Nissan X-Trail 32. Instruction — part 1018
P2681 ENGINE COOLANT BYPASS VALVE
EC-1201
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK ENGINE COOLANT BYPASS VALVE POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect IPDM E/R harness connector.
3.
Check the continuity between engine coolant bypass valve harness connector and IPDM E/R harness
connector.
4.
Also check harness for short to gound.
Is the inspection result normal?
YES
>> Check IPDM E/R.
NO
>> Repair or replace error-detected parts.
4.
CHECK ENGINE COOLANT BYPASS VALVE CONTROL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between engine coolant bypass valve harness connector and ECM harness connec-
tor.
4.
Also check harness for short to power and short to ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK ENGINE COOLANT BYPASS VALVE
Check the engine coolant bypass valve. Refer to
EC-1201, "Component Inspection"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant bypass valve.
Component Inspection
INFOID:0000000010935909
1.
CHECK ENGINE COOLANT BYPASS VALVE
1.
Turn ignition switch OFF.
2.
Disconnect engine coolant bypass valve harness connector.
3.
Check the resistance between engine coolant bypass valve as per the following conditions.
+
-
Voltage
Engine coolant bypass valve
Connector
Terminal
F160
2
Ground
Battery voltage
+
-
Continuity
Engine coolant bypass
valve
IPDM E/R
Connector
Terminal
Connector
Terminal
F160
2
F72
73
Existed
+
-
Continuity
Engine coolant bypass
valve
ECM
Connector
Terminal
Connector
Terminal
F160
1
F117
53
Existed
EC-1202
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P2681 ENGINE COOLANT BYPASS VALVE
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace engine coolant bypass valve.
Engine coolant bypass valve
Condition
Resistance (
Ω
)
+
-
Terminal
1
2
Temperature
[
°
C (
°
F)]
-40
°
C (-40
°
F)
32 - 37
23
°
C (73
°
F)
43 - 49
P2A06 A/F SENSOR
EC-1203
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P2A06 A/F SENSOR
DTC Description
INFOID:0000000010935910
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Harness or connectors (A/F sensor circuit is open.)
• A/F sensor
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PERFORM DIAGNOSIS PROCEDURE
NOTE:
DTC P2A06 can not duplicate.
>> Proceed to
EC-1203, "Diagnosis Procedure"
.
Diagnosis Procedure
INFOID:0000000010935911
1.
CHECK ECM HARNESS CONNECTOR CONNECTIONS
1.
Turn ignition switch OFF.
2.
Check ECM harness connector connection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace error-detected parts.
2.
CHECK AIR FUEL RATIO (A/F) SENSOR HARNESS CONNECTOR CONNECTIONS
Check A/F sensor harness connector connection.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
3.
CHECK A/F SENSOR CIRCUIT FOR OPEN AND SHORT
Check A/F sensor circuit for open and short.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P2A06
PROPOR RICH SEN CIRC
(O2 sensor negative voltage bank 1 sensor
1)
• CO: OPEN CIRCUIT
ECM detects air fuel ratio (A/F) sensor ground circuit is open circuit.
+
-
Continuity
ECM
A/F sensor
Connector
Terminal
Connector
Terminal
F117
89
F166
3
Existed
F118
115
6
116
2
119
1
EC-1204
< DTC/CIRCUIT DIAGNOSIS >
[R9M]
P2A06 A/F SENSOR
4.
CHECK INTERMITTENT INCIDENT
Perform
GI-44, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
REPLACE A/F SENSOR
Replace A/F sensor.
CAUTION:
• Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.
• Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor
Thread Cleaner tool and approved anti-seize lubricant.
>> INSPECTION END
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