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.
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DTC Code
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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
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1.
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CHECK FOR DTC (CAN COMMUNICATION SYSTEM)
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(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 |
|
|
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2.
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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
|
| 
