GDI ± Troubleshooting
13A-23
Code No.25 Barometric pressure sensor system Probable cause
Range of check
D After 60 seconds have passed since the engine have started
D Battery voltage is 8 V or more.
Set conditions
D Sensor output voltage is 0.2 V or less for 4 seconds. (This condition
corresponds to that the barometric pressure is 53 kPa or less.)
or
D Sensor output voltage is 4.5 V or more for 4 seconds. (This condition
corresponds to that the barometric pressure is 114 kPa or more.)
D Malfunction of the barometric pressure sensor
D Open circuit or short-circuited harness wire of the
barometric pressure sensor
D Malfunction of the engine-ECU
NG
Repair
NG
Repair
OK
Replace the engine-ECU.
NG
Repair
NG
Repair
OK
Replace the air flow sensor.
OK
NG
Repair
OK
Check the following connectors:
A-71, C-18
OK
Check trouble symptom.
NG
Replace the engine-ECU.
OK
Measure at the engine-ECU connector
C-18.
D Connect the connector.
D Voltage between 51 and earth
(Ignition switch: ON)
OK: 3.7 ± 4.3 V
(at altitude of 0 m)
3.2 ± 3.8 V
(at altitude of 1,200 m)
NG
Check the harness wire between the
engine-ECU and the barometric pres-
sure sensor, and repair if necessary.
NG
Check the harness wire between the
engine-ECU and the barometric pres-
sure sensor.
OK
Check trouble symptom.
OK
Check the following connector:
A-71
NG
Check the harness wire between the
engine-ECU and the barometric pres-
sure sensor.
OK
Check trouble symptom.
Measure at the air flow sensor connec-
tor A-71.
D Connect the connector. (Use test
harness MB991709)
D Voltage between 2 and earth
(Ignition switch: ON)
OK: 3.7 ± 4.3 V
(at altitude of 0 m)
3.2 ± 3.8 V
(at altitude of 1,200 m)
NG
Measure at the air flow sensor connec-
tor A-71.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between 1 and earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V
(2) Continuity between 5 and earth
OK: Continuity
NG
Check the following connectors:
A-36, C-18, C-19
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