Mazda CX-9 Grand Touring 2009 Manual page 1012

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
VERIFY RELATED PENDING CODE OR STORED
DTC
3
Verify the related PENDING CODE or stored
DTCs.
Are other DTCs present?
INSPECT FUEL PUMP RELAY CONNECTOR
FOR POOR CONNECTION
Turn the ignition switch off.
4
Disconnect the fuel pump relay.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there malfunction?
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
Turn the ignition switch off.
5
Disconnect PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there malfunction?
INSPECT FUEL PUMP MONITOR CIRCUIT FOR
SHORT TO POWER SUPPLY
Turn the ignition switch to the ON position
(Engine off).
Measure voltage between the following terminals:
6
Fuel pump relay terminal D (wiring harness-
side) and body ground
fuel pump terminal B (wiring harness-side)
and body ground
Is voltage B+?
INSPECT FUEL PUMP MONITOR CIRCUIT FOR
OPEN CIRCUIT
Turn the ignition switch off.
7
Inspect continuity between fuel pump terminal B
(wiring harness-side) and PCM terminal 1Q
(wiring harness-side).
Is there continuity?
2008 Mazda CX-9 Grand Touring
No Go to the next step.
Go to appropriate DTC inspection.
Yes
(See DTC TABLE [MZI-3.7].)
No Go to the next step.
Repair or replace suspected part,
Yes
then go to Step 10.
No Go to the next step.
Repair or replace suspected part,
Yes
then go to Step 10.
No Go to the next step.
Repair or replace suspected part,
Yes
then go to Step 10.
No Go to the next step.
Yes Go to the next step.
Repair or replace suspected part,
No
then go to Step 10.