Suzuki 2006 GSF1200AK6 Supplementary Service Manual page 65

64 GSF1200AK6/SAK6 ('06-MODEL)
DTC "48" (C1648): Supply voltage (Decreased)
POSSIBLE CAUSE
• Faulty alternator
• Faulty battery
• Faulty wire harness, etc.
Step 1
1) Remove the seat. (!GSF1200K6/SK6 9D-5)
2) Measure the voltage between the + and - battery terminals
using the multi-circuit tester.
% Battery voltage: 12.0 V and more
" 09900-25008: Multi-circuit tester set
& Tester knob indication: Voltage (')
Is the voltage over 12 V?
YES Go to step 2.
NO Charge or replace the battery.
Step 2
1) Run the engine at 5 000 r/min with the dimmer switch set to
HI.
2) Measure the voltage between the + and - battery termi-
nals.
% Regulated voltage: 13.5 – 15.0 V at 5 000 r/min
& Tester knob indication: Voltage (')
Is the voltage 13.5 – 15.0 V?
YES Go to step 3.
Inspect the generator
NO
(!GSF1200K6/SK6 1J-10)
Step 3
1) Turn the ignition switch to OFF.
2) Remove the left frame cover. (!GSF1200K6/SK6 9D-5)
3) Remove the fuse box mounting bolt. (!Page 28)
4) Check the ABS control unit coupler for loose or poor con-
tacts. If OK, then disconnect the ABS control unit coupler.
5) Run the engine at 5 000 r/min with the dimmer switch set to
HI.
6) Measure the voltage between F (O/Y) and N (B/W) at the
coupler.
& Tester knob indication: Voltage (')
Is the voltage same as step 2 above?
YES Replace the ABS control unit/HU.
Inspect the wire harness. (Faulty ignition or
NO
ground wire)
ABS control unit coupler (Harness end)