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TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005612151
NISSAN LATIO 2010 Service Repair Manual TROUBLE DIAGNOSISBRC-47
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TROUBLE DIAGNOSIS
How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005612151](/manual-img/5/57358/w960_57358-936.png)
TROUBLE DIAGNOSISBRC-47
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How to Perform Trouble Diagnosis for Quick and Accurate RepairINFOID:0000000005612151
INTRODUCTION
The ABS/TCS/VDC system has an el ectronic control unit to control
major functions. The control unit accepts input signals from sensors
and controls actuator operation. It is also important to check for con-
ventional malfunctions such as air leaks in the booster or lines, lack
of brake fluid, or other malfunctions with the brake system.
It is much more difficult to diagnose a malfunction that occurs inter-
mittently rather than continuously. Most intermittent malfunctions are
caused by poor electrical connections or wiring. In this case, careful
checking of suspicious circuits may help prevent the replacement of
good parts.
A visual check only may not find t he cause of the malfunction, so a
road test should be performed.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an ABS/TCS/VDC complaint. The
customer is a very good source of information, especially for inter-
mittent malfunctions. Through the talks with the customer, find out
what symptoms are present and under what conditions they occur.
Start your diagnosis by looking fo r “conventional” malfunctions first.
This is one of the best ways to troubleshoot brake malfunctions on
an ABS/TCS/VDC equipped vehicle. Also check related Service Bul-
letins for information.
SEF233G
SEF234G
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WORK FLOW
CLARIFY CONCERN
ALFIA0011GB
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• A customer's description of a vehicle concern may vary depending on the individual. It is important to clarify the customer's concern.
• Ask the customer about what symptoms are present under what
conditions. Use this information to reproduce the symptom while
driving.
• It is also important to use the diagnosis sheet to understand what
type of trouble the customer is having.
EXAMPLE OF DIAGNOSIS SHEET
SBR339B
WFIA0097E
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Component Parts and Harn ess Connector Location
INFOID:0000000005612152
AWFIA0620GB
1. ABS actuator and electric unit (control
unit) E33 2. Stop lamp switch E13 3. Front wheel sensor LH E18
Front wheel sensor RH E117
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SchematicINFOID:0000000005612153
4. Yaw rate/side/decel G sensor B3 (driv- er seat and carpet removed for clarity) 5. Rear wheel sensor LH B123
Rear wheel sensor RH B122 6. VDC OFF switch M34
7. Steering angle sensor M64 (steering wheel removed for clarity) 8. Combination meter M24
ABFWA0108GB
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Wiring Diagram - VDC -
INFOID:0000000005612154
ABFWA0109GB
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ABFWA0110GB
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ABFWA0111GB
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