Component Inspection

Engine Control
P2251 O2 Sensor Reference Ground Circuit/Open (Bank 1 Sensor 1) - Inspection/Repair:_:Component Inspection

Component Inspection

Visual Check
1. IG KEY "OFF".
2. Disconnect HO2S(S1) connector.
3. Check that HO2S(S1) is contaminated or damaged by foreign materials.
4. Has a problem been found ?





Check HO2S(S1) performance
1. IG KEY "OFF".
2. Connect probe to signal terminal of HO2S(S1) connector and select oscilloscope function with GDS.
3. Warm up the engine to normal operating temperature.
4. Measure signal waveform of HO2S(S1) with GDS.

Specification :Refer to Signal Waveform & Data




5. Is the measured signal waveform within specification ?