Daewoo Matiz (2003 year). Manual - part 48

1F – 102  ENGINE CONTROLS

DTC P0140 – Heated Oxygen Sensor No Activity (Cont’d)

Step

Action

Value(s)

Yes

No

11

1. Turn the ignition switch to LOCK.
2. Replace the Heated O2 sensor.
3. Road tests the vehicle.
4. Perform the diagnostic system check.
Is the replacement complete?

–

Go to Step 15

–

12

1. Turn the ignition switch to LOCK.
2. Replace the ECM.
3. Road tests the vehicle.
4. Perform the diagnostic system check.
Is the replacement complete?

–

Go to Step 15

–

13

Check if any additional DTCs are set.
Are any DTCs displaced that have not been
diagnosed?

–

Go to

applicable DTC

table

System OK

ENGINE CONTROLS  1F – 103

BLANK

1F – 104  ENGINE CONTROLS

MAA1F140

DIAGNOSTIC TROUBLE CODE (DTC) – P0141 HEATED OXYGEN SENSOR

HEATER MALFUNCTION

Circuit Description

The engine control module (ECM) supplies a voltage of
about 450mm volts between the ECM terminals 44 and
13. The oxygen (O

2

) sensor varies the voltage within a

range of about 1volt if the exhaust is rich, down to about
100mm volts if the exhaust is lean. The O

2

 sensor is like

an open circuit and produces no voltage when it is below
360

°

C(600

°

F). An open O

2

 sensor circuit or a cold O

2

sensor causes “open loop” operation.

Conditions for Setting the DTC

D

Heated oxygen sensor 5V reference voltage supply
circuit high voltage or ground.

D

Heated oxygen sensor 5V reference voltage supply
circuit open.

Action Taken when the DTC Sets

D

Emission related.

D

“Armed” after two trip with a fail.

D

“Disarmed” after one trip with a pass.

D

MIL on if failure is detected in three consecutive trips.

D

Stores a History DTC on the third consecutive with a
fail (The DTC will be armed after the second fail).

D

Stores a Freeze Frame on the third consecutive trip
with a fail (if empty).

Conditions for Clearing the MIL/DTC

D

The MIL will turn off after four consecutive ignition
cycles in which the diagnostic runs without a fault.

D

A history DTC will clear after 40 consecutive warm up
cycles without a fault.

D

DTC(s) can be cleared by using the scan tool.

Diagnostic Aids

D

Normal scan tool voltage varies between 0.1volts and
0.9 volts while in closed loop.

D

Inspect the oxygen (O

2

) sensor wire. The O

2

 sensor

may be positioned incorrectly and contacting the ex-
haust manifold.

D

Check for an intermittent ground in the wire between
the O

2

 sensor and the engine control module.

D

Perform an injector 2alance test to determine if a re-
stricted fuel injector may be causing the lean condi-
tion.

D

Vacuum of crankcase leaks will cause a lean running
condition.

D

An exhaust manifold gasket leak of a cracked ex-
haust manifold may cause outside air to be pulled into
the exhaust and past the sensor.

ENGINE CONTROLS  1F – 105

DTC P0141 – Heated Oxygen Sensor Heater Malfunction

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. Turn the ignition switch to LOCK.
2. Disconnect the Heated O2 sensor connector and

engine control module (ECM) connector.

3. Check the Heated O2 sensor heater wire

between the Heated O2 sensor connector
terminal 4 and ECM connector terminal 35 for an
open or short to ground.

Is the problem found?

–

Go to Step 3

Go to Step 4

3

1. Repair the wire of the connector terminal as

needed.

2. Clear the DTCs from the ECM.
3. Road tests the vehicle.
4. Perform the diagnostic system check.
Is the repair complete?

–

System OK

–

4

1. Turn the ignition switch to LOCK.
2. Replace the Heated O2 sensor.
3. Road tests the vehicle.
4. Perform the diagnostic system check.
Is the replacement complete?

–

Go to Step 6

–

5

Check if any additional DTCs are set.
Are any DTCs displaced that have not been
diagnosed?

–

Go to

applicable DTC

table

System OK