B Troubleshooting - Toyota Celica Supra 1982 Electrical Wiring Diagram

B TROUBLESHOOTING
Troubleshooting Procedure
1. Determine what is wrong with the system.
2. First read the diagram so you understand the system. Refer to the component operation boxed
within the system circu it.
3. Locate the cause of the problem.
a. Determine whether the problem is with the common circuit (power source or ground) or
individual circuit.
Check other loads or switches which are in parallel with the problem component.
If they are normal, the problem lies within the particular system itself.
Refer to the POWER SOURCE or GROUND POINTS and check the related systems.
(NOTE: Each component is grounded at 2 or 3 points.)
If the related systems are normal, the common circuit (power source or ground points) is okay.
The problem lies within the indiVjdual system.
b. Locate the exact point of the problem by narrowing down the flrea with a voltmeter or test
lamp.
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4. Repair and re-check the circuit.
If any wiring was disconnected for troubleshooting, re-connect it and check the related circuits.
Voltage Check
1. Establish conditions in which voltage is present
at the check point.
IRefer to component operations.)
Example:
® -
Ignition SIW on
® -
Ignition SIW and SIW 1 on
© -
IgnitionSIW, SIW 1 and Relay on
(SIW 2 off)
2. Using a voltmeter, ·connect the negative lead to
a good ground point or negative battery ter-
minal and the positive lead to the connector or
component terminal. This check can be done
with a test lamp instead of a voltmeter.
To Ignitio;o 8/W
IG Terminal
!
fuse
®
81W 1
®
Relay
©
~'[11
'--+-.....
Solenoid
Voltmeter
0"