Suzuki Wagon R Plus RB310, Service Manual

Page: 315 / 846

6-2-140 ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE)
8 Check MAP sensor signal circuit.
1) Turn ON ignition switch.
2) Measure voltage between “LT GRN/RED”
wire terminal in MAP sensor harness con-
nector and engine ground.
Is voltage 4 – 5 V?
Go to Step 11. Go to Step 9.
9 Check MAP sensor signal circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure resistance between “E22-15” ter-
minal and vehicle body ground.
Is resistance infinity?
Go to Step 10. “LT GRN/RED” wire
shorted to ground circuit.
10 Check MAP sensor signal circuit.
1) Measure resistance between “LT GRN/
RED” wire terminal in MAP sensor harness
connector and “E22-15” terminal in ECM
connector.
Is resistance below 5
Ω
?
Go to Step 12. “LT GRN/RED” wire in
open or high resistance
circuit.
11 Check MAP sensor signal circuit.
1) Disconnect connectors from ECM with igni-
tion switch turned OFF.
2) Measure voltage between “LT GRN/RED”
wire terminal of MAP sensor connector and
engine ground with ignition switch turned
ON.
Is voltage 4 – 5 V?
“LT GRN/RED” wire
shorted to other circuit Go to Step 12.
12 Check MAP sensor output signal.
1) Check MAP sensor according to “Manifold
Absolute Pressure Sensor (MAP Sensor)
Inspection” in Section 6E2.
Is it in good condition?
Substitute a known-good
ECM and recheck. Faulty MAP sensor.
Step Action Yes No
[A]: Fig. 1 for Step 3