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Engine Management – V6 – Diagnostics Page 6C1-2–86
DTC P2243 and P2247 The ECM detects the internal HO2S signal voltage is not 0.2 – 4.7 V. DTC P2270 and P2272 When the ECM detects the HO2S 2 is less than 650 mV for 100 seconds, the ECM enriches the fuel mixture up to 30 DTC P2271 and P2273 When the ECM detects the HO2S 2 is greater than 650 mV for 100 seconds, the ECM leans the fuel mixture up to -7 DTC P2297 and P2298 The ECM detects the internal HO2S 1 signal voltage is greater than 3.7 V for longer than 10 seconds. Conditions for Clearing the DTC The HO2S reference circuit DTCs are Type B DTCs. Refer to 1.4 Diagnostic Trouble Codes in this Section, for action Additional Information • Refer to 6C1-1 Engine Management – V6 – General Information for details of the HO2S system operation. • For an intermittent fault condition, refer to 5.2 Intermittent Fault Conditions in this Section. • The HO2S must be tightened correctly. A loose HO2S will trigger these DTCs. • A fault condition in the fuel delivery system, air intake system or exhaust system may 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. DTC P0130 to P0132, P0135 to P0138, P0140, P0141, P0150 to P0152, P0155, P0157, P0158, 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 or 5 Using Tech 2, select the DTC display function. Does DTC P0130, P0131, P0132, P0135, P0137, P0138, P0140, Go to Step 3 Refer to Additional Information in this DTC 3 Are DTCs relating to the heater circuit of the O2 sensor, also set? Go to the appropriate DTC Table in this Section Go to Step 4 |