Nissan Teana J32. Instruction — part 446
EC-322
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
ASCD BRAKE SWITCH
3.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ASCD brake switch harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK ASCD BRAKE SWITCH
EC-322, "Component Inspection (ASCD Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace ASCD brake switch.
5.
CHECK INTERMITTENT INCIDENT
GI-35, "Intermittent Incident"
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000003858143
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-6, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch.
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E49
2
E16
110
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released.
Existed
Slightly depressed.
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released.
Existed
Slightly depressed.
Not existed
ASCD INDICATOR
EC-323
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
ASCD INDICATOR
Description
INFOID:0000000003856824
ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE lamp illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD
system is ready for operation.
SET lamp illuminates when the following conditions are met.
• CRUISE lamp is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of the
ASCD setting.
SET lamp remains lit during ASCD control.
Refer to
for the ASCD function.
Component Function Check
INFOID:0000000003856825
1.
CHECK ASCD INDICATOR FUNCTION
Check ASCD indicator under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000003856826
1.
CHECK DTC
Check that DTC U1000 or U1001 is not displayed.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble diagnosis for DTC U1000, U1001. Refer to
2.
CHECK COMBINATION METER FUNCTION
MWI-33, "CONSULT-III Function (METER/M&A)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK INTERMITTENT INCIDENT
GI-35, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace combination meter.
NO
>> Repair or replace malfunctioning part.
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE LAMP
• Ignition switch: ON
• MAIN switch: Pressed at the
1st time
→
at the 2nd time
ON
→
OFF
SET LAMP
• MAIN switch: ON
• When vehicle speed is be-
tween 40 km/h (25 MPH) and
144 km/h (89 MPH)
• ASCD: Operating
ON
• ASCD: Not operating
OFF
EC-324
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
COOLING FAN
COOLING FAN
Description
INFOID:0000000003856827
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant
pressure, and air conditioner ON signal. The control system has 4-step control [HIGH/MIDDLE/LOW/OFF].
COOLING FAN MOTOR
The cooling fan operates at each speed when the current flows in the cooling fan motor as per the following.
The cooling fan operates at low (LOW) speed when cooling fan motors-1 and -2 are circuited in series under
the middle speed condition.
Refer to
Component Function Check
INFOID:0000000003856828
1.
CHECK COOLING FAN FUNCTION
With CONSULT-III
1.
Turn ignition switch ON.
2.
Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.
3.
Check that cooling fan speed varies according to the percent.
Without CONSULT-III
1.
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
2.
Check that cooling fan operates.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000003856829
1.
CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect cooling fan relays-2, -3.
3.
Turn ignition switch ON.
4.
Check the voltage between cooling fan relays-2, -3 harness connectors and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
Cooling fan speed
Cooling fan motor terminals
(+)
(
−
)
Middle (MID)
1
3 and 4
2
3 and 4
1 and 2
3
1 and 2
4
High (HI)
1 and 2
3 and 4
Cooling fan relay
Ground
Voltage
Connector
Terminal
E57
(cooling fan relay-2)
2
Ground
Battery voltage
5
E59
(cooling fan relay-3)
2
5
COOLING FAN
EC-325
< COMPONENT DIAGNOSIS >
[VQ25DE, VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
DETECT MALFUNCTIONING PART
Check the following.
• 40A fusible link (letter K)
• 10A fuse (No.42)
• IPDM E/R harness connector E10
• Harness for open or short between cooling fan relay-2 and battery
• Harness for open or short between cooling fan relay-3 and battery
• Harness for open or short between cooling fan relay-2 and IPDM E/R
• Harness for open or short between cooling fan relay-3 and IPDM E/R
>> Repair open circuit, short to ground or short to power in harness or connectors.
3.
CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connectors.
3.
Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connec-
tor.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT
1.
Disconnect cooling fan motor-1 harness connector.
2.
Check the voltage between cooling fan motor-1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connector E70, E305
• 40A fusible link (letter M)
• Harness for open or short between cooling fan motor-1 and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK COOLING FAN MOTOR CIRCUIT-I
1.
Disconnect cooling fan motor-2 harness connector.
2.
Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor-1, -2 har-
ness connectors.
Cooling fan relay
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E57
(cooling fan relay-2)
1
E11
42
Existed
E59
(cooling fan relay-3)
1
E10
34
Cooling fan motor-1
Ground
Voltage
Connector
Terminal
E301
1
Ground
Battery voltage
2
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