GDI ± Troubleshooting
13A-67
INSPECTION PROCEDURE 29
EGR valve system
Probable cause
The engine-ECU controls the EGR valve in order to control the amount of
exhaust gas mixed in the intake air.
D Malfunction of the EGR valve
D Open circuit or short-circuited harness wire in the
EGR valve circuit
D Malfunction of the engine-ECU
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and EGR valve, and repair
if necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
OK
Check the following connector:
C-17
NG
Repair
OK
Measure at the engine-ECU connector
C-17.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 5, 6, 32, 34
and earth (Ignition switch: ON)
OK: System voltage
NG
Check the following connectors:
A-60, A-82
NG
Repair
OK
Measure at the EGR valve connector
A-60.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 2, 5 and earth
(Ignition switch: ON)
OK: System voltage
NG
Check the EGR valve. (Refer to
GROUP 17 ± Emission Control Sys-
tem.)
NG
Replace
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine control relay and the EGR valve,
and repair if necessary.
Check the following connectors:
A-36, A-82
NG
Repair
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