P0137 Part 2 of 2

DTC P0137

CONDITIONS FOR SETTING THE DTC

P0130
- The control module detects that the Loop Status parameter is open.
- DTC P0130 sets within 50 seconds when the above condition is met.

P0131 Lean Test
- The control module detects that the HO2S 1 Voltage parameter is less than 50 mV.
- DTC P0131 sets within 100 seconds during the lean test when the above condition is met.

P0131 Power Enrichment Test
- The control module detects that the HO2S 1 Voltage parameter is less than 550 mV.
- DTC P0131 sets within 100 seconds during the power enrichment test when the above condition is met.

P0132 Rich Test
- The control module detects that the HO2S 1 parameter is more than 1,000 mV.
- DTC P0132 sets within 15 seconds during the rich test when the above condition is met.

P0132 Decel Fuel Cutoff Test
- The control module detects that the HO2S 1 parameter is more than 350 mV.
- DTC P0132 sets within 40 seconds during the decel fuel cutoff test when the above condition is met.

P0133
- The control module detects that the HO2S 1 rich-to-lean or lean-to-rich average response time is more than 0.2 second.
- DTC P0133 sets within 60 seconds when the above condition is met.

P0134
- The control module detects that the HO2S 1 parameter is between 400-500 mV.
- DTC P0134 sets within 100 seconds when the above conditions are met.

P0136
1. The control module detects that the HO2S 2 did not transition below 250 mV and above 650 mV during the passive test.
2. One of the following tests fail:

Lean Intrusive Test
- The control module detects that the HO2S 2 is more than 250 mV for 10 seconds.
- The HO2S 1 is less than 350 mV.

Rich Intrusive Test
- The control module detects that the HO2S 2 is less than 650 mV for 10 seconds.
- The HO2S 1 is more than 550 mV.

3. DTC P0136 sets within 7 minutes when the above conditions are met.

P0137 Lean Test
- The control module detects that the HO2S 2 voltage parameter is less than 50 mV.
- DTC P0137 sets within 100 seconds during the lean test when the above condition is met.

P0137 Power Enrichment Test
- The control module detects that the HO2S 2 voltage parameter is less than 650 mV and the HO2S 1 parameter is more than 700 mV.
- DTC P0137 sets within 10 seconds during the power enrichment test when the above condition is met.

P0138 Rich Test
- The control module detects that the HO2S 2 voltage parameter is more than 1,000 mV.
- DTC P0138 sets within 100 seconds during the rich test when the above condition is met.

P0138 Decel Fuel Cutoff Test
- The control module detects that the HO2S 2 voltage parameter is more than 300 mV.
- DTC P0138 sets within 10 seconds during the decel fuel cutoff test when the above condition is met.

P0140
- The control module detects that the HO2S 2 parameter is between 425-475 mV.
- DTC P0140 sets within 100 seconds when the above conditions are met.

P1133
- The control module detects that the HO2S 1 rich-to-lean counts, or the lean-to-rich counts are less than a calibrated value.
- DTC P1133 sets within 60 seconds when the above condition is met.

P1134
- The PCM detects that the difference between the HO2S 1 rich-to-lean average transition time and the lean-to-rich average transition time is more than a calibrated value.
- DTC P1134 sets within 60 seconds when the above condition is met.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (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 THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (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 the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
- Allow the engine to reach operating temperature. With the engine running, observe the affected HO2S parameter with a scan tool.
- The HO2S 1 value should vary from below 200 mV to above 800 mV and respond to fueling changes.
- The HO2S 2 value should change more than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and back to closed after running the engine at 1500 RPM for 30 seconds.
- If any HO2S heater DTCs are set then diagnose those DTCs first.
- The affected HO2S may be damaged due to contamination. Prior to replacing the affected HO2S, inspect for the following sources of contamination:

- A silicon contaminated HO2S

NOTE: Refer to Silicon Contamination of Heated Oxygen Sensors Notice.

- Fuel contamination-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool). Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool) Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool)
- Engine oil consumption-Refer to Oil Consumption Diagnosis. Oil Consumption Diagnosis
- Engine coolant consumption-Refer to Loss of Coolant. Loss of Coolant

CIRCUIT/SYSTEM TESTING
1. With the engine running at operating temperature, observe the affected HO2S sensor parameter with a scan tool and manipulate the related wiring and connectors. Manipulation should not affect the parameter.
- If manipulation does affect the parameter then repair the harness or connector.
2. With the ignition ON, the engine OFF, and the sensor disconnected, measure for approximately 45 mV from the affected HO2S sensor low signal circuit to ground.
- If more than approximately 45 mV, test the affected HO2S sensor low signal circuit for a short to voltage or a faulty control module.
- If less than approximately 45 mV, test the affected HO2S sensor low signal circuit for high resistance or for a faulty control module.
3. With the ignition ON, the engine OFF, and the sensor disconnected, measure for approximately 450 mV from the affected HO2S sensor high signal circuit to ground.
- If more than approximately 450 mV, test the affected HO2S sensor High Signal circuit and the affected HO2S sensor low signal circuit for a short to voltage or a faulty control module.
- If less than approximately 450 mV, test the affected HO2S sensor high signal circuit for high resistance or for a faulty control module.
4. With the ignition ON, the engine OFF, and the sensor disconnected, install a 3-amp fused jumper between the affected HO2S sensor high signal circuit and the affected HO2S sensor low signal circuit. The affected HO2S parameter should indicate 0 mV.
- If all circuits and connectors test normal and the affected HO2S parameter does not indicate 0 mV, then replace the control module.
5. With the ignition ON, the engine OFF, and the sensor disconnected, install a test lamp between the affected HO2S sensor high signal circuit and battery voltage. The affected HO2S parameter should indicate approximately 1,095 mV.
- If all circuits and connectors test normal and the affected HO2S parameter does not indicate 1,095 mV then replace the control module.
6. If the control module and all circuits test normal, replace the affected HO2S sensor.

REPAIR INSTRUCTIONS

NOTE: Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice.

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Heated Oxygen Sensor Replacement - Position 1
- Heated Oxygen Sensor Replacement - Position 2
- Control Module References for replacement, setup, and programming Verification Tests