1991 LEXUS SC400 Service Repair Manual

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Page 57 of 4087

LEXUS SC400 1991 Service Repair Manual
RECOVERING OF REFRIGERANT IN
REFRIGERANT SYSTEM
When discharging refrigerant from the system as follows, use
a recovery machine to recover the refrigerant.Before replacing parts on the refrigerant li

Page 58 of 4087

LEXUS SC400 1991 Service Repair Manual
EVACUATING AIR IN
REFRIGERATION SYSTEM AND
CHARGING WITH REFRIGERANT
HINT: Before charging the system with refrigerant, be sure
carry out a complete evacuation of the system.
1. INSTALL MANIFOLD GAU

Page 59 of 4087

LEXUS SC400 1991 Service Repair Manual
4. INSPECT REFRIGERATION SYSTEM FOR LEAKSHINT: After evacuating the air in system, check the system for
leakage.
(a) Open the high pressure hand valve to charge the system with refrigerant.
(b) Whe

Page 60 of 4087

LEXUS SC400 1991 Service Repair Manual
6. CHARGE PARTIALLY REFRIGERATION SYSTEM WITHREFRIGERANT (VAPOR)
HINT: This step is used to charge the system through the low
pressure side with refrigerant in a vapor state.
NOTICE: Do not open the

Page 61 of 4087

LEXUS SC400 1991 Service Repair Manual
TROUBLESHOOTING
±
AIR CONDITIONING SYSTEM TroubleshootingAC±21
WhereEverybodyKnowsYourName

Page 62 of 4087

$LEXUS SC400 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING Perform troubleshooting in accordance with the procedure on the following page.\ [1] CUSTOMER PROBLEM ANALYSIS Using the customer problem analysis check sheet for$

HOW TO PROCEED WITH TROUBLESHOOTING
Perform troubleshooting in accordance with the procedure on the following page.\
[1] CUSTOMER PROBLEM ANALYSIS Using the customer problem analysis check sheet for reference, ask the c\
ustomer in as much detail as
possible about the problem. A subjective complaint such as ºpoor air conditio\
ner efficiencyº is also consid-
ered in the air conditioner complaints.
Therefore, in ºCustomer Problem Analysisº and ºProblem Symptom Confirmationº\
, check carefully to deter-
mine whether the level of performance is the actual (normal) level or whet\
her it is abnormal. Then perform
troubleshoot accordingly.
[2] CHECK AND CLEAR THE DIAGNOSTIC CODES (PRECHECK) First check the diagnostic codes to see if there are any malfunction cod\
es stored in memory. If there are
malfunction codes, make a note of them, then clear them and proceed to [3] problem \
Symptom Confirma-
tionº.
[3] PROBLEM SYMPTOM CONFIRMATION, [4] SYMPTOM SIMULATION Confirm the problem symptoms. If the problem does not reappear, be sure to simulate the problem by main-
ly checking the circuits indicated by the diagnostic code in step [2], u\
sing ºProblem Simulation Methodº.
[5] DIAGNOSTIC CODE CHECK
Check the diagnostic codes. Check for problems with the sensors or the w\
ire harness.
[6] DIAGNOSTIC CODE CHART If a malfunction code is confirmed in the diagnostic code check, proceed t\
o the check procedure indicated
by the matrix chart for each diagnostic code.
[7] MATRIX CHART OF PROBLEM SYMPTOMS
If the normal code is confirmed in the diagnostic code check, perform in\
spection in accordance with the
inspection order in the matrix chart of problem symptoms.
[8] CIRCUIT INSPECTION Proceed with diagnosis of each circuit in accordance with the inspection order c\
ofirmed in [6] and [7]. Deter-
mine whether the cause of the problem is in the sensor, actuators, wire harness and connectors, or the
ECU.
[9] ACTUATOR CHECK Check actuators for proper operation. Instructions for this diagnosis ar\
e given in the flow chart for each
circuit.
[10] REPAIRS After the cause of the problem is located, perform repairs by following the i\
nspection and replacement pro-
cedures in this manual.
[11] CONFIRMATION TEST
After completing repairs, confirm not only that the malfunction is elimi\
nated, but also perform diagnostic
code check and actuator check, etc. again to make sure the entire air condit\
ioning system is operating cor-
rectly.
AC±22
±
AIR CONDITIONING SYSTEM REPAIR INSTRUCTIONS
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Page 63 of 4087

LEXUS SC400 1991 Service Repair Manual
P. AC±24
P. IN±20
P. AC±26 ~ AC±29
P. AC±28
P. AC±26 ~ AC±29
P. AC±36
P. AC±44 ~ AC±101
±
AIR CONDITIONING SYSTEM TroubleshootingAC±23
WhereEverybodyKnowsYourName

Page 64 of 4087

LEXUS SC400 1991 Service Repair Manual
CUSTOMER PROBLEM ANALYSIS CHECK SHEET
AC±24±
AIR CONDITIONING SYSTEM Troubleshooting
WhereEverybodyKnowsYourName

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