DTC P0645 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
z
Has FREEZE FRAME DATA been
recorded?
Yes Go to the next step.
No
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
and/or on-line repair information
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to the
available Service Bulletins.
z
If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
INSPECT THAT THE ACCS PID IS
OFF
z
Turn ignition key to ON (Engine
running).
z
A/C switch and defroster switch off.
z
Access the ACCS PID uesing M-
MDS.
z
Is the PID state off?
Yes Go to the next step.
No
ACCS input to PCM is requesting A/C. Inspect
A/C system operation, then go to Step 12.
(See
DIAGNOSTIC TROUBLE CODE
NUMBER INSPECTION
.)
(See
TROUBLESHOOTING INDEX
.)
4
INSPECT A/C RELAY CONNECTOR
FOR POOR CONNECTOR
z
Turn the ignition switch off.
z
Disconnect the A/C relay connector.
z
Inspect for poor connection (such as
damaged, pulled-out pins, corrosion,
etc.).
z
Are there any malfunction?
Yes Repair or replace suspected part, then go to Step
12.
No
Go to the next step.
5
INSPECT A/C RELAY POWER
SUPPLY CIRCUIT FOR OPEN
CIRCUIT
z
Turn the ignition switch to the ON
position (Engine off).
z
Measure voltage between A/C relay
terminal A (wiring harness-side) and
body ground.
z
Is voltage B+?
Yes Go to the next step.
No
Repair or replace suspected part, then go to Step
12.
INSPECT A/C RELAY CONTROL
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 298
© 2005 Mitchell Repair Information Company, LLC.
