7B-59 Air Conditioning System: Automatic Type
DTC B1503: Evaporator Temperature Sensor Circuit Malfunction
S6RW0C7224011
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
NOTE
When DTC B1502, B1504, B1511 and B1512 are indicated together, it is possible that sensor ground
circuit is open.
5V
G20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
24
23
22
25
26
27
28
29
30
ORN
ORN
WHT/BLK
G20-9
G20-24
[S]
[G]
2
3
1
I7RW01722005-01
[S]: Evaporator temperature sensor signal circuit
1. HVAC control module
3. To other sensors
[G]: Evaporator temperature sensor ground circuit
2. Evaporator temperature sensor
DTC Detecting Condition
Trouble Area
Evaporator temperature sensor signal voltage is higher than or lower than
specified value for specified time continuously.
• Evaporator temperature sensor
circuit
• Evaporator temperature sensor
• HVAC control module
Step
Action
Yes
No
1
Was “Air Conditioning System Check” performed?
Go to Step 2.
Go to “Air Conditioning
System Check”.
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?
Go to Step 3.
Evaporator temperature
sensor signal circuit
and/or ground circuit are
open, short or high
resistance.
Summary of Contents for 2006 SX4
Page 2: ......
Page 6: ......
Page 22: ...00 15 Precautions...
Page 38: ...0B 7 Maintenance and Lubrication...
Page 378: ...1K 6 Exhaust System...
Page 848: ...6C 46 Power Assisted Steering System...
Page 954: ...7B 89 Air Conditioning System Automatic Type...
Page 1086: ...8B 121 Air Bag System...
Page 1381: ...Paint Coatings 9L 7 I5RW0C9C0005 01 A Apply sealant 1 Hole...
Page 1382: ...9L 8 Paint Coatings I5RW0C9C0006 01 A Apply sealant covering flange end...
Page 1476: ...Prepared by 1st Ed Feb 2007...