INFINITI FX35 2008 Service Manual

SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-29
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 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 wir e. 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. Veri fy battery voltage at the battery + side of the fuse ter-
minal (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).
no voltage; short is further down the circuit than SW1.
 With SW1 closed, relay and solenoid disconnected and t he 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 oper ation 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 re sistance 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.
SGI847-A
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GI-30
< SERVICE INFORMATION >
SERVICE INFORMATION FOR ELECTRICAL INCIDENT
 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 thewires 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, re fer 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 resist ance with DMM, contact by a single strand of wire will
give reading of 0 ohms. This would indicate a good circui t. 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 ci rcuit 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
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SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-31
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Note in the illustration that there is an excessi ve 4.1 volt drop between the battery and the bulb.
MEASURING VOLTAGE DRO P — STEP-BY-STEP
The step-by-step method is most useful for isolating ex cessive 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 oper ations 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.
INPUT-OUTPUT VOLTAGE CHART
SGI974
SAIA0258E
MGI034A
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GI-32
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
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 ligh t 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. Cont rol 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 u p the lamp.
Control Units and Electrical PartsINFOID:0000000001325673
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 hit- ting 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 vehi-
cle.
 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.
Pin
No. Item Condition
Vo l ta g e
value [V] In case of high resistance such as single strand [V] *
1Switch Switch ON Battery voltage Lower than battery voltage Approx. 8 (Example)
Switch OFF Approx. 0 Approx. 0
2Lamp Switch ON Battery voltage App
rox. 0 (Inoperative lamp)
Switch OFF Approx. 0 Approx. 0
MGI035A
Pin
No. Item Condition
Vo l ta g e
value [V] In case of high resistance such as single strand [V] *
1Lamp Switch ON Approx. 0 Battery voltage (Inoperative lamp)
Switch OFF Battery voltage Battery voltage
2Switch Switch ON Approx. 0 Higher than 0 Approx. 4 (Example)
Switch OFF Approx. 5 Approx. 5
SAIA0255E
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SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-33
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 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.
SEF348N
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GI-34
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CONSULT-III/GST CHECKING SYSTEM
CONSULT-III/GST CHECKING SYSTEM
DescriptionINFOID:0000000001572193
 When CONSULT-III/GST is connected with a data link connector
(A) equipped on the vehicle side, it will communicate with the con-
trol unit equipped in the vehicle and then enable various kinds of
diagnostic tests.
 Refer to CONSULT-III Operation Manual for more information.
CONSULT-III Function a nd System Application*1INFOID:0000000001572194
x: Applicable
*1: If GST application is eq uipped, functions in accordance with SAE J1979 and ISO 15031-5 can be used.
1 : Instrument driver lower panel
JPAIA0066ZZ
Diagnostic test
mode Function
ENGINE
A/T
AIR BAG
REARVIEW CAMERA
METER A/C AMP BCM
AUTO DRIVE POS.
ABS (Including VDC) IPDM E/R
ICC
ALL MODE AWD/4WD INTELLIGENT KEY LDW
Work support This mode enables a technician to adjust some devices faster
and more accurately by following the indications on CON-
SULT-III. xx - x - xxx- x- xx
Self-diagnostic re-
sults Self-diagnostic results can be read and erased quickly. xxx - xxxxxxxxx
Trouble diagnos-
tic record Current 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. xx - xxxxxxxxxx
CAN diagnosis
support monitor The condition of CAN communication line can be read. xx- - xxxxxxxxx
Active test Diagnostic Test Mode in whic
h CONSULT-III drives some ac-
tuators apart from the ECUs and also shifts some parameters
in a specified range. x- -- - xxxxxxxx
DTC & SRT con-
firmation The results of SRT (System Readiness Test) and the self-di-
agnosis status/result can be confirmed.
x- -- ---------
DTC work support This mode enables a technician to monitor the status/results
of self-diagnosis performed by the ECU. xx-- ---------
ECU (ECM/TCM)
part number ECU (ECM/TCM) part number can be read. x x - x - x x x - x x x x
ECU discriminat-
ed No. Classification number of a replacement ECU can be read to
prevent an incorrect ECU from being installed.
-- x- ---------
Function test This mode can show results of self-diagnosis of ECU with ei-
ther 'OK' or 'NG'. For engines, more practical tests regarding
sensors/switches and/or actuators are available.
xxx- ---x-----
Configuration — -----x------ -
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CONSULT-III/GST CHECKING SYSTEMGI-35
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CONSULT-III/GST Data Link Connector (DLC) CircuitINFOID:0000000001572195
INSPECTION PROCEDURE
If the CONSULT-III/GST 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 connected to a control unit in one system may affect CONSULT-III access to other sys-
tems.
If the GST cannot operate properly, check the circuit based on the information of SAE J1962 and ISO 15031-
3.
Symptom Check item
CONSULT-III/GST cannot ac-
cess any system.  CONSULT-III/GST DLC power supply circuit (Terminal 8 and 16) and ground circuit (Terminal 4 and
5)
CONSULT-III cannot access in-
dividual 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-14, "
Trouble Diagnosis Flow Chart".
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
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GI-36
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CONSULT-III/GST CHECKING SYSTEM
Wiring Diagram - CONSULT-I II/GST CHECKING SYSTEM -
INFOID:0000000001572196
TAWM0074E
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LIFTING POINTGI-37
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O PLIFTING POINT
Commercial Service ToolINFOID:0000000001325680
CAUTION:
 Every time the vehicle is lifted up, main tain 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 poi nt 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 fr ont side garage jack with a mission jack or equiv-
alent.
 Be careful not to smash or do not do an ything that would affect piping parts.
Garage Jack and Safety StandINFOID:0000000001325681
WARNING:
 Park the vehicle on a level surface when using th e 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.
Tool name Description
Board on attachment
Safety stand attachment
S-NT001
S-NT002
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

GI-38
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LIFTING POINT
 Place wheel chocks at both front and back of the wheels on the ground.
CAUTION:
There is canister just behind Garage jack point rear. Jack up be carefully.
2-Pole LiftINFOID:0000000001325682
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 no t allow the arm to contact the brake tubes, brake cable, fuel lines and
sill spoiler.
Board-On LiftINFOID:0000000001325683
CAUTION: Make sure vehicle is empty when lifting.
PIIB8452E
PAIA0096E
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3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C