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Inspection Procedure 30
Intercooler water spray circuit system
D When the intercooler water spray switch (manual) turns ON, the intercooler
water spray manual ON signal is input to the engine-ECU. After receiving
this signal, the engine-ECU turns the intercooler water spray relay ON. The
intercooler water spray motor is driven to inject the water for air cooling into
the intercooler and increase the filling performance.
D When the intercooler water spray switch (automatic) turns ON, the intercooler
water spray automatic ON signal is input to the engine-ECU. After receiving
this signal, the engine-ECU turns the intercooler water spray relay ON
intermittently during high- load operation. The intercooler water spray motor is
driven to inject the water for air cooling into the intercooler and increase the
filling performance.
Check the intercooler water spray
injection.
D Ignition switch: ON
D Intercooler water spray switch
(manual): ON
OK: The intercooler water spray
injects water.
NG
Check the intercooler water spray
injection.
D Disconnect the C-118
engine-ECU connector, and earth
the terminal No. 55.
D Ignition switch: ON
OK: The intercooler water spray
injects water.
NG
Check the following connector:
C-222
OK
Check the intercooler water spray
relay. (Refer to GROUP 15 - Intake
and Exhaust.)
OK
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MPI -
Troubleshooting
OK
Measure at the D-34 intercooler
water spray switch connector.
D Disconnect the connector to
measure at the harness side.
D Ignition switch: ON
D Voltage between terminal No. 5
and earth
OK: System voltage
NG
Check the following connectors:
C-122, C-130
OK
Check the harness between the
engine-ECU and intercooler water
spray switch.
D Check for disconnection and
short-circuit of the signal cable.
OK
Replace the engine-ECU.
OK
Measure at the D-34 intercooler
water spray switch connector.
D Disconnect the connector to
measure at the harness side.
D Ignition switch: ON
D Voltage between terminal No. 3,
terminal No. 5 and earth
OK: System voltage
NG
Check the following connectors:
C-115, C-122, C-130
OK
Check the harness between the
engine-ECU and intercooler water
spray switch.
D Check for disconnection and
short-circuit of the signal cable.
OK
Replace the engine-ECU.
NG
Repair
NG
Replace the intercooler water spray
relay.
Probable cause
D Intercooler water spray switch malfunction
D Intercooler water spray relay malfunction
D Intercooler water spray motor malfunction
D Intercooler water spray relay circuit disconnection,
short - circuit, or connector contact defect
D Intercooler water spray switch circuit disconnection,
short - circuit, or connector contact defect
D Ignition switch malfunction
D Engine-ECU malfunction
OK
Check the following connector: D-34
Check the intercooler water spray
switch. (Refer to GROUP 15 -
Intake and Exhaust.)
Check the harness between the
intercooler water spray switch and
NG
engine-ECU.
Repair
D Check for damage of the earth
Intermittent malfunction (Refer to
GROUP 00 - Points to Note for
NG
Intermittent Malfunctions.)
Repair
OK
Check the following connector: D-34
Check the intercooler water spray
switch. (Refer to GROUP 15 -
Intake and Exhaust.)
Check the following connector: C-08
NG
Repair
Check the harness between the
intercooler water spray switch and
earth.
D Check for disconnection and
NG
Repair
Check and repair the harness
between the intercooler water spray
switch and engine-ECU.
D Check for damage of the signal
cable.
13A-97
OK
NG
Repair
NG
OK
Repair
cable.
OK
NG
Repair
NG
OK
Repair
NG
OK
Repair
NG
OK
Repair
damage of the earth cable.
NG
OK
Repair
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