Mazda 6 Workshop Manual page 103

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related Service Information availability.
• Is any related repair information available?
3 VERIFY CURRENT SIGNAL STATUS: IS
CONCERN INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to the DLC-2.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
4 INSPECT FUEL PRESSURE SENSOR
CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
5 INSPECT FUEL PRESSURE SENSOR SIGNAL
CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the engine switch to the ON position
(Engine off).
• Measure the voltage between fuel pressure
sensor terminal B (wiring harness-side) and
body GND
• Is the voltage more than 4.86 V
6 INSPECT FUEL TEMPERATURE SENSOR
• Inspect the fuel temperature sensor.
• Is there any malfunction?
7 INSPECT PCM CONNECTOR FOR POOR
CONNECTION
• Turn the engine switch off.
• Inspect for poor connection (such as damaged/
pulled-out terminals, corrosion).
• Is there any malfunction?
8 INSPECT FUEL PRESSURE SENSOR FOR
OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between fuel pressure
sensor terminal A and PCM terminal 91.
• Is there continuity?
9 VERIFY TROUBLESHOOTING OF DTC P0193
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory using
the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
10 VERIFY AFTER REPAIR PROCEDURE
• Perform the Repair Verification Drive Mode.
(See F2–39 OBD DRIVE
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC
INSPECTION
MODE.)
Yes Go to the next step.
No Record the FREEZE FRAME DATA on the repair order,
then go to the next step.
Yes Perform repair or diagnosis according to the available
Service Information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Intermittent concern exists.
Perform the "INTERMITTENT CONCERNS
TROUBLESHOOTING".
Yes Repair or replace the suspected terminal, go to Step 9.
No Go to the next step.
Yes Repair or replace harness for short with each other, go to
Step 9.
No Go to the next step.
Yes Repair the supply pump, go to Step 9.
No Go to the next step.
Yes Repair or replace the suspected terminal, go to Step 9.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, go
to the next step.
Yes Replace the PCM, go to the next step.
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
F2–91
F2