Suzuki SX4 Service Manual page 207

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Step
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 "E01-
34" terminal.
4) If OK, measure voltage between "E01-34" 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 "E01-34" 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 "E01-
36", "E01-52" and "E01-51" terminals.
3) If OK, measure resistance between "YEL" wire terminal
of APP sensor assembly connector and vehicle body
ground.
Is resistance infinity?
8
Wire harness check
1) Measure resistance between "E01-36" and each "E01-
52", "E01-51", "E01-50" 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 assembly connector and "E01-36" terminal of
ECM connector with ignition switch turned OFF.
Is resistance below 5
10 APP sensor assembly check
1) Check APP sensor (sub) referring to "Accelerator Pedal
Position (APP) Sensor Assembly Inspection in Section
1C".
Is output voltage within specified value?
Action
?
Engine General Information and Diagnosis:
Yes
"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.
Substitute a known-
good ECM and recheck.
1A-157
No
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
"E01-50" circuit.
"YEL" wire is open or
high resistance circuit.
Replace APP sensor
assembly.

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