Nissan Sentra. Instruction — part 415
EC-356
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0850 PNP SWITCH
Follow the procedure “With CONSULT” above.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Component Function Check
INFOID:0000000009758608
1.
CHECK PNP SIGNAL FUNCTION
With CONSULT
1. Turn ignition switch ON.
2. Select “P/N POSI SW” in “DATA MONITOR” mode of “ENGINE” using CONSULT. Then check the “P/N
POSI SW” signal as per the following conditions.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Proceed to
.
2.
PERFORM COMPONENT FUNCTION CHECK
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector and ground as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009758609
1.
INSPECTION START
Check which type of transmission the vehicle is equipped with.
Which type of transmission?
CVT models>>GO TO 2.
M/T models>>GO TO 6.
2.
CHECK TRANSMISSION RANGE SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect transmission range switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between transmission range switch harness connector and ground.
Selector lever position
Indication
N or P position (CVT)
Neutral position (M/T)
ON
Except above position
OFF
ECM
Condition
Voltage
(Approx.)
Connector
+
−
Terminal
E16
117
128
Selector lever
• P or N (CVT)
• Neutral (M/T)
Battery voltage
Except above
0 V
P0850 PNP SWITCH
EC-357
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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 TRANSMISSION RANGE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connector.
3. Check the continuity between transmission range switch harness connector and IPDM E/R harness con-
nector.
4. Also check harness for short to ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
4.
CHECK TRANSMISSION RANGE SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between transmission range switch harness connector and ECM harness connector.
4. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK TRANSMISSION RANGE SWITCH
Check the transmission range switch. Refer to
TM-165, "Component Inspection"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace transaxle assembly. Refer to
TM-283, "Removal and Installation"
.
6.
CHECK PARK/NEUTRAL POSITION (PNP) SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect PNP switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between PNP switch harness connector and ground.
+
−
Voltage
Transmission range switch
Connector
Terminal
F26
7
Ground
Battery voltage
+
−
Continuity
Transmission range switch
IPDM E/R
Connector
Terminal
Connector
Terminal
F26
7
E43
14
Existed
+
−
Continuity
Transmission range switch
ECM
Connector
Terminal
Connector
Terminal
F26
10
E16
117
Existed
EC-358
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P0850 PNP SWITCH
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Perform the trouble diagnosis for power supply circuit.
7.
CHECK PNP SWITCH INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between PNP switch harness connector and ECM harness connector.
4. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace error-detected parts.
8.
CHECK PNP SWITCH
Check the PNP switch. Refer to
TM-17, "PARK/NEUTRAL POSITION (PNP) SWITCH : Component Inspec-
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace PNP switch. Refer to
TM-21, "Removal and Installation"
.
+
−
Voltage
PNP switch
Connector
Terminal
F52
2
Ground
Battery voltage
+
−
Continuity
PNP switch
ECM
Connector
Terminal
Connector
Terminal
F52
3
E16
117
Existed
P1078 EVT CONTROL POSITION SENSOR
EC-359
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P1078 EVT CONTROL POSITION SENSOR
DTC Logic
INFOID:0000000009758610
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and let it idle for 10 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758611
1.
CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect exhaust valve timing (EVT) control position sensor harness connector.
3. Turn ignition switch ON.
4. Check the voltage between EVT control position sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Check sensor power supply 2 circuit. Refer to
.
Is inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1078
EXH TIM SEN/CIRC-B1
(Exhaust valve timing con-
trol position sensor circuit
bank 1)
An excessively high or low voltage from
the sensor is sent to ECM.
• Harness or connectors
(Exhaust valve timing control position sen-
sor circuit is open or shorted)
• Accumulation of debris to the signal pick-up
portion of the camshaft
• Exhaust valve timing control position sen-
sor
• Sensor power supply 2 circuit
+
−
Voltage
(Approx.)
EVT control position sensor
Connector
Terminal
F57
1
Ground
5.0 V
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