Suzuki GSX-R750, Service Manual

Page: 152 / 495

FI SYSTEM AND INTAKE AIR SYSTEM 4-5
ECM
'
Sensor
Check for loose connection
ECM
Check contact
tension by inserting
and removing.
Check each terminal
for bend and proper
alignment.
Looseness of crimping
Open
Thin wire (a few strands left)
ECM
• 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.
• Using continuity inspect or voltage check procedure as de-
scribed below, inspect the wire harness terminals for open cir-
cuit and poor connection. Locate abnormality, if any.
Continuity check
• Measure resistance across coupler
B
(between
A
and
C
in
the figure).
If no continuity is indicated (infinity or over limit), the circuit is
open between terminals
A
and
C
.
• Disconnect the coupler
B
and measure resistance between
couplers
A
and
B
.
If no continuity is indicated, the circuit is open between cou-
plers
A
and
B
. If continuity is indicated, there is an open cir-
cuit between couplers
B
’ and
C
or an abnormality in coupler
B
’ or coupler
C
.