Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual - part 36

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–115

Inspection of the Magnetic Clutch System

6VE1 Engine

D08R200037

1A–116 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Condition

Possible cause

Correction

Magnetic clutch does not work

—

Refer to 

Chart A

Chart A: Magnetic Clutch Does Not work 

Step

Action

Value(s)

Yes

No

1

Is the fuse No.F–7 normal?

—

Go to 

Step 2

Replace the

fuse

2

Is the relay No.X–2 (compressor relay) No.X–8 (A/C
thermo relay) and No.X–1 (heater relay) normal?

—

Go to 

Step 3

Replace the

relay

3

Is there continuity between the pressure switch side
connector terminal No.C21–1 and No.C21–2?

—

Go to 

Step 5

Go to 

Step 4

4

Pressure switch defective or refrigerant pressure
improper.
Pressure switch replaced or refrigerant pressure
adjusted?

—

Go to 

Step 3

—

5

1. Turn the ignition switch on. (the engine is run.) 
2. Turn the air conditioner switch on.

Is the battery voltage applied between the harness side
connector terminal No.E2–1 and the ground?

—

Go to 

Step 7

Go to 

Step 6

6

Magnetic clutch defective or earth defective.

Magnetic clutch replaced or earth replaced?

—

Go to 

Step 5

—

7

Is there continuity between the harness side connector
terminal No.X2–1 and No.E2–1?

—

Go to 

Step 9

Go to 

Step 8

8

Repair an open circuit between terminal No.X2–1 and
No.E2–1.

Is the action complete?

—

Go to 

Step 7

—

9

Is the battery voltage applied between the harness side
connector terminal No.X2–5 and ground, No.X2–2 and
ground?

—

Go to 

Step 11

Go to 

Step 10

10

Repair an open circuit between terminal No.X2–5 and
fuse No.F–7, No.X2–2 and fuse No.F–7.

Is the action complete?

—

Go to 

Step 9

—

11

Is the battery voltage applied between the harness side
connector terminal No.I20–18 and ground?

—

Go to 

Step 13

Go to 

Step 12

12

Repair an open circuit between terminal No.I20–18 and
No.X2–4.

Is the action complete?

—

Go to 

Step 11

—

13

Is the battery voltage applied between the harness side
connector terminal No.C21–2 and ground?

—

Go to 

Step 15

Go to 

Step 14

14

Repair an open circuit between terminal No.C21–2 and
fuse No.F–7.

Is the action complete?

—

Go to 

Step 13

—

15

Is the battery voltage applied between the harness side
connector terminal No.X8–5 and ground, No.X8–2 and
ground?

—

Go to 

Step 17

Go to 

Step 16

16

Repair an open circuit between terminal No.X8–5 and
No.C21–1, No.X8–2 and fuse No.F–7.

Is the action complete?

—

Go to 

Step 15

—

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–117

Chart A: Magnetic Clutch Does Not work  (Cont’d)

Step

No

Yes

Value(s)

Action

17

Is the battery voltage applied between the harness side
connector terminal No.I19–14 and ground?

—

Go to 

Step 19

Go to 

Step 18

18

Repair an open circuit between terminal No.X8–3 and
I19–14.

Is the action complete?

—

Go to 

Step 17

—

19

Is there continuity between the harness side connector
terminal No.X8–1 and PCM (F45)?

—

Go to 

Step 21

Go to 

Step 20

20

Repair an open circuit between terminal No.X8–1 and
PCM (F45).

Is the action complete?

—

Go to 

Step 19

—

21

Is there continuity between the harness side connector
terminal No.X2–4 and PCM (F4)?

—

Go to 

Step 23

Go to 

Step 22

22

Repair on open circuit between terminal No.X2–4 and
PCM (F4).

Is the action complete?

—

Go to 

Step 21

—

23

Is there continuity between the harness side connector
terminal No.I20–4 and ground?

—

Go to 

Step 25

Go to 

Step 24

24

Repair an open circuit between terminal No.I20–4 and
PCM (S47).

Is the action complete?

—

Go to 

Step 23

—

25

1. Connect the connector of PCM.
2. Connect the connector terminal No.I19–14 which is

on the harness side on the auto air conditioner
control unit.

Magnetic clutch works?

—

Replace the

auto air

conditioner
control unit

Replace the

PCM

CAUTION: There are conditions which air
conditioner system dose not operate except trouble
as follows.
1. The throttle is griater than 90%.

2. The ignition voltage is below 10.5 volts.

3. The engine speed greater than 4500 RPM for 5

seconds or 5400 RPM.

4. The engine coolant temperature (ECT) is greater

than 125

°

C (257

°

F).

5. The intake air temperature (IAT) is less than 5

°

C

(41

°

F).

6. The power steering pressure switch signals a

high pressure condition.

1A–118 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Individual Inspection

In Car Sensor

1. Disconnect the in car sensor connector (I–17).
2. Measure resistance between the in car sensor side

terminal No.I17–3 and No.I17–4.

C01R200015

Sun Sensor

1. Disconnect the sun sensor connector (I–15).
2. Measure the current value on the sun sensor when

placed it approximately 15 cm away from 60W
incandescent lamp.

D06R200001

Ambient Sensor

1. Disconnect the connector (C–19) on the ambient

sensor.

2. Measure resistance between the ambient sensor side

terminals. 

C01R200014