Page 1 of 5 P013A-O2 SENSOR 1/2 SLOW RESPONSE - RICH TO LEAN
Page 2 of 5 For a complete wiring diagram Refer to the Wiring Information.
Page 3 of 5 When Monitored: With the engine running, VSS above 96 kph (60 mph), throttle open for a minimum of 120 seconds, ECT above 70 C (158 F), CAT temp above 600 C (1112 F), and DS O2 sensor in a rich state. During a decel fuel shutoff event, the DS O2 sensor should switch from rich to lean within a specific time. Set Condition: The Powertrain Control Module (PCM) detects that the downstream O2 sensor does not switch from rich to lean within a specific time during a decel fuel shutoff event. One trip fault. Three good trips to turn off the MIL. EXHAUST SYSTEM LEAKS OXYGEN SENSOR WIRING OR CONNECTORS O2 SENSOR SIGNAL CIRCUIT O2 SENSOR RETURN CIRCUIT 1/2 OXYGEN SENSOR POWERTRAIN CONTROL MODULE (PCM) Possible Causes Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC- Based Diagnostics/MODULE, Powertrain 1. DTC IS ACTIVE NOTE: If an O2 sensor signal circuit is shorted to voltage, all O2 sensor voltage readings displayed on the scan tool will be approximately 5.0 volts. Diagnose the sensor that set the most current DTC. NOTE: After repairs have been completed, verify proper O2 Sensor operation. If all O2 Sensor voltage readings have not returned to normal, perform the diagnostic procedure for the remaining O2 Sensors. 1. Start the engine and allow it to reach operating temperature. WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. NOTE: It may be necessary to test drive the vehicle within the DTC monitoring conditions in order for this DTC to set. 2. With a scan tool, select View DTCs. Is the status Active for this DTC?
Page 4 of 5 Go To 2 Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain 2. CHECKING THE EXHAUST SYSTEM FOR LEAKS 1. Perform the diagnostic procedure for CHECKING THE EXHAUST SYSTEM FOR LEAKS. (Refer to 29 - n- DTC Diagnostics/Drivability - Gas - Diagnosis and Testing). Repair as necessary and retest. Go To 3 3. CHECKING THE OXYGEN SENSOR OPERATION NOTE: Check for signs of contaminants that may have damaged the O2 Sensor, such as contaminated fuel, unapproved silicone, oil and coolant. 1. Perform the diagnostic procedure for CHECKING THE OXYGEN SENSOR OPERATION. (Refer to 29 - n- DTC Diagnostics/Drivability - Gas - Diagnosis and Testing). Repair as necessary. Go To 4
Page 5 of 5 4. POWERTRAIN CONTROL MODULE (PCM) 1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the 1/2 Oxygen Sensor and the Powertrain Control Module (PCM). 2. Look for any chafed, pierced, pinched, or partially broken wires. 3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors. 4. Refer to any Technical Service Bulletins that may apply. Repair as necessary. Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.