2010 Cadillac CTS Sedan AWD V6-3.6L Page 1059

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1059

circuit. The HO2S varies the voltage over a range from about 1,000 mV when the exhaust is rich, down through about 10 mV when the exhaust is

lean. The ECM monitors and stores the HO2S voltage information. The ECM evaluates the HO2S voltage samples in order to determine the amount

of time that the HO2S voltage was out of range. Or, to detect if the HO2S signal voltage switches at the same rate at which the ECM is

commanding the heater ON and OFF.

Conditions for Running the DTC

Condition 1 and 2

* Before the ECM can report that DTC P0130 or P0150 failed, DTCs P0030, P0031, P0032, P0050, P0051, P0052, P0133, P0135, P0153, and

P0155 must run and pass.

* DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,

P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The engine is greater than 240 RPM.

* The ignition voltage is greater than 10 volts.

* The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.

* The DTCs run continuously once the conditions above exist for greater than 60 seconds.

Condition 3

* Before the ECM can report that DTC P0130 or P0150 failed, DTCs P0030, P0031, P0032, P0050, P0051, P0052, P0133, P0135, P0153, and

P0155 must run and pass.

* The engine is operating.

* The ignition voltage is greater than 10 volts.

* The air flow into the engine has exceeded 10 grams.

* The HO2S 1 heater duty cycle is greater than 70 percent or, the calculated exhaust gas temperature is warmer than 600掳C (1,112掳F).

* Closed loop fuel control is enabled.

* The evaporative emissions system (EVAP) is not performing an intrusive test.

* The DTCs run continuously once the conditions above exist for greater than 30 seconds.

Conditions for Setting the DTC

Condition 1

The ECM detects that the HO2S 1 signal voltage increases to greater than 2 volts within 4 ms of 4 out of 6 HO2S heater switch OFF samples.

Condition 2

The HO2S 1 voltage is between 520-1,150 mV and the corresponding HO2S 2 voltage is less than 100 mV.

Condition 3

The HO2S 1 voltage is between 60-400 mV and the corresponding HO2S 2 voltage is less than 500 mV.

Action Taken when the DTC Sets

DTCs P0130 and P0150 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0130 and P0150 are Type B DTCs.

Diagnostic Aids

* The HO2S 1 voltage should be between 350-550 mV with the ignition ON. If the voltage is greater than the specified value, there is a

condition with the HO2S 1 circuits. If the voltage does not change after disconnecting the HO2S, the condition is between the sensor and the

ECM. If the voltage is between 350-550 mV after disconnecting the sensor, the condition is with the HO2S 1.

* Inspect the HO2S 1 harness connector for water intrusion. Moisture in a connector may cause voltage to bleed to other circuits within the

connector.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)