Daewoo CIELO EURO III Manual page 302

1F – 133 ENGINE CONTROLS
THROTTLE POSITION (TP) SENSOR LOW 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 is less than 0.14 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 using the scan tool.
DIAGNOSTIC TROUBLE CODE (DTC) P0122
Diagnostic Aids
If a DTC P0122 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.
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 TP sensor has an auto zeroing feature. If the
voltage reading is between 0.2 to 0.9 volts, the
ECM will assume the TP sensor is at a closed
throttle position (0%).
4. Simulates a high voltage signal which will identify an
open in the signal circuit.
5. If additional DTCs are set, check the 5 volt reference
circuits for a short to ground.
6. If the test light illuminates while probing the TP signal
circuit, then the TP signal circuit is shorted to
ground.
8. The replacement ECM must be programmed.
Refer to the latest Techline procedure for ECM
reprogramming.
TAA1F170
DAEWOO T-154 BL2,3