Suzuki Liana RH418, Supplementary Service Manual

Page: 60 / 371

1A-47 Engine General Information and Diagnosis:
DTC Confirmation Procedure
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode on scan tool and check DTC.
DTC Troubleshooting
NOTE
When battery voltage is applied to “GRY/RED” wire, it is possible that MAP sensor is also faulty.
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 Check MAP sensor and its circuit
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake manifold pressure.
Is it 114 kPa or more or 43 kPa or less?
Go to Step 3. Intermittent trouble.
Check for intermittent
referring to “Intermittent
and Poor Connection
Inspection in Section 00
in related manual”.
3 Check wire harness
1) Disconnect connector from MAP sensor with ignition
switch tuned OFF.
2) Check for proper connection of MAP sensor at “GRY/
RED” and “LT GRN/RED” wire terminals.
3) If OK, then with ignition switch ON, check voltage
between each of “GRY/RED” or “LT GRN/RED” wire
terminals and body ground.
Is voltage about 4 – 6 V at each terminal?
Go to Step 4. “GRY/RED” wire open
or shorted to ground
circuit or shorted to
power circuit (See
NOTE), “LT GRN/RED”
wire open or shorted to
ground, poor “C41-26”
connection or “C41-22”
connection. If wire and
connection are OK,
confirm that MAP
sensor is normal and
then substitute a known-
good ECM and recheck.
4 Check MAP sensor
1) Check MAP sensor referring to “Manifold Absolute
Pressure (MAP) Sensor Inspection in Section 1C in
related manual”.
Is it in good condition?
“GRY/RED” wire
shorted to “ORN” wire,
“LT GRN/RED” wire
open, poor “C41-10”
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck. Replace MAP sensor.
I2RH0B110023-01