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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 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 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:0000000005399853
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.
• If a connector is installed by tightening bolts, loosen bolt mounting
it, then take it out by hand.
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
SAIA0251E
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SERVICE INFORMATION FOR ELECTRICAL INCIDENTGI-33
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• Before installing a connector, make sure the terminal is not bent or damaged, and then correctly connect it.
When installing a connector by tightening bolts, fix it by tightening
the mounting bolt until the painted projection of the connector
becomes even with the surface.
• For removal of the lever type connector, pull the lever up to the direction pointed to by the arrow A in the figure, and then remove
the connector.
• For installation of the lever type connector, pull down the lever to the direction pointed by the arrow B in the figure, and then push
the connector until a clicking noise is heard.
• 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.
SAIA0252E
SAIA0253E
SAIA0254E
SAIA0255E
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GI-34
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SERVICE INFORMATION FOR ELECTRICAL INCIDENT
• When using a DMM, be careful not to let test probes get close toeach 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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CONSULT-III CHECKING SYSTEMGI-35
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O PCONSULT-III CHECKING SYSTEM
DescriptionINFOID:0000000005399854
• CONSULT-III is a hand-held type tester. When it is connected with a diagnostic connector equipped on the vehicle side, it will communicate with the contro l unit equipped in the vehicle and then enable various kinds
of diagnostic tests.
• Refer to CONSULT-III Operator's Manual for more information.
Function and System ApplicationINFOID:0000000005399855
x: Applicable.
*1: If equipped.
*2: With automatic transmission (A/T).
*3: With continuously variable transmission (CVT). Diagnostic test mode
Function
ENGINE
ABS*
1
AIR BAG EPS
IPDM E/R BCM
METER/M&A
INTELLIGENT KEY*
1
TRANSMISSION*
2
TRANSMISSION*
3
Work Support This mode enables a technician to adjust some devices faster and
more accurately by following indications on CONSULT-III. xx - - - x - - xx
Self Diagnostic Results Self-diagnostic results can be read and erased quickly. x x x x x x x x x x
Data Monitor Input/Output data in the ECU can be read. x x x x x x x x x x
CAN Diagnostic Support
Monitor The communication condition of CAN communication line can be
read.
xx - xxxxxxx
Active Test Diagnostic Test Mode in which CONSULT-III drives actuators apart
from ECU shifting some parameters in a specified range. xx - - xx - x - -
Function Test This 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. xxx - - - - - xx
DTC & SRT Confirmation The results of SRT (System Readiness Test) and the self-diagno-
sis status/result can be confirmed. x- - - - - - -x-
Ecu Identification ECM/ECU part number can be read. x x x x - x - x x x
Configuration Sets control module parameters to match vehicle options. - - - - - x - - - -
Special Function Other results or histories, etc that are recorded in ECU are dis-
played. --x------x
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GI-36
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CONSULT-III CHECKING SYSTEM
CONSULT-III Data Link Connector (DLC) Circuit
INFOID:0000000005399856
INSPECTION PROCEDURE
If the CONSULT-III cannot diagnose the syst em properly, check the following items.
ABAWA0039GB
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CONSULT-III CHECKING SYSTEMGI-37
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NOTE:
The DDL1 and DDL2 circuits from DLC pins 6, 7 and 14 may be connected to more than one system. A short
in a DDL circuit connected to a control unit in one syst em 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). For detailed cir-
cuit, refer to LAN-31, "
Wiring Diagram - CAN -".
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-31, "
Wiring Diagram - CAN -" .
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GI-38
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LIFTING POINT
LIFTING POINT
Special Service ToolINFOID:0000000005399857
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 equiv-
alent.
• Be careful not to smash or do not do an ything that would affect piping parts.
Garage Jack and Safety Stand and 2-Pole LiftINFOID:0000000005399858
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 an d back of the wheels on the ground.
• When lifting the vehicle, open the lift arms as wid e 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.
Tool number
Tool name Description
LM4086-0200
Board on attachment
LM4519-0000
Safety stand attachment
S-NT001
S-NT002
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