rpm less than 15%?
6
LOCATE VACUUM LEAK
z
Locate the vacuum hose joint for
the intake air and PCV systems.
z
Access the PCM and monitor the
SHRTFT1 and SHRTFT2 PIDs.
z
Restrict the vacuum lines one at a
time for 30 s. If a vacuum leak in
the intake is present, the SHRTFT
PID values decrease as the hose is
restricted.
z
Is the decrease in the SHRTFT
PIDs more than 15% when one of
the vacuum hoses is restricted?
CAUTION:
z
Do not clamp or pinch a hard
plastic hose. Use a vacuum cap
or equivalent to restrict the
hose.
NOTE:
z
Restricting the EVAP vapor hose
while the EVAP emission
canister is purging may shift the
SHRTFT. Perform a visual
inspection if necessary.
z
When monitoring for a decrease
in the SHRTFT PIDs in the
following steps, if SHRTFT1
15% and the hose is
restricted, SHRTFT1 decreases
to -7%. The total decrease in the
SHRTFT PIDs equals 22%.
Yes
Repair if necessary. Then go to the next
step.
No
Inspect the intake air system for a vacuum
leak in the intake manifold or intake
gaskets. Repair if necessary. Then go to
the next step.
7
VACUUM LEAK REPAIR
VERIFICATION
NOTE:
z
If the freeze frame ECT PID is
available, stabilize the engine at
the temperature recorded by the
freeze frame ECT PID. If the
freeze frame ECT PID is not
available, maintain the engine
coolant temperature between 82-
Yes
Reset the keep alive memory. Then go to
Step 13.
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 113
© 2005 Mitchell Repair Information Company, LLC.