Isuzu Trooper (2000 year). Service manual — part 40
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–129
Inspection of the Magnetic Clutch System
6VE1 Engine
D08RY00143
1A–130 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.C–20 normal?
—
Go to Step 2
Replace the
fuse
2
Is the relay No.X–7 (compressor relay) No.X–5 (A/C
thermo relay) and No.B–36 (heater relay) normal?
—
Go to Step 3
Replace the
fuse
3
Is the thermo unit normal?
—
Go to Step 4
Replace the
thermo unit
4
Is the pressure switch normal?
—
Go to Step 5
Replace the
pressure
switch
5
1. Turn the ignition switch on. (the engine is run.)
2. Push the air conditioner switch on.
Is the battery voltage applied between the harness side
connector terminal No.E3–1 and the ground?
—
Go to Step 6
Go to Step 7
6
Repair or replace the magnetic clutch.
Is the action complete?
—
Verify repair
—
7
Is there continuity between the harness side connector
terminal No.X7–4 and No.E3–1?
—
Go to Step 9
Go to Step 8
8
Repair an open circuit between terminal No.X7–4 and
No.E3–1.
Is the action complete?
—
Go to Step 7
—
9
Is the battery voltage applied between the harness side
connector terminal No.X7–2 and ground, No.X7–1 and
ground?
—
Go to Step 11
Go to Step 10
10
Repair an open circuit between terminal No.X7–2 and
fuse No.C–20, No.X7–1 and fuse No.C–20.
Is the action complete?
—
Go to Step 9
—
11
Is the battery voltage applied between the harness side
connector terminal No.I33–18 and ground?
—
Go to Step 13
Go to Step 12
12
Repair an open circuit between terminal No.I33–18 and
No.X7–3.
Is the action complete?
—
Go to Step 11
—
13
Is the battery voltage applied between the harness side
connector terminal No.C25–1 and ground?
—
Go to Step 15
Go to Step 14
14
Repair an open circuit between terminal No.C25–1 and
fuse No.C–20.
Is the action complete?
—
Go to Step 13
—
15
Is the battery voltage applied between the harness side
connector terminal No.X5–3 and ground, No.X5–2 and
ground?
—
Go to Step 17
Go to Step 16
16
Repair an open circuit between terminal No.X5–3 and
No.C25–2, No.X5–2 and fuse No.C–20.
Is the action complete?
—
Go to Step 15
—
17
Is the battery voltage applied between the harness side
connector terminal No.I32–14 and ground?
—
Go to Step 19
Go to Step 18
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–131
Chart A: Magnetic Clutch Does Not work (Cont’d)
Step
No
Yes
Value(s)
Action
18
Repair an open circuit between terminal No.X5–1 and
I32–14.
Is the action complete?
—
Go to