Infiniti I30 (A33). Manual — part 293
Wiring Diagram
NHEC0552
MEC758C
SEF629XB
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1212 ABS/TCS COMMUNICATION LINE
Wiring Diagram
EC-487
Diagnostic Procedure
NHEC0553
1
CHECK INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector and ABS/TCS control unit harness connector.
SEC004C
SEF280X
3. Check harness continuity between ECM terminal 114 and ABS/TCS control unit terminal 47.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK
©
GO TO 3.
NG
©
GO TO 2.
2
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors E81, M15
I
Harness connectors M47, F45
I
Check harness for open or short between ECM and ABS/TCS control unit.
©
Repair open circuit or short to ground or short to power in harness or connectors.
3
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-144.
©
INSPECTION END
DTC P1212 ABS/TCS COMMUNICATION LINE
Diagnostic Procedure
EC-488
System Description
NHEC0554
COOLING FAN CONTROL
NHEC0554S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Vehicle speed sensor
Vehicle speed
Cooling fan
control
Cooling fan relay(s)
Engine coolant temperature sensor
Engine coolant temperature
Air conditioner switch
Air conditioner “ON” signal
Ignition switch
Start signal
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refriger-
ant pressure and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
OPERATION
NHEC0554S02
SEF578XA
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0555
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
AIR COND SIG
I
Engine: After warming up, idle
the engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates)
ON
COOLING FAN
I
After warming up engine, idle
the engine.
I
Air conditioner switch: OFF
Engine coolant temperature is
94°C (201°F) or less
OFF
Engine coolant temperature is
between 95°C (203°F) and 104°C
(219°F)
LOW
Engine coolant temperature is
105°C (221°F) or more
HIGH
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1217 ENGINE OVER TEMPERATURE (OVERHEAT)
System Description
EC-489
On Board Diagnosis Logic
=NHEC0557
If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
Malfunction is detected when cooling fan does not operate properly (Overheat), cooling fan system does not
operate properly (Overheat) and engine coolant was not added to the system using the proper filling method.
Possible Cause
NHEC0563
I
Harness or connectors
(The cooling fan circuit is open or shorted.)
I
Cooling fan
I
Radiator hose
I
Radiator
I
Radiator cap
I
Water pump
I
Thermostat
For
more
information,
refer
to
“MAIN
12
CAUSES
OF
OVERHEATING”, EC-505.
CAUTION:
When a malfunction is indicated, be sure to replace the cool-
ant following the procedure in the MA-14, “Changing Engine
Coolant”. Also, replace the engine oil.
1)
Fill radiator with coolant up to specified level with a fill-
ing speed of 2 liters per minute. Be sure to use coolant
with the proper mixture ratio. Refer to MA-12, “Anti-
freeze Coolant Mixture Ratio”.
2)
After refilling coolant, run engine to ensure that no
water-flow noise is emitted.
SEF621W
SEF111X
Overall Function Check
NHEC0558
Use this procedure to check the overall function of the cooling fan.
During this check, a 1st trip DTC might not be confirmed.
WARNING:
Never remove the radiator cap when the engine is hot. Serious
burns could be caused by high pressure fluid escaping from
the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by
turning it a quarter turn to allow built-up pressure to escape.
Then turn the cap all the way off.
WITH CONSULT-II
NHEC0558S01
1)
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to “Diagnos-
tic Procedure”, EC-494.
2)
Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to “Diagnos-
tic Procedure”, EC-494.
3)
Turn ignition switch “ON”.
4)
Perform “COOLING FAN” in “ACTIVE TEST” mode with CON-
SULT-II.
DTC P1217 ENGINE OVER TEMPERATURE (OVERHEAT)
On Board Diagnosis Logic
EC-490
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