Daewoo MATIZ Service Manual page 186

1F – 88 ENGINE CONTROLS
DIAGNOSTIC TROUBLE CODE (DTC) – P0132 OXYGEN SENSOR HIGH
Circuit Description
The engine control module (ECM) supplies a voltage of
about 450mm volts between the ECM terminals 44 and
13. The oxygen (O2) 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
an open circuit and produces no voltage when it is below
350°C(600°F). An open O
sensor causes "open loop" operation.
Conditions for Setting the DTC
D The oxygen sensor voltage is more than 4.8V for at
least 0.2 seconds.
D A high voltage condition exists.
Action Taken when the DTC Sets
D The Malfunction Indicator Lamp (MIL) will illuminate.
D The ECM will record operating conditions at the time
the diagnostic fails. This information will be stored in
the Freeze Frame and Records buffers.
D A history DTC is stored.
Conditions for Clearing the MIL/DTC
D The MIL will turn off after consecutive ignition cycles
in which the diagnostic runs without a fault.
VOLTAGE
sensor is like
2
sensor circuit or a cold O
2
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.
D Disconnecting the ECM battery feed for 10 seconds.
Diagnostic Aids
Normal scan tool voltage varies between 0.1volts and
0.9volts while in closed loop.
2
Inspect the oxygen (O
may be positioned incorrectly and contacting the ex-
haust manifold.
Check for an intermittent ground in the wire between the
O sensor and the engine control module.
2
Perform an injector 2alance test to determine if a re-
stricted fuel injector may be causing the lean condition.
Vacuum of crankcase leaks will cause a lean running
condition.
An exhaust manifold gasket leak of a cracked exhaust
manifold may cause outside air to be pulled into the ex-
haust and past the sensor.
MAA1F130
) sensor wire. The O
2 2
DAEWOO M-150 BL2
sensor