Suzuki 2006 SX4, Service Manual

Page: 193 / 1478

Engine General Information and Diagnosis: 1A-149
Circuit Description
When the ignition switch is turned ON, the main relay turns ON (the contact point closes) and the main power is
supplied to ECM. And then ECM supplies 5 V power to each sensor (A/C refrigerant pressure sensor, APP sensor and
TP sensor).
If 5 V power circuit to each sensors from ECM is shorted to ground, ECM stops engine and emission control operation.
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection”.
• 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 Action Yes No
1 Circuit fuse check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection to ECM connector at “E01-
2”, “E01-29”, “E01-60”, “E01-1”, “E01-16”, “C01-15”,
“C01-30”, “C01-29”, “C01-48” and “C01-58” terminals.
3) If OK, check “DOME” fuse and “IG COIL” fuse for
blowing.
Are “DOME” fuse and “IG COIL” fuse in good condition?
Go to Step 2. Replace fuse (s) and
check for short in
circuits connected to
fuse(s).
2 Power supply circuit check
1) Measure voltage between “E01-2” terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 3. “WHT/RED” wire is
open circuit.
3 Ignition signal check
1) Turn ignition switch to ON position.
2) Measure voltage between “E01-29” terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 4. “BLK/WHT” or “GRN”
wire is open circuit.
4 Main relay circuit check
1) Turn ignition switch to OFF position.
2) Check “FI” fuse (1) (15 A) in fuse box No.2 for blowing.
3) If OK, measure voltage between “E01-60” terminal of
ECM connector and body ground.
Is voltage 10 – 14 V?
Go to Step 5. Go to Step 9.
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