Dtc P0133 Oxygen Sensor (O2S 1) Slow Response - Daewoo CIELO EURO III Manual

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 Aids
DTC P0133 or slow response is most likely caused by
one of the following items:
Fuel pressure – The system will go rich if fuel pres-
sure is too high. The ECM can compensate for
some increase, but if it gets too high, a DTC
P0133 may set. Refer to "Fuel System Diagnosis" in
this section.
Leaking injector – A leaking or malfunctioning injector
can cause the system to go rich.
Manifold Absolute Pressure (MAP) sensor – An out-
put that causes the ECM to sense a higher than
normal manifold pressure (low vacuum) can cause
the system to go rich. Disconnecting the MAP sensor
will allow the ECM to set a fixed value for the
MAP sensor. Substitute a different MAP sensor if the
rich condition is gone while the sensor is discon-
nected.
Pressure regulator – Check for a leaking fuel pres-
sure regulator diaphragm by checking for the pres-
ence of liquid fuel in the vacuum line to the pressure
regulator.
Throttle Position (TP) sensor – An intermittent TP
sensor output can cause the system to go rich due to
a false indication of the engine accelerating.
Step
Perform an On-Board Diagnostic (EOBD) System
Check.
1
Is the system check complete?
1. Turn the ignition ON, with the engine OFF.
2. Install a scan tool.
2
Are any additional Diagnostic Trouble Codes (DTCs)
set?
1. Start the engine and idle at normal operating
temperature.
2. Operate the vehicle within the specified
parameters under Conditions for Setting the DTC.
3
3. Using the scan tool monitor the specific DTC
information for DTC P0133 until DTC P0133 test
runs.
Does the scan tool indicate DTC P0133 failed this
ignition cycle?
Did the scan tool indicate that DTC P1133 or P1134
failed this ignition cycle?
4
DAEWOO T-154 BL2,3

DTC P0133 Oxygen Sensor (O2S 1) Slow Response

Action
ENGINE CONTROLS 1F – 156
O2S 1 contamination – Inspect O2S 1 for silicone
contamination from fuel or use of improper Room
Temperature Vulcanizing (RTV) sealant. The sensor
may have a white powdery coating, resulting in a high
but false voltage signal (rich exhaust indication). The
ECM will then reduce the amount of fuel deliv-
ered to the engine causing a severe surge or drive-
ability problem.
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.
14. The replacement ECM must be programmed.
Refer to the latest Techline procedure for ECM
reprogramming.
17. If no malfunctions have been found at this point and
no additional DTCs were set, refer to "Diagnostic
Aids" for additional checks and information.
Value(s)
–
Go to Step 2
–
applicable
DTC table
–
Go to Step 4
applicable
–
DTC table
Yes No
Go to
"On-Board
Diagnostic
System Check"
Go to
Go to Step 3
Go to
"Diagnostic
Aids"
Go to
Go to Step 5