2. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
3. Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is
cold.
z
If there is a vacuum, inspect the following:
Wiring harness and connectors (Purge solenoid valve-PCM terminal 1BC)
Purge solenoid vale (stuck open)
4. Connect the M-MDS to the DLC-2 and verify that the DTC P0443 is shown. Perform the DTC
inspection. (See
DTC TABLE [MZI-3.7]
.)
5. Select EVAPCP PID.
6. Increase the duty value of the purge valve to
50 %
and inspect if the operation sound of the valve is
heard.
z
If the operation sound is heard, inspect for the loose or damaged vacuum hose. (Intake manifold-
purge solenoid valve-charcoal canister)
z
If the operation sound is not heard, perform the purge solenoid valve inspection.
(See
PURGE SOLENOID VALVE INSPECTION [MZI-3.7]
.)
7. Warm up the engine to normal operating temperature.
8. Monitor the EVAPCP PID using the M-MDS, and drive the vehicle
approx. 2,000 rpm for 30 sec.
or
more.
z
If the EVAPCP PID is
0 %
, inspect the following.
MAF, APP1, APP2, APP3, TP_REL and LOAD PIDs.
If simulation function of the M-MDS is not used:
1. Start the engine.
2. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister.
3. Put the finger to the purge solenoid valve and verify that there is no vacuum applied when the engine is
cold.
z
If there is a vacuum, inspect the following:
Wiring harness and connectors (Purge solenoid valve-PCM terminal 1BC)
Purge solenoid vale (stuck open)
4. Connect the M-MDS to the DLC-2 and verify that the DTC P0443 is shown. Perform the DTC
inspection.
(See
DTC TABLE [MZI-3.7]
.)
5. Access EVAPCP and ECT PIDs.
6. Verify that the ECT PID is
more than 78°C {173°F}.
z
If the ECT PID reading indicates
less than 78°C {173°F}
, perform the ECT inspection.
7. Set the vehicle on the dynamometer or chassis roller.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
Page 110
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