Toyota Tacoma (2015-2018) Service Manual: Compressor Lock Sensor Circuit (B1422/22)
SYSTEM DESCRIPTION
The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.
The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnet-clutch assembly off.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1422/22 |
Open or short in A/C lock sensor circuit |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- ECM malfunctions can affect the storage of this DTC. Therefore, check
all SFI system DTCs and confirm that the system is normal before performing
the following inspection (See page
.gif)
).
- Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
|
1. |
CHECK FOR DTC (CAN COMMUNICATION SYSTEM) |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
Result|
Result |
Proceed to |
|---|---|
|
CAN DTC is not output |
A |
|
CAN DTC is output |
B |
| NG | .gif) |
GO TO CAN COMMUNICATION SYSTEM |
|
.gif)
|
2. |
INSPECT A/C LOCK SENSOR |
(a) Remove the A/C lock sensor (See page ).
(b) Inspect the A/C lock sensor (See page ).
| NG | |
REPLACE A/C LOCK SENSOR |
|
|
3. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER COMPRESSOR ASSEMBLY) |
(a) Disconnect the A1 cooler compressor assembly connector.
(b) Disconnect the A35 and A36 air conditioning amplifier assembly connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A35-7 (LOCK) - A1-2 (SSR+) |
Always |
Below 1 Ω |
|
A36-28 (SG-8) - A1-3 (SSR-) |
Always |
Below 1 Ω |
|
A35-7 (LOCK) or A1-2 (SSR+) - Body ground |
Always |
10 kΩ or higher |
|
A36-28 (SG-8) or A1-3 (SSR-) - Body ground |
Always |
10 kΩ or higher |
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (When troubleshooting according to Problem Symptoms Table) |
B |
|
OK (When troubleshooting according to the DTC) |
C |
| A | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| B | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
Evaporator Temperature Sensor Circuit (B1413/13)
DESCRIPTION
The cooler thermistor sensor (evaporator temperature sensor) is installed on
the evaporator in the air conditioner unit to detect the temperature of the cooled
air that has passed thr ...
Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the air conditioning amplifier assembly is turned on, a magnetic clutch
on signal is sent from the MGC terminal of the air conditioning amplifier assembly.
Then, the MG CLT relay ...
Other materials:
System Diagram
SYSTEM DIAGRAM
...
Stop Light Relay Circuit (C1A4B)
DESCRIPTION
The skid control ECU (master cylinder solenoid)*1 or skid control ECU (brake
actuator assembly)*2 sends a stop light operation request signal to the stop light
relay (stop light switch assembly). If the skid control ECU (master cylinder solenoid)*1
or skid control ECU (brake actua ...
Tire information
Typical tire symbols
1. Tire size
2. DOT and Tire Identification Number (TIN)
3. Location of treadwear indicators
4. Tire ply composition and materials
Plies are layers of rubber-coated parallel cords. Cords are the strands which
form the plies in a tire.
5. Uniform tire quality grading
F ...
