SYSTEM DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
INSPECT MAGNET CLUTCH RELAY (MG CLT)
CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY, AIR CONDITIONING AMPLIFIER AND COOLER COMPRESSOR)
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
INSPECT COOLER COMPRESSOR ASSEMBLY
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER COMPRESSOR)
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)
CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
DTC B1422 Compressor Lock Sensor Circuit
SYSTEM DESCRIPTION
The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.
The air conditioning amplifier assembly sends an air conditioning operation request signal to the ECM via direct line, and the ECM sends a magnet clutch operation permission signal to the air conditioning amplifier assembly via direct line.
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 cooler compressor assembly is locked and turns the magnet clutch assembly off.
| DTC Code | DTC Detection Condition | Trouble Area |
| B1422 |
An open or short in the compressor lock sensor circuit. |
Cooler compressor assembly
Harness or connector
Magnet clutch relay (MG CLT)
Air conditioning amplifier assembly
ECM
CAN communication system
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WIRING DIAGRAM
INSPECTION PROCEDURE
- As DTC B1422 is also output when the fan & generator V-belt is damaged or loose, inspect the belt before performing troubleshooting.
| 1.CHECK CAN COMMUNICATION SYSTEM |
Use the intelligent tester to check if the CAN communication system is functioning normally ().
Result| Result | Proceed to |
| CAN DTC is not output | A |
| CAN DTC is output (for LHD) | B |
| CAN DTC is output (for RHD) | C |
| | GO TO CAN COMMUNICATION SYSTEM ()
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| | GO TO CAN COMMUNICATION SYSTEM ()
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| 2.INSPECT MAGNET CLUTCH RELAY (MG CLT) |
Remove the magnet clutch relay (MG CLT).
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 5 |
Battery voltage is not applied to terminals 1 and 2 | 10 kΩ or higher |
| Battery voltage is applied to terminals 1 and 2 | Below 1 Ω |
| | REPLACE MAGNET CLUTCH RELAY (MG CLT) |
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| 3.CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY, AIR CONDITIONING AMPLIFIER AND COOLER COMPRESSOR) |
Remove the magnet clutch relay (MG CLT).
Disconnect the E81 air conditioning amplifier assembly connector.
Disconnect the C30 cooler compressor assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| Magnet clutch relay terminal 1 - Body ground | Ignition switch ON | 11 to 14 V |
| Ignition switch off | Below 1 V |
| Magnet clutch relay terminal 5 - Body ground | Ignition switch ON | 11 to 14 V |
| Ignition switch off | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| Magnet clutch relay terminal 2 - E81-20 (MGC) | Always | Below 1 Ω |
| Magnet clutch relay terminal 3 - C30-3 (MG+) |
| Magnet clutch relay terminal 1 - Body ground | Always | 10 kΩ or higher |
| Magnet clutch relay terminal 2 - Body ground |
| Magnet clutch relay terminal 3 - Body ground |
| Magnet clutch relay terminal 4 - Body ground |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
Remove the air conditioning amplifier assembly with its connectors still connected ().
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| E81-20 (MGC) - Body ground |
Engine idling
Blower switch LO level
A/C switch on (magnet clutch on permitted)
| Below 1 V |
Engine idling
Blower switch LO level
A/C switch off or on (magnet clutch on not permitted)
| 11 to 14 V |
Text in Illustration| *a | Component with harness connected
(Air Conditioning Amplifier Assembly) |
| 5.INSPECT COOLER COMPRESSOR ASSEMBLY |
Remove the cooler compressor assembly.
for 1VD-FTV: .
for 1GR-FE: .
Check the magnet clutch operation.
- OK:
| Measurement Connection | Specified Condition |
Battery positive (+) → 3 (MG+)
Battery negative (-) → cooler compressor assembly body | Magnet clutch engages |
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) | 160 to 320 Ω |
Result| Result | Proceed to |
| OK | A |
| NG (for 1VD-FTV) | B |
| NG (for 1GR-FE) | C |
| | REPLACE COOLER COMPRESSOR ASSEMBLY ()
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| | REPLACE COOLER COMPRESSOR ASSEMBLY ()
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| 6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER COMPRESSOR) |
Disconnect the E81 air conditioning amplifier assembly connector.
Disconnect the C30 cooler compressor connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E81-8 (LOCK) - C30-1 (SSR+) | Always | Below 1 Ω |
| E81-35 (SG-5) - C30-2 (SSR-) | Always | Below 1 Ω |
| E81-8 (LOCK) - Body ground | Always | 10 kΩ or higher |
| E81-35 (SG-5) - Body ground | Always | 10 kΩ or higher |
Result| Result | Proceed to |
| OK (When troubleshooting according to problem symptoms table) | A |
| OK (When troubleshooting according to the DTC) | B |
| NG | C |
| | REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| A | |
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| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM) |
Disconnect the E81 air conditioning amplifier assembly connector.
Disconnect the A38*1 or A52*2 ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| E81-17 (AC1) - A38-30 (AC1) | Always | Below 1 Ω |
| E81-27 (ACT) - A38-18 (ACT) | Always | Below 1 Ω |
| E81-17 (AC1) - Body ground | Always | 10 kΩ or higher |
| E81-27 (ACT) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| E81-17 (AC1) - A52-30 (AC1) | Always | Below 1 Ω |
| E81-27 (ACT) - A52-18 (ACT) | Always | Below 1 Ω |
| E81-17 (AC1) - Body ground | Always | 10 kΩ or higher |
| E81-27 (ACT) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY |
Remove the air conditioning amplifier assembly with its connectors still connected ().
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| E81-17 (AC1) - Body ground |
Engine idling
Blower switch LO level
A/C switch on
| Below 1 V |
Engine idling
Blower switch LO level
A/C switch off
| 11 to 14 V |
| E81-27 (ACT) - Body ground |
Engine idling
Blower switch LO level
A/C switch on (magnet clutch on)
| Below 1 V |
Engine idling
Blower switch LO level
A/C switch off or on (magnet clutch off)
| 11 to 14 V |
Text in Illustration| *a | Component with harness connected
(Air Conditioning Amplifier Assembly) |
| OK | |
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| REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()
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| 9.REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one ().
Check the air conditioning system to check it functions properly.
- OK:
- Air conditioning system functions operate normally.
Result| Result | Proceed to |
| OK | A |
| NG (for 1GR-FE) | B |
| NG (for 1VD-FTV) | C |
| A | |
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| END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY) |
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