Mazda 3 Workshop Manual page 271

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Is any related repair information
available?
VERIFY CURRENT INPUT SIGNAL
STATUS: IS CONCERN
INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to DLC-
2.
• Start the engine.
• Access ECT, TP and MAF PIDs.
3
• Warm up the engine until ECT PID
is above 80 °C {176 °F}.
• Drive the vehicle.
• Read MAF PID when the TP PID
is above 50%.
• Is MAF PID below 5.0 g/s {0.66
lb/min}?
VERIFY CURRENT INPUT SIGNAL
STATUS: IS CONCERN
INTERMITTENT OR CONSTANT?
• Connect the WDS or equivalent to DLC-
2.
• Start the engine.
• Access ECT, MAF and RPM PIDs.
4
• Warm up the engine until ECT PID
is above 80°C {176 °F}.
• Read MAF PID when the RPM PID
is below 2,000 rpm.
• Is MAF PID above 96.0 g/s {12.7
lb/min}?
INSPECT POOR CONNECTION OF
MAF SENSOR CONNECTOR
• Turn the ignition switch off.
• Disconnect MAF/IAT sensor connector.
5
• Inspect for poor connection (such as
damaged/pulled-out pins, corrosion.)
• Is there any malfunction?
INSPECT POOR CONNECTION OF
PCM CONNECTOR
6
• Disconnect the PCM connector.
Downloaded from
Yes
No Go to the next step.
Yes Go to Step 8.
No
Yes
No Go to the next step.
Yes Repair the terminal, then go to the next step.
No
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Make sure that the throttle position sensor
resistance changes smoothly while gradually
opening the throttle valve.
• If not, replace the throttle position sensor and
go to Step 7.
• For others, go to the next step.
Intermittent concern exists. Go to
INTERMITTENT CONCERNS
TROUBLESHOOTING procedure.
(See INTERMITTENT CONCERN
TROUBLESHOOTING [LF].)
Repair or replace the terminal or the MAF/IAT
sensor, then go to Step 7.
Replace MAF/IAT sensor, then go to the next
step.
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