NISSAN 350Z 2007 Z33 General Information Owner's Guide

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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VOLTAGE CHECK METHOD
To help in understanding the diagnosis of open circuits please refer to the previous schematic.
In any powered circuit, an open can be found by methodically checking the system for the presence of voltage.
This is done by switching the DMM to the voltage function.

Connect one probe of the DMM to a known good ground.

Begin probing at one end of the circuit and work your way to the other end.

With SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).

Close SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).

Close the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the previous example.
Testing for “Shorts” in the Circuit
To simplify the discussion of shorts in the system, please refer to the following schematic.
RESISTANCE CHECK METHOD

Disconnect the battery negative cable and remove the blown fuse.

Disconnect all loads (SW1 open, relay disconnected and solenoid disconnected) powered through the
fuse.

Connect one probe of the DMM to the load side of the fuse terminal. Connect the other probe to a known
good ground.

With SW1 open, check for continuity.
continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.

Close SW1 and disconnect the relay. Put probes at the load side of fuse terminal and a known good
ground. Then, check for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.

Close SW1 and jump the relay contacts with jumper wire. Put probes at the load side of fuse terminal and
a known good ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.
VOLTAGE CHECK METHOD

Remove the blown fuse and disconnect all loads (i.e. SW1 open, relay disconnected and solenoid discon-
nected) powered through the fuse.

Turn the ignition key to the ON or START position. Verify battery voltage at the battery + side of the fuse
terminal (one lead on the battery + terminal side of the fuse block and one lead on a known good ground).

With SW1 open and the DMM leads across both fuse terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
SGI847-A

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Revision: 2006 November2007 350Z
no voltage; short is further down the circuit than SW1.

With SW1 closed, relay and solenoid disconnected and the DMM leads across both fuse terminals, check
for voltage.
voltage; short is between SW1 and the relay (point B).
no voltage; short is further down the circuit than the relay.

With SW1 closed, relay contacts jumped with fused jumper wire check for voltage.
voltage; short is down the circuit of the relay or between the relay and the disconnected solenoid (point C).
no voltage; retrace steps and check power to fuse block.
Ground Inspection
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
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
eyelet 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.
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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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.
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.
SGI974
SAIA0258E

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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
Revision: 2006 November2007 350Z
Control Unit Circuit Test
System Description:When the switch is ON, the control unit lights up the lamp.
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.
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.
MGI034A
Pin
No.Item ConditionVoltage
value [V]In case of high resistance such as single strand [V] *
1 SwitchSwitch ON Battery voltage Lower than battery voltage Approx. 8 (Example)
Switch OFF Approx. 0 Approx. 0
2LampSwitch ON Battery voltage Approx. 0 (Inoperative lamp)
Switch OFF Approx. 0 Approx. 0
MGI035A
Pin
No.Item ConditionVo l ta g e
value [V]In case of high resistance such as single strand [V] *
1LampSwitch ON Approx. 0 Battery voltage (Inoperative lamp)
Switch OFF Battery voltage Battery voltage
2 SwitchSwitch ON Approx. 0 Higher than 0 Approx. 4 (Example)
Switch OFF Approx. 5 Approx. 5

SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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Control Units and Electrical PartsNAS0009Q
PRECAUTIONS

Never reverse polarity of battery terminals.

Install only parts specified for a vehicle.

Before replacing the control unit, check the input and output and functions of the component parts.

Do not apply excessive force when disconnecting a connector.

Do not apply excessive shock to the control unit by dropping or
hitting it.

Be careful to prevent condensation in the control unit due to
rapid temperature changes and do not let water or rain get on it.
If water is found in the control unit, dry it fully and then install it in
the vehicle.

Be careful not to let oil to get on the control unit connector.

Avoid cleaning the control unit with volatile oil.

Do not disassemble the control unit, and do not remove the
upper and lower covers.

When using a DMM, be careful not to let test probes get close to
each other to prevent the power transistor in the control unit
from damaging battery voltage because of short circuiting.

When checking input and output signals of the control unit, use
the specified check adapter.
SAIA0255E
SEF348N

GI-36
CONSULT-III/GST CHECKING SYSTEM
Revision: 2006 November2007 350Z
CONSULT-III/GST CHECKING SYSTEMPFP:00000
DescriptionNAS000A4

When CONSULT-III/GST is connected with a data link connector
(A) equipped on the vehicle side, it will communicate with the
control unit equipped in the vehicle and then enable various
kinds of diagnostic tests.

