Nissan Titan. Manual — part 289
ELECTRICAL LOAD SIGNAL
EC-457
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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ELECTRICAL LOAD SIGNAL
Description
INFOID:0000000009886914
The electrical load signal (Headlamp switch signal, etc.) is transferred through the CAN communication line
from BCM to ECM via IPDM E/R.
Diagnosis Procedure
INFOID:0000000009886915
1.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1. Turn ignition switch ON.
2. Connect CONSULT and select “DATA MONITOR” mode.
3. Select “LOAD SIGNAL” and check indication under the following conditions.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check “LOAD SIGNAL” indication under the following conditions.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 5.
3.
CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION
Select “HEATER FAN SW” and check indication under the following conditions.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
4.
CHECK REAR WINDOW DEFOGGER SYSTEM
.
>> INSPECTION END
5.
CHECK HEADLAMP SYSTEM
>> INSPECTION END
6.
CHECK HEATER FAN CONTROL SYSTEM
Refer to
HAC-17, "CONSULT Function (HVAC)"
(with automatic air conditioner) or
(with manual air conditioner).
Condition
Indication
Rear window defogger switch: ON
ON
Rear window defogger switch: OFF
OFF
Condition
Indication
Lighting switch: ON at 2nd position
ON
Lighting switch: OFF
OFF
Condition
Indication
Heater fan control switch: ON
ON
Heater fan control switch: OFF
OFF
EC-458
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ELECTRICAL LOAD SIGNAL
>> INSPECTION END
FUEL INJECTOR
EC-459
< DTC/CIRCUIT DIAGNOSIS >
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FUEL INJECTOR
Component Description
INFOID:0000000009886916
The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.
Diagnosis Procedure
INFOID:0000000009886917
1.
INSPECTION START
Turn ignition switch to START.
Is any cylinder ignited?
Yes or No
Yes
>> GO TO 2.
No
>> GO TO 3.
2.
CHECK OVERALL FUNCTION
With CONSULT
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.
3. Make sure that each circuit produces a momentary engine speed drop.
Without CONSULT
1. Start engine.
2. Listen to each fuel injector operating sound.
Clicking noise should be heard.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 3.
3.
CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect fuel injector harness connector.
3. Turn ignition switch ON.
SEF375Z
PBIB1986E
BBIA0374E
EC-460
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
FUEL INJECTOR
4. Check voltage between fuel injector terminal 1 and ground with
CONSULT or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E2, F32
• IPDM E/R connector E119
• 15A fuse
• Harness for open or short between fuel injector and fuse
>> Repair harness or connectors.
5.
CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between fuel injector terminal 2 and ECM terminals 21, 22, 23, 40, 41, 42, 44,
63.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK FUEL INJECTOR
EC-460, "Component Inspection"
OK or NG
OK
>> GO TO 7.
NG
>> Replace malfunctioning fuel injector.
7.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
and
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000009886918
FUEL INJECTOR
1. Disconnect fuel injector harness connector.
Voltage: Battery voltage
PBIB0582E
Continuity should exist.
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