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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0135: Ho2S Heater Performance - Bank 1, Sensor 1 >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
    NOTE: If engine has been operating, allow engine to cool for about 1/2 hour before proceeding with test.
  2. Turn ignition off. Install scan tool. Turn ignition on. Using scan tool, select ENGINE 1 DATA LIST and monitor suspect HO2S voltage parameter. If suspect HO2S voltage changes from bias voltage to less than 300 mV or more than 600 mV, go to INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM. If HO2S voltage does not change from bias voltage to less than 300 mV or more than 700 mV, go to next step.
  3. Check ENG SEN fuse (20-amp) located in bottom underhood fuse block. If fuse is blown, go to step  13. If fuse is okay, go to next step.
  4. Ensure ignition is on. Raise and support vehicle. Disconnect suspect HO2S connector. Connect a test light between ground and suspect HO2S connector terminal "D" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  7.
  5. Connect test light between HO2S connector terminals "C" (Black wire) and "D" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  8.
  6. Allow HO2S to cool for at least 10 minutes. Using DVOM, measure resistance between HO2S connector terminals "C" (Black wire) and "D" (Pink wire). If resistance is 5-10 ohms, go to step  9. If resistance is not 5-10 ohms, go to step  12.
  7. Repair open in Pink wire between suspect HO2S connector terminal "D" and splice S104 located in engine harness approximately 6" from PCM harness breakout. After repairs, go to step  14.
  8. Repair open in Black wire between suspect HO2S connector terminal "C" and splice S108 located in main engine harness approximately 2" from transmission harness breakout (A/T) or approximately 5" from VSS harness breakout (M/T). After repairs, go to step  14.
  9. Check for poor connection at HO2S. If a problem is found, repair as necessary. After repairs, go to step  14. If problem was not found, go to next step.
  10. Check wiring to HO2S terminals "A" (Tan/White wire on Bank 1, Sensor 1; Tan wire on Bank 2, Sensor 1; Gray wire on Bank 1, Sensor 2) and "B" (Purple/White wire on Bank 1, Sensor 1; Purple wire on Bank 2, Sensor 1; Dark Blue wire on Bank 1, Sensor 2) for an open. If problem was found and corrected, go to  14. If no problem was found, go to next step.
  11. Check for poor connection at suspect HO2S connector terminals "A" (Tan/White wire on Bank 1, Sensor 1; Tan wire on Bank 2, Sensor 1; Gray wire on Bank 1, Sensor 2) and "B" (Purple/White wire on Bank 1, Sensor 1; Purple wire on Bank 2, Sensor 1; Dark Blue wire on Bank 1, Sensor 2), and at PCM. Repair as necessary. After repairs, go to step  14. If connections are okay, go to next step.
  12. Replace suspect HO2S. See REMOVAL, OVERHAUL & INSTALLATION - CARS article. After replacing sensor, go to step  14.
  13. Locate and repair short to ground in Pink wire between suspect HO2S and splice S104 located in engine harness approximately 6" (15 cm) from PCM harness breakout. After repairs, replace fuse and go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  15. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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