Suzuki Grand Vitara 2011 Manual page 159

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/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 ground circuit check
1) Measure resistance between "GRY/GRN" wire terminal
of MAP sensor connector and engine ground with
ignition switch turned OFF.
Is resistance below 3
5 Ground circuit check
1) Measure resistance between "C37-57" terminal of ECM
connector and vehicle body ground.
Is resistance below 3
6 MAP sensor signal circuit check
1) Turn ON ignition switch.
2) Measure voltage between "RED/WHT" wire terminal of
MAP sensor connector and engine ground.
Is voltage 4 – 6 V?
7 MAP sensor signal circuit check
1) Disconnect connectors from ECM with ignition switch
turned OFF.
2) Measure resistance between "RED/WHT" wire terminal
of MAP sensor connector and "C37-55" terminal of ECM
connector.
Is resistance below 2
8 MAP sensor output signal check
1) Check MAP sensor according to "Manifold Absolute
Pressure (MAP) Sensor Inspection: For Petrol Engine
Model in Section 1C".
Is it in good condition?
Engine General Information and Diagnosis: For Petrol Engine Model 1A-90
Action
Ω
?
Ω
?
Ω
?
Yes
Go to Step 4.
I5JB0A110035-01
Go to Step 6.
"GRY/GRN" wire is
open or high resistance
circuit.
Go to Step 8.
"RED/WHT" wire is
shorted to power supply
circuit.
Substitute a known-
good ECM and recheck.
No
"GRY/RED" wire
shorted to power circuit.
Go to Step 5.
ECM grounds "C37-58",
"C37-48", "C37-30",
"C37-29" and/or "C37-
15" circuit are open or
high resistance.
If wires are OK,
substitute a known-
good ECM and recheck.
Go to Step 7.
"RED/WHT" wire is
open or high resistance
circuit.
Faulty MAP sensor.