Suzuki Liana RH413, Service Manual

Page: 897 / 1302

Air Conditioning System: Automatic Type 7B-58
DTC B1510 (No.10): Engine Coolant Temperature (ECT) Sensor and/or its Circuit Malfunction
S3RH0A7224015
Wiring Diagram
DTC Detecting Condition and Trouble Area
3 1) With ignition switch ON position and HVAC control
module connector connected, check voltage between
“YEL” wire terminal at sunload sensor connector and
body ground.
Is voltage about 5 V?
Go to Step 6. Go to Step 4.
4 1) Turn ignition switch OFF, and then disconnect HVAC
control module connector.
2) Check resistance between “YEL” wire terminal at
sunload sensor connector and “YEL” wire terminal at
HVAC control module connector.
Is resistance less than 1 M
Ω
?
Go to Step 5. “YEL/BLK” wire open or
high resistance.
5 1) Check resistance between “YEL” wire terminal and body
ground.
Is resistance more than 1 M
Ω
?
Poor connection of
“YEL” wire terminal at
HVAC control module
connector, and/or HVAC
control module faulty. “YEL” wire shorted to
ground.
6 1) Check resistance between “PNK” wire terminal and
“YEL” wire terminal.
Is resistance more than 1 M
Ω
?
Go to Step 7. “PNK” wire shorted to
“YEL” wire.
7 1) Check sunload sensor referring to “Sunload Sensor
Inspection”.
Is sunload sensor normal?
HVAC control module
faulty. Sunload sensor faulty.
Step Action Yes No
12V
YEL/GRN
G77-24 G03-9
2
1
3
24
I3RH0A722011-01
1. HVAC control module 2. ECM 3. HVAC control module connector “G77” (viewed from harness side)
DTC Detecting Condition Trouble Area
• Engine coolant temperature signal from ECM is less than the specified
(5.0 V). (Engine coolant temperature is less than –26
°
C, –14.8
°
F.)
• Engine coolant temperature signal from ECM is more than the specified
(5.0 V). (Engine coolant temperature is more than 112
°
C, 233.6
°
F.)
• “YEL/GRN” wire faulty
• Engine coolant temperature (ECT)
sensor faulty
• HVAC control module faulty
• ECM faulty