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
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