Suzuki Swift Sport 2004 Service & Repair Manual page 999

DTC Detecting Condition and Trouble Area
Evaporator temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.
DTC Troubleshooting
NOTE
When DTC B1502, B1513 and B1514 are indicated together, it is possible that "ORN" wire circuit open.
Step
1 Evaporator temperature sensor signal circuit check
1) Disconnect evaporator temperature sensor connector.
2) Check for proper connection to evaporator temperature
sensor at "WHT/BLK" and "ORN" wire terminals.
3) If OK, measure voltage between "WHT/BLK" wire
terminal of evaporator temperature sensor connector
and vehicle body ground with ignition switch turned ON.
Is voltage 4 – 6 V?
2 Evaporator temperature sensor signal circuit check
1) Disconnect connector from HVAC control module with
ignition switch turned OFF.
2) Check for proper connection to HVAC control module
connector at "G52-4" and "G52-3" terminals.
3) If OK, measure resistance between "WHT/BLK" wire
terminal of evaporator temperature sensor connector
and "G52-4" terminal of HVAC control module connector.
Is resistance below 5
3 Evaporator temperature sensor signal circuit check
1) Measure resistance between "WHT/BLK" wire terminal
of evaporator temperature sensor connector and vehicle
body ground.
Is resistance infinity?
4 Evaporator temperature sensor signal circuit check
1) Measure voltage between "WHT/BLK" wire terminal of
evaporator temperature sensor connector and vehicle
body ground with ignition switch turned ON.
Is voltage 0 V?
5 Evaporator temperature sensor ground circuit check
1) Connect HVAC control module connector with ignition
switch turned OFF.
2) Measure resistance between "ORN" wire terminal of
evaporator temperature sensor connector and vehicle
body ground.
Is resistance below 5
6 Evaporator temperature sensor ground circuit check
1) Measure resistance between "G52-3" terminal of HVAC
control module connector and vehicle body ground.
Is resistance below 5
DTC Detecting Condition
Action
Ω
?
Ω
?
Ω
?
Air Conditioning System: Automatic Type 7B-51
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
Yes
Go to Step 5.
Go to Step 3.
Go to Step 4.
Go to Step 5.
Go to Step 7.
"ORN" wire open or high
resistance circuit.
Trouble Area
No
Go to Step 2.
"WHT/BLK" wire open
or high resistance
circuit.
"WHT/BLK" wire
shorted to ground
circuit.
"WHT/BLK" wire
shorted to other circuit.
Go to Step 6.
HVAC control module
faulty.