z
Increase the engine speed to 2,000
rpm for 3 min.
z
Turn the ignition switch to the ON
position (Engine running).
z
Monitor the signal voltage.
z
Is the voltage more than 0.5 V at
any time during the engine
running?
8
PERFORM THOROUGH WIGGLE
TEST ON HO2S WIRING HARNESS
z
Turn the ignition switch off.
z
Connect the HO2S connector.
z
Turn the ignition switch to the ON
position (Engine running).
z
Verify that the engine is at normal
operating temperature.
z
Access the PCM and monitor the
HO2S signal PID.
z
Wiggle, shake, and bend small
sections of the wiring harness
while working from the sensor to
the PCM.
z
While monitoring the HO2S PID,
does the HO2S stop switching?
Yes
Isolate the concern and repair if necessary.
Then go to the next step.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF
DTC P0172, P0175 HAS BEEN
COMPLETED
z
Verify that all disconnected
connectors are reconnected.
z
Turn the ignition switch to the ON
position (Engine off).
z
Clear the DTC from the PCM
memory using the M-MDS.
z
Start the engine and run it at idle.
z
Retrieve DTCs using the M-MDS.
z
Is the PENDING CODE for this
DTC present?
Yes
Replace the PCM, then go to the next step.
(see
PCM
REMOVAL/INSTALLATION [MZI-
3.5]
.)
No
Go to the next step.
10
VERIFY AFTER REPAIR
PROCEDURE
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:30 AM
Page 120
© 2005 Mitchell Repair Information Company, LLC.