Suzuki AN400 Service Manual page 10

00-5 Precautions:
When checking system circuits including an electronic
control unit such as ECM, etc., it is important to perform
careful check, starting with items which are easier to
check.
1) Disconnect the (–) cable from the battery.
2) 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.
"A"
1
1. Sensor "A": Check for loose connection.
3) 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.
"B"
"B": Check contact tension by inserting and removing.
"C": Check each terminal for bend and proper alignment.
"A"
ECM
I705H1000005-02
"C"
I649G1000027-01
4) Using continuity inspect or voltage check procedures
as described below, inspect the wire harness
terminals for open circuit and poor connection.
Locate abnormality, if any.
"D"
"D": Looseness of crimping
"E": Open
"F": Thin wire (A few strands left)
Continuity check
1) Measure resistance across coupler "B" (between "A"
and "C" in figure).
If no continuity is indicated (infinity or over limit), the
circuit is open between terminals "A" and "C".
"A"
2) Disconnect the coupler "B" and measure resistance
between couplers "A" and "B-1".
If no continuity is indicated, the circuit is open
between couplers "A" and "B-1". If continuity is
indicated, there is an open circuit between couplers
"B-2" and "C" or an abnormality in coupler "B-2" or
coupler "C".
"A"
"F"
"E"
I649G1000028-01
"B"
ECM
"C"
I705H1000006-02
"B-2"
ECM
"C"
"B"
"B-1"
I705H1000010-02