Dtc P0133 Or P0153 - Suzuki XL7 2007 Service Manual

DTC P0133 or P0153

Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
• Review "Strategy Based Diagnosis: " for an overview of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle Diagnostic Information: " provides an overview of each diagnostic
category.
DTC Descriptors
DTC P0133: HO2S Slow Response Bank 1 Sensor 1
DTC P0153: HO2S Slow Response Bank 2 Sensor 1
Diagnostic Fault Information
Circuit
HO2S Bank 1 Sensor 1 Signal
HO2S Bank 1 Sensor 2 Signal
HO2S Bank 2 Sensor 1 Signal
HO2S Bank 2 Sensor 2 Signal
Low Reference
Circuit Description
The heated oxygen sensors (HO2S) are used for fuel
control and catalyst monitoring. Each HO2S compares
the oxygen content of the surrounding air with the
oxygen content of the exhaust stream. When the engine
is started, the control module operates in an Open Loop
mode, ignoring the HO2S signal voltage while
calculating the air-to-fuel ratio. The control module
supplies the HO2S with a reference, or bias voltage of
about 450 mV. While the engine runs, the HO2S heats
up and begins to generate a voltage within a range of 0-
1,000 mV. This voltage will fluctuate above and below
the bias voltage. Once sufficient HO2S voltage
fluctuation is observed by the control module, Closed
Loop is entered. The control module uses the HO2S
voltage to determine the air-to-fuel ratio. An HO2S
voltage that increases above bias voltage toward 1,000
mV indicates a rich fuel mixture. An HO2S voltage that
decreases below bias voltage toward 0 mV indicates a
lean fuel mixture.
The heating elements inside each HO2S heat the sensor
to bring the sensor up to operating conditions faster. This
allows the system to enter Closed Loop earlier and the
control module to calculate the air-to-fuel ratio sooner.
Engine General Information and Diagnosis:
Short to Open/High
Ground Resistance
P0131 P0134, P0135
P0137 P0140
P0151 P0154, P0155
P0157 P0160
P0134, P0135,
—
P0154, P0155
Conditions for Running the DTCs
• Before the ECM can report that DTC P0133 or P0153
failed, DTCs P0030, P0031, P0032, P0050, P0051,
P0052, P0135, and P0155 must run and pass.
• DTCs P0036, P0037, P0038, P0057, P0058, P0137,
P0138, P0140, P0141, P0157, P0158, P0160, P0161,
P0300, P0301, P0302, P0303, P0304, P0305, P0306,
P0442, P0443, P0455, P0458, P0459, P2096, P2097,
P2098, P2099, P2177, P2178, P2179, P2088, P2089,
P2090, P2231, P2232, P2234, P2235, P2270, P2271,
P2272, and P2273 are not set.
• The engine speed is 1,800-2,400 RPM.
• The primary HO2S is in closed loop.
• The engine load is 40-70 percent.
• The exhaust gas temperature is greater than 350°C
(662°F).
• The evaporative purge (EVAP) solenoid is
commanded OFF or ON for greater than 10 seconds.
• DTC P0133 and P0153 run continuously once the
conditions above exist.
Signal
Short to Voltage
Performance
P0133, P2096,
P0132
P2097
P0138 P0140
P0153, P2098,
P0152
P2099
P0158 P0160
—
1A-88
—