Mazda CX-9 Grand Touring 2009 Manual page 1164

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Disconnect all the PCM connectors.
Visually inspect for:
Pushed out pins
Corrosion
11
Connect all the PCM connectors and
verify that they seat correctly.
Retrieve DTCs using the M-MDS.
Is the PENDING CODE for this
DTC present?
VERIFY TROUBLESHOOTING OF
DTC P0645 HAS BEEN COMPLETED
Verify that all disconnected
connectors reconnected.
Clear the DTC from the PCM
memory using the M-MDS.
12
Perform the "KOEO or KOER self-
test" using the M-MDS. (See
KOEO/KOER SELF TEST [MZI-
3.7].)
Is the PENDING CODE for the DTC
present?
VERIFY AFTER REPAIR
PROCEDURE
Perform the "AFTER REPAIR
13
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-
3.7].)
Are any DTCs present?
DTC P0685 [MZI-3.7]
DTC P0685 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0685 ECM/PCM power relay control circuit/open
DETECTION
CONDITION
POSSIBLE
CAUSE
2008 Mazda CX-9 Grand Touring
This DTC sets when the ignition switch position run circuit indicates the key is in the
off, ACC, or LOCK position, and the amount of time the PCM remains powered
through the PCM power relay exceeds a predetermined amount of time.
Short to ground circuit between main relay No.1 terminal A and PCM terminal 1BM
Main relay No.1 malfunction
PCM malfunction
Yes Go to the next step.
No The system is correctly. 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.