P1154

Diagnostic Chart:

Wiring Diagram:

Circuit Description
Use this diagnostic test in conjunction with the HO2S (Bank 2, Sensor 1) slow response diagnostic test (P0153). The ratio of the response times that were calculated are compared to the calibrated limits. If the number of both the lean to rich transitions (switches) and the 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. DTC P1154 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 P0151, P0152, P0154, and DTC P0155 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 above conditions are met for a time greater than 2 seconds.

Action Taken When the DTC Sets
The VCM turns on the Malfunction Indicator Lamp (MIL) after 2 consecutive test failures. The VCM records the operating conditions at the time the diagnostic fails. The Freeze Frame and Failure Records store this information.

Conditions for Clearing the MIL/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 40 consecutive warm-up cycles with no failures of any emission related diagnostic test. The VCM battery voltage is interrupted. The scan tool Clear Info function is used.

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 in the diagnostic table.

2. This step check if the 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 Oxygen sensor voltage should rapidly swing above 0.60 volts and below 0.30 volts.
5. This step checks to see if the HO2S voltage is swinging between rich and lean very slowly or not at all.
9. This step checks for causes of the HO2S failure. If the HO2S sensor is replaced without finding the cause of the contamination, the replacement sensor may become contaminated.