Daewoo CIELO EURO III Manual page 499

D Throttle Position (TP) sensor is between 25 and 60%.
D The rpm is between 1200 and 4000.
Deceleration Test
D Indicated vehicle speed is less than 3.1 mph (5 km/h).
D Manifold Air Pressure (MAP) is less than 30 kPa.
D TP sensor is less than or equal to 0.8 %.
D The rpm is between 1200 and 6000.
D The change in RPM is less than or equal to 50 RPM/
cycle.
Action Taken When the DTC Sets
D The Malfunction Indicator Lamp (MIL) will illuminate
after three (1.5L SOHC)
consecutive trip with a fail.
D The ECM will record operating conditions at the
time the diagnostic fails. This information will be
stored in the Freeze Frame and Failure Records buff-
ers.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D The MIL will turn off after three (four –
1.5L SOHC)consecutive ignition cycles in which the
diagnostic runs without a fault.
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.
DAEWOO T-154 BL2,3
ENGINE CONTROLS 1F – 329
Diagnostic Aids
An intermittent problem may be caused by a poor con-
nection, rubbed-through wire insulation, or a wire that is
broken inside the insulation.
VSS signal circuit should be thoroughly checked for the
following conditions:
D Backed-out terminals
D Improper mating
D Broken locks
D Improperly formed
D Damaged terminals
D Poor terminal-to-wire connection
D Physical damage to the wiring harness
Ensure the VSS is correctly torqued to the transmission
housing.
Refer to "Intermittents" in this section.
Test Description
Number(s) below refer to the step number(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.
2. The permanent magnet generator only produces a
signal if the drive wheels are turning greater than
3 mph (5 km/h). This step determines if DTC
P0502 is the result of a hard failure or an intermittent
condition.
3. Proper engine loads cannot be achieved in a shop
environment to properly run the vehicle within the
Freeze Frame Data conditions. It will be necessary
to drive the vehicle on the road to obtain the proper
engine loads.
4. This step verifies that the ECM is receiving a
signal from the VSS.
6. A resistance reading that is higher than the specified
value indicates that the VSS circuitry is open.
11. The replacement ECM must be repro-
grammed. Refer to the latest Techline procedure for
ECM reprogramming.