Nissan Versa Sedan. Manual — part 467
GI-50
< BASIC INSPECTION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
• When inspecting a ground connection follow these rules:
- Remove the ground bolt or screw.
- Inspect all mating surfaces for tarnish, dirt, rust, etc.
- Clean as required to assure good contact.
- Reinstall bolt or screw securely.
- Inspect for “add-on” accessories which may be interfering with the ground circuit.
- If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eye-
let make sure no ground wires have excess wire insulation.
• For detailed ground distribution information, refer to “Ground Distribution” in PG section.
VOLTAGE DROP TESTS
• Voltage drop tests are often used to find components or circuits which have excessive resistance. A voltage
drop in a circuit is caused by a resistance when the circuit is in operation.
• Check the wire in the illustration. When measuring resistance with DMM, contact by a single strand of wire
will give reading of 0 ohms. This would indicate a good circuit. When the circuit operates, this single strand
of wire is not able to carry the current. The single strand will have a high resistance to the current. This will
be picked up as a slight voltage drop.
• Unwanted resistance can be caused by many situations as follows:
- Undersized wiring (single strand example)
- Corrosion on switch contacts
- Loose wire connections or splices.
• If repairs are needed always use wire that is of the same or larger gauge.
Measuring Voltage Drop — Accumulated Method
• Connect the DMM across the connector or part of the circuit you want to check. The positive lead of the
DMM should be closer to power and the negative lead closer to ground.
• Operate the circuit.
• The DMM will indicate how many volts are being used to “push” current through that part of the circuit.
SGI853
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
GI-51
< BASIC INSPECTION >
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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
GI-52
< BASIC INSPECTION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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
CONSULT CHECKING SYSTEM
GI-53
< BASIC INSPECTION >
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CONSULT CHECKING SYSTEM
Description
INFOID:0000000009266910
NOTE:
This vehicle is diagnosed using the 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 Manual” for more informa-
tion.
Function and System Application
INFOID:0000000009266911
x : Applicable
1: With continuously variable transmission
2: With automatic transmission
1
: Hood release handle
2
: Data link connector
ALAIA0095ZZ
Direct Diagnostic Mode
Description
ABS
EPS
IPDM E/R
BC
M
TRANSMISSION
1
A/T
2
AIR B
A
G
MET
E
R/M
&
A
ENGINE
MUL
T
I A
V
OCCUP
ANT DETECTION
Self Diagnostic Result
The ECU self diagnostic results are displayed.
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
-
Work support
The settings for ECU functions can be changed.
x
-
-
x
x
x
-
-
x
-
x
Active Test
The ECU activates outputs to test components.
x
-
x
x
-
-
-
-
x
-
-
ECU Identification
The ECU part number is displayed.
x
x
x
x
x
x
x
-
x
x
-
DTC Work Support
The status of system monitoring tests and the self diagno-
sis status/results can be confirmed.
-
-
-
-
-
x
-
-
x
-
-
Warning History
Displays the history of the combination meter warning
lamp indicators.
-
-
-
-
-
-
-
x
-
-
-
TROUBLE DIAG RECORD
Other results or histories, etc. that are recorded in ECU are
displayed.
-
-
-
-
-
-
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
-
CAN Diag Support Mntr
The result of transmit/receive diagnosis of CAN communi-
cation is displayed.
x
x
x
x
x
x
x
x
x
x
-
Configuration
• The vehicle specification can be read and saved.
• The vehicle specification can be written when replacing
ECU.
-
-
-
x
-
-
-
-
-
x
-
CALIB DATA
The calibration values of the ECU are displayed.
-
-
-
-
x
-
-
-
-
-
-
SRT & P-DTC Confirmation
The status of system monitoring tests and the self diagno-
sis status/results can be confirmed.
-
-
-
-
-
-
-
-
x
-
-
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