Service Manual2006 Nubira-Lacetti Diagnostic Trouble Code (DTC) P1133

Nubira-Lacetti

Diagnostic Trouble Code (DTC) P1133

HO2S Insufficient Switching Sensor 1

Circuit Description

The Engine Control Module (ECM) continuously monitors the Front Heated Oxygen Sensor (HO2S1) activity for 100 seconds. During the monitor period, the ECM counts the number of times that the HO2S1 switches from rich to lean and from lean to rich. With this information, a total for all switches can be determined. If the number of switches is too low, a Diagnostic Trouble code (DTC) P1133 will set. The lean-to-rich and rich-to-lean are less than 15 switches.

Conditions for Setting the DTC

HO2S1 signal switches from 0.3 to 0.6 volts and 0.6 to 0.3 volts is less than 50 times within 90seconds.
Closed loop stoichiometry.
Engine Coolant Temperature (ECT) is greater than 70 °C (158 °F).
System voltage is greater than 10 volts.
Engine run time is greater than 60 seconds.
Purge Duty Cycle (DC) is less than 20%.
The rpm is between 1600 and 4300.
Airflow is between 5 and 40 g/sec for M/T.
Airflow is between 6 and 40 g/sec for A/T.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0131, P0132, P0134, P0135, P1167, P0171, P1171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P0405, P0406, P0506, P0507, P042E, and P0443 are not set.
2 second delay after conditions are met.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate after three consecutive ignition cycle with a fail.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
DTC can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

DTC P1133 is most likely caused by one of the following items:

Fuel Pressure - The system will go rich if the fuel pressure is too high. The ECM can compensate for some increase. However, if it gets too high, a DTC P1133 may set. Refer to "Fuel System Diagnosis" in this section.
Leaking injector - A leaking or malfunctioning injector can cause the system to go rich.
Manifold Absolute Pressure (MAP) sensor - An output that causes the ECM to sense a higher than normal manifold pressure (low vacuum) can cause the system to go rich. Disconnecting the MAP sensor will allow the ECM to set a fixed value for the MAP sensor. Substitute a different MAP sensor if the rich condition is gone while the sensor is disconnected.
Pressure regulator - Check for a leaking fuel pressure regulator diaphragm by checking for the presence of liquid fuel in the vacuum line to the pressure regulator.
Throttle Position (TP) sensor - An intermittent TP sensor output can cause the system to go rich due to a false indication of the engine accelerating.
HO2S1 contamination - Inspect the HO2S1 for silicone contamination from fuel or improper use of Room Temperature Vulcanizing (RTV) sealant. The sensor may have a white powdery coating and result in a high but false voltage signal (rich exhaust indication). The ECM will then reduce the amount of fuel delivered to the engine causing a severe surge or driveability problem.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Chart.

The On-Board Diagnostic (EOBD) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
The replacement ECM must be reprogrammed. Refer to the latest Techline procedure for ECM reprogramming.
If no malfunctions have been found at this point and no additional DTCs are set, refer to "Diagnostic Aids" in this section for additional checks and information.

