1F–88 ENGINE CONTROLS
DAEWOO M-150 BL2
MAA1F130
DIAGNOSTIC TROUBLE CODE (DTC) – P0132 OXYGEN SENSOR HIGH
VOLTAGE
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 O2 sensor is like
an open circuit and produces no voltage when it is below
350°C(600°F). An open O2 sensor circuit or a cold O2
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.
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.
Inspect the oxygen (O2) sensor wire. The O2 sensor
may be positioned incorrectly and contacting the ex-
haust manifold.
Check for an intermittent ground in the wire between the
O2 sensor and the engine control module.
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.
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