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.
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