Nissan Altima L32. Instruction — part 438
P1148 CLOSED LOOP CONTROL
EC-873
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
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K
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A
EC
N
P
O
P1148 CLOSED LOOP CONTROL
DTC Logic
INFOID:0000000004349840
DTC DETECTION LOGIC
NOTE:
DTC P1148 is displayed with another DTC for A/F sensor 1.
Perform the trouble diagnosis for the corresponding DTC.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1148
Closed loop control
function
The closed loop control function for bank 1 does
not operate even when vehicle is driving in the
specified condition.
• Harness or connectors
(The A/F sensor 1 circuit is open or short-
ed.)
• A/F sensor 1
• A/F sensor 1 heater
The closed loop control function for bank 2 does
not operate even when vehicle is driving in the
specified condition.
EC-874
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1217 ENGINE OVER TEMPERATURE
P1217 ENGINE OVER TEMPERATURE
DTC Logic
INFOID:0000000004349841
DTC DETECTION LOGIC
NOTE:
• If DTC P1217 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1217 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
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.
CAUTION:
When a malfunction is indicated, be sure to replace the coolant. Refer to
. Also, replace the engine oil. Refer to
.
1. Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Be sure to
use coolant with the proper mixture ratio. Refer to
MA-12, "Engine Oil Recommendation"
.
2. After refilling coolant, run engine to ensure that no water-flow noise is emitted.
DTC CONFIRMATION PROCEDURE
1.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-874, "Component Function Check"
NOTE:
Use component function check to check the overall function of the cooling fan. During this check, a DTC might
not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000004349842
1.
PERFORM COMPONENT FUNCTION CHECK-I
WARNING:
Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure 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.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1217
Engine over tempera-
ture (Overheat)
• Cooling fan does not operate properly (Over-
heat).
• Cooling fan system does not operate proper-
ly (Overheat).
• Engine coolant was not added to the system
using the proper filling method.
• Engine coolant is not within the specified
range.
• Harness or connectors
(The cooling fan circuit is open or short-
ed.)
• IPDM E/R (Cooling fan relay-1)
• Cooling fan relays-2 and -3
• Cooling fan motor
• Radiator hose
• Radiator
• Radiator cap
• Reservoir tank
• Water pump
• Thermostat
• Water control valve
P1217 ENGINE OVER TEMPERATURE
EC-875
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
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K
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M
A
EC
N
P
O
Check the coolant level in the reservoir tank and radiator.
Allow engine to cool before checking coolant level.
Is the coolant level in the reservoir tank and/or radiator below the
proper range?
YES
>> Go to
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Confirm whether customer filled the coolant or not.
Did customer fill the coolant?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM COMPONENT FUNCTION CHECK-III
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.
3. Make sure that cooling fan motors-1 and -2 operate at each speed (LOW/HI).
Without CONSULT-III
Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000004349843
1.
CHECK COOLING FAN OPERATION
With CONSULT-III
1. Turn ignition switch ON.
2. Perform “COOLING FAN” in “ACTIVE TEST” mode with CONSULT-III.
3. Make sure that cooling fan motors-1 and -2 operate at each speed (LOW/HI).
Without CONSULT-III
1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to
.
2. Make sure that cooling fan motors-1 and -2 operate at each speed (Low/High).
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
2.
CHECK COOLING SYSTEM FOR LEAK-I
Check cooling system for leak. Refer to
Is leakage detected?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK COOLING SYSTEM FOR LEAK-II
Check the following for leak. Refer to
.
• Hose
• Radiator
• Water pump
SEF621W
EC-876
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1217 ENGINE OVER TEMPERATURE
>> Repair or replace malfunctioning part.
4.
CHECK RADIATOR CAP
Check radiator cap. Refer to
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace radiator cap.
5.
CHECK THERMOSTAT
Check thermostat. Refer to
CO-21, "Removal and Installation"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace thermostat.
6.
CHECK WATER CONTROL VALVE
Check water control valve. Refer to
CO-23, "Removal and Installation"
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace water control valve
7.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
EC-712, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace engine coolant temperature sensor.
8.
CHECK MAIN 13 CAUSES
If the cause cannot be isolated, check the following.
Engine
Step
Inspection item
Equipment
Standard
Reference page
OFF
1
• Blocked radiator
• Blocked condenser
• Blocked radiator grille
• Blocked bumper
• Visual
No blocking
—
2
• Coolant mixture
• Coolant tester
MA-12, "Engine Oil Recommendation"
3
• Coolant level
• Visual
Coolant up to MAX level in
reservoir tank and radiator
filler neck
CO-12, "Changing Engine
Coolant"
4
• Radiator cap
• Pressure tester
ON*
2
5
• Coolant leaks
• Visual
No leaks
ON*
2
6
• Thermostat
• Touch the upper and
lower radiator hoses
Both hoses should be hot
CO-21, "Removal and In-
stallation"
ON*
1
7
• Cooling fan motor
• CONSULT-III
Operating
EC-369, "Component
Function Check"
OFF
8
• Combustion gas leak
• Color checker chemical
tester 4 Gas analyzer
Negative
—
ON*
3
9
• Coolant temperature
gauge
• Visual
Gauge less than 3/4 when
driving
—
• Coolant overflow to res-
ervoir tank
• Visual
No overflow during driving
and idling
OFF*
4
10
• Coolant return from res-
ervoir tank to radiator
• Visual
Should be initial level in
reservoir tank
OFF
11
• Water control valve
• Remove and inspect
the valve
Within the specified value
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