GDI ± Troubleshooting
13A-69
INSPECTION PROCEDURE 31
Power steering fluid pressure switch system
Probable cause
The power steering fluid pressure switch sends a signal to the engine-ECU according
to power steering load.
Based on this signal, the engine-ECU controls the throttle control servo so that
idle speed increases when the power steering is in operation.
D Malfunction of the power steering fluid pressure switch
D Open circuit or short-circuited harness wire in the
power steering fluid pressure switch circuit, or poor
connector contact
D Malfunction of the engine-ECU
NG
NG
Repair
OK
Replace the engine-ECU.
NG
Repair
Check the power steering fluid pressure switch. (Refer to GROUP
37A ± On-vehicle Service.)
NG
Replace
OK
Measure at power steering fluid pressure switch connector A-76.
D Disconnect the connector, and measure at the harness side.
D Voltage between terminal 1 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the following connector: C-18
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and power steer-
ing fluid pressure switch.
NG
Repair
OK
OK
Check the following connector: A-76
Check trouble symptom.
NG
INSPECTION PROCEDURE 32
A/C switch and A/C relay system
Probable cause
If the engine-ECU receives a `A/C on' signal, it operates the throttle control servo
and A/C compressor magnetic clutch so that idle speed increases.
D Malfunction of the A/C control system
D Malfunction of the A/C switch
D Open circuit or short-circuited harness wire in the
A/C switch circuit, or poor connector contact
D Malfunction of the engine-ECU
NG
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Service the A/C compressor relay. (Refer to GROUP 55 ± On-ve-
hicle Service.)
NG
Replace
OK
Measure at engine-ECU connectors C-17, C-19.
D Disconnect the connector, and measure at the harness side.
D Voltage between terminals 20, 83 and earth
(Ignition switch: ON)
OK: 0 ± 3 V
(A/C switch: OFF)
System voltage
(A/C switch: ON)
D Connect terminal 20 to earth.
(Ignition switch: ON, A/C switch: ON)
OK: A/C compressor clutch turns on.
OK
Check the following connectors: C-17, C-19
Check the A/C system. (Refer to GROUP 55 ± On-vehicle Service.)
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