Mazda CX-7 2007 Workshop Manual page 81

STEP
3 INSPECT HIGH PRESSURE FUEL PUMP
CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the high pressure fuel pump
connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
4 INSPECT SPILL VALVE CONTROL SOLENOID
VALVE CONTROL CIRCUIT FOR SHORT TO
GROUND
• Turn the ignition switch off.
• Inspect for continuity between the following
terminals:
— High pressure fuel pump terminal A (wiring
harness-side) and body ground
— High pressure fuel pump terminal B (wiring
harness-side) and body ground
• Is there continuity?
5 INSPECT SPILL VALVE CONTROL SOLENOID
VALVE
• Inspect the spill valve control solenoid valve.
(See01-14-19 HIGH PRESSURE FUEL
PUMP INSPECTION[L3 WITH TC].)
• Is there any malfunction.
6 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the ignition switch off.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
7 INSPECT SPILL VALVE CONTROL SOLENOID
VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following
terminals:
— High pressure fuel pump terminal A (wiring
harness-side) and PCM terminal 2F (wiring
harness-side)
— High pressure fuel pump terminal B (wiring
harness-side) and PCM terminal 2G (wiring
harness-side)
• Is there continuity?
8 VERIFY TROUBLESHOOTING OF DTC P0091
COMPLETED
• Make sure to reconnect all the disconnected
connectors.
• Clear the DTC from the PCM memory using
the M-MDS.
• Start the engine.
• Is the same DTC present?
9 VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR PROCEDURE".
(See01-02-10 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
Yes Repair or replace the wiring harness for a possible short to
ground, then go to Step 8.
No Go to the next step.
Yes Replace the high pressure fuel pump, then go to Step 8.
(See01-14-16 HIGH PRESSURE FUEL PUMP REMOVAL/
INSTALLATION[L3 WITH TC].)
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 8.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for a possible open
circuit, then go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No DTC troubleshooting completed.
ACTION
01-02–39
01-02