13
(See
ENGINE CONTROL
SYSTEM OPERATION
INSPECTION [MZI-3.7]
.)
Is the purge control correct?
No
Repair or replace the malfunctioning part.
14
Perform compression inspection.
(See
COMPRESSION
INSPECTION [MZI-3.7]
.)
Is compression correct?
Yes
Visually inspect for deformed exhaust system part.
No
Repair or replace the malfunctioning part.
15
When the engine cannot be
started, inspect the intake-air
system for air leakage.
When the engine can be started,
perform intake manifold vacuum
inspection.
Is air sucked in from intake-air
system?
Yes
Repair or replace the malfunctioning part.
No
Go to the next step.
16
Install the fuel pressure gauge
Between the fuel filter and the fuel
distributor.
Short check connector terminal
F/P to body GND using a jumper
wiring.
Turn the ignition switch to the ON
position (Engine off).
Is fuel line pressure correct with
the ignition switch at ON?
(See
FUEL LINE PRESSURE
INSPECTION [MZI-3.7]
.)
Yes
Inspect the following PIDs:
z
ECT
z
O2S11
z
O2S12
z
O2S21
z
O2S22
z
MAF
(See
PCM INSPECTION [MZI-3.7]
.)
Inspect PCM GND condition.
No
Zero or low:
Inspect the fuel pump relay and fuel pump circuit.
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump
unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7]
.)
High:
Replace the fuel pump unit.
(See
FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7]
.)
z
Verify test results.
{
If normal, return to diagnostic index to service any additional symptoms.
(See
SYMPTOM DIAGNOSTIC INDEX [MZI-3.7]
.)
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 95
© 2005 Mitchell Repair Information Company, LLC.
