Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Compressor Lock Sensor Circuit (B1422)

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

Open or short in A/C lock sensor circuit

  • Magnet-clutch assembly
  • A/C lock sensor
  • Harness or connector
  • Air conditioning amplifier assembly
  • CAN communication system

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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.
    • for 2TR-FE (See page for 2GR-FKS (See page  ) )
    • for 2GR-FKS (See page )
  • 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

GO TO CAN COMMUNICATION SYSTEM

OK

2.

INSPECT A/C LOCK SENSOR

(a) Remove the A/C lock sensor (See page (b) Inspect the A/C lock sensor (See page  ). ).

(b) Inspect the A/C lock sensor (See page ).

NG

REPLACE A/C LOCK SENSOR

OK

3.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER COMPRESSOR ASSEMBLY)

(a) Disconnect the A1 cooler compressor assembly connector.

(b) Disconnect the A14 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A14-4 (LOCK) - A1-2

Always

Below 1 Ω

A14-33 (SG-1) - A1-3

Always

Below 1 Ω

A14-4 (LOCK) or A1-2 - Body ground

Always

10 kΩ or higher

A14-33 (SG-1) or A1-3 - 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)
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 ...

PTC Heater Circuit
DESCRIPTION PTC HTR heater relays are closed in accordance with signals from the air conditioning amplifier assembly and power is supplied to the quick heater assembly installed on the radiator h ...

Other materials:

Accumulator Low Pressure (C1256)
DESCRIPTION The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid. DTC No. DTC Detecting Condition Trouble Areas C1256 Fluid pressure inside the accumulator drops below the specification ...

Symbols used in illustrations
The symbol of a circle with a slash through it means “Do not”, “Do not do this”, or “Do not let this happen”. Arrows indicating operations Indicates the action (pushing, turning, etc.) used to operate switches and other devices. Indicates the outcome of an operation (e.g. a ...

Pressure Control Solenoid "B" Actuator Stuck Off (P07757F)
SYSTEM DESCRIPTION The ECM uses the vehicle speed signal and signals from the transmission revolution sensors (NT, SP2) to detect the actual gear (1st, 2nd, 3rd, 4th, 5th or 6th gear). The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical problems of t ...

© 2011-2023 Copyright www.ttguide.net