Toyota Tundra Service Manual: Compressor Lock Sensor Circuit (B1422/22)

DESCRIPTION

The ECM sends an engine speed signal to the air conditioning amplifier via the CAN communication system.

The air conditioning amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier determines that the compressor locks, and turns the magnetic clutch off.

DTC Code

DTC Detection Condition

Trouble Area

B1422/22

Open or short in compressor lock sensor circuit

  • Air conditioning compressor (lock sensor)
  • Compressor drive belt
  • Harness or connector between air conditioning compressor (lock sensor) and air conditioning amplifier
  • Air conditioning amplifier
  • CAN communication system

WIRING DIAGRAM

PROCEDURE

1.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Use the Techstream to check if the CAN communication system is functioning normally (see page ).

Result

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK AIR CONDITIONING AMPLIFIER

(a) Remove the air conditioning amplifier with the connectors still connected (see page ).

(b) Using an oscilloscope, check the waveform.

Standard:

Tester Connection

Tool Setting

Condition

Specified Condition

J19-8 (LOCK) - J19-13 (SG-2)

200 mV/DIV., 10 ms./DIV.

Engine is running

A/C switch ON

Blower switch LO

Pulse generation

Result

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

B

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE AIR CONDITIONING AMPLIFIER

A

3.

INSPECT AIR CONDITIONING COMPRESSOR (LOCK SENSOR)

(a) Disconnect the connector from the air conditioning compressor.

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

Standard resistance:

Tester Connection

Condition

Specified Condition

1 (SSR+) - 2 (SSR-)

20°C (68°F)

65 to 125 Ω

NG

REPLACE AIR CONDITIONING COMPRESSOR (LOCK SENSOR)

OK

4.

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

(a) Disconnect the J19 air conditioning amplifier connector.

(b) Disconnect the D60 air conditioning compressor connector.

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

Standard resistance:

Tester Connection

Condition

Specified Condition

J19-8 (LOCK) - D60-1 (SSR+)

Always

Below 1 Ω

J19-13 (SG-2) - D60-2 (SSR-)

J19-8 (LOCK) or D60-1 (SSR+) - Body ground

Always

10 kΩ or higher

J19-13 (SG-2) or D60-2 (SSR-) - Body ground

OK

REPLACE AIR CONDITIONING AMPLIFIER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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