Mazda 6 2002 - Mass Air Flow (Maf) Sensor Inspection; Throttle Position (Tp) Sensor Inspection

CONTROL SYSTEM
F51
F
MASS AIR FLOW (MAF) SENSOR INSPECTION
A6E394013210W01
Voltage Inspection
Note
• Perform the following inspection only when directed.
1. Visually inspect for the following on the MAF sensor.
• Damage
• Cracks
• Terminal bends
• Terminal rust
 If any of the above are found, replace the MAF sensor.
 If the MAF PID value is out of specification, carry out the Circuit Open/Short Inspection.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See F43 PCM
REMOVAL/INSTALLATION.)
2. Disconnect the MAF sensor connector.
3. Inspect the following wiring harnesses for open or
short. (Continuity check)
Open circuit
• If there is no continuity, the circuit is open. Repair
or replace the harness.
 MAF sensor terminal A (harness-side) and
main relay terminal C (harness-side)
 MAF sensor terminal B (harness-side) and
PCM terminal 2AC (harness-side)
 MAF sensor terminal C (harness-side) and
PCM terminal 1P (harness-side)
Short circuit
• If there is continuity, the circuit is shorted. Repair or replace the harness.
 MAF sensor terminal A (harness-side) and body GND
 MAF sensor terminal C (harness-side) and power supply
 MAF sensor terminal C (harness-side) and body GND
 MAF sensor terminal B (harness-side) and power supply
End Of Sie
THROTTLE POSITION (TP) SENSOR INSPECTION
A6E394018910W01
Note
• Perform the following inspection only when directed.
Resistance Inspection
1. Perform the following test only when directed.
• If as specified but TP PID value is out of specification, inspect resistance of TP sensor.
• If not as specified, inspect the following:
 Accelerator cable free play (See F16 ACCELERATOR CABLE INSPECTION/ADJUSTMENT.)
2. Disconnect the TP sensor connector.
3. Verify that the resistance between TP sensor
terminals A and B changes smoothly while
opened and closed the throttle valve slowly.
• If not verified, replace TP sensor.
4. Measure the resistance between TP sensor
terminals A and C using an ohmmeter.
• If not as specified, replace the TP sensor.
• If as specified, but TP PID value is out of
specification, perform the Circuit Open/Short
Inspection.
Specification
3.24.8 kilohms
A6E3940W006
A6E3940W007