Mazda CX-9 Grand Touring 2007 Manual page 176

If there is continuity, the circuit is shorted. Repair or replace the harness.
HO2S (RH) terminal A and power supply
HO2S (RH) terminal A and body ground
HO2S (RH) terminal B and power supply
HO2S (RH) terminal B and body ground
HO2S (RH) terminal C and body ground
HO2S (RH) terminal D and power supply
HO2S (LH) terminal A and power supply
HO2S (LH) terminal A and body ground
HO2S (LH) terminal B and power supply
HO2S (LH) terminal B and body ground
HO2S (LH) terminal C and body ground
HO2S (LH) terminal D and power supply
KNOCK SENSOR (KS) REMOVAL/INSTALLATION [MZI-3.5]
NOTE:
Put a tray under the converter housing to receive the engine coolant.
1. Disconnect the negative battery cable.
2. Remove the following part for easier access. Perform the following procedure to remove the intake
manifold
1. Remove the ventilation hose. (see QUICK RELEASE CONNECTOR (EMISSION SYSTEM)
REMOVAL/INSTALLATION [MZI-3.5]. )
2. Remove the vacuum hose (to purge solenoid valve). (see QUICK RELEASE CONNECTOR
(EMISSION SYSTEM) REMOVAL/INSTALLATION [MZI-3.5]. )
3. Remove the fuel hose. (see QUICK RELEASE CONNECTOR (FUEL SYSTEM)
REMOVAL/INSTALLATION [MZI-3.5]. )
4. Remove the fuel distributor. (see FUEL INJECTOR REMOVAL/INSTALLATION [MZI-
3.5] .)
5. Remove the intake manifold. (see INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
[MZI-3.5] .)
3. Remove in the order indicated in the table.
NOTE:
4. Install in the reverse order of removal.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Control System (MZI-3.5) - CX-9
Lubricate the new O-ring with clean engine coolant for installation.