GDI ± Troubleshooting
13A-62
INSPECTION PROCEDURE 23
Engine-ECU power supply and earth circuit system
Probable cause
The cause is probably a malfunction of the engine-ECU or one of the problems
listed at right.
D Open circuit or short-circuited harness wire in the
engine-ECU power supply circuit
D Open circuit or short-circuited harness wire in the
engine-ECU earth circuit
D Malfunction of the engine-ECU
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54.)
(2),(3) NG
Check the harness wire between the
engine-ECU and engine control relay,
and repair if necessary.
(4) NG
Check the harness wire between the
engine-ECU and earth, and repair if
necessary.
(5) NG
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and the battery, and repair
if necessary.
NG
Repair
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connectors:
B-18, C-19
Check the following connector:
A-36
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-ECU and ignition switch, and
repair if necessary.
Measure at the engine-ECU connectors
C-18, C-19.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between 99 and earth
(Ignition switch: ON)
OK: System voltage
(2) Voltage between 57 and earth
OK: System voltage
(3) Voltage between 47, 59 and
earth (Ignition switch: ON)
OK: System voltage (When ter-
minal 57 is shorted to
earth)
(4) Continuity between 46, 58 and
earth
OK: Continuity
(5) Voltage between 60 and earth
OK: System voltage
(1) NG
Check the following connectors:
C-72, C-74
NG
Repair
INSPECTION PROCEDURE 24
Engine control relay and ignition switch-IG system
Probable cause
When the ignition switch ON signal is input to the engine-ECU, the
engine-ECU turns on the engine control relay.
This causes system voltage to be supplied to the engine-ECU and to the
sensors and actuators.
D Malfunction of the ignition switch
D Malfunction of the engine control relay
D Open circuit or short-circuited harness wire of the
engine control relay circuit
D Malfunction of the engine-ECU
OK
Check the trouble symptoms.
NG
Check the harness wire between the
battery and the engine control relay,
and repair if necessary.
OK
Check the engine-ECU power supply
and earth circuit system. (Refer to
P.13A-62, INSPECTION PROCE-
DURE 23.)
OK
Measure at the engine control relay
connector A-43X.
D Disconnect the connector, and
measure at the harness side.
D Voltage between 3, 4 and earth
OK: System voltage
NG
Check the following connector:
A-36
NG
Repair
Check the engine control relay. (Refer
to P.13A-102.)
NG
Replace
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