- The ignition switch is ON*1, the A/C is on and the flow sensor circuit has an open or short circuit.
- The ignition switch is ON*1 and the flow sensor is stuck.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VK1S |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1479/79; Flow Sensor Circuit; 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
B1479/79 |
Flow Sensor Circuit |
DESCRIPTION
The flow sensor is built into the compressor, and outputs a signal indicating the flow rate of the refrigerant. The air conditioning amplifier converts the received signal to refrigerant flow rate data according to the characteristics of the sensor, which it then sends to the ECM via CAN communication.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1479/79 |
|
|
*1: As the flow sensor measures the flow rate of the refrigerant in the air conditioning system, it is necessary to turn the ignition switch to ON in order to check the state of the flow sensor.
WIRING DIAGRAM
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (FLOW SENSOR) |
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Flow sensor |
Flow sensor voltage / Min.: 0 V Max.: 5 V |
Flow sensor voltage displayed |
Open circuit: 4.7 V or more Short circuit: 0.3 V or less |
Result
|
Result |
Proceed to |
|---|---|
|
4.7 V or more: Open circuit (A/C is on) |
A |
|
0.3 V or less: Short circuit (A/C is on) |
A |
|
Circuit is not open or shorted |
B |
| B |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (FLOW SENSOR - AIR CONDITIONING AMPLIFIER) |
(a) Disconnect the flow sensor connector.
(b) Disconnect the air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B41-3 (QUFL) - D75-7 (FLOQ) |
Always |
Below 1 Ω |
|
B41-1 (S5FL) - D75-30 (S5-1) |
Always |
Below 1 Ω |
|
B41-2 (SGFL) - D75-13 (SG-2) |
Always |
Below 1 Ω |
|
D75-7 (FLOQ) - Body ground |
Always |
10 kΩ or higher |
|
D75-30 (S5-1) - Body ground |
Always |
10 kΩ or higher |
|
D75-13 (SG-2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
|
3. |
REPLACE FLOW SENSOR (COMPRESSOR AND PULLEY) |
(a) Replace the flow sensor with a normal one (See page
![2016 - 2020 MY Sienna [12/2015 - ]; HEATING / AIR CONDITIONING: COMPRESSOR: REMOVAL](/t3Portal/stylegraphics/info.gif)
).
|
|
4. |
CHECK FOR DTC |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
OK:
DTC B1479 is not output.
| OK |
|
END |
| NG |
|
|
5. |
READ VALUE USING TECHSTREAM (FLOW SENSOR) |
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Check the value(s) by referring to the table below.
Air Conditioner
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Flow sensor |
Flow sensor voltage / Min.: 0 V Max.: 5 V |
Flow sensor voltage displayed |
Open circuit: 4.7 V or more Short circuit: 0.3 V or less |
Result
|
Result |
Proceed to |
|---|---|
|
Sensor is stuck in an intermediate position
|
A |
|
Sensor is stuck at zero position
|
A |
|
Sensor is not stuck |
B |
| B |
|
|
|
6. |
REPLACE FLOW SENSOR |
(a) Replace the flow sensor with a normal one (See page
).
|
|
7. |
CHECK FOR DTC |
(a) Clear the DTCs (See page
).
(b) Check for DTCs (See page
).
OK:
DTC B1479 is not output.
| OK |
|
END |
| NG |
|
|
|