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Engine Management – V6 – Diagnostics Page 6C1-2–66
• The HO2S must be tightened correctly. A loose HO2S will trigger these DTCs. • Since fault condition in a wiring connector may trigger DTCs, always test the connectors related to this diagnostic • To assist diagnosis, refer to 3 Wiring Diagrams and Connector Charts in this Section, for the system wiring diagram and connector charts. Conditions for Running the DTC Run continuously once the following conditions are met: • The ignition voltage is 10.0 – 16.0 V. • The engine is running. • The O2 Sensors are in closed loop. • The ECM is commanding the HO2Ss fuel trim. Conditions for Setting the DTC The ECM detects the HO2S signal voltages are heading in the opposite direction of what was commanded. Conditions for Clearing the DTC The HO2S signal not plausible DTCs are Type B DTCs. Refer to 1.4 Diagnostic Trouble Codes in this Section, for action taken when Type B DTC sets and conditions for clearing Type B DTCs. DTC P0040 and P0041 Diagnostic Table Step Action Yes No 1 Has the Diagnostic System Check been performed? Go to Step 2 Refer to 4.4 Diagnostic System Check in this Section 2 1 Switch off the ignition for 30 seconds. 2 Start the engine. 3 Allow the engine to reach the normal operating temperature. 4 Increase the engine speed to 2,000 rpm for 10 seconds. 5 Using Tech 2, select the DTC display function. Does P0040 or P0041 fail this ignition cycle? Go to Step 3 Refer to Additional Information in this DTC 3 Check the HO2S 2 wiring connectors for a swapped connector fault Was any fault found and rectified? Go to Step 5 Go to Step 4 4 Are DTCs relating to other circuits of the HO2S also set? Go to the appropriate DTC in this Section Refer to Additional Information in this DTC 5 1 Using Tech 2, clear the DTCs. 2 Switch off the ignition for 30 seconds. 3 Start the engine. 4 Operate the vehicle within the conditions for running the DTC. Does any of the HO2S signal not plausible or wire connector swapped Go to Step 2 Go to Step 6 |