Mazda CX-9 Grand Touring 2007 Manual page 463

2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
for exposed wiring, contamination,
corrosion and correct assembly.
Repair if necessary.
Measure the voltage between
HO2S terminal B and D on the
component side.
Increase the engine speed to 2,000
rpm for 3 min.
Turn the ignition switch to the ON
position (Engine running).
Monitor the signal voltage.
Is the voltage more than 0.5 V at
any time during the engine
running?
12 PERFORM THOROUGH WIGGLE
TEST ON HO2S WIRING HARNESS
Turn the ignition switch off.
Connect the HO2S connector.
Turn the ignition switch to the ON
position (Engine running).
Verify that the engine is at normal
operating temperature.
Access the PCM and monitor the
HO2S signal PID.
Wiggle, shake, and bend small
sections of the wiring harness
while working from the sensor to
the PCM.
While monitoring the HO2S PID,
does the HO2S stop switching?
13 VERIFY TROUBLESHOOTING OF
DTC P0171, P0174 HAS BEEN
COMPLETED
Verify that all disconnected
connectors are reconnected.
Turn the ignition switch to the ON
position (Engine off).
Clear the DTC from the PCM
memory using the M-MDS.
Start the engine and run it at idle.
Retrieve DTCs using the M-MDS.
2007 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Replace the HO2S. Then go to Step 13.
Isolate the concern and repair if necessary.
Then go to the next step.
Go to the next step.
Replace PCM, then go to the next step.
(see PCM
REMOVAL/INSTALLATION [MZI-
3.5] .)
Go to the next step.