Mazda CX-5 Service & Repair Manual: Heated Oxygen Sensor (HO2 S) Heater Control

Mazda CX-5 Service & Repair Manual / Engine / Control / Heated Oxygen Sensor (HO2 S) Heater Control

Outline

Based on the control of the HO2S heater, a stabilized oxygen concentration is detected even at low exhaust temperatures, and feedback control of fuel injection even at cold engine start is made possible for improved cold temperature exhaust emission performance.
Both emission performance and sensor protection have been improved by duty control of the heater according to engine operation conditions (exhaust gas temperature)

Block Diagram

Operation

The PCM operates the HO2S heater based on the following control conditions.


Output duty ratio	Control condition
0%	Engine stopped Fuel cut injection control is in engine start zone Engine coolant temperature is -10 °C {14 °F}or less Other than battery voltage of 10—16 V Within a fixed period of time after engine start (varies according to engine coolant temperature)
30%	HO2S not activated
0?100% (Determined by engine speed and charging efficiency)	Other than the above

Engine Coolant Temperature (ECT) Sensor

Purpose/Function Detects the ECT as basic information for mainly determining the fuel injection amount. Detects the ECT and inputs it to the PCM as an ECT signal. The ECT sen ...

Heated Oxygen Sensor (HO2 S) Inspection

HO2S Inspection 1. Connect the M-MDS to the DLC?2. 2. Switch the ignition ON (engine on). 3. Warm up the engine to normal operating temperature. 4. Access the following PIDs using the M-MDS.. ...

Other materials:

Condenser Inspection
1. Inspect the condenser for cracks, damage, and oil leakage. If there is any malfunction, replace the condenser. 2. Visually inspect for bent fins for clogging of foreign material. If any fins are clogged, remove the foreign material. 3. Visually inspect for bent fins. ...

Liftgate Adjustment
1. Measure the gap and height difference between the liftgate and the body. 2. Loosen the liftgate hinge installation bolts and adjust the liftgate. Standard clearance a: 5.2?7.2 mm {0.21?0.28 in} b: -2.0?0 mm {-0.078?0.000 in} c: 3.8?6.2 mm {0.15?0.24 in} d: ...

Buckle Switch Inspection
Driver-side 1. Switch the ignition to off. 2. Disconnect the negative battery cable and wait for 1 min or more.. 3. Remove the front seat.. 4. Remove the front buckle.. 5. Inspect for continuity between the buckle switch terminals using a tester. If not as indicated in the tab ...