Refer to CONSULT-III operation manual for more information.
Function and System Application NAS0000P
x: Applicable
*: Nissan Anti-Theft System (Nissan Vehicle Immobilizer System)
1 : Instrument driver lower panel
SAIA1557E
Diagnostic test
modeFunction
ENGINE
A/T
ABS (Including TCS)
ABS (Including VDC)
AIR BAG
BCM
METER A/C AMP
NATS(NVIS) *
AIR PRESSURE MONITOR
IPDM E/R
Work supportThis mode enables a technician to adjust some devices faster
and more accurately by following the indications on CONSULT-
II.x- -x- x - - x -
Self-diagnostic
resultsSelf-diagnostic results can be read and erased quickly. x x x x x x x x x x
Trouble diagnostic
recordCurrent self-diagnostic results and all trouble diagnostic
records previously stored can be read.----x-----
Data monitor Input/Output data in the ECU can be read. x x x x - x x - x x
CAN diagnosis
support monitorThe condition of CAN communication line can be read. x x x x - x x - - x
Active testDiagnostic Test Mode in which CONSULT-II drives some actua-
tors apart from the ECUs and also shifts some parameters in a
specified range.x-xx-x- - -x
DTC & SRT confir-
mationThe results of SRT (System Readiness Test) and the self-diag-
nosis status/result can be confirmed.x---------
DTC work supportThis mode enables a technician to monitor the status/results of
self-diagnosis performed by the ECU.-x--------
ECU (ECM/TCM)
part numberECU (ECM/TCM) part number can be read. x x x x - - - - x -
ECU discriminated
No.Classification number of a replacement ECU can be read to
prevent an incorrect ECU from being installed.----x-----
Function testThis mode can show results of self-diagnosis of ECU with
either ‘OK’ or ‘NG’. For engines, more practical tests regarding
sensors/switches and/or actuators are available.xxxxx-----
Control unit initial-
izationAll registered ignition key IDs in NATS components can be ini-
tialized and new IDs can be registered.---- - - -x - -

CONSULT-III/GST CHECKING SYSTEM
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CONSULT-III Data Link Connector (DLC) CircuitNAS000A5
INSPECTION PROCEDURE
If the CONSULT-III cannot diagnose the system properly, check the following items.
NOTE:
The DDL1 and DDL2 circuits from DLC pins 12, 13, 14 and 15 may be connected to more than one system. A short in a DDL circuit con-
nected to a control unit in one system may affect CONSULT-III access to other systems.Symptom Check item
CONSULT-III cannot access
any system.

CONSULT-III DLC power supply circuit (Terminal 8) and ground circuit (Terminal 4)
CONSULT-III cannot access
individual system. (Other sys-
tems 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-III DLC (For detailed circuit, refer to
wiring diagram for each system.)

Open or short circuit CAN communication line. Refer to LAN-16, "Trouble Diagnosis Flow Chart"
.

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CONSULT-III/GST CHECKING SYSTEM
Revision: 2006 November2007 350Z
CIRCUIT DIAGRAM
TAWT0053E

LIFTING POINT
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LIFTING POINTPFP:00000
Commercial Service Tools NAS0000U
CAUTION:

Every time the vehicle is lifted up, maintain the complete vehicle curb condition.

Since the vehicle's center of gravity changes when removing main parts on the front side (engine,
transmission, suspension etc.), support a jack up point on the rear side garage jack with a mission
jack or equivalent.

Since the vehicle's center of gravity changes when removing main parts on the rear side (rear axle,
suspension, etc.), support a jack up point on the front side garage jack with a mission jack or
equivalent.

Be careful not to smash or do not do anything that would affect piping parts.
Garage Jack and Safety Stand NAS0000V
WARNING:

Park the vehicle on a level surface when using the jack. Make sure to avoid damaging pipes,
tubes, etc. under the vehicle.

Never get under the vehicle while it is supported only by the jack. Always use safety stands when
you have to get under the vehicle.

Place wheel chocks at both front and back of the wheels on the ground.
Tool name Description
Board on attachment
Safety stand attachment
S-NT001
S-NT002

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LIFTING POINT
Revision: 2006 November2007 350Z
2-Pole Lift NAS0000W
WARNING:
When lifting the vehicle, open the lift arms as wide as possible and ensure that the front and rear of
the vehicle are well balanced.
When setting the lift arm, do not allow the arm to contact the brake tubes, brake cable, fuel lines and
sill spoiler.
PIIB7446E
PAIA0062E