Suzuki Liana RH418, Supplementary Service Manual

Page: 62 / 371

1A-49 Engine General Information and Diagnosis:
DTC Troubleshooting
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 IAT sensor and its circuit
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake air temp. displayed on scan tool.
Is –40
°
C (–40
°
F) or 119
°
C (246
°
F) indicated?
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 IAT sensor connector with ignition switch
OFF.
2) Check for proper connection to IAT sensor at “LT GRN/
BLK” and “ORN” wire terminals.
3) If OK, then with ignition switch ON.
Is voltage applied to “LT GRN/BLK” wire terminal about 4 – 6
V?
Go to Step 5. “LT GRN/BLK” wire
open or shorted to
power, or poor “C41-15”
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
4 Does scan tool indicate –40
°
C (–40
°
F) at Step 2? Go to Step 6. Go to Step 5.
5 Check wire harness
1) Check intake air temp. displayed on scan tool with
ignition switch ON.
Is –40
°
C (–40
°
F) indicated?
Replace IAT sensor. “LT GRN/BLK” wire
shorted to ground.
If wire is OK, substitute
a known-good ECM and
recheck.
6 Check wire harness
1) Using service wire, connect IAT sensor connector
terminals.
2) Check intake air temp. displayed on scan tool with
ignition switch ON.
Is 119
°
C (246
°
F) indicated?
Replace IAT sensor. “LT GRN/BLK” wire
open or poor “C41-10”
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.
I2RH01110062-01
IYSY01111026-01