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DTC P1133: HO2S CIRCUIT - INSUFFICIENT SWITCHING (BANK 1; SENSOR 1)
Circuit Description
Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares
the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach
operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimize the
time required for the sensors to reach operating temperature. The Engine Control Module (ECM) supplies the
HO2S with a reference or bias voltage of about 450 mV. When the engine is first started the ECM operates in
Open Loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperatures and Closed
Loop is achieved, the HO2S generates a voltage within a range of 0-1000 mV that fluctuates above and below
bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust
stream. This diagnostic will only run once per ignition cycle. The ECM monitors the number of rich-to-lean and
lean-to-rich transitions. A transition is defined as the HO2S voltage changes from greater than 600 mV to less
than 300 mV or from less than 300 mV to greater than 600 mV. If the ECM detects that the number of
transitions were less than a specified value, DTC P1133 will set.
Conditions For Running DTC
DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0125, P0128, P0201 P0202,
P0203, P0204, P0300-P0304, P0336, P0440, P0442, P0446, P0452, P0453, P0506, P0507, P0601, P0602,
P0604, P0606, P1120, P1220, P1221, P1271, P1275, P1280, P1441, P1512, P1514, P1515, P1516,
P1621, P1635, P1639, P1680, or P1681 not set.
ECT sensor parameter is greater than 158°F (70°C).
Engine speed parameter is 1000-3500 RPM.
Ignition 1 signal parameter is greater than 10 volts.
Engine run time parameter is more than 200 seconds.
Loop status parameter is closed.
TP angle parameter is 5-60 percent.
EVAP purge solenoid DC parameter is greater than 10 percent.
NOTE: To locate components, see COMPONENT LOCATIONS . For circuit reference,
see ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in
ELECTRICAL. For connector terminal identification, see CONNECTOR
IDENTIFICATION .
Fuel level sensor parameter is greater than 10 percent.
MAP sensor parameter is 10-104 kPa.
Conditions are met for 60 seconds.
Conditions For Setting DTC
ECM detects that the HO2S 1 rich-to-lean counts is less than 2 or the lean-to-rich counts is less than 2.
Action Taken When DTC Sets
The control module illuminates the Malfunction Indicator Light (MIL) on the second consecutive ignition
cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the
diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic
reports a failure on the second consecutive ignition cycle, the control module records the operating
conditions at the time of the failure. The control module writes the operating conditions to the Freeze
Frame and updates the Failure Records.
Conditions For Clearing MIL/DTC
The control module turns off the Malfunction Indicator Light (MIL) after 3 consecutive ignition cycles
that the diagnostic runs and does not fail.
A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.
Clear MIL and DTC with scan tool.
Test Description
The numbers below refers to the step number in the diagnostic procedures.
1. 2 - When system is operating correctly, the HO2S 1 voltage should toggle above and below the specified
values. You may need to operate the vehicle within the Freeze Frame conditions and Conditions for
Setting the DTC in order to duplicate the malfunction that was detected by the ECM.
2. 4 - The specified value is what is measured on a correctly operating system.
3. 5 - The specified value is what is measured on a correctly operating system.
Diagnostic Procedures
1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE
CONTROLS under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine
controls, go to next step.
2.
Operate engine at normal operating temperature. Operate the engine at greater than 1200 RPM for 2
minutes. Observe the HO2S 1 voltage parameter with a scan tool. Does the scan tool indicate that the
HO2S 1 voltage is varying above and below the specified values of 350-550 mV? If yes, go to next step.
If no, go to step 4 .
3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Start engine.
Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING
DTC . You may also operate the vehicle within the conditions that you observed from the Freeze
Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, problem is
intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L & 3.0L VUE
article.
4. Turn ignition off. Disconnect the HO2S 1. Turn ignition on, with engine off. Measure the voltage from
the high signal circuit of the HO2S 1 on the vehicle harness side to a good ground with a DVOM. Does
the voltage measure within 350-550 mV? If yes, go to next step. If no, go to step 9 .
5. Turn ignition off. Connect a 3-amp fused jumper wire between the HO2S 1 high signal circuit and the
HO2S 1 low signal circuit. Turn ignition on. Monitor the HO2S 1 voltage for the sensor that applies to
this DTC with the scan tool. Does the scan tool indicate that the HO2S 1 voltage is less than 20 mV? If
yes, go to next step. If no, go to step 10 .
6. Turn ignition off. Remove the 3-amp fused jumper wire. Connect a test light between the ignition 1
voltage circuit and a good ground. DO NOT use the HO2S 1 heater low control. Turn ignition on, with
engine off. Does the test light illuminate? If yes, go to next step. If no, go to step 11 .
7. Connect a test light between the ignition 1 voltage circuit and the HO2S 1 heater low control circuit. Turn
ignition on, with engine off. Command the HO2S 1 heater ON and OFF with the scan tool. Does the test
light turn ON and OFF with each command? If yes, go to step 14 . If no, go to next step.
8. Does the test light remain illuminated with each command? If yes, go to step 12 . If no, go to step 13 .
9. Test HO2S 1 high signal circuit for an open, high resistance, short to ground, short to voltage, or short to
the HO2S 1 low signal circuit. Did you find and correct the condition? If yes, go to step 19 . If no, go to
step 16 .
10. Test HO2S 1 low signal circuit for an open, short to voltage, or high resistance. Did you find and correct
the condition? If yes, go to step 19 . If no, go to step 16 .
11. Test ignition 1 voltage circuit for an open, short to ground, or high resistance. Replace the EMISS fuse, if
necessary. Did you find and correct the condition? If yes, go to step 19 . If no, go to step 15 .
12. Test HO2S 1 heater low control circuit for a short to ground. Did you find and correct the condition? If
yes, go to step 19 . If no, go to step 16 .
13. Test HO2S 1 heater low control circuit for an open, short to voltage or high resistance. Did you find and
correct the condition? If yes, go to step 19 . If no, go to step 16 .
14.
NOTE: If any other DTCs are set except for HO2S DTCs, diagnose the other DTCs
first before proceeding with this test. See DIAGNOSTIC TROUBLE CODE
DEFINITIONS .
NOTE: Before replacing the HO2S 1, inspect and remove any source of
contamination.
Inspect for incorrect use of silicone RTV sealant, fuel contamination, exhaust leak, incorrectly installed
HO2S or damaged wiring. Did you find and correct the condition? If yes, go to step 19 . If no, go to next
step.
15. Inspect for poor connections at the harness connector of the HO2S 1. Did you find and correct the
condition? If yes, go to step 19 . If no, go to step 17 .
16. Inspect for poor connections at the harness connector of the ECM. Did you find and correct the
condition? If yes, go to step 19 . If no, go to step 18 .
17. Replace HO2S 1. After replacing sensor, go to step 19 .
18. Turn ignition off. Replace ECM. Perform ECM relearn procedure. See ELECTRONIC CONTROL
MODULE REPROGRAMMING under PROGRAMMING. After replacing ECM, go to next step.
19. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for
running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate vehicle within the
conditions observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to
step 2 . If no, go to next step.
20. With a scan tool, observe the stored information, Capture Info. Does the scan tool display any DTCs that
you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system
is okay.
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