Fig. 27: Output Voltage Graph
Courtesy of MAZDA MOTORS CORP.
z
If not within the specification, inspect the front HO2S for an open or short circuit. (See
FRONT
HEATED OXYGEN SENSOR (HO2S
) Voltage Inspection.) Then if there is no malfunction in
the wiring harness, replace the front HO2S. (See
FRONT HEATED OXYGEN SENSOR
(HO2S
) REMOVAL/INSTALLATION [MZI-3.7].)
HO2S HEATER RESISTANCE INSPECTION
1. Disconnect the HO2S connector.
2. Measure the resistance between HO2S terminals C and A.
z
If it is not within the specification, replace the HO2S. (See
FRONT HEATED OXYGEN
SENSOR (HO2S
) REMOVAL/INSTALLATION [MZI-3.7].)
z
If the monitor item status/specification (reference) is not within the specification, even though the
resistance is within the specification, perform the "Circuit Open/Short Inspection".
HO2S heater resistance
3-30 ohms
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:07:19 AM
Page 30
© 2005 Mitchell Repair Information Company, LLC.