Infiniti QX56 (Z62). Manual — part 619
EC-454
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P1608 VVEL SENSOR POWER SUPPLY
4.
Also check harness for short to ground and power.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between VVEL control shaft position sensor and VVEL control module
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace VVEL control module. Refer to
EC-536, "Removal and Installation"
.
NO
>> Repair or replace.
5.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace.
6.
REPLACE VVEL LADDER ASSEMBLY
Replace VVEL ladder assembly. Refer to
EM-75, "Removal and Installation"
>> NSPECTION END
VVEL control shaft position sensor
VVEL control module
Continuity
Bank
Connector
Terminal
Connector
Terminal
1
F72
3
F56
7
Existed
6
20
2
F70
3
9
6
22
P1805 BRAKE SWITCH
EC-455
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P1805 BRAKE SWITCH
DTC Logic
INFOID:0000000006217957
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006217958
1.
CHECK STOP LAMP SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Check for stop lamp illumination under the following conditions.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Disconnect stop lamp switch harness connector.
2.
Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• 10 A fuse (No. 7)
• Harness for open or short between stop lamp switch and battery
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1805
BRAKE SW/CIRCUIT
(Brake switch)
A brake switch signal is not sent to ECM
for extremely long time while the vehicle
is being driven.
• Harness or connectors
(Stop lamp switch circuit is open or shorted.)
• Stop lamp switch
Condition
Stop lamp
Brake pedal
Fully released
Not illuminated
Slightly depressed
Illuminated
Stop lamp switch
Ground
Voltage
Connector
Terminal
E115
1
Ground
Battery voltage
EC-456
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P1805 BRAKE SWITCH
4.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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 and short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and stop lamp switch
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK STOP LAMP SWITCH
EC-456, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace stop lamp switch. Refer to
BR-20, "Removal and Installation"
.
7.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
Component Inspection (Stop Lamp Switch)
INFOID:0000000006217959
1.
CHECK STOP LAMP SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-II
1.
Adjust stop lamp switch installation. Refer to
BR-21, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E115
2
E80
158
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P1805 BRAKE SWITCH
EC-457
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
BR-20, "Removal and Installation"
.
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