P1134

Diagnostic Chart:

Wiring Diagram:

Circuit Description
Use this diagnostic test in conjunction with the HO2S (Bank 1 Sensor 1) slow response diagnostic test (P0133). The ratio of the response times that were calculated are compared to the calibrated limits. It the number of both lean to rich transitions (switches) and rich to lean transitions were both zero, then the ratios will set to 0. Otherwise, the ratio is calculated based on which average response time was greater. This DTC is a type B DTC.

Conditions for Setting the DTC

^ No Throttle Position (TP) sensor DTCs.
^ No EVAP DTCs.
^ No IAT sensor DTCs.
^ No MAP DTCs.
^ No ECT sensor DTCs.
^ No MAF sensor DTCs.
^ No intrusive test in progress.
^ No device controls active.
^ The system voltage is at least 9.0 volts.

Response Test Enable

^ Closed Loop.
^ Closed loop low MAP not active.
^ DTCs P0131, P0132, P0134, and DTC P0135 not active.
^ The ECT is greater than 57°C.
^ Engine run time is greater than 75 seconds.
^ MAF is at least 15 g/s and no more than 55 g/s.
^ Engine speed is at least 1100 RPM and no more than 3000 RPM.
^ The EVAP canister purge duty cycle is at least 0.0%.
^ The HO2S voltage is between 0.300 volts and 0.600 volts.

Action Taken When the DTC Sets

^ The VCM turns on the Malfunction Indicator Lamp (MIL) 2 consecutive failures.
^ The VCM records the operating conditions at the time the diagnostic fails. Freeze Frame and Failure Records stores this information.

Conditions for Clearing the MIL/DTC
The following conditions will clear the DTC:

^ The VCM turns the MIL off after 3 consecutive drive trips that the diagnostic runs and does not fail.
^ A Last Test Failed (current) DTC clears when the diagnostic runs and does not fail.
^ A History DTC clears after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.
^ The VCM battery voltage is interrupted.
^ Using the scan tool Clear Info function.

Diagnostic Aids
Never solder the HO2S wires. For a proper wire and connector repair refer to Wiring Repairs.

Test Description
The numbers below refer to the step numbers on the diagnostic table.

2. Checking if other possible causes of this DTC have already been diagnosed
3. With the engine running warm, coolant at least 85°C (185°F) and at fast idle, the HO2S voltage should rapidly swing above 0.60 volts and below 0.30 volts.
5. Checking if the HO2S voltage is swinging between rich and lean very slowly or not at all.
8. Checking for causes of HO2S failure. If the sensor is replaced with out finding the cause of contamination, the replacement sensor may become contaminated.