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Home >> Kia >> 2003 >> Spectra Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0136, DTC P0137, DTC P0138 &/Or DTC P0140 >> Test Procedure

Test Procedure

  1. Turn ignition off. Connect Hi-Scan Pro/Kia Data Pro Scan tool or equivalent to OBD-II Data Link Connector. See Figure . Turn ignition on. Monitor for other DTCs. If other DTCs are set, do all repairs associated with those DTCs before continuing with this procedure. If no other DTCs are set, go to next step.
  2. Start engine. Allow engine to idle until reaches normal operating temperature for more than 10 minutes. Using Hi-Scan Pro/Kia Data Pro Scan tool, monitor rear HO2S voltage signal waveform. See Figure . If rear HO2S voltage signal switches from lean to rich or rich to lean over 6 times for 10 seconds. Problem is intermittent, check rear HO2S and ECM for proper harness connections and go to step  8 . If voltage signal waveform is not as specified, go to next step.
  3. Turn ignition off. Disconnect rear HO2S 4-pin harness connector. See Figure and ECM 81-pin harness connector. See Figure . Measure resistance between rear HO2S connector terminal No. 4 (Green/White wire) and ECM connector terminal No. 55. Also measure resistance between rear HO2S connector terminal No. 2 (Violet/White wire) and ECM connector terminal No. 35. Both resistances should be below one ohm. If resistances are as specified, go to next step. If any resistance is not as specified, repair open or short circuit as necessary and go to step  8 .
  4. With rear HO2S and ECM harness connector disconnected. Measure voltage between ground and rear HO2S connector terminal No. 4 (Green/White wire). Voltage should be below 0.5 volt. If voltage is specified, go to next step. If voltage is not as specified, repair open or short circuit as necessary and go to step  8 .
  5. With rear HO2S and ECM harness connector disconnected. Measure resistance between ground and rear HO2S connector terminal No. 4 (Green/White wire). Also measure resistance between rear HO2S connector terminal No. 2 (Violet/White wire) and No. 4 (Green/White wire). Both resistances should be infinite. If resistances are as specified, go to next step. If any resistance is not as specified, repair short circuit as necessary and go to step  8 .
  6. Remove rear HO2S from vehicle, check rear HO2S for contamination, deterioration or damage. If rear HO2S is contaminated, deteriorated or damage, replace rear HO2S and go to next step. If rear HO2S seems okay, temporarily install a known good rear HO2S and check for proper operation. If problem is corrected, replace rear HO2S and go to step  8 .
  7. Return vehicle to original condition. Start engine. Thoroughly check exhaust system for leaks (specially between Warm-up Catalytic Converter and front exhaust pipe). If exhaust leak is found, repair as necessary and go to next step. If exhaust leak is not found, go to next step.
  8. After repair, return vehicle to original condition. Clear codes using Hi-Scan Pro/Kia Data Pro Scan tool or equivalent. Verify repairs by driving vehicle and monitoring for pending codes. If DTC is set during test drive, follow appropriate DTC test procedure.
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