5
z
Turn the ignition switch to the ON position
(Engine running)
z
Access the PCM and monitor the ECT, CHT
and IAT PIDs.
z
Access the PCM and monitor the LONGFT1,
SHRTFT1, LONGFT2 and SHRTFT2 PIDs.
z
Allow the engine to stabilize at the
temperature necessary to recreate the
concern.
z
Add and record the LONGFT PID value to
the SHRTFT PID value for each bank,
correction at idle.
z
Increase the engine speed to 2,500 rpm for 10
s. Record the LONGFT1, SHRTFT1,
LONGFT2, and system SHRTFT2 PID
values.
z
Add and record the LONGFT PID value to
the SHRTFT PID value for each bank,
correction at 2,500 rpm.
z
Is the total fuel correction value difference
between idle and 2,500 rpm less than 15%?
small portion of the total air flow
z
When calculating the total fuel correction
in the following steps, if LONGFT1 equals
+13% and SHRTFT1 23%, the total
fuel correction for bank 1 36%. If
LONGFT2 24% and SHRTFT2
equals -3% the total fuel correction for
bank 2 21%.
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 82-101°C {180-215°F} and the
intake air temperature at less than 46°C
{115°F}.
No
Go to the next step.
LOCATE VACUUM LEAK
CAUTION:
z
Do not clamp or pinch a hard plastic hose.
Use a vacuum cap or equivalent to restrict
the hose.
Yes
Repair if necessary. Then go to the next
step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 108
© 2005 Mitchell Repair Information Company, LLC.
