Mazda CX-9 Grand Touring 2009 Manual page 1007

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Turn the ignition switch off.
Inspect for continuity between fuel pump relay
8
terminal E and PCM terminal 1V.
Is there continuity?
INSPECT FUEL PUMP RELAY
Inspect the fuel pump relay. (See RELAY
9
INSPECTION .)
Is there any malfunction?
VERIFY TROUBLESHOOTING OF DTC P0230
HAS BEEN COMPLETED
Verify that all disconnected connectors
reconnected.
10
Clear DTC from memory using M-MDS.
Start the engine.
Perform the "KOEO/KOER self-test" (See
KOEO/KOER SELF TEST [MZI-3.7].)
Is same DTC present?
VERIFY AFTER REPAIR PROCEDURE
Perform the "AFTER REPAIR PROCEDURE".
11
(See AFTER REPAIR PROCEDURE [MZI-
3.7].)
Are any DTCs present?
DTC P0231 [MZI-3.7]
DTC P0231 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0231 FP secondary circuit low
DETECTION
CONDITION
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
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.
Fuel pump relay malfunction
Connector or terminal malfunction
Open circuit between battery and fuel pump relay terminal C
Open circuit between fuel pump relay terminal D and PCM terminal 1Q
Repair or replace suspected part, then
No
go to Step 10.
Replace the fuel pump relay, then go
Yes
to the next step.
No Go to the next step.
Replace the PCM, then go to the next
Yes
step.
No Go to the next step.
Go to the applicable DTC inspection.
Yes
(See DTC TABLE [MZI-3.7].)
No Troubleshooting completed.