Inspection Procedure

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Start engine and hold the engine at 3000 rpm with no load (in P or N) until the cooling fan comes on.

Does scan tool display DTC P0136?

1. Yes:  Go to next step.
2. No: Problem is intermittent or was repaired and ECM memory was not cleared. See INTERMITTENT PROBLEM INSPECTION PROCEDURE ..

1. Turn ignition switch to OFF position, and then disconnect HO2S and ECM connector.
2. Measure resistance between terminal 1 of the HO2S harness connector and terminal 37 of the ECM harness connector.
3. Measure resistance between terminal 2 of the HO2S harness connector and terminal 42 of the ECM harness connector.

   Specification (HO2S resistance): below 1Ω

Does each resistance indicate continuity?

Fig 1: Checking For Open In Harness

Courtesy of KIA MOTORS AMERICA, INC.

1. Yes:  Go to next step.
2. No: Repair open in harness.

1. Reconnect the HO2S and ECM connectors.
2. Warm up the engine to normal operating temperature.
3. Using a Hi-Scan (Pro), monitor the HO2S signal waveform.
   NOTE:

   • 0.0V at Fuel-Cut state after racing with no load
   • 0.1 ~ 0.8V at idle.

Do the rear HO2S signals fluctuate between 0V and 1V?

1. Yes:  Proceed with ECM PROBLEM INSPECTION PROCEDURE .
2. No: Replace HO2S.