Suzuki 2006 SX4 Service Manual page 100

1A-56 Engine General Information and Diagnosis:
Troubleshooting
NOTE
When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the special
tool to ECM and/or the ECM connectors referring to "Inspection of ECM and Its Circuits".
Step
1 MIL power supply check
1) Turn ignition switch to ON position.
Do other warning lights come ON?
2 DTC check in ECM
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch and check DTC in ECM.
Is there DTC(s) U0073 and/or U0121?
3 DTC check in BCM
1) Check DTC in BCM.
Is there DTC U0100?
4 CAN communication line circuit check
1) Check CAN communication line circuit between control
modules for open, short, high resistance and
connections referring to Step 5 to 10 under
"Troubleshooting for Communication Error with Scan
Tool Using CAN".
Is circuit in good condition?
5 "METER" fuse check
1) Turn ignition switch to OFF position.
2) Check for fuse blown at "METER" fuse in junction block.
Is "METER" fuse in good condition?
6 Combination meter power supply check
1) Remove combination meter referring to "Combination
Meter Removal and Installation in Section 9C".
2) Check for proper connection to combination meter
connector at "G241-31" and "G241-16" terminals.
3) If OK, then turn ignition switch to ON position and
measure voltage between combination meter connector
at "G241-31" terminal and vehicle body ground.
Is it 10 – 14 V?
7 Combination meter circuit check
1) Turn ignition switch to OFF position.
2) Measure resistance between "G241-16" terminal of
combination meter connector and vehicle body ground.
Ω
Is resistance 1 or less?
Action Yes
Go to Step 2.
Go to applicable DTC
diag. flow.
Go to applicable DTC
diag. flow.
Go to Step 5.
Go to Step 6.
Go to Step 7.
Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
No
Go to Step 4.
Go to Step 3.
Substitute a known-
good combination meter
and recheck. If MIL still
remains OFF, substitute
a known-good ECM and
recheck.
Repair or replace.
Replace "METER" fuse
and check for short.
"RED/BLK" wire is open
circuit.
"BLK" wire is open or
high resistance circuit.