3.
Ignition "ON" & Engine "ON".
Fig.1) Upstream O2 Sensor and Downstream O2 sensor Signal waveform (Warm-up Condition)
A : Approx. 2500 RPM.
B : Fuel Cut after acceleration.
Ignition "OFF".
Connect VMI to GDS and set up an oscilloscope as follow (4-channel) :
Channel A (+) : Pin No. 3 (V_IP) terminal of Upstream O2 Sensor.
Channel A (-) : Ground
Channel B (+) : Pin No. 1 (Signal) terminal of Downstream O2 Sensor.
Channel B (-) : Ground
Ignition "ON" & Engine "ON".
Fig.1) Upstream O2 Sensor and Downstream O2 sensor Signal waveform (Warm-up Condition)
A : Approx. 2500 RPM.
B : Fuel Cut after acceleration.
Is measured value within specficiation?
 | ▶ Carefully re-do this troubleshooting guide steps. ▶ If the diagnostics have been performed correctly with no failure found, replace the PCM and then go to "Verification of Vehicle Repair" procedure. caution When replacing the PCM, the vehicle equipped with the immobilizer must be performed procedure as below. [In the case of installing used PCM] 1) Perform "PCM Neutral mode" procedure with GDS. (Refer to "Immobilizer" in BE group) 2) After finishing "PCM Neutral mode", perform "Key teaching" procedure with GDS. (Refer to "Immobilizer" in BE group) [In the case of installing new PCM] Perform "Key teaching" procedure with GDS. (Refer to "Immobilizer" in BE group) caution When replacing the PCM, the vehicle equipped with the smart key system (Button start) must be performed procedure as below. [In the case of installing used PCM] 1) Perform "PCM Neutral mode" procedure with GDS. (Refer to "Smart key" in BE group) 2) After finishing "PCM Neutral mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the PCM learns the smart key information automatically. [In the case of installing new PCM] Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the PCM learns the smart key information automatically. |
 | ▶ Carefully re-do this troubleshooting guide steps. ▶ If no problems were found with the circuits or connectors, Replace the Upstream O2 Sensor and then go to "Verification of Vehicle Repair" procedure. caution
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Install the component with the specified torques.
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Note that internal damage may occur when the component is dropped or mis- treated. caution
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DO NOT use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may cause malfunction or affects on sensor performance.
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Sensor and its wiring may be damaged in case of contacting with the exhaust system(Exhaust Manifold, Catalytic Converter, and others). |
