Dtc B1510 (No.10): Engine Coolant Temperature (Ect) Sensor And/Or Its Circuit Malfunction - Suzuki Liana RH413 Service Manual

Step
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?
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
5 1) Check resistance between "YEL" wire terminal and body
ground.
Is resistance more than 1 M
6 1) Check resistance between "PNK" wire terminal and
"YEL" wire terminal.
Is resistance more than 1 M
7 1) Check sunload sensor referring to "Sunload Sensor
Inspection".
Is sunload sensor normal?

DTC B1510 (No.10): Engine Coolant Temperature (ECT) Sensor and/or its Circuit Malfunction

Wiring Diagram
2
G03-9
1. HVAC control module
DTC Detecting Condition and 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.)
Action
Ω
?
Ω
?
Ω
?
YEL/GRN G77-24
2. ECM
DTC Detecting Condition
Air Conditioning System: Automatic Type 7B-58
Go to Step 6.
Go to Step 5.
Poor connection of
"YEL" wire terminal at
HVAC control module
connector, and/or HVAC
control module faulty.
Go to Step 7.
HVAC control module
faulty.
1
12V
3. HVAC control module connector "G77" (viewed from harness side)
Yes
Go to Step 4.
"YEL/BLK" wire open or
high resistance.
"YEL" wire shorted to
ground.
"PNK" wire shorted to
"YEL" wire.
Sunload sensor faulty.
3
24
Trouble Area
• "YEL/GRN" wire faulty
• Engine coolant temperature (ECT)
sensor faulty
• HVAC control module faulty
• ECM faulty
No
S3RH0A7224015
I3RH0A722011-01