DTC P0133 HO2S Slow Response Bank 1
Sensor 1
The PCM continuously
monitors the Heated Oxygen Sensor (HO2S) activity. The PCM counts the number of
times that a rich to lean and a lean to rich response is indicated. Then, the
PCM adds the amount of time it took to complete all transitions for a 100 second
test period. With this information, an average time for each transition can be
determined. If the average response time is too slow, a DTC P0133 will be
set. A lean to rich transition is indicated when the HO2S voltage changes from
less than 300 mV to greater than 600 mV. A rich to lean transition is
indicated when the HO2S voltage changes from greater than 600 mV to less
than 300 mV. An HO2S that responds too slowly is likely to be faulty and
should be replaced.
Conditions
for Setting the DTC
- No TP sensor, EVAP system, EGR,
misfire, IAT sensor, MAP sensor, fuel trim, HO2S 1 Heater, fuel injector
circuit, EGR Pintle, ECT sensor, CKP sensor, or MAF sensor DTCs are set.
- The engine has been running in
closed loop for at least 1 minute.
- Engine speed is between
1000 RPM and 3000 RPM.
- Engine Coolant Temperature greater
than 50°C (122°F).
- Mass Air Flow is between the
following limits:
- Automatic Transaxle - Between
15 g/s and 29 g/s.
- Manual Transaxle - Between
10 g/s and 30 g/s.
- Automatic Transaxle - Bank 1 H02S 1
lean to rich and rich to lean average transition response time was longer
than 90 milliseconds.
- Manual Transaxle - Bank 1 H02S 1
lean to rich average transition response time was longer than
150 milliseconds. The rich to lean average transition response time
was longer than 130 milliseconds.
- The conditions are present during
the 100 second response test period.
Action
Taken When the DTC Sets
- The PCM will illuminate the MIL
during the second consecutive trip in which the diagnostic test has been
run and failed.
- The PCM will store conditions which
were present when the DTC set as Freeze Frame and Fail Records data.
Conditions
for Clearing the MIL/DTC
- The PCM will turn the MIL OFF during
the third consecutive trip in which the diagnostic has been run and
passed.
- The history DTC will clear after 40
consecutive warm-up cycles have occurred without a malfunction.
- The DTC can be cleared by using the
scan tool Clear Information function or by disconnecting the PCM battery
feed.
Check for the following
conditions:
- Poor connection at the PCM - Inspect
harness connectors for the following conditions:
- Backed out terminals.
- Improper mating.
- Broken locks.
- Improperly formed or damaged
terminals.
- Poor terminal to wire connection.
- Damaged harness -- Inspect the
wiring harness for damage. If the harness appears to be OK, observe the
Bank 1 H02S 1 display on the scan tool while moving connectors and wiring
harnesses related to the sensor. A change in the display will indicate the
location of the fault.
If DTC P0133 cannot
be duplicated, Review the Fail Records vehicle mileage since the diagnostic
test last failed. This may help determine how often the condition that caused
the DTC to be set occurs.
Number(s) below refer to
the Step number(s) on the Diagnostic Table:
|
DTC P0133 - HO2S Slow Response Bank 1 Sensor 1 Step |
Action |
Value(s) |
Yes |
No |
|
Was
the Powertrain On-Board Diagnostic (OBD) System
Check performed? |
-- |
Go to the A
Powertrain On Board Diagnostic (OBD) System Check
|
||
|
Important If any DTCs are set,(Except P0153, P1133, P1134, P1135, P1136, P1153, P1154,
P1155, and/or P1156), refer to those DTCs before proceeding with this
diagnostic table.
Does
scan tool indicate DTC P0133 failed this ignition? |
-- |
Go to Diagnostic Aids |
||
|
Did
the scan tool also indicate DTC P0153, P1133, P1134, P1135, P1136,
P1153, P1154, P1155, and/or P1156 failed this ignition? |
-- |
|||
Was
an exhaust leak isolated? |
-- |
|||
|
Visually/physically
inspect the following items:
Was
a problem found in any of the above areas? |
-- |
|||
Does
the scan tool indicate voltage near the specified value? |
450 mV |
|||
Does
scan tool indicate voltage below specified value? |
300 mV |
|||
|
Replace
affected Heated Oxygen Sensors. Refer to Heated
Oxygen Sensor (HO2S) Replacement . Important: Determine and correct the
cause of the contamination before replacing sensors. Check for the following
conditions:
Is
the action complete? |
-- |
-- |
||
|
Repair
condition as necessary. Is the action complete? |
-- |
-- |
||
|
Repair
an open Bank 1 HO2S 1 low signal circuit or a grounded Bank 1 HO2S 1 high
signal circuit. Refer to Heated
Oxygen Sensor (HO2S) Replacement . Is the action complete? |
-- |
-- |
||
|
Repair
open Bank 1 HO2S 1 high signal circuit or faulty PCM connections. Refer to Heated
Oxygen Sensor (HO2S) Replacement . Is the action complete? |
-- |
-- |
||
|
Replace
Bank 1 HO2S 1. Heated
Oxygen Sensor (HO2S) Replacement . Is the action complete? |
-- |
-- |
||
Does
the scan tool indicate DTC P0133 failed this ignition? |
-- |
System OK |