Mazda 6. Manual - part 140
F–82
ON-BOARD DIAGNOSTIC
3
VERIFY CURRENT INPUT SIGNAL STATUS-IS
CONCERN INTERMITTENT OR CONSTANT
• Connect WDS or equivalent to DLC-2.
• Start the engine.
• Access ECT, TP and MAF PIDs.
• Warm up the engine until ECT PID is above 80
°C {176 °F}.
• Drive the vehicle.
• Read MAF PID while TP PID is above 50%.
• Is MAF PID reading below 4.8 g/s {0.63 lb/
min.}?
Yes Make sure that throttle position sensor resistance changes
smoothly while gradually opening throttle valve.
• If not, replace throttle position sensor and go to Step 7.
• For others, go to next step.
No
Go to next step.
4
VERIFY CURRENT INPUT SIGNAL STATUS-IS
CONCERN INTERMITTENT OR CONSTANT
• Connect WDS or equivalent to DLC-2.
• Start the engine.
• Access ECT, MAF and RPM PIDs.
• Warm up engine until ECT PID is above 80°C
{176
°F}.
• Read MAF PID while RPM PID is below 1,000
rpm.
• Is MAF PID reading above 66.5 g/s {8.8 lb/
min.}?
Yes Go to Step 8.
No
Intermittent concern exists. Go to INTERMITTENT
CONCERNS TROUBLESHOOTING procedure.
(See
5
INSPECT POOR CONNECTION OF MAF
SENSOR CONNECTOR
• Turn ignition key to OFF.
• Disconnect MAF/IAT sensor connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
Yes Repair or replace suspected terminal or MAF/IAT sensor,
then go to Step 7.
No
Go to next step.
6
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged/pulled-
out pins, corrosion, etc.).
• Is there any malfunction?
Yes Repair terminal, then go to next step.
No
Replace MAF/IAT sensor, then go to next step.
7
VERIFY TROUBLESHOOTING OF DTC P0101
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition key to ON (Engine OFF).
• Clear DTC from memory using WDS or
equivalent.
• Start the engine.
• Access ECT, TP and RPM PIDs.
• Warm up the engine until ECT PID is reading
above 80
°C {176°F}.
• Drive the vehicle while TP PID above 50% for
50 s.
• Is same DTC present?
Yes Replace PCM, then go to Step 11.
No
Go to Step 11.
8
INSPECT MAF SENSOR TERMINALS FOR
ELECTRICAL CORROSION
• Turn ignition key to OFF.
• Disconnect MAF/IAT sensor connector.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is any problem corrosion found?
Yes Repair or replace suspected terminal or MAF/IAT sensor,
then go to Step 10.
No
Go to next step.
9
INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Disconnect PCM connector.
• Inspect for poor connection (damaged, pulled-
out pins, corrosion, etc.).
• Is there any malfunction?
Yes Repair terminal, then go to next step.
No
Go to next step.
STEP
INSPECTION
ACTION