Suzuki Grand Vitara Service Manual page 88

1A-81 Engine General Information and Diagnosis:
DTC Troubleshooting
NOTE
Before this trouble shooting 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/WHT" and "GRY/GRN" 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 ECM with ignition switch
turned OFF.
2) Measure resistance between "GRY/RED" wire terminal
of MAP sensor connector and "C37-14" terminal of ECM
connector.
Is resistance below 3
5 MAP sensor signal circuit check
1) Connect connectors to ECM with ignition switch turned
OFF.
2) Measure voltage between "RED/WHT" wire terminal of
MAP sensor connector and engine ground with ignition
switch turned ON.
Is voltage 4 – 6 V?
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Action
Ω
?
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Yes
Go to Step 2.
Go to Step 3.
Go to Step 5.
I5JB0A110035-01
Go to Step 5.
Go to Step 7.
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 open
circuit.
Go to Step 6.