Dtc B1503: Evaporator Temperature Sensor Circuit Malfunction - Suzuki 2006 SX4 Service Manual

DTC B1503: Evaporator Temperature Sensor Circuit Malfunction

Wiring Diagram
2 [S]
WHT/BLK G20-9
ORN
3
[S]: Evaporator temperature sensor signal circuit
[G]: Evaporator temperature sensor ground circuit
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, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
Step
1 Was "Air Conditioning System Check" performed?
2 Wire harness check
1) Turn ignition switch to OFF position.
2) Disconnect connectors from evaporator temperature
sensor and HVAC control module.
3) Check for proper connection to each signal circuit
terminal and ground circuit terminal of evaporator
temperature sensor and HVAC control module
connectors.
4) If OK, check that evaporator temperature sensor circuit
is as follows.
• Wiring harness resistance of each evaporator
temperature sensor signal circuit and ground circuit is
less than 3 Ω
• Insulation resistance between evaporator temperature
sensor signal circuit and vehicle body ground is
Infinity
• Circuit voltage of each evaporator temperature sensor
signal circuit and ground circuit is 0 - 1 V with ignition
switch turned ON
Are they good condition?
1
5V
14
30
ORN G20-24
[G]
DTC Detecting Condition
Action
Air Conditioning System: Automatic Type 7B-59
G20
13 12 11 10 9 8
29 28 27 26 25 24 23
1. HVAC control module
2. Evaporator temperature sensor
Go to Step 2.
Go to Step 3.
7 6 5 4 3 2
22 21 20 19 18 17 16
3. To other sensors
Trouble Area
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
Yes
Go to "Air Conditioning
System Check".
Evaporator temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.
S6RW0D7224011
1
15
I7RW01722005-01
No