Daewoo CIELO EURO III Manual page 308

1F – 139 ENGINE CONTROLS
THROTTLE POSITION (TP) SENSOR HIGH VOLTAGE
Circuit Description
The engine control module (ECM) supplies a 5 volt
reference signal and a
ground to the Throttle Position (TP) sensor. The TP sen-
sor sends a voltage signal back to the ECM rela-
tive to the throttle plate opening. The voltage signal will
vary from approximately 0.45 volts at closed throttle, to
over 4.5 volts at Wide Open Throttle (WOT).
Conditions for Setting the DTC
TP sensor voltage is greater than 4.86 volts.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will illuminate.
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.
A history DTC is stored.
The ECM will substitute a default value for TP.
The scan tool may not show the defaulted value.
Conditions for Clearing the MIL/DTC
The MIL will turn off after three (four –
1.5L SOHC) consecutive ignition cycles in which the
diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm up
cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
DIAGNOSTIC TROUBLE CODE (DTC) P0123
Diagnostic Aids
If a DTC P0123 cannot be duplicated, the information in-
cluded in the Freeze Frame data can be useful. Use the
scan tool DTC information data to determine the status
of the DTC. If the DTC occurs intermittently, using the
DTC P0121 diagnostic table may help isolate the prob-
lem.
With the ignition ON and the throttle at closed position,
the voltage should read between 0.20 v and 0.90 v and
increase steadily to over 4.5 v at WOT.
DTCs P0123 and P0113 stored at the same time could
be the result of an open sensor ground circuit.
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. With the throttle closed, the TP sensor voltage
should read less than 0.90 v. If the TP sensor volt-
age does not read less than 0.90 v, check for a bind-
ing or sticking throttle cable.
4. With the TP sensor disconnected, the TP sensor
voltage should be less than 0.2 v if the ECM
and wiring are OK.
5. Probing the ground circuit with a test light checks the
circuit for high resistance which will cause a DTC
P0123 to set.
TAA1F170
DAEWOO T-154 BL2,3