Mazda 6 Workshop Manual page 69

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 MAF/IAT SENSOR CONNECTOR FOR
POOR CONNECTION
• Turn the engine switch off.
• Disconnect the MAF/IAT sensor connector.
• Inspect for poor connection (such as damaged/
pulled-out pins, corrosion).
• Is there any malfunction?
5 INSPECT MAF SENSOR POWER CIRCUIT FOR
OPEN CIRCUIT
• Turn the engine switch to the ON position
(Engine off).
• Measure the voltage between MAF/IAT sensor
terminal A (wiring harness-side) and body
GND.
• Is the voltage B+?
6 INSPECT MAF SENSOR SIGNAL CIRCUIT FOR
SHORT TO GND
• Turn the engine switch off.
• Inspect for continuity between MAF/IAT sensor
terminal C (wiring harness-side) and body
GND.
• Is there continuity?
7 INSPECT MAF SENSOR
• Inspect the MAF sensor.
• Is there any malfunction?
8 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?
9 INSPECT MAF SENSOR SIGNAL CIRCUIT FOR
OPEN CIRCUIT
• Turn the engine switch off.
• Inspect for continuity between MAF/IAT sensor
terminal C (wiring harness-side) and PCM
terminal 9 (wiring harness-side).
• Is there continuity?
10 VERIFY TROUBLESHOOTING OF DTC P0102
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 10.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness for a possible open
circuit or short to GND, then go to Step 10.
Yes Repair or replace the wiring harness for a possible short to
GND, then go to Step 10.
No Go to the next step.
Yes Replace the MAF/IAT sensor, then go to Step 10.
No Go to the next step.
Yes Repair or replace the terminal, then go to Step 10.
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
F2–57
F2