Suzuki Liana RH413, Service Manual

Page: 151 / 1302

Engine General Information and Diagnosis: 1A-100
DTC Troubleshooting (DTC P1451)
NOTE
Note that atmospheric pressure varies depending on weather conditions as well as altitude. Take that
into consideration when performing these check.
DTC P1500: Engine Starter Signal Circuit Malfunction
S3RH0A1104061
Step Action Yes No
1 Was “Engine and Emission Control System Check”
performed? Go to Step 2. Go to “Engine and
Emission Control
System Check”.
2 Barometric pressure sensor check
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON and select “DATA LIST” mode on
scan tool.
3) Check manifold absolute pressure.
Is it barometric pressure (approx. 100 kPa, 760 mmHg) at
sea level?
Go to Step 3. Substitute a known-
good ECM and recheck.
3 MAP sensor check
1) Remove MAP sensor from intake manifold and connect
vacuum pump gauge to MAP sensor.
2) Connect scan tool to DLC and turn ignition switch ON.
3) Check intake manifold absolute pressure displayed on
scan tool for specified value.
See the following table.
Is check result satisfactory?
Check air intake system
for air being drawn in
and engine
compression.
If OK, then substitute a
known-good ECM and
recheck. Replace MAP sensor.
I2RH0B110067-01
Applying vacuum Displayed value on scan tool
0
Barometric pressure
(Approx. 100 kPa, 760 mmHg)
27 kPa
200 mmHg
Barometric pressure – 27 kPa
(Approx. 73 kPa, 560 mmHg)
67 kPa
500 mmHg
Barometric pressure – 67 kPa
(Approx. 33 kPa, 260 mmHg)