DTC P1133 - HO2S Insufficient Switching Sensor 1

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Install a scan tool to the Data Link Connector (DLC). Turn the ignition ON. Are any additional Diagnostic Trouble Codes (DTCs) set?	-	Go to applicable DTC table	Go to Step 3
3	Start the engine and idle at normal operating temperature. Operate the vehicle within the specified parameter under the Conditions For Setting the DTC. Monitor the lean-to-rich transition and rich-to-lean transition and note the number of switches. Does the parameter show fewer transitions than the specified value within 90 seconds.	15	Go to Step 4	Go to Step 18
4	Visually/physically inspect for the following items: Front Heated Oxygen Sensor (HO2S1) is securely installed. Corrosion on the terminals. Terminal tension. HO2S1 wiring harness for poor terminal connection or damaged wiring. Is a problem found in any of the above areas?	-	Go to Step 9	Go to Step 5
5	Check the exhaust manifold for a leak near the engine and repair as needed. Is the repair complete?	-	Go to Step 3	Go to Step 6
6	Turn the ignition OFF. Disconnect the HO2S1 connector. Jumper the HO2S1 low circuit, terminal 4 to ground. Turn the ignition ON. Does the scan tool indicate the voltage between the specified value?	400-500 mV	Go to Step 7	Go to Step 10
7	Jumper the HO2S1 signal and low circuit terminal 2 to ground. Does the scan tool indicate the voltage below the specified value?	200 mV	Go to Step 8	Go to Step 11
8	Turn the ignition OFF. Replace the HO2S1. Note : before replacing the sensor, the cause of the contamination must be determined and corrected in order to prevent further damage to the sensor. Check for following: Fuel contamination. Use of improper Room Temperature Vulcanizing sealant. Engine oil/coolant consumption. Is the repair complete?	-	Go to Step 15	-
9	Repair the condition as needed. Is the repair complete?	-	Go to Step 15	-
10	Repair the HO2S1 signal circuit for a short to ground. Is the repair complete?	-	Go to Step 15	-
11	Remove the jumper wire. Using voltmeter measure the voltage between the HO2S1 signal circuit, terminal 2 and ground. Does the voltage above the specified value?	407 mV	Go to Step 12	Go to Step 13
12	Turn the ignition OFF. Disconnect the ECM connectors and check the continuity between terminal 1 of HO2S1 and the terminal M29 of the ECM. If the circuit measures over the specified value, repair open or poor connection as needed. Is the repair complete?	5 Ω	Go to Step 15	Go to Step 14
13	Turn the ignition OFF. Check the continuity between terminal 4 of HO2S1 and the terminal M12 of the ECM. If the circuit measures over the specified value, repair open or poor connection as needed. Is the repair complete?	5 Ω	Go to Step 15	Go to Step 14
14	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 15	-
15	Using the scan tool, clear the Diagnostic Trouble Codes (DTCs). Start the engine and idle at normal operating temperature. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text. Does the scan tool indicate that this diagnostic has run and passed?	-	Go to Step 16	Go to Step 2
16	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to Applicable DTC table	System OK

Diagnostic Trouble Code (DTC) P1134

HO2S Transition Time Ratio Sensor 1

Circuit Description

The Engine Control Module (ECM) monitors the Front Heated Oxygen Sensor (HO2S1) activity for 100 seconds after closed loop and stoichiometric operation have been established. During the monitoring period the ECM counts the number of times that the HO2S1 responds from rich to lean and adds the amount of time it took to complete all transitions. With this information, an average time for all transitions can be determined. The ECM then divides the -to-lean average by the lean-to-rich average to obtain the ratio. If the HO2S1 transition time ratio is not within the range, Diagnostic Trouble Code (DTC) P1134 will be set, indicating that the HO2S1 is not responding as expected to changes in exhaust oxygen content.

Conditions for Setting the DTC

HO2S1 rich-to-lean and lean-to rich transition ratio is out of specification(0.8 to 2.7 for M/T, 0.8 to 1.8 for A/T).
Closed Loop stoichiometry.
Engine Coolant Temperature (ECT) is greater than 70°C (158°F).
System voltage is greater than 10 volts.
Engine run time is greater than 60 seconds.
Purge Duty Cycle (DC) is less than 20%.
Engine speed is between 1200 and 3500 rpm.
Calculated airflow is between 5 and 40 g/sec for M/T.
Calculated airflow is between 6 and 40 g/sec for A/T.
DTCs P0106, P0107, P0108, P0117, P0118, P0122, P0123, P0131, P0132, P0134, P0135, P1167, P0171, P1171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0337, P0351, P0352, P0402, P0404, P042E, P0405, P0406, P0506, P0507, and P0443 are not set.
2 second delay after conditions are met.

Action Taken When the DTC Sets

The Malfunction Indicator Lamp (MIL) will illuminate after three consecutive ignition cycle with a fail.
The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
A history DTC is stored.
The vehicle will operate in Open Loop.

Conditions for Clearing the MIL/DTC

The MIL will turn off after four consecutive ignition cycles in which the diagnostic runs without a fault.
A history DTC will clear after 40 consecutive warm-up cycles without a fault.
The DTC(s) can be cleared by using the scan tool.
Disconnecting the ECM battery feed for more than 10 seconds.

