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:
Heater Circuit (C1AAE)
DESCRIPTION
If the forward recognition camera detects a malfunction in the camera heater
(forward recognition hood) circuit, it will output a malfunction signal to the millimeter
wave radar sensor assembly via CAN communication and DTC C1AAE will be stored.
DTC No.
Detect ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Troubleshooting of the theft deterrent system is based on the premise
that the power door lock control system, wireless door lock control system*1
and smart key system*2 are operating normally. Accordingly, before troubleshooting
the theft deterrent ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
CAUTION:
Some of these service operations affect the SRS airbag system. Read
the precautionary notices concerning the SRS airbag system before servicing
(See page ).
If the side airbag was deployed, replace the front seat assembly with
a ne ...
