Suzuki SX4 Service Manual page 121

DTC Troubleshooting
NOTE
Before this troubleshooting is performed, read the precautions for DTC troubleshooting referring to
"Precautions for DTC Troubleshooting".
Step
1 Was "Engine and Emission Control System Check"
performed?
2 MAP sensor and its circuit check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ON ignition switch.
3) Check intake manifold pressure displayed on scan tool.
Is it 0 kPa (0 in.Hg)?
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 signal circuit check
1) Measure voltage between "RED/BLK" wire terminal of
MAP sensor connector and engine ground.
Is voltage 4 – 6 V?
6 MAP sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "C01-53" terminal of ECM
connector and vehicle body ground.
Is resistance infinity?
Action
I5RW0A110021-01
Engine General Information and Diagnosis:
Yes
Go to Step 2.
Go to Step 3.
Go to Step 5.
Faulty A/C refrigerant
pressure sensor (if
equipped with A/C).
Go to Step 7.
Go to Step 7.
1A-71
No
Go to "Engine and
Emission Control
System Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section
00".
Go to Step 4.
"GRY/RED" wire is
shorted to ground
circuit.
If wires are OK,
substitute a known-
good ECM and recheck.
Go to Step 6.
"RED/BLK" wire is
shorted to ground
circuit.