Nissan Pathfinder (2012 year). Manual — part 569
DIAGNOSIS AND REPAIR WORKFLOW
STR-9
< BASIC INSPECTION >
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Work Flow (Without GR8-1200 NI)
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OVERALL SEQUENCE
DETAILED FLOW
NOTE:
If any malfunction is found, immediately disconnect the battery cable from the negative terminal.
1.
CHECK ENGINE START
Crank the engine and check that the engine starts.
Does the engine start?
YES
>> GO TO 2.
NO
>> GO TO 3.
AWBIA1303GB
August 2012
2012 Pathfinder
STR-10
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
2.
CHECK THAT THE STARTER MOTOR STOPS
Check that the starter motor stops after starting the engine.
Does the starter motor stop?
YES
>> Inspection End.
NO
>> Replace starter motor. Refer to
STR-28, "Removal and Installation"
3.
CHECK THAT THE ENGINE TURNS WHEN CRANKING
Check that the engine turns when cranking.
Does engine turn when cranking?
YES
>> GO TO 4.
NO
>> GO TO 5.
4.
CHECK THE ENGINE SPEED WHEN CRANKING
Check that the engine speed is not low when cranking.
Does engine turn normally?
YES
>> Check ignition/fuel system.
NO
>> Check charge condition, corrosion and connection condition of the battery. Refer to
5.
CHECK STARTER MOTOR ACTIVATION
Check that the starter motor runs at cranking.
Does starter motor turn?
YES
>> Replace starter motor. Refer to
STR-28, "Removal and Installation"
NO
>> GO TO 6.
6.
CHECK POWER SUPPLY CIRCUIT
Check the following conditions:
• Fuse and fusible link
• Charge condition, corrosion and connection of the battery.
Are these inspection results normal?
YES
>> GO TO 7.
NO
>> Repair as needed.
7.
CHECK STARTING SYSTEM WIRING
Check the following:
• “B” terminal circuit. Refer to
STR-13, "Diagnosis Procedure - VQ40DE"
(VQ40DE) or
(VK56DE).
• “S” terminal circuit. Refer to
STR-16, "Diagnosis Procedure - VQ40DE"
(VQ40DE) or
(VK56DE).
Are the inspection results normal?
YES
>> Replace starter motor. Refer to
STR-28, "Removal and Installation"
NO
>> Repair as needed.
August 2012
2012 Pathfinder
STARTING SYSTEM
STR-11
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
STARTING SYSTEM
System Diagram
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System Description
INFOID:0000000007358905
The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The
starter motor is grounded to the cylinder block. With power and ground supplied, the starter motor operates.
Component Parts Location
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ALBIA0416GB
1.
A/T assembly F9 (with built in TCM
F502)
2.
IPDM E/R E120, E122, E124
3.
BCM M18 (view with instrument panel
lower LH panel removed)
AWBIA1153ZZ
August 2012
2012 Pathfinder
STR-12
< SYSTEM DESCRIPTION >
STARTING SYSTEM
Component Description
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Component part
Description
TCM
TCM supplies power to the starter relay inside the IPDM E/R when
the selector lever is shifted to the P or N position.
BCM
BCM sends a starter request signal to the CPU of the IPDM E/R
over the CAN communication lines.
IPDM E/R
CPU inside IPDM E/R operates the starter relay at the request of
the BCM over the CAN communication lines.
Starter motor
The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.
August 2012
2012 Pathfinder
B TERMINAL CIRCUIT
STR-13
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
B TERMINAL CIRCUIT
Description
INFOID:0000000007358908
For vehicles equipped with V6 engine (VQ40DE), terminal "2" (B) is constantly supplied with battery power.
For vehicles equipped with V8 engine (VK56DE), terminal "1" (B) is constantly supplied with battery power.
Diagnosis Procedure - VQ40DE
INFOID:0000000007358909
Regarding Wiring Diagram information, refer to
STR-19, "Wiring Diagram - VQ40DE"
.
CAUTION:
Before testing, perform the following procedure to ensure the engine cannot start.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is depleted.
1.
CHECK TERMINAL 2 POWER SUPPLY VOLTAGE
1. Turn ignition switch OFF.
2. Make sure that starter motor connector E210 terminal 2 connection is clean and tight.
3. Check voltage between starter motor connector E210 terminal 2
and ground.
Is there battery voltage present?
YES
>> GO TO 2
NO
>> Check harness between battery and starter motor for
open circuit.
2.
CHECK BATTERY CABLE (VOLTAGE DROP TEST)
1. Shift the transmission into park or neutral.
2. Check voltage between battery positive terminal and starter
motor connector E210 terminal 2 while cranking the engine.
Is the voltage drop less than 0.2V?
YES
>> GO TO 3
NO
>> Check harness between the battery and the starter
motor for high resistance.
3.
CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
(+)
(-)
Voltage
Connector
Terminal
E210
2
Ground
Battery voltage
AWBIA0122GB
(-)
(+)
Condition
Voltage
Connector
Terminal
E210
2
Battery (+)
terminal
While cranking the
engine
Less than 0.2V
AWBIA0123GB
August 2012
2012 Pathfinder
STR-14
< DTC/CIRCUIT DIAGNOSIS >
B TERMINAL CIRCUIT
Check voltage between starter motor case and battery negative ter-
minal while cranking the engine.
Is the voltage drop less than 0.2V?
YES
>> Terminal 2 circuit is OK. Further inspection necessary.
Refer to
STR-5, "Work Flow (With GR8-1200 NI)"
STR-9, "Work Flow (Without GR8-1200 NI)"
.
NO
>> Check the starter motor case to engine mounting for
high resistance.
Diagnosis Procedure - VK56DE
INFOID:0000000007358910
Regarding Wiring Diagram information, refer to
STR-23, "Wiring Diagram - VK56DE"
.
CAUTION:
Before testing, perform the following procedure to ensure the engine cannot start.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is depleted.
1.
CHECK TERMINAL 1 POWER SUPPLY VOLTAGE
1. Turn ignition switch OFF.
2. Make sure that starter motor connector F34 terminal 1 connection is clean and tight.
3. Check voltage between starter motor connector F34 terminal 1 and ground.
Is there battery voltage present?
YES
>> GO TO 2
NO
>> Check harness between battery and starter motor for open circuit.
2.
CHECK BATTERY CABLE (VOLTAGE DROP TEST)
1. Shift the transmission into park or neutral.
2. Check voltage between battery positive terminal and starter motor connector F34 terminal 1 while crank-
ing the engine.
Is the voltage drop less than 0.2V?
YES
>> GO TO 3
NO
>> Check harness between the battery and the starter motor for high resistance.
3.
CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
Check voltage between starter motor case and battery negative terminal while cranking the engine.
Is the voltage drop less than 0.2V?
(+)
(-)
Condition
Voltage
Starter motor
case
Battery (-) terminal
While cranking the
engine
Less than 0.2V
AWBIA0124GB
(+)
(-)
Voltage
Connector
Terminal
F34
1
Ground
Battery voltage
(-)
(+)
Condition
Voltage
Connector
Terminal
F34
1
Battery (+) terminal
While cranking the engine
Less than 0.2V
(+)
(-)
Condition
Voltage
Starter motor case
Battery (-) terminal
While cranking the engine
Less than 0.2V
August 2012
2012 Pathfinder
B TERMINAL CIRCUIT
STR-15
< DTC/CIRCUIT DIAGNOSIS >
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YES
>> Terminal 1 circuit is OK. Further inspection necessary. Refer to
STR-9, "Work Flow (Without GR8-1200 NI)"
NO
>> Check the starter motor case to engine mounting for high resistance.
August 2012
2012 Pathfinder
STR-16
< DTC/CIRCUIT DIAGNOSIS >
S CONNECTOR CIRCUIT
S CONNECTOR CIRCUIT
Description
INFOID:0000000007358911
For vehicles equipped with V6 engine (VQ40DE), terminal "1" (S) is the power supply for the starter motor
magnetic switch. Terminal 1 is supplied with power when the ignition switch is turned to the START position
while the selector lever is in the P or N position.
For vehicles equipped with V8 engine (VK56DE), terminal "2" (S) is the power supply for the starter motor
magnetic switch. Terminal 2 is supplied with power when the ignition switch is turned to the START position
while the selector lever is in the P or N position.
Diagnosis Procedure - VQ40DE
INFOID:0000000007358912
Regarding Wiring Diagram information, refer to
STR-19, "Wiring Diagram - VQ40DE"
.
CAUTION:
Before testing, perform the following procedure to ensure the engine cannot start.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
1.
CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect starter motor connector E207.
3. Shift transmission into park or neutral.
4. Check voltage between starter motor harness connector E207
terminal 1 and ground with the ignition in START.
Is battery voltage present?
YES
>> Magnetic switch circuit is OK. Further inspection necessary. Refer to
STR-9, "Work Flow (Without GR8-1200 NI)"
.
NO
>> GO TO 2
2.
CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check the IPDM E/R harness connector E120 and starter motor harness connector E207 for damage,
bent pins and loose connections.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair the terminal and connector.
3.
CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1. Disconnect IPDM E/R connector E120.
2. Check continuity between starter motor harness connector E207
(A) terminal 1 and IPDM E/R harness connector E120 (B) termi-
nal 19.
3. Check continuity between starter motor harness connector E207
(A) terminal 1 and ground.
(+)
(-)
Condition
Voltage
Connector
Terminal
E207
1
Ground
While cranking the
engine
Battery voltage
AWBIA0343ZZ
Starter motor
IPDM E/R
Continuity
Connector
Terminal
Connector
Terminal
E207 (A)
1
E120 (B)
19
Yes
AWBIA0344ZZ
August 2012
2012 Pathfinder
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