Mazda 6 Workshop Manual page 205

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 Bulletins and/or on-line
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 IDM 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 IDM FOR SHORT TO GND
• Turn the engine switch off.
• Inspect continuity between IDM terminal 1D
and body GND.
• Is there continuity?
6 INSPECT IDM FOR SHORT TO POWER
• Turn the engine switch off.
• Inspect the voltage between IDM terminal 1D
and body GND.
• Is the voltage B+?
7 INSPECT FOR OPEN CIRCUIT BETWEEN IDM
AND FUEL INJECTOR NO.1/NO.4
• Turn the engine switch off.
• Inspect continuity between following wiring
harnesses.
— IDM terminal 1D and fuel injector No.1
terminal D
— IDM terminal 1D and fuel injector No.4
terminal D
• Is there continuity?
8 INSPECT IDM
• Inspect the IDM.
• Is there any malfunction?
9 VERIFY TROUBLESHOOTING OF DTC P2146
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC 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
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 suspected terminal, then go to Step
9.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to GND,
then go to Step 9.
No Go to the next step.
Yes Repair or replace the wiring harness for a short to power,
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 an open circuit,
then go to Step 9.
Yes Replace the IDM, then go to step 9.
No Go to the next step.
Yes Replace the PCM, then go to the next step.
No Go to the next step.
Yes Go to the applicable DTC troubleshooting.
(See F2–40 DTC TABLE.)
No Troubleshooting completed.
ACTION
F2–193
F2