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:

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT DRIVE BELT (a) Visually check the belt for defects, such as excessive wear and frayed cords. If any defects are found, replace the drive belt. HINT: Replace the belt if there are any missing ribs. 2. BLEED POWER STEERING SYSTEM (a) Check the fluid ...

Brake Switch "A" Signal Compare Failure (P057162)
DESCRIPTION When the brake pedal is depressed, stop light switch assembly sends a signal to the ECM. Upon receiving the signal, the ECM cancels the cruise control system. DTC Code DTC Detection Condition Trouble Area MIL Note ...

Child restraint systems
A child restraint system for a small child or baby must itself be properly restrained on the seat with the lap portion of the lap/shoulder belt. The laws of all 50 states of the U.S.A. and Canada now require the use of child restraint systems. Points to remember Studies have shown that instal ...

© 2011-2019 Copyright www.ttguide.net