6E1–127
X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DIAGNOSTIC TROUBLE CODE (DTC) P0135 O2 SENSOR HEATER CIRCUIT
MALFUNCTION
D06RX119
Circuit Description
Heated oxygen sensors are used to minimize the amount
of time required for “Closed Loop” fuel control operation
and to allow accurate catalyst monitoring. The oxygen
sensor heater greatly decreases the amount of time
required for fuel control sensors Bank 1 HO2S 1.
The engine control module (ECM) will run the heater test
only after a cold start (determined by engine coolant and
intake air temperature at the time of start–up) and only
once during an ignition cycle. When the engine is started
the ECM will monitor the HO2S voltage. When the HO2S
voltage indicates a sufficiently active sensor, the ECM
looks at how much time has elapsed since start–up. If the
ECM determines that too much time was required for the
Bank 1 HO2S 1 to become active, a Diagnostic Trouble
Code P0135 will set. DTC P0135 is a type B code.
Conditions for Setting the DTC
D
No related Diagnostic Trouble Codes.
D
Intake air temperature (IAT) is less than 32
°
C (90
°
F)
at start–up.
D
Engine coolant temperature (ECT) is less than 32
°
C
(90
°
F) at start–up.
D
IAT and ECT are within 5
°
C (9
°
F) of each other at
start–up.
D
Ignition voltage is between 11 and 16.6 V.
D
Average calculated air flow is less than 18 g/second
during sample period.
D
Throttle angle is less than 40%.
D
Bank 1 HO2S 1 voltage does not change more than
148 mV from the bias voltage (between 400 mV and
500 mV) for a longer amount of time than it should. The
maximum amount of time to come up to operating
range is 240 seconds. This warm–up time depends on
the engine coolant temperature at start–up and intake
air temperature at start–up.
Action Taken When the DTC Sets
D
The ECM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.
D
The ECM will store conditions which were present
when the Diagnostic Trouble Code was set as Freeze
Frame and in the Failure Records data.
Conditions for Clearing the MIL/DTC
D
The ECM will turn the MIL OFF on the third consecutive
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.
D
A history Diagnostic Trouble Code P0135 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.
D
Diagnostic Trouble Code P0135 can be cleared by
using the Scan Tool’s ”Clear Info” function.