position (Engine off).
z
Measure voltage between fuel pump
relay connector terminal C (wiring
harness-side) and body ground.
z
Is voltage
B+
?
to Step 9.
7
INSPECT FUEL PUMP MONITOR
CIRCUIT FOR OPEN CIRCUIT
z
Turn the ignition switch off.
z
Inspect continuity between fuel
pump relay terminal D (wiring
harness-side) and PCM terminal 1Q
(wiring harness-side).
z
Is there continuity?
Yes
Go to the next step.
No
Repair or replace suspected part, then go
to Step 9.
8
INSPECT FUEL PUMP RELAY
z
Inspect the fuel pump relay.
(see
RELAY INSPECTION
.)
z
Is there any malfunction?
Yes
Replace the fuel pump relay, then go to
the next step.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF
DTC P0231 HAS BEEN COMPLETED
z
Verify that all disconnected
connectors reconnected.
z
Clear DTC from memory using M-
MDS.
z
Start the engine.
z
Perform the "KOEO/KOER self-
test"
(See
KOEO/KOER SELF TEST
[MZI-3.5]
.)
z
Is same DTC present?
Yes
Replace the PCM, then go to the next
step.
No
Go to the next step.
10
VERIFY AFTER REPAIR
PROCEDURE
z
Perform the "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
No
Troubleshooting completed.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:31 AM
Page 153
© 2005 Mitchell Repair Information Company, LLC.