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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Engine Controls - Self-Diagnostics - 3.0L) >> Diagnostic Tests >> DTC P0140: Ho2S Circuit - Insufficient Activity - Bank 1, Sensor 2 >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTC P0036, P0037 or P0038 is also set, diagnose that DTC first. See DTC P0036: HO2S HEATER CIRCUIT - BANK 1, SENSOR 2  , DTC P0037: HO2S HEATER CIRCUIT - LOW VOLTAGE - BANK 1, SENSOR 2  or DTC P0038: HO2S HEATER CIRCUIT - HIGH VOLTAGE - BANK 1, SENSOR 2  .
  1. Run engine for 2 minutes above 2500 RPM. Ensure ECT is more than 176°F (80°C). Let engine idle. Using scan tool, monitor HO2S bank 1 sensor 2. If reading is varying outside 401-519 mV, problem is intermittent; See DIAGNOSTIC AIDS  . If reading is not varying outside 401-519 mV, go to next step.
  2. Turn ignition on, engine off. Disconnect HO2S bank 1 sensor 2. Connect jumper between HO2S connector terminals No. 3 (Tan/White wire) and No. 4 (Purple/White wire). If reading is less than 40 mV, check HO2S connector. If connector is okay, replace HO2S bank 1 sensor 2. If reading is not less than 40 mV, go to next step.
  3. Remove jumper. Connect jumper between HO2S connector terminal No. 4 (Purple/White wire) and ground. If reading is less than 40 mV, check Tan/White wire between HO2S and ECM for open. If wire is okay, replace ECM. If reading is not less than 40 mV, check Purple/White wire between HO2S and ECM for open. If wire is okay, replace ECM.
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