DTC P0231 [MZI-3.7]
DTC P0231 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
8
z
Turn the ignition switch off.
z
Inspect for continuity between fuel pump relay
terminal E and PCM terminal 1V.
z
Is there continuity?
No
Repair or replace suspected part, then
go to Step 10.
9
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.
10
VERIFY TROUBLESHOOTING OF DTC P0230
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-3.7]
.)
z
Is same DTC present?
Yes
Replace the PCM, then go to the next
step.
No
Go to the next step.
11
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 P0231
FP secondary circuit low
DETECTION
CONDITION
z
The PCM monitors the fuel pump monitor circuit. The test fails if the PCM
commands the fuel pump ON and B+ voltage is not detected on the FPM circuit.
POSSIBLE CAUSE
z
Fuel pump relay malfunction
z
Connector or terminal malfunction
z
Open circuit between battery and fuel pump relay terminal C
z
Open circuit between fuel pump relay terminal D and PCM terminal 1Q
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:36 AM
Page 143
© 2005 Mitchell Repair Information Company, LLC.
