Mazda 6 Workshop Manual page 97

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 repair 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 TEMPERATURE SENSOR
CONNECTOR FOR POOR CONNECTION
• Turn the engine switch off.
• Disconnect the fuel temperature sensor
connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
5 INSPECT FUEL TEMPERATURE SENSOR
SIGNAL CIRCUIT FOR SHORT TO POWER
SUPPLY
• Turn the engine switch to the ON position
(Engine off).
• Measure the voltage between fuel temperature
sensor terminal A (wiring harness-side) and
body GND.
• Is the voltage more than 4.92 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.
• Disconnect the PCM connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
8 INSPECT FUEL TEMPERATURE SENSOR
CIRCUIT FOR OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between the following
terminals:
— Fuel temperature sensor terminal A (wiring
harness-side) and PCM terminal 35 (wiring
harness-side)
— Fuel temperature sensor terminal B (wiring
harness-side) and PCM terminal 91 (wiring
harness-side)
• Is there continuity?
9 VERIFY TROUBLESHOOTING OF DTC P0183
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?
ON-BOARD DIAGNOSTIC
INSPECTION
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
repair 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 terminal, then go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for a possible short to
power supply, then go to Step 9.
No Go to the next step.
Yes Replace the fuel temperature sensor, then go to Step 9.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 9.
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.
No Go to the next step.
ACTION
F2–85
F2