Diagnostic Aids

A malfunction in the HO2S1 ignition feed or ground circuit may cause a DTC P1134 to set. Check HO2S1 circuitry for intermittent faults or poor connections. If connections and wiring are OK and DTC P1134 continues to set, replace the HO2S1.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how open the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Chart.

A condition that affects pre-converter and post-converter oxygen sensors indicates probable contamination. To avoid damaging replacement sensors, correct the condition which caused the contamination before replacing the affected sensors.
This step checks for conditions which may cause the oxygen sensor to appear faulty. Correct any of the described conditions if present.
To avoid damaging replacement sensors, correct the condition which caused the contamination before replacing the affected sensors

DTC P1134 - HO2S Transition Time Ratio Sensor 1

Step	Action	Value(s)	Yes	No
1	Perform an On-Board Diagnostic (EOBD) System Check. Was the check performed?	-	Go to Step 2	Go to "On-Board Diagnostic System Check"
2	Important : If any Diagnostic Trouble Codes (DTCs) are set, refer to those DTCs before processing with this diagnostic chart. Install a scan tool to the Data Link Connector (DLC). Start the engine and idle at normal operating temperature. Operate the engine within parameters specified under Conditions for Setting the DTC. Using a scan tool, monitor specific DTC info for DTC P1134 until the DTC P1134 test runs. Note the test result. Does the scan tool indicate DTC P1134 failed this ignition?	-	Go to Step 3	Go to "Diagnostic Aids"
3	Perform an exhaust system leak test. If an exhaust leak is found, repair as needed. The exhaust leak isolated?	-	Go to Step 14	Go to Step 4
4	Visually/physically inspect for the following items: Front Heated Oxygen Sensor (HO2S1) is securely installed. Corrosion on the terminals. Terminal tension. HO2S1 wiring harness for poor terminal connection or damaged wiring. Is a problem found in any of the above areas?	-	Go to Step 7	Go to Step 5
5	Turn the ignition OFF. Disconnect the HO2S1 connector. Turn the ignition ON. Using a voltmeter, measure the voltage between following terminals. Terminal 2 of Engine Control Module (ECM) side HO2S1 connector and ground. Terminal 4 of ECM side HO2S1 connector and ground. Are both voltages in the specified value?	3-5 v	Go to Step 6	Go to Step 8
6	With the HO2S1 disconnected, jumper the ECM side HO2S1 connector terminals 2 and 4. Turn the ignition ON. Using a scan tool, monitor the HO2S1 voltage. Does the scan tool indicates less than 10 millivolts and immediately return to about 450 millivolts when the jumper is removed?	-	Go to Step 10	Go to Step 9
7	Repair conditions as needed. Is the action complete?	-	Go to Step 14	-
8	Check for faulty ECM connections or terminal damages and repair as needed. Is the repair complete?	-	Go to Step 14	Go to Step 9
9	Repair open, short, or grounded signal circuit. Is the repair complete?	-	Go to Step 14	Step 11
10	Remove the HO2S1 and examine it for sign of: Fuel contamination. Improper room temperature vulcanizing sealant (white powdery coating on the sensor) Engine oil/coolant consumption. Are sign of contamination observed?	-	Go to Step 12	Go to Step 13
11	Turn the ignition OFF. Replace the ECM. Is the repair complete?	-	Go to Step 14	Go to Step 13
12	Determine and correct the cause of contamination. Is the repair complete?	-	Go to Step 14	-
13	Replace the HO2S1. Is the repair complete?	-	Go to Step 14	-
14	Using the scan tool, clear the Diagnostic Trouble Codes (DTCs). Start the engine and idle at normal operating temperature. Operate the vehicle within the Conditions for setting this DTC as specified in the supporting text. Does the scan tool indicate that this diagnostic has run and passed?	-	Go to Step 15	Go to Step 2
15	Check if any additional DTCs are set. Are any DTCs displayed that have not been diagnosed?	-	Go to Applicable DTC table	System OK