DTC P1153 HO2S Insufficient Switching Bank 2 Sensor 1


Object Number: 218509  Size: PAGE-WIDE
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Circuit Description

The PCM monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this monitor period the PCM counts the number of times that the HO2S switches from rich to lean and lean to rich. A DTC P1153 sets when the PCM determines that the HO2S did not switch enough times.

A lean to rich switch is determined when the HO2S voltage changes from less than 300 mV to greater than 600 mV. A rich to lean switch is determined when the HO2S voltage changes from more than 600 mV to less than 300 mV.

Conditions for Running the DTC

Conditions for Setting the DTC

The PCM determines that within 100 seconds the HO2S lean to rich switches are less than 30 and rich to lean switches are less then 30.

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Diagnostic Aids

For an intermittent, refer to Symptoms .

Test Description

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

  1. This step determines if the fault is present. This test may take 5 minutes for the diagnostic to run.
  1. When DTCs P1133 and P1153 are set at the same time, is good indication that a fuel contamination condition is present.
  1. An exhaust leak 6 to 12 inches away from the HO2S can cause a DTC to set.
  1. This step tests whether a good ground circuit is available.
  1. This step tests the integrity of the signal circuit to the PCM.
  1. Certain RTV silicone gasket materials give off vapors that can contaminate the HO2S. There is also a possibility of silicone contamination caused by silicone in the fuel. If the sensors appear contaminated by silicone and all the silicone sealant is a non-silicone base, advise the customer to try a different fuel company. A missing fuel filler restrictor, indicates the customer may have used leaded fuel.

Step

Action

Value(s)

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to A Powertrain On Board Diagnostic (OBD) System Check

2

Important

If any DTCs are set (Except P1133), refer to those DTCs before proceeding with this diagnostic table.

  1. Install a scan tool.
  2. Idle the engine at the normal operating temperature.
  3. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.
  4. Monitor the Diagnostic Trouble Code (DTC) Information using the scan tool.

Does the scan tool indicate DTC P1153 test failed?

--

Go to Step 3

Go to Diagnostic Aids

3

Did the scan tool also indicate P1133 test failed?

--

Go to Step 8

Go to Step 4

4

  1. Inspect the exhaust system for leaks. Refer to Exhaust Leakage in Engine Exhaust.
  2. If you find an exhaust leak, repair the exhaust as necessary.

Did you isolate an exhaust leak?

--

Go to Step 13

Go to Step 5

5

Visually/physically inspect the following items:

  • Ensure that the HO2S is securely installed.
  • Inspect for corrosion on the terminals.
  • Test the terminal tension at the HO2S and at the PCM connector. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
  • Inspect for damaged wiring. Refer to Wiring Repairs in Wiring Systems.

Did you find a condition in any of the above areas?

--

Go to Step 9

Go to Step 6

6

  1. Disconnect the Bank 2 HO2S 1.
  2. Jumper the HO2S low (PCM side) signal circuit to a ground.
  3. Monitor the Bank 2 HO2S 1 voltage using the scan tool.

Is the HO2S voltage within the specified range?

350-550 mV

Go to Step 7

Go to Step 10

7

  1. Jumper the Bank 2 HO2S 1 high and low (PCM side) signal circuits to a ground.
  2. Monitor the Bank 2 HO2S 1 voltage using the scan tool.

Is the HO2S voltage below the specified value?

200 mV

Go to Step 12

Go to Step 11

8

Important

Before replacing a sensor, determine and correct the cause of the contamination. Inspect for the following conditions:

  • Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
  • Use of improper RTV sealant.
  • Engine oil/coolant consumption.

Replace the affected Heated Oxygen sensor. Refer to Heated Oxygen Sensor (HO2S) Replacement - Bank 1 or Heated Oxygen Sensor (HO2S) Replacement - Bank 2 . Is the action complete?

--

Go to Step 13

--

9

Repair the condition as necessary. Is the action complete?

--

Go to Step 13

--

10

Repair the open Bank 2 HO2S 1 low signal circuit or grounded Bank 2 HO2S 1 high signal circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete?

--

Go to Step 13

--

11

Repair the open Bank 2 HO2S 1 high signal circuit or faulty PCM connections. Refer to Wiring Repairs or Intermittents and Poor Connections Diagnosis in Wiring Systems. Is the action complete?

--

Go to Step 13

--

12

Replace the Bank 2 HO2S 1. Refer to Heated Oxygen Sensor (HO2S) Replacement - Bank 2 . Is the action complete?

--

Go to Step 13

--

13

  1. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
  2. Idle the engine at the normal operating temperature.
  3. Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?

--

Go to Step 14

Go to Step 2

14

Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed?

--

Go to the applicable DTC table

System OK

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