mazda Workshop Repair Guides

Mazda Workshop Service and Repair Manuals

Component Tests and General Diagnostics|Page 2579 > < Component Tests and General Diagnostics|Page 2577
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If not within the specification, inspect the rear HO2S for an open or short circuit. (See REAR HEATED OXYGEN SENSOR (HO2S)
INSPECTION [LF].) Then if there is no malfunction in the wiring harness, replace the rear HO2S.

Rear HO2S Heater Resistance Inspection

1. Disconnect the rear HO2S connector.

2. Measure the rear HO2S resistance between terminals C and D.

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If not within the specification, replace the rear HO2S.

Rear HO2S heater resistance

2-50 ohms

Rear HO2S Circuit Open/Short Inspection

Component Tests and General Diagnostics|Page 2579 > < Component Tests and General Diagnostics|Page 2577