Code No. 14 (Atmospheric Pressure Sensor) - Mazda 626 MX-6 Workshop Manual

4 A
TROUBLESHOOTING WITH SST

Code No. 14 (Atmospheric pressure sensor)

Are there poor connections in atmospheric pressure
sensor circuit?
Is there Vref at (LgR) wire of atmospheric pressure
sensor connector?
Vref: 4.5-5.5V
YES
Is voltage at (Y) wire of atmospheric pressure sensor
connector OK?
Voltage: 3.5—4.5V....at sea level
2.5—3.5V....at high altitude
(2,000 m (6,500 ft))
YES
Is there continuity between atmospheric pressure
sensor to engine control unit?
Atmospheric pressure sensor
A (LgY wire)
D (Y wire)
YES
Is same Code No. present after performing after­
repair procedure? (Refer to page 4A—11)
YES
Are engine control unit 2C and 2H terminal voltages
OK? (Refer to page 4A—91)
^
NO
NO
NO
(0V)
NO
(Other)
NO
Control unit
2C
2H
NO
NO
YES
Repair or replace connector
PC: Open or short circuit in wiring harness from
(LgR) wire to engine control unit
• Engine control unit malfunction
(If 2A terminal voltage not 4.5—5.5V)
PC: Short circuit in wiring harness from atmospheric
pressure sensor (Y) wire to engine control unit
2H terminal
Replace atmospheric pressure sensor
PC: Open circuit in wiring harness from atmospheric
pressure sensor to engine control unit
Atmospheric pressure sensor and circuit OK
PC: Short circuit in wiring harness
PC: Engine control unit malfunction
PC: Possible cause
86U04A-026