DTC P0685 [MZI-3.7]
DTC P0685 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
11
z
Disconnect all the PCM connectors.
z
Visually inspect for:
{
Pushed out pins
{
Corrosion
z
Connect all the PCM connectors and
verify that they seat correctly.
z
Retrieve DTCs using the M-MDS.
z
Is the PENDING CODE for this
DTC present?
Yes Go to the next step.
No
The system is correctly. Go to the next step.
12
VERIFY TROUBLESHOOTING OF
DTC P0645 HAS BEEN COMPLETED
z
Verify that all disconnected
connectors reconnected.
z
Clear the DTC from the PCM
memory using the M-MDS.
z
Perform the "KOEO or KOER self-
test" using the M-MDS. (See
KOEO/KOER SELF TEST [MZI-
3.7]
.)
z
Is the PENDING CODE for the DTC
present?
Yes
Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7]
.)
No
Go to the next step.
13
VERIFY AFTER REPAIR
PROCEDURE
z
Perform the "AFTER REPAIR
PROCEDURE". (See
AFTER
REPAIR PROCEDURE [MZI-
3.7]
.)
z
Are any DTCs present?
Yes
Go to the applicable DTC inspection. (See
DTC
TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P0685
ECM/PCM power relay control circuit/open
DETECTION
CONDITION
z
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.
POSSIBLE
CAUSE
z
Short to ground circuit between main relay No.1 terminal A and PCM terminal 1BM
z
Main relay No.1 malfunction
z
PCM malfunction
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:40 AM
Page 300
© 2005 Mitchell Repair Information Company, LLC.
