Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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 turns on to operate the magnetic clutch assembly.

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 (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

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

INSPECT MG CLT RELAY

(a) Remove the MG CLT relay.

(b) Inspect the MG CLT relay (See page ).

NG

REPLACE MG CLT RELAY

OK

3.

CHECK HARNESS AND CONNECTOR (MG CLT RELAY - POWER SOURCE CIRCUIT)

(a) Remove the MG CLT relay.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

MG CLT-1 - Body ground

Ignition switch ON

11 to 14 V

MG CLT-5 - Body ground

Ignition switch ON

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (MG CLT RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND MAGNET-CLUTCH ASSEMBLY)

(a) Remove the MG CLT relay.

(b) Disconnect the A35 air conditioning amplifier assembly connector.

(c) Disconnect the A1 magnet-clutch assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

MG CLT-2 - A35-10 (MGC)

Always

Below 1 Ω

MG CLT-3 - A1-1 (MG+)

Always

Below 1 Ω

MG CLT-2 or A35-10 (MGC) - Body ground

Always

10 kΩ or higher

MG CLT-3 or A1-1 (MG+) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

INSPECT MAGNET-CLUTCH ASSEMBLY

(a) Remove the magnet-clutch assembly (See page (b) Inspect the magnet-clutch assembly (See page (b) Inspect the magnet-clutch assembly (See page ).

(b) Inspect the magnet-clutch assembly (See page ).

NG

REPLACE MAGNET-CLUTCH ASSEMBLY

OK

6.

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Reconnect the A35 air conditioning amplifier assembly connector.

(b) Reconnect the A1 magnet-clutch assembly connector.

(c) Reinstall the MG CLT relay.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A35-10 (MGC) - Body ground

  • Engine idling
  • "A/C" switch off → on
  • Blower switch: LO
  • Magnet-clutch assembly: off → on

11 to 14 V → Below 1 V

Text in Illustration

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

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