With Monochrome Display
MAGNET CLUTCH
Description
SYSTEM DESCRIPTION
A/C auto amp. controls A/C compressor operation by ambient temperature and signal from ECM.
Low Temperature Protection Control
A/C auto amp. will turn the A/C compressor ON or OFF as determined by a signal detected by ambient sensor.
When ambient temperature is greater than 4�C (39�F), the A/C compressor turns ON. The A/C compressor turns OFF when ambient temperature is less than 2.5�
C (37�F).
Component Function Check
1. FUNCTION INSPECTIONS
1.Press AUTO switch. AUTO is indicated on the display.
2.Press the A/C switch.
3.Check that the indicator of the A/C switch turns on. Check visually and by sound that the A/C compressor is operating. (The discharge air temperature or fan speed varies depending on the ambient temperature, in-vehicle temperature, and temperature setting.)
4.Press the A/C switch again.
5.Check that the indicator of the A/C switch turns OFF. Check visually and by sound that the A/C compressor stops.
Does it operate normally?
YES- Inspection End.
NO- Perform trouble diagnosis for the A/C compressor. .
Diagnosis Procedure
Regarding Wiring Diagram information, With Monochrome Display.
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1. INSPECTION IN AUTO ACTIVE TEST MODE
Perform "AUTO ACTIVE TEST". Diagnosis Description.
Does it operate normally?
YES- GO TO 6.
NO- GO TO 2.
2. CHECK POWER SUPPLY FOR A/C COMPRESSOR
1.Turn ignition switch OFF.
2.Disconnect A/C compressor connector.
3.Start engine and press A/C switch.
4.Check voltage between A/C compressor harness connector F3
terminal 1 and ground.
Is the inspection result normal?
YES-Check magnet clutch coil.
1.If NG, replace magnet clutch. Service and Repair.
2.If OK, check A/C compressor mounting points for looseness or corrosion and repair as necessary.
NO- GO TO 3
3. CHECK FUSE
Check 10A fuse (No. 41) located in IPDM E/R.
NOTE:
Fuse, Connector And Terminal Arrangement for fuse location.
Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 5.
4. CHECK CIRCUIT CONTINUITY BETWEEN A/C RELAY IN IPDM E/R AND A/C COMPRESSOR
1.Turn ignition switch ON.
2.Disconnect IPDM E/R connector F10 and A/C compressor connector F3.
3.Check continuity between A/C compressor harness connector
F3 (A) terminal 1 and IPDM E/R harness connector F10 (B) terminal 48.
1 - 48: Continuity should exist.
Is the inspection result normal?
YES- Replace A/C Relay.
NO- Repair harness or connector.
5. CHECK A/C COMPRESSOR CIRCUIT FOR SHORT
Check continuity between A/C compressor harness connector F3
terminal 1 and ground.
1 - Ground: Continuity should not exist.
Is the inspection result normal?
YES- Replace IPDM E/R. Service and Repair.
NO- Repair harness or connector.
6. CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT
1.Using CONSULT, perform "SELF-DIAGNOSIS RESULTS" of HVAC.
2.Check if any DTC No. is displayed in the self-diagnosis results.
NOTE:
If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. With Monochrome Display or With Monochrome Display.
Is any DTC No. displayed?
YES- Perform diagnosis for the applicable DTC. Testing and Inspection.
NO- GO TO 7.
7. CHECK A/C AUTO AMP. INPUT SIGNAL
Using CONSULT, check "On/Off" of "COMP REQ SIG" and "FAN REQ SIG" in "DATA MONITOR" of HVAC.
With Monochrome Display.
A/C SWITCH ON: COMP REQ SIG On
A/C SWITCH OFF: COMP REQ SIG Off
FAN CONTROL DIAL ON: FAN REQ SIG On
FAN CONTROL DIAL OFF: FAN REQ SIG Off
Is the inspection result normal?
YES- GO TO 8.
NO- Replace A/C auto amp. With Monochrome Display.
8. CHECK REFRIGERANT PRESSURE SENSOR
Check refrigerant pressure sensor. Refrigerant Pressure Sensor.
Is the inspection result normal?
YES- Inspection End.
NO- Repair or replace malfunctioning parts.