Suzuki Liana RH418 Supplementary Service Manual page 62

1A-49 Engine General Information and Diagnosis:
DTC Troubleshooting
Step
1 Was "Engine and Emission Control System Check"
performed?
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
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?
4 Does scan tool indicate –40
5 Check wire harness
1) Check intake air temp. displayed on scan tool with
ignition switch ON.
° °
Is –40 C (–40 F) indicated?
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?
Action
° °
C (246 F) indicated?
I2RH01110062-01
° °
C (–40 F) at Step 2?
IYSY01111026-01
Yes
Go to Step 2.
Go to Step 3.
Go to Step 5.
Go to Step 6.
Replace IAT sensor.
Replace IAT sensor.
No
Go to "Engine and
Emission Control
System Check".
Intermittent trouble.
Check for intermittent
referring to "Intermittent
and Poor Connection
Inspection in Section 00
in related manual".
"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.
Go to Step 5.
"LT GRN/BLK" wire
shorted to ground.
If wire is OK, substitute
a known-good ECM and
recheck.
"LT GRN/BLK" wire
open or poor "C41-10"
connection.
If wire and connection
are OK, substitute a
known-good ECM and
recheck.