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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0140: Bank 1 Heated Oxygen Sensor-2 - No Activity Detected >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Start engine and allow it to reach normal operating temperature of 167-203°F (75-95°C). Apply parking brake and increase engine speed to 1200 RPM or more for 3 minutes. Using scan tool, observe Bank 1 HO2S-2 voltage parameter. If voltage parameter varies above and below 425-475 mV, go to next step. If voltage parameter remains between 425-475 mV, go to step  4 .
  3. Turn engine off. Turn ignition on, engine off. Using scan tool, read and record FAILURE RECORDS data. Operate vehicle within conditions noted in FAILURE RECORDS data. Using scan tool, monitor specified DTC parameters. If scan tool displays DTC P0140 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0140 FAILED THIS IGN, check for intermittent problem. See DIAGNOSTIC AIDS  .
  4. Check for poor or loose terminal connections in Bank 1 HO2S-2 harness connector. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, leave harness connector disconnected and go to next step.
  5. Turn ignition off. Disconnect PCM White 32-pin harness connector. PCM is located under center console in front of shifter. Check for poor or loose terminal connections in PCM harness connector. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, leave harness connector disconnected and go to next step.
  6. Turn ignition off. Using DVOM measure resistance in Orange/Blue wire (HO2S high circuit) and White/Blue wire (HO2S low circuit) between Bank 1 HO2S-2 and PCM. See WIRING DIAGRAMS article. If resistance is .5 ohm or more, repair open circuit or poor connection as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If resistance is less than .5 ohms, connect PCM harness connector and go to next step.
  7. Turn ignition on. Using DVOM, measure voltage between Bank 1 HO2S-2 harness connector terminal No. 3 (Black wire) and terminals No. 1 (White/Blue wire) and then No.2 (Orange/Blue wire). See Figure . Voltage reading should be 3-4 volts at each measurement. If voltage is as specified, go to step  10 . If voltage is not as specified, go to next step.
  8. Check for short to ground or short to voltage in Bank 1 HO2S-2 Orange/Blue wire (HO2S high signal) and White/Blue wire (HO2S low signal) circuits. If problem is found, repair or replace as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM. If no problem is found, go to step  11 .
  9. Connect a jumper wire between Bank 1 HO2S-2 harness connector terminal No. 3 (Black wire) and terminals No. 1 (White/Blue wire) and No.2 (Orange/Blue wire). See Figure . Turn ignition on. Using scan tool, observe Bank 1 HO2S-2 voltage parameter. If voltage parameter is less than 10 mV, go to next step. If voltage parameter is not as specified, go to step  11 .
  10. Replace Bank 1 HO2S-2. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  11. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
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