ENGINE CONTROLS 1F–101
DAEWOO M-150 BL2
DTC P0140 – Heated Oxygen Sensor No Activity
Step Action Value(s) Yes No
1
Perform an Euro On-Board Diagnostic (EOBD)
System Check.
Is the system check complete?
–
Go to Step 2
Go to
“On-Board
Diagnostic
System Check”
2
1. Run the engine to above the specified operating
temperature.
2. Install a scan tool.
3. Operate the engine above the specified rpm for
2minuets.
Does the scan tool the indicate Closed Loop?
80°C(176°F)
1,200 rpm Go to Step 3 Go to Step 4
3
1. Turn the Turn the ignition switch to ON.
2. Review the Freeze Frame data and note the
parameters.
3. Operate the vehicle within the freeze frame
conditions and Conditions for Setting the DTC as
noted?
Does the scan tool the indicate Closed Loop?
–
Go to Step 12 Go to Step 4
4
Disconnect the Heated O2 sensor connector and
jumper the Heated O2 sensor low circuit, terminal 4
to ground.
Is the HO2 voltage below the specified value and
does the scan tool indicate the heated oxygen
sensor heater voltage within the specified value?
0.5V Go to Step 5 Go to Step 6
5
Check the Heated O2 sensor connector for
malfunction terminals or poor connection and repair
as necessary.
Is repair necessary?
–
Go to Step 12 Go to Step 9
6
1. Turn the ignition switch to On.
2. Remove the jumper wire.
3. Using a digital voltmeter(DVM), measure the
voltage between the Heated O2 sensor signal
circuit, terminal 3 to ground.
Does the Heated O2 sensor voltage measure above
the specified value? 0.6V Go to Step 10 Go to Step 9
7
Does the Heated O2 sensor voltage measure below
the specified value? 0.3V Go to Step 11 Go to Step 8
8
Check the Heated O2 sensor ground circuit, terminal
4 for an open or poor connection and repair as
necessary.
Is repair necessary?
–
Go to Step 12 Go to Step 8
11
Check the Heated O2 sensor signal circuit, terminal
3 for an open or poor connection and repair as
necessary.
Is repair necessary?
–
Go to Step 12 Go to Step 8
10
1. If disconnected, reconnect Heated O2 sensor
connector.
2. Using the scan tool, clear the DTCs.
3. Start the engine and idle at normal operating
temperature.
4. Operate the vehicle within the conditions for
setting this DTC as specified in the supporting
text.
Does the scan tool indicated that this diagnostic has
run and passed?
–
Go to Step 13 Go to Step 2
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