S10/T10 P/U 2WD V6-4.3L VIN W (1997)
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DTC P0151 Bank 2 Sensor 1 HO2S.
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DTC P0137 Bank 1 Sensor 2 HO2S.
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DTC P0143 Bank 1 Sensor 3 HO2S.
When the VCM detects an HO2S signal circuit that is high, the VCM will set the following DTCs:
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DTC P0132 Bank 1 Sensor 1 HO2S.
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DTC P0152 Bank 2 Sensor 1 HO2S.
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DTC P0138 Bank 1 Sensor 2 HO2S.
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DTC P0144 Bank 1 Sensor 3 HO2S.
When the VCM detects no HO2S activity, the VCM will set the following DTCs:
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DTC P0134 Bank 1 Sensor 1 HO2S.
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DTC P0154 Bank 2 Sensor 1 HO2S.
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DTC P0140 Bank 1 Sensor 2 HO2S.
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DTC P0146 Bank 1 Sensor 3 HO2S.
A fault in the heated oxygen sensor heater element or its ignition feed or ground will result in an increase in time to Closed Loop fuel control. This
may cause increased emissions, especially at start-up. When the VCM detects a malfunction in the HO2S heater circuits, the following DTCs will
set:
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DTC P0135 Bank 1 Sensor 1 HO2S heater.
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DTC P0155 Bank 2 Sensor 1 HO2S heater.
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DTC P0141 Bank 1 Sensor 2 HO2S heater.
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DTC P0147 Bank 1 Sensor 3 HO2S heater.
The VCM also has the ability to detect HO2S response, switching, transition time, and incorrect ratio voltage problems. If a HO2S response
switching, transition time, or ratio problem is detected, the VCM will store a DTC that indicates degraded HO2S performance.
Diagnose the Fuel Control Heated Oxygen Sensors (Bank 1 HO2S 1 and Bank 2 HO2S 1) are for the following conditions:
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Heater Performance (time to activity on cold start)
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Slow Response
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Response Time (time to switch R/L or L/R)
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Inactive Signal (output steady at bias voltage - approximately 450 mV)
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Signal Fixed High
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Signal Fixed Low
Diagnose the Catalyst Monitor Heated Oxygen Sensors (Bank 1 HO2S 2 and Bank 1 HO2S 3) for the following functions:
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Heater Performance (time to activity on cold start)
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Signal fixed low during steady state conditions or power enrichment (hard acceleration when a rich mixture should be indicated)
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Signal fixed high during steady state conditions or decel fuel mode (deceleration when a lean mixture should be indicated)
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Inactive Sensor (output steady at approximately 438 mV)
Refer to System Diagnosis / Diagnostic Tables for testing information. See: Testing and Inspection
