P1134

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 DTC is a type B DTC.

CONDITIONS FOR SETTING THE DTC
The following conditions will set the DTC:

^ No fuel trim DTCs.
^ The L/R switches less than 30.
^ The R/L switches less than 30.
^ No TP sensor DTCs.
^ No Evaporative Emissions (EVAP) sensor DTCs.
^ No IAT sensor DTCs.
^ No MAP DTCs.
^ No EGR DTCs.
^ No ECT sensor DTCs.
^ DTC P0131, P0132, P0134, P0135 are not set.
^ A Closed Loop.
^ HO2S voltage between 0.300 volts and 0.600 volts.
^ Throttle position greater than 10% but less than 20%.
^ The average response time calculations completed for this ignition cycle.
^ The ratio of HO2S LR/RL transitions is less than expected.

ACTION TAKEN WHEN THE DTC SETS
^ The VCM turns on the MIL (Malfunction Indicator Lamp) 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 tail.
^ 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.