Electrical Circuit Inspection Procedure - Suzuki TU250X Service Manual

4-6 FI SYSTEM DIAGNOSIS
• Never connect any tester (voltmeter, ohmmeter, or whatever)
to the ECM when its coupler is disconnected.
Otherwise, damage to ECM may result.
• Never connect an ohmmeter to the ECM with its coupler con-
nected. If attempted, damage to ECM or sensors may result.
• Be sure to use a specified voltmeter/ohmmeter. Otherwise,
accurate measurements may not be obtained and personal
injury may result.
ELECTRICAL CIRCUIT INSPECTION
PROCEDURE
While there are various methods for electrical circuit inspection,
described here is a general method to check for open and short
circuit using an ohmmeter and a voltmeter.
OPEN CIRCUIT CHECK
Possible causes for the open circuits are as follows. As the
cause can exist in the connector/coupler or terminal, they need
to be checked carefully.
• Loose connection of connector/coupler.
• Poor contact of terminal (due to dirt, corrosion or rust, poor
contact tension, entry of foreign object etc.).
• Wire harness being open.
• Poor terminal-to-wire connection.
• Disconnect the negative cable from the battery.
• Check each connector/coupler at both ends of the circuit
being checked for loose connection. Also check for condition
of the coupler lock if equipped.
• Using a test male terminal, check the female terminals of the
circuit being checked for contact tension.
Check each terminal visually for poor contact (possibly
caused by dirt, corrosion, rust, entry of foreign object, etc.). At
the same time, check to make sure that each terminal is fully
inserted in the coupler and locked.
If contact tension is not enough, rectify the contact to increase
tension or replace.
The terminals must be clean and free of any foreign material
which could impede proper terminal contact.
1 Sensor
2 ECM
*1 Check for loose connection.
*1 Check contact tension by insert-
ing and removing.
*2 Check each terminal for bend
and proper alignment.
*1
*1
*1
*2