GDI ± Troubleshooting
13A-32
Code No.66 Brake vacuum sensor system Probable cause
Range of check
D Ignition switch: ON
Set conditions
D Sensor output voltage is 4.8 V or more.
or
D Sensor output voltage is 0.2 V or less.
D Malfunction of the brake vacuum sensor
D Improper connector contact, open circuit or
short-circuited harness wire of the brake vacuum
sensor
D Malfunction of the engine-ECU
NG
Repair
NG
Repair
OK
Replace the engine-ECU.
NG
Repair
NG
Repair
Replace the brake vacuum sensor.
OK
OK
Check trouble symptom.
Check the following connectors:
A-56, C-19
OK
NG
Replace the engine-ECU.
OK
NG
Check the harness wire between the
engine-ECU and the brake vacuum
sensor.
OK
Check trouble symptom.
NG
Check the harness wire between the
engine-ECU and the brake vacuum
sensor.
OK
Check the following connector:
A-56
OK
Check trouble symptom.
Measure at the brake vacuum sensor
connector A-56.
D Connect the connector. (Use test
harness MB991348)
D Voltage between 1 and earth
OK: Voltage increases when
depressing the brake pedal
several times after the
warmed engine is turned
off from idle speed and the
ignition switch is turned on.
NG
Measure at the brake vacuum sensor
connector A-56.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 3 and earth
(Ignition switch: ON)
OK: 4.8 ± 5.2 V
D Continuity between 2 and earth
OK: Continuity
NG
Check the following connectors:
A-36, C-18, C-19
Measure at the engine-ECU connector
C-19.
D Connect the connector.
D Voltage between 74 and earth
OK: Voltage increases when
depressing the brake pedal
several times after the
warmed engine is turned
off from idle speed and the
ignition switch is turned on.
Check the harness wire between the
engine-ECU and the brake vacuum
sensor, and repair if necessary.
Repair
NG
NG
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