- Checking the quality of the air conditioner.
- Quick check procedure for insufficient cooling.
- Diagnosis of insufficient cooling.
- Refrigeration system leak test.
- Graph of the pressure values on the high and low pressure sides.
- Pressure Check Card (R-134A system).
- Pressure versus temperature R-134a.
- Checking the refrigeration system.
The automatic temperature controller does not function when the ignition is on
| Step | Operation | Values | Yes | No |
| 1 |
Check fuse EF2.
Is fuse EF2 blown?
|
-
|
Go to operation 2
|
Go to operation 3
|
| 2 |
Replace fuse EF2.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 3 |
Is the measured voltage within the specified range?
|
11-14 V
|
Go to operation 4
|
Go to operation 5
|
| 4 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 5 |
Check voltage between terminal A1 and ground.
Is the voltage correct?
|
0 V
|
Go to operation 6
|
Jump to Operation 7
|
| 6 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 7 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
The regulator does not light up when the light switch is on
| Step | Operation | Values | Yes | No |
| 1 |
Check the illumination of other devices.
Do the rest of the instrument lights come on too?
|
-
|
Go to operation 2
|
|
| 2 |
Is the measured voltage within the specified range?
|
11-14 V
|
Go to operation 4
|
Go to operation 3
|
| 3 |
Repair the wiring harness between terminal 3 on connector J6 and terminal A4 on the governor connector.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 4 |
Check backlight bulbs.
Has the lamp burned out?
|
-
|
Go to operation 5
|
Go to operation 6
|
| 5 |
Replace burned out light bulb.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 6 |
Replace automatic temperature controller (ATC).
Has the renovation been completed?
|
-
|
System OK
|
-
|
The electric fan does not work at all
| Step | Operation | Values | Yes | No |
| 1 |
Do the numbers flash on and off?
|
-
|
Go to operation 2
|
Go to operation 3
|
| 2 |
Perform a self-diagnostic circuit test.
Does the indicator show a fault code?
|
-
|
Go to the troubleshooting table for the code that is flashing.
|
-
|
| 3 |
Check fuse F18 in the instrument panel fuse box.
Is this fuse in good condition?
|
-
|
Go to operation 5
|
Go to operation 4
|
| 4 |
Replace fuse F18.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 5 |
Is the measured voltage within the specified range?
|
11-14 V
|
Go to operation 15
|
Jump to operation 8
|
| 6 |
Measure voltage between ground and terminal 30 (BRN/WHT) fan relay.
Is the measured voltage within the specified range?
|
11-14 V
|
Jump to operation 8
|
Jump to Operation 7
|
| 7 |
Repair any faults found at terminal 85 of the relay connector or ground G203.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 8 |
Replace fan relay.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 9 |
Is the measured voltage within the specified range?
|
11-14 V
|
Go to operation 11
|
Jump to operation 10
|
| 10 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 11 |
Measure the resistance between the terminals of the connector on the electric fan.
Does the measured resistance correspond to that indicated in the table?
|
≈ 5 Ohm
|
Jump to operation 13
|
Go to operation 12
|
| 12 |
Replace electric fan.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 13 |
Measure the resistance in the circuit between terminal 1 of the fan connector and terminal 30 of the maximum speed relay and terminal 2 of the power module.
Does the measured resistance correspond to that indicated in the table?
|
≈ 0 ohm
|
Go to operation 15
|
Go to operation 14
|
| 14 |
Fix problems found in the circuit.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 15 |
Measure the resistance in the circuit between terminal 4 of the power module connector and ground.
Does the measured resistance correspond to that indicated in the table?
|
0 ohm
|
Go to operation 17
|
Jump to operation 16
|
| 16 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 17 |
Replace automatic temperature controller (ATC).
Has the renovation been completed?
|
-
|
System OK
|
-
|
Without air source selection control
See the wiring diagram for the circuits covered in this procedure under «Scheme of the air conditioner fan and control drives».
Without air source selection control
| Step | Operation | Values | Yes | No |
| 1 |
Measure the voltage at terminal 4 of the intake motor.
Is the voltage within the specified value?
|
11-14 V
|
Go to operation 3
|
Go to operation 2
|
| 2 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 3 |
Are the voltages within the specified values?
|
Cm. "Intake actuator parameter table"
|
Go to operation 4
|
Go to operation 5
|
| 4 |
Replace intake actuator.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 5 |
Are the voltages within the specified values?
|
Cm. "Intake actuator parameter table"
|
Go to operation 6
|
Jump to Operation 7
|
| 6 |
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 7 |
Check connector on regulator.
Is a broken contact found?
|
-
|
Jump to operation 8
|
Go to operation 9
|
| 8 |
Repair or replace the connector.
Has the renovation been completed?
|
-
|
System OK
|
-
|
| 9 |
Replace regulator.
Has the renovation been completed?
|
-
|
System OK
|
-
|
Intake Motor Parameter Table
|
intake mode
|
intake electric drive
|
||
|
|
Connector pin
|
||
|
Regulator/motor
|
Regulator/motor
|
Regulator/motor
|
|
|
B14/7
|
A15/6
|
B13/5
|
|
|
recycling
|
0 V
|
11-14 V
|
11-14 V
|
|
Ventilation 1/3
|
11-14 V
|
0 V
|
11-14 V
|
|
Ventilation
|
11-14 V
|
11-14 V
|
0 V
|
Compressor magnetic clutch does not engage
See the electrical diagram for the circuits covered in this procedure under "A/C compressor control circuit, SOHC" or "A/C compressor control circuit, DOHC".
Compressor magnetic clutch won't engage
| Step | Operation | Values | Yes | No |
| 1 |
Is the measured voltage within the specified range?
|
11-14 V
|
Go to item "Insufficient Cooling Diagnosis"
|
Go to operation 2
|
| 2 |
Replace automatic temperature controller (ATC).
Has the renovation been completed?
|
-
|
System OK
|
-
|