Nissan Sentra. Manual — part 428
EC-408
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1800 INTAKE MANIFOLD TUNING VALVE
P1800 INTAKE MANIFOLD TUNING VALVE
DTC Logic
INFOID:0000000009758665
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
CONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11 V at idle.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to the normal operating temperature. [more than 60
°C (140°F)]
2. Let it idle for at least 10 seconds. (engine speed: less than 1,000 rpm)
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758666
1.
CHECK INTAKE MANIFOLD TUNING VALVE MOTOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK INTAKE MANIFOLD TUNING VALVE MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1800
VIAS S/V-1
(Variable intake air system con-
trol solenoid valve-1)
An excessively low or high voltage signal
is sent to ECM through the intake manifold
tuning valve.
• Harness or connectors
(The solenoid valve 1 circuit is open or
shorted.)
• Intake manifold tuning valve
ECM
Voltage
+
-
Connector
Terminal
Connector
Terminal
F24
6
E16
128
Battery voltage
P1800 INTAKE MANIFOLD TUNING VALVE
EC-409
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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5. 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.
3.
CHECK INTAKE MANIFOLD TUNING VALVE MOTOR OUTPUT SIGNAL CIRCUIT
1. Disconnect intake manifold tuning valve motor harness connector.
2. Check the continuity between intake manifold tuning valve motor harness connector and ECM harness
connector.
3. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK INTAKE MANIFOLD TUNING VALVE MOTOR
Check the intake manifold tuning valve motor. Refer to
EC-409, "Component Inspection (Intake Manifold Tun-
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace intake manifold assembly. Refer to
EM-27, "Removal and Installation"
Component Inspection (Intake Manifold Tuning Valve)
INFOID:0000000009758667
1.
CHECK INTAKE MANIFOLD TUNING VALVE MOTOR
1. Turn ignition switch OFF.
2. Disconnect intake manifold tuning valve motor harness connector.
3. Check the resistance between intake manifold tuning valve motor terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace intake manifold. Refer to
EM-27, "Removal and Installation"
.
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F24
6
E45
26
Existed
+
−
Continuity
Intake manifold tuning valve
motor
ECM
Connector
Terminal
Connector
Terminal
F56
1
F24
5
Existed
7
Not existed
2
5
Not existed
7
Existed
IMT valve motor
Resistance
(Approx.)
+
−
Terminals
1
2
3 - 8
Ω [at 25°C (77°F)]
EC-410
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1805 BRAKE SWITCH
P1805 BRAKE SWITCH
DTC Logic
INFOID:0000000009758668
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
NOTE:
Since this DTC is difficult to be confirmed, check component function to judge the normality.
>> Proceed to
EC-410, "Component Function Check"
.
Component Function Check
INFOID:0000000009758669
1.
CHECK BRAKE SWITCH FUNCTION
With CONSULT
1. On the CONSULT screen, select “ENGINE” >> “DATA MONITOR” >> “BRAKE SW 2”.
2. Check “STOP LAMP SW” indication under the following conditions.
Without CONSULT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Proceed to
.
Diagnosis Procedure
INFOID:0000000009758670
1.
CHECK STOP LAMP SWITCH OPERATION
1. Turn power switch OFF.
2. Check the stop lamp when depressing and releasing the brake pedal.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1805
BRAKE SW/CIRCUIT
(Brake switch circuit)
Stop lamp signal is not sent to ECM for ex-
tremely long time while the vehicle is driving.
• Harness or connectors
(Stop lamp switch circuit is open or
shorted.)
• Stop lamp switch
Monitor item
Condition
Indication
STOP LAMP SW
Brake pedal
Slightly depressed
ON
Fully released
OFF
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
Terminal
E16
115
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
0 V
Brake pedal
Stop lamp
Fully released
Not illuminated
Slightly depressed
Illuminated
P1805 BRAKE SWITCH
EC-411
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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EC
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Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY
1. Disconnect stop lamp switch harness connector.
2. Check the voltage between stop lamp switch harness connector and ground.
3. Also check harness for short to ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Pull out #30 fuse.
2. Check that the fuse is not fusing.
3. Check the continuity between stop lamp switch harness connector and fuse terminal.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> Check power supply circuit for 12V battery power supply.
NO
>> Repair or replace error-detected parts.
4.
CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to
EC-412, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Replace stop lamp switch. Refer to
.
5.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1. Disconnect stop lamp switch harness connector.
2. Disconnect ECM harness connector.
3. Check the continuity between stop lamp switch harness connector and ECM harness connector.
4. Also check harness for short to ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Repair or replace error-detected parts.
+
−
Voltage
Stop lamp switch
Connector
Terminal
E60
1
Ground
Battery voltage
+
−
Continuity
Stop lamp switch
Connector
Terminal
E60
1
#30 fuse ter-
minal
Existed
+
−
Continuity
Stop lamp switch
ECM
Connector
Terminal
Connector
Terminal
E60
2
E16
115
Existed
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