Suzuki SX4 Service Manual page 123

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Step
3
MAP sensor power supply voltage check
1) Disconnect connector from MAP sensor with ignition
switch turned OFF.
2) Check for proper connection of MAP sensor at "GRY/
RED", "RED/BLK" and "GRY/BLU" wire terminals.
3) Turn ON ignition switch, measure voltage between
engine ground and "GRY/RED" wire terminal of MAP
sensor connector.
Is voltage 4 – 6 V?
4
MAP sensor power supply circuit check
1) Disconnect connectors from A/C refrigerant pressure
sensor (if equipped with A/C) with ignition switch turned
OFF.
2) Turn ON ignition switch, measure voltage between
engine ground and "GRY/RED" wire terminal of MAP
sensor connector.
Is voltage 4 – 6 V?
5
MAP sensor ground circuit check
1) Measure resistance between "GRY/BLU" wire terminal
of MAP sensor connector and engine ground with
ignition switch turned OFF.
Is resistance below 5
6
Ground circuit check
1) Measure resistance between "C01-55" terminal of ECM
connector and vehicle body ground.
Is resistance below 5
7
MAP sensor signal circuit check
1) Turn ON ignition switch.
2) Measure voltage between "RED/BLK" wire terminal of
MAP sensor connector and engine ground.
Is voltage 4 – 6 V?
8
MAP sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "RED/BLK" wire terminal of
MAP sensor connector and "C01-53" terminal of ECM
connector.
Is resistance below 2
Action
?
?
?
Engine General Information and Diagnosis:
Yes
Go to Step 5.
I5RW0A110021-01
Faulty A/C refrigerant
pressure sensor (if
equipped with A/C).
Go to Step 7.
"GRY/BLU" wire is open
or high resistance
circuit.
Go to Step 9.
"RED/BLK" wire is
shorted to power supply
circuit.
1A-73
No
Go to Step 4.
"GRY/RED" wire is open
or shorted to power
circuit.
Go to Step 6.
ECM grounds "C01-58",
"C01-15", "C01-30" and/
or "E01-31" circuit are
open or high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
Go to Step 8.
"RED/BLK" wire is open
or high resistance
circuit.

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