Suzuki Swift Sport 2004 Service & Repair Manual page 215

Step
4 ECM voltage check
1) Disconnect connector from APP sensor with ignition
switch turned OFF.
2) Check for proper connection to APP sensor at "RED",
"YEL" and "WHT" wire terminals.
"RED"
3) If OK, measure voltage between "RED" wire terminal of
APP sensor connector and vehicle body ground with
ignition switch turned ON.
Is voltage 4 – 6 V?
5 ECM voltage 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 "E23-
34" terminal.
4) If OK, measure voltage between "E23-34" terminal of
ECM connector and engine ground with ignition switch
turned ON.
Is voltage 4 – 6 V?
6 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "E23-34" terminal of ECM
connector and engine ground.
Is resistance infinity?
7 Wire harness check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Check for proper connection of ECM connector at "E23-
36", "E23-52" and "E23-51" terminals.
3) If OK, measure resistance between "YEL" wire terminal
of APP sensor connector and vehicle body ground.
Is resistance infinity?
8 Wire harness check
1) Measure resistance between "E23-36" and each "E23-
52", "E23-51", "E23-50" terminals of ECM connector with
ignition switch turned OFF.
Is each resistance infinity?
9 Wire harness check
1) Measure resistance between "YEL" wire terminal of APP
sensor connector and "E23-36" terminal of ECM
connector with ignition switch turned OFF.
Is resistance below 5
Action
"BRN"
"YEL"
"BLU"
"WHT"
"GRN"
Ω
?
Engine General Information and Diagnosis:
Yes
Go to Step 7.
I4RS0B110048-01
"RED" wire is open or
high resistance circuit.
Substitute a known-
good ECM and recheck.
Go to Step 8.
Go to Step 9.
Go to Step 10.
1A-165
No
Go to Step 5.
Go to Step 6.
"RED" wire is shorted to
ground circuit.
"YEL" wire is shorted to
ground circuit.
"YEL" wire is shorted to
"BLU" wire and/or
"WHT" wire and/or
"E23-50" circuit.
"YEL" wire is open or
high resistance circuit.