Intermittent Low Voltage - Daewoo CIELO EURO III Manual

1F – 137 ENGINE CONTROLS
THROTTLE POSITION (TP) SENSOR INTERMITTENT LOW VOLTAGE
Circuit Description
The Throttle Position (TP) sensor circuit provides a volt-
age signal that changes relative to throttle blade angle.
The TP sensor sends a voltage signal back to the
engine control module
(ECM) relative to the throttle plate opening. The voltage
signal will vary from approximately 1 volt at closed
throttle, to over 4.9 v at Wide Open Throttle (WOT). The
TP signal is used by the ECM for fuel control and
for most of the ECM controlled outputs. The TP
signal is one of the most important inputs used by the
ECM for fuel control and most of the ECM
controlled outputs. If the ECM detects a TP signal
that is intermittently below the range of the TP sensor, a
DTC P1122 will be set.
Conditions for Setting the DTC
TP sensor indicates a TP signal intermittently less
than 0.14 volt.
Action Taken When the DTC Sets
The Malfunction Indicator Lamp (MIL) will not illumi-
nate.
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.
A history DTC is stored.
Conditions for Clearing the MIL/DTC
The history DTC will clear after 40 consecutive warm
up cycles in which the diagnostic runs without a fault.
DIAGNOSTIC TROUBLE CODE (DTC) P1122
DTC P1122 can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:
Poor connection at the ECM. Inspect harness
connectors for backed-out terminals, improper mat-
ing, broken locks, improperly formed or damaged ter-
minals, and poor terminal-to-wire connection.
Damaged harness. Inspect the wiring harness for
damage. If the harness appears OK, observe the
throttle position display on the scan tool while moving
connectors and wiring harnesses related to the TP
sensor. A change in the display will indicate the loca-
tion of the fault.
Reviewing the Fail Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
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.
TAA1F170
DAEWOO T-154 BL2,3