Nissan Frontier. Instruction — part 845
GI-48
< BASIC INSPECTION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Note in the illustration that there is an excessive 4.1 volt drop between the battery and the bulb.
Measuring Voltage Drop — Step-by-Step
• The step-by-step method is most useful for isolating excessive drops in low voltage systems (such as those
in “Computer Controlled Systems”).
• Circuits in the “Computer Controlled System” operate on very low amperage.
• The (Computer Controlled) system operations can be adversely affected by any variation in resistance in the
system. Such resistance variation may be caused by poor connection, improper installation, improper wire
gauge or corrosion.
• The step by step voltage drop test can identify a component or wire with too much resistance.
CONTROL UNIT CIRCUIT TEST
System Description
• When the switch is ON, the control unit lights up the lamp.
CASE 1
SGI974
SAIA0258E
MGI034A
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-49
< BASIC INSPECTION >
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INPUT-OUTPUT VOLTAGE CHART
• The voltage value is based on the body ground.
• *: If high resistance exists in the switch side circuit (caused by a single strand), terminal 1 does not detect battery voltage. Control unit
does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not supply power to light up the
lamp.
CASE 2
INPUT-OUTPUT VOLTAGE CHART
• The voltage value is based on the body ground.
• *: If high resistance exists in the switch side circuit (caused by a single strand), terminal 2 does not detect approx. 0V. Control unit
does not detect the switch is ON even if the switch does not turn ON. Therefore, the control unit does not control ground to light up the
lamp.
Terminal No.
Description
Condition
Value (Approx.)
In case of high resistance such as single
strand (V) *
+
−
Signal name
Input/
Output
1
Body
ground
Switch
Input
Switch ON
Battery voltage
Lower than battery voltage Approx. 8 (Ex-
ample)
Switch OFF
0 V
Approx. 0
2
Body
ground
Lamp
Output
Switch ON
Battery voltage
Approx. 0 (Inoperative lamp)
Switch OFF
0 V
Approx. 0
Terminal No.
Description
Condition
Value (Approx.)
In case of high resistance such as single
strand (V) *
+
−
Signal name
Input/
Output
1
Body
ground
Lamp
Output
Switch ON
0V
Battery voltage (Inoperative lamp)
Switch OFF
Battery voltage
Battery voltage
2
Body
ground
Switch
Input
Switch ON
0 V
Higher than 0 Approx. 4 (Example)
Switch OFF
5 V
Approx. 5
MGI035A
GI-50
< BASIC INSPECTION >
CONSULT CHECKING SYSTEM
CONSULT CHECKING SYSTEM
Description
INFOID:0000000009480236
NOTE:
This vehicle is diagnosed using CONSULT-III plus.
• When CONSULT is connected with a data link connector equipped
on the vehicle side, it will communicate with the control unit
equipped in the vehicle and then enable various kinds of diagnos-
tic tests.
• Refer to CONSULT-III plus Operation Instruction for more information.
Function and System Application
INFOID:0000000009480237
x: Applicable
*1: With 4WD
*2: With electronic locking rear differential
*3: With automatic transmission
*4: With auto A/C
*5: With NAVI
CONSULT Data Link Connector (DLC) Circuit
INFOID:0000000009480238
INSPECTION PROCEDURE
BBIA0538E
Direct Diagnostic Mode
Description
ALL MODE A
W
D/4WD
*1
ABS
IPDM E/R
BC
M
DIFF LO
CK
*2
TRANSMISSION
*3
AIR B
A
G
MET
E
R/M
&
A
ENGINE
HV
AC
*4
MUL
T
I A
V
*5
ECU Identification
The ECU part number is displayed.
-
x
-
x
x
x
x
-
x
x
x
Self Diagnostic Result
The ECU self diagnostic results are displayed.
x
x
x
x
x
x
x
x
x
x
x
Data Monitor
The ECU input/output data is displayed in real time.
x
x
x
x
x
x
x
x
x
x
x
Active Test
The ECU activates outputs to test components.
-
x
x
x
-
-
-
-
x
-
-
Work support
The settings for ECU functions can be changed.
-
x
-
x
-
-
-
x
x
-
-
DTC Work Support
The status of system monitoring tests and the self
diagnosis status/results can be confirmed.
-
-
-
-
-
x
-
-
x
-
-
TROUBLE DIAG
RECORD
Self diagnostic history and trouble diagnosis
records in ECU are displayed.
-
-
-
-
-
-
x
-
-
-
-
Configuration
• The vehicle specification can be read and saved.
• The vehicle specification can be written when re-
placing ECU.
-
-
-
x
-
x
-
-
-
-
x
Cause of Warning Lamp
States the reason the air bag warning lamp is ON.
-
-
-
-
-
-
x
-
-
-
-
CAN Diagnosis
This mode displays network diagnostic results of
CAN communication using a diagram.
x
x
x
x
x
x
x
x
x
x
x
CAN Diag Support Mntr
The result of transmit/receive diagnosis of CAN
communication is displayed.
x
x
x
x
x
x
x
x
x
x
x
CONSULT CHECKING SYSTEM
GI-51
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If the CONSULT cannot diagnose the system properly, check the following items.
NOTE:
The CAN and DDL2 circuits from DLC pins 6, 7 and 14 may be connected to more than one system. A short in
any circuit connected to a control unit in one system may affect CONSULT access to other systems.
Symptom
Check item
CONSULT cannot access any
system.
• CONSULT DLC power supply circuit (Terminal 8 and 16) and ground circuit (Terminal 4 and 5)
CONSULT cannot access indi-
vidual system. (Other systems
can be accessed.)
• Power supply and ground circuit for the control unit of the system (For detailed circuit, refer to wiring
diagram for each system.)
• Open or short circuit between the system and CONSULT DLC (For detailed circuit, refer to wiring
diagram for each system.)
• Open or short circuit CAN communication line. Refer to
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