Suzuki Wagon R Manual page 3042

Step
7 Check MAP sensor signal circuit.
1) Disconnect connectors from ECM with igni-
tion switch turn OFF.
2) Turn ON ignition switch.
3) Measure voltage between "LT GRN/RED"
wire terminal in MAP sensor harness con-
nector and engine ground.
Is voltage 0 V?
8 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?
DTC P0601 Internal Control Module Memory Check Sum Error
DTC P0602 Control Module Programming Error
System Description
Internal control module is installed in ECM.
DTC Detecting Condition and Trouble Area
DTC Detecting Condition
Data write error or check sum error
DTC Confirmation Procedure
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ON ignition switch and clear DTC, pending DTC and freeze frame data by using scan tool.
3) Start engine and run it at idle if possible.
4) Check DTC and pending DTC by using scan tool.
Troubleshooting
Substitute a known-good ECM and recheck.
ENGINE GENERAL INFORMATION AND DIAGNOSIS (M13 ENGINE) 6-2-143
Action
[A]: Fig. 1 for Step 3
Yes
Go to Step 8.
Substitute a known-good
ECM and recheck.
Trouble Area
ECM
No
"LT GRN/RED" wire
shorted to power supply
or other circuit.
Faulty MAP sensor.