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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1857 (Engine Controls And Fuel - 3.5L (L66) - DTC P0030 To DTC P0222) >> DTC P0135 or P0155 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 4:  This step tests for high resistance in the ignition 1 voltage circuit of the HO2S. If the DMM does not display near battery voltage, repair the high resistance in the ignition 1 voltage circuit.
  2. 5:  This step tests the HO2S heater control circuit for a high resistance. Six amps through the DMM is normal when the HO2S heater control circuit is commanded ON with a scan tool. A high resistance in the circuit will cause the amperage to be less than 1 amp. Test the HO2S heater control circuit for a high resistance if the DMM displays a reading of less than 1 amp.
  3. 9:  This step tests the HO2S input pump current circuit for a wire to wire short to the reference voltage circuit or a condition internal to the PCM. If the resistance measured between the circuits is more than 110,000 ohms, the PCM and the circuits are OK.
  4. 10:  This step isolates the condition. Test for a wire to wire short between the HO2S input pump current and reference voltage circuits, if any continuity exists between the circuits.
  5. 15:  Inspect the HO2S connector for water intrusion, corrosion, and bent or damaged terminals.
  6. 16:  Inspect the PCM connectors for water intrusion, corrosion, and bent or damaged terminals.
DTC P0135 or P0155

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
IMPORTANT: DTC P0135 is for bank 1 sensor 1 - rear and DTC P0155 is for bank 2 sensor 1 - front.
  1. Start the engine.
  2. Allow the engine to reach operating temperature.
  3. Observe the DTC info with a scan tool for at least 90 seconds.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Step 3 
3
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records that you observed.
Does the DTC fail this ignition?		 - Go to Step 4  Go to Diagnostic Aids In This Test
4 
  1. Turn OFF the ignition.
  2. Disconnect the affected heated oxygen sensor (HO2S) 1 connector.
  3. Turn ON the ignition.
  4. Connect a test lamp between the ignition 1 voltage circuit of the HO2S and a good ground.
  5. Connect a DMM to the probe of the test lamp and a good ground. Refer to Measuring Voltage Drop .
Does the voltage measure at the specified value?		 B+ Go to Step 5  Go to Step 17 
5 
  1. Set up a DMM to test amperage on the 10 amp scale.
  2. Connect the DMM between the ignition 1 circuit and the heater control circuit of the HO2S.
  3. Observe the amperage on the DMM while the HO2S heater is being commanded ON with a scan tool.
Is the amperage more than the specified value?		 1 A Go to Step 6  Go to Step 11 
6 Measure the voltage between the HO2S reference voltage circuit and a good ground with a DMM.
Is the voltage within the specified range?		 3.3-3.8 V Go to Step 7  Go to Step 12 
7 Measure the voltage between the HO2S low reference circuit and a good ground with a DMM.
Is the voltage within the specified range?		 5.9-6.4 V Go to Step 8  Go to Step 13 
8 Measure the voltage between the HO2S input pump current circuit and a good ground with a DMM.
Is the voltage within the specified range?		 3.3-3.8 V Go to Step 9  Go to Step 14 
9 
  1. Turn the ignition OFF for 1 minute.
  2. Measure the resistance between the HO2S input pump current circuit and the HO2S reference voltage circuit.
Is the resistance less than the specified value?		 110 KΩ Go to Step 10  Go to Step 15 
10 
  1. Disconnect the appropriate powertrain control module (PCM) connector.
  2. Measure the resistance between the HO2S input pump current circuit and the HO2S reference voltage circuit.
Is the resistance at the specified value?		 OL Go to Step 16  Go to Step 18 
11 Test the HO2S heater control circuit for a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 21  Go to Step 16 
12 Test the HO2S reference voltage circuit for an open, a high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 21  Go to Step 16 
13 Test the HO2S low reference circuit for one of the following conditions:
  • An open
  • A high resistance
  • A short to voltage
  • A short to the HO2S pump current circuit
  • A short to the HO2S reference voltage circuit-Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?		 - Go to Step 21  Go to Step 16 
14 Test the HO2S input pump current circuit for an open, a high resistance, or a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 21  Go to Step 16 
15  Test for shorted terminals and for poor connections at the HO2S. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 21  Go to Step 19 
16  Test for shorted terminals and for poor connections at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 21  Go to Step 20 
17 Repair the open or high resistance in the HO2S heater ignition 1 circuit. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 21  -
18 Repair the short between the HO2S input pump current circuit and the HO2S reference voltage circuit.
Did you complete the repair?		 - Go to Step 21  -
19 Replace the HO2S. Refer to the appropriate procedure:
Did you complete the replacement?		 - Go to Step 21  -
20
  1. Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
  2. Perform the idle learn procedure. Refer to Idle Learn .
Did you complete the replacement?		 - Go to Step 21  -
21
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 22 
22 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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