- Air conditioning compressor (lock sensor)
- Compressor drive belt
- Harness or connector between air conditioning compressor (lock sensor) and air conditioning amplifier
- Air conditioning amplifier
- CAN communication system
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002ZSV004X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B1422/22 |
Compressor Lock Sensor Circuit |
DESCRIPTION
The ECM sends a engine speed signal to the air conditioning amplifier via the CAN communication system.
The air conditioning amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier determines that the compressor locks, and turns the magnetic clutch off.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1422/22 |
Open or short in compressor lock sensor circuit |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Select "Communication Bus Check"
OK:
All ECUs and sensors connected to the CAN communication system are displayed.
Result
|
Result |
Proceed to |
|
CAN system is normal |
A |
|
CAN system is abnormal |
B |
|
|
2. |
CHECK AIR CONDITIONING AMPLIFIER |
(a) Remove the air conditioning amplifier with the connectors still connected
.
(b) Using an oscilloscope, check the waveform.
Compressor Lock Signal
|
Terminal Name |
LOCK - SG-2 |
|
Tester Range |
200 mV/DIV., 10 ms./DIV. |
|
Condition |
Engine is running Blower switch LO A/C switch ON |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (When troubleshooting according to Problem Symptoms Table) |
B |
|
OK (When troubleshooting according to the DTC output) |
C |
(c) Remove the air conditioning amplifier.
|
|
3. |
INSPECT AIR CONDITIONING COMPRESSOR (LOCK SENSOR) |
(a) Disconnect the D39 air conditioning compressor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (SSR+) - 2 (SSR-) |
20°C (68°F) |
165 to 205 Ω |
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (for 2UZ-FE) |
B |
|
NG (for 3UR-FE) |
C |
(c) Reconnect the air conditioning compressor connector.
|
|
4. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING COMPRESSOR) |
|
(a) Disconnect the H24 air conditioning amplifier connector. |
(b) Disconnect the D39 air conditioning compressor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H24-8 (LOCK) - D39-1 (SSR+) |
Always |
Below 1 Ω |
|
H24-13 (SG-2) - D39-2 (SSR-) |
Always |
Below 1 Ω |
|
H24-8 (LOCK) or D39-1 (SSR+) - Body ground |
Always |
10 kΩ or higher |
|
H24-13 (SG-2) or D39-2 (SSR-) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the air conditioning amplifier connector.
|
|
|