Suzuki Swift Sport 2004 Service & Repair Manual page 137

Step
6 Wire harness check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors
connected.
3) Check for proper connection of ECM connector at "C37-
43" and "C37-54" terminals.
4) If OK, measure voltage between "C37-54" terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 4 -6 V?
7 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "GRN" and "RED" wire
terminals of electric throttle body connector.
Is resistance infinity?
8 Wire harness check
1) Turn ON ignition switch.
2) Measure voltage between "C37-54" terminal of ECM
connector and engine ground.
Is voltage 0 V?
9 Ground circuit check
1) Turn OFF ignition switch.
2) Measure resistance between "BLK" wire terminal of
electric throttle body connector and engine ground.
Is resistance below 5
10 Ground circuit check
1) Remove ECM from its bracket with ECM connectors
connected.
2) Check for proper connection of ECM connector at "C37-
42" terminal.
3) Measure resistance between "C37-42" terminal of ECM
connector and engine ground with ignition switch turned
OFF.
Is resistance below 5
11 Electric throttle body check
1) Check TP sensor referring to "Throttle Position Sensor
Performance Check" under "Electric Throttle Body
Assembly On-Vehicle Inspection in Section 1C".
Is output voltage within specified value?
Action
Ω
?
Ω
?
Engine General Information and Diagnosis:
Yes
"GRN" wire is open or
high resistance circuit.
Go to Step 8.
Substitute a known-
good ECM and recheck.
Go to Step 11.
"BLK" wire is open or
high resistance circuit.
Substitute a known-
good ECM and recheck.
1A-87
No
Go to Step 7.
"GRN" wire is shorted to
"RED" wire.
"GRN" wire is shorted to
power circuit.
Go to Step 10.
Faulty ECM ground
circuit. If circuit is OK,
substitute a known-
good ECM and recheck.
Replace electric throttle
body.