Question about 2002 Volvo V70
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Posted on Jan 02, 2017
P0058 HO2S Heater Control Circuit High (Bank 2 Sensor 2) HO2S MONITOR
P0064 HO2S Heater Control Circuit High (Bank 2 Sensor 3)
The HO2S sensors must be tested thoroughly because they are at the heart of the Fuel and Catalyst monitors.
The operation of the Emissions control in OBD depends on the sensors being at proper operating temperature. Both the catalysts and the HO2S sensors need to be at several hundred degrees C before they are working efficiently, so the latter have heaters built in to get them up to operating temperature as soon as possible. Because the HO2S sensors need to operate at near stoichometry they cannot be used when rich fuel/air mixtures are needed and so:
For 180 seconds from cold start the system is Open Loop - fuelling is arranged as a function of temperature, (ECT, IAT) and air input (MAF) etc, with no reference to stoichometric (lamda) levels. The engine is in open loop during WOT (Wide Open Throttle). When the engine is in negative torque (ie overrun, engine being driven by transmission) fuel may not be delivered via the INJectors at all. During such periods fuelling is in Open Loop. The HO2S sensors are numbered so that the upstream sensor 1 is always on the Bank which contains Cylinder # One. The down stream sensor is numbered 2. Hence the DOHC engine designs contain the HO2S sensors 11 (forward of the Catalyst) and 12 (downstream of the catalyst).
On the V6 24V the driver's side of the engine contains Cylinder 1, so the configuration is shown here:
Posted on Nov 28, 2010
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