Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 565

1A–128 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

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

Step

No

Yes

Value(s)

Action

17

Repair an open circuit between terminal No.X5–1 and
I32–14.

Is the action complete?

—

Go to Step 16

—

18

Is there continuity between the harness side connector
terminal No.I33–4 and PCM (S47)?

—

Go to Step 20

Go to Step 19

19

Repair an open circuit between terminal No.I33–4 and
PCM (S47).

Is the action complete?

—

Go to Step 18

—

20

Is there continuity between the harness side connector
terminal No.X5–1 and No.I32–14?

—

Go to Step 22

Go to Step 21

21

Repair an open circuit between terminal No.X5–1 and
No.I32–14.

Is the action complete?

—

Go to Step 20

—

22

Is there continuity between the harness side connector
terminal No.X5–4 and PCM (F45)?

—

Go to Step 24

Go to Step 23

23

Repair an open circuit between terminal No.X5–4 and
PCM (F45).

Is the action complete?

—

Go to Step 22

—

24

Is there continuity between the harness side connector
terminal No.X7–3 and PCM (F4)?

—

Go to Step 26

Go to Step 25

25

Repair an open circuit between terminal No.X7–3 and
PCM (F4).

Is the action complete?

—

Go to Step 24

—

26

1. Disconnect the auto A/C control unit connectors

and connect the PCM connectors.

2. Ground the auto A/C control unit connector terminal

No.I32–14.

Does the magnetic clutch work?

—

Go to Step 28

Go to Step 27

27

Replace the PCM.

Is the action complete?

—

Verify repair

—

28

Replace the auto A/C control unit.

Is the action complete?

—

Verify repair

—

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.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–129

Condenser Fan Diagnosis

While the air conditioning is ON, the cycling switch in the
triple pressure switch senses the refrigerant pressure,
and activates the condenser fan to improve the cooling

capacity of the condenser when the refrigerant pressure
exceeds a set pressure value. The condenser fan stops
when the air conditioning is turned “OFF” or when the
pressure goes down below the set pressure value.

D08R200271

Condition

Possible cause

Correction

Condenser fan does not run.

—

Refer to Chart A

—

Refer to Chart B

1A–130 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Chart “A” Condenser Fan Does Not Run 

Step

Action

Value(s)

Yes

No

1

Are 30A fuse normal?

—

Go to Step 2

Replace

2

Is relay (X-19) normal?

—

Go to Step 3

Replace

3

Is pressure switch normal?

—

Go to Step 4

Switch

defective or

insufficient

refrigerant.

4

Is fan motor normal?

—

Go to Step 5

Replace

5

1. Disconnect condenser fan relay (X-19).
2. Check to see if battery voltage is present at the

chassis side relay terminal NO. X19-1.

Is there a battery voltage?

—

Go to Step 6

Repair open

circuit

between

Condenser

Fan fuse

(30A) and

No.X19-1.

6

1. Reconnect condenser fan relay (X-19).
2. Check to see if battery voltage is present at chassis

side connector terminal No.C89-3.

Is there a battery voltage?

—

Go to Step 7

Repair open

circuit

between fuse

(10A) and

C89-3.

7

Check to see if continuity between chassis side relay
terminal No.X19-4 and the chassis side connector
terminal No.C89-4.

Is there a continuity?

—

Go to Step 8

Repair open

circuit.

8

Check to see if continuity between chassis side
connector terminal No. C75-1 and chassis side relay
terminal No.X19-3.

Is there a continuity?

—

Poor ground

or open

circuit

between

chassis side

connector

terminal

No.X19-5 (or

No.C75-2)

and body

ground

(No.C39).

Repair open

circuit.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–131

Chart “B” Condenser Fan Does Not Stop 

Step

Action

Value(s)

Yes

No

1

1. Disconnect the triple pressure connector.

Does condenser fan stop?

—

Replace the

triple

pressure

switch.

Replace the

condenser

fan relay.