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. If 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 Diagnostic Trouble Code (DTC) is a type B DTC.

Conditions for Setting the DTC
The following conditions sets the DTC:

HO2 Diagnostic Enable

^ No TP sensor DTCs.
^ No EVAP DTCs.
^ No IAT sensor DTCs.
^ No MAP DTCs.
^ No EGR DTCs.
^ No ECT sensor DTCs.
^ No misfire DTCs.
^ No intrusive test in progress.
^ No device controls active.
^ System voltage is greater than or equal to 9V.

Response Test Enable

^ Closed Loop Low MAP not active.
^ Closed Loop Mode 0 not active.
^ DTCs P0131, P0132, P0134 and P0135 not active.
^ Closed Loop.
^ ECT is greater than 57°C.
^ Engine run time is greater than 75 seconds.
^ Air Flow is greater than 15 g/s but less than 3000 RPM.
^ Canister purge duty cycle is greater than 0%.
^ Above present for greater than 2 seconds.

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 in Engine Electrical.

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.