Mazda CX-9 Grand Touring 2009 Manual page 1111

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
6
Is the throttle body clogged?
INSPECT ENGINE COMPRESSION
Inspect the engine compression. (See
7
COMPRESSION INSPECTION
[MZI-3.7] .)
Is the engine compression normal?
INSPECT FOR RESTRICTION IN
EXHAUST SYSTEM AND TWC
8
Is there any restriction?
VERIFY TROUBLESHOOTING OF
DTC P050E HAS BEEN COMPLETED
Verify that all disconnected
connectors are reconnected.
Turn the ignition switch to the ON
position (Engine off).
Clear the DTC from the PCM memory
9
using the M-MDS.
Perform the "KOEO and KOER self-
test". (See KOEO/KOER SELF
TEST [MZI-3.7].)
Retrieve DTCs using the M-MDS.
Is the PENDING CODE for this DTC
present?
VERIFY AFTER REPAIR
PROCEDURE
Perform the "AFTER REPAIR
10
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-3.7].)
Are any DTCs present?
DTC P053A [MZI-3.7]
DTC P053A (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P053A
DETECTION
CONDITION
2008 Mazda CX-9 Grand Touring
PCV valve heater control circuit/open
This DTC is set when the PCM detects a PCV valve heater circuit
malfunction.
Open circuit between PCV valve heater control terminal A and main relay
No.1
No Go to the next step.
Yes Go to the next step.
No Overhaul the engine, then go to Step 9.
Replace malfunctioning part, then go to the next
Yes
step.
No Go to the next step.
Replace the PCM, then go to the next step. (See
Yes PCM REMOVAL/INSTALLATION [MZI-
3.7] .)
No Go to the next step.
Go to the applicable DTC inspection. (See DTC
Yes
TABLE [MZI-3.7].)
No Troubleshooting completed.