Nissan Titan. Instruction — part 577
STR-12
< DTC/CIRCUIT DIAGNOSIS >
B TERMINAL CIRCUIT
DTC/CIRCUIT DIAGNOSIS
B TERMINAL CIRCUIT
Description
INFOID:0000000009886983
Terminal "1" (B) is constantly supplied with battery power.
Diagnosis Procedure
INFOID:0000000009886984
Regarding Wiring Diagram information, refer to
.
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 F27 terminal 1 connection is clean and tight.
3. Check voltage between starter motor connector F27 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 F27 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?
YES
>> Terminal 1 circuit is OK. Further inspection is necessary. Refer to
or
STR-8, "Work Flow (Without GR8-1200 NI)"
NO
>> Check the starter motor case to engine mounting for high resistance.
(+)
(-)
Voltage
Connector
Terminal
F27
1
Ground
Battery voltage
(+)
(-)
Condition
Voltage
Battery (+) terminal
Connector
Terminal
F27
1
While cranking the engine
Less than 0.2V
(+)
(-)
Condition
Voltage
Starter motor case
Battery (-) terminal
While cranking the engine
Less than 0.2V
S CONNECTOR CIRCUIT
STR-13
< DTC/CIRCUIT DIAGNOSIS >
C
D
E
F
G
H
I
J
K
L
M
A
STR
N
P
O
S CONNECTOR CIRCUIT
Description
INFOID:0000000009886985
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
INFOID:0000000009886986
Regarding Wiring Diagram information, refer to
.
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 F28.
3. Shift transmission into park or neutral.
4. Check voltage between starter motor harness connector F28 terminal 2 and ground with the ignition in
START.
Is battery voltage present?
YES
>> Magnetic switch circuit is OK. Further inspection is necessary. Refer to
STR-8, "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 F28 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 and starter motor connector F28.
2. Check continuity between starter motor harness connector F28 terminal 2 and IPDM E/R harness connec-
tor E120 terminal 19.
3. Check continuity between starter motor harness connector F28 terminal 2 and ground.
Are the continuity test results as specified?
YES
>> Further inspection is necessary. Refer to
STR-4, "Work Flow (With GR8-1200 NI)"
"Work Flow (Without GR8-1200 NI)"
.
NO
>> Repair the harness.
(+)
(-)
Condition
Voltage
Connector
Terminal
F28
2
Ground
Ignition in START
Battery voltage
Connector
Terminal
Connector
Terminal
Continuity
F28
2
E120
19
Yes
Connector
Terminal
—
Continuity
F28
2
Ground
No
STR-14
< WIRING DIAGRAM >
STARTING SYSTEM
WIRING DIAGRAM
STARTING SYSTEM
Wiring Diagram
INFOID:0000000009886987
ABBWA0928GB
STARTING SYSTEM
STR-15
< WIRING DIAGRAM >
C
D
E
F
G
H
I
J
K
L
M
A
STR
N
P
O
ABBIA1434GB
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