G). During a
rough road condition, the voltage output can vary be-
tween 0.5 (*1G) and 4.5 volts (+3G).
Conditions for Setting the DTC
1.5L SOHC
D G sensor output is greater than 98%.
D Engine runtime is greater than or equal to 10 sec-
onds.
Action Taken When DTC Sets
D The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
D The ECM will store conditions which were pres-
ent when the DTC set as Failure Records data only.
This information will not be stored as Freeze Frame
data.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D A history DTC will clear after 40 consecutive warm up
cycles without a fault.
D DTC(s) can be cleared by using the scan tool.
DIAGNOSTIC TROUBLE CODE (DTC) P1393
G SENSOR ROUGH ROAD HIGH VOLTAGE
Diagnostic Aids
Check for the following conditions:
D Poor connection at the ECM – Inspect the har-
ness connections for backed-out terminals, improper
mating, broken locks, improperly formed or damaged
terminals, and poor terminal-to-wire connection.
D Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe
the G sensor display on the scan tool while moving
connectors and wiring harnesses related to the sen-
sor. A change in the display will indicate the location
of the fault.
The G sensor will give correct voltages only if it is level
and mounted securely to its bracket.
Reviewing the Failure Records vehicle mileage since
the diagnostic test last failed may help determine how
often the condition that caused the DTC to be set oc-
curs. This may assist in diagnosing the condition.
Test Description
The number(s) below refer to step(s) on the diagnostic
table.
1. The On-Board Diagnostic (EOBD) System Check
prompts the technician to complete some basic
checks and store the freeze frame and failure re-
cords data on the scan tool if applicable. This
creates an electronic copy of the data taken when
the malfunction occurred. The information is then
stored on the scan tool for later reference.
10. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.
TAA1F350
DAEWOO T-154 BL2,3