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 magnetic clutch off.
DTC Code | DTC Detection Condition | Trouble Area |
---|---|---|
B1422/22 | An open or short in the compressor lock sensor circuit. |
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WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
Use the intelligent tester to check if the CAN communication system is functioning normally.
Result | Proceed to |
---|---|
CAN DTC is not output | A |
CAN DTC is output (for LHD) | B |
CAN DTC is output (for RHD) | C |
B |
GO TO CAN COMMUNICATION SYSTEM Click here |
C |
GO TO CAN COMMUNICATION SYSTEM Click here |
A |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
Remove the air conditioning amplifier assembly with its connectors still connected Click here.
Measure the waveform of the connector.
Item | Content |
---|---|
Terminal No. (Symbol) | E35-28 (LOCK) - E35-29 (SG-5) |
Tool Setting | 200 mV/DIV., 10 ms/DIV. |
Condition | Engine running A/C switch on Blower switch lo |
OK |
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Waveform is as shown in the illustration. |
NG |
INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) Click here |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here
INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)
Disconnect the C37 connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) Click here |
OK |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER COMPRESSOR)
Disconnect the E35 amplifier connector.
Disconnect the C37 compressor connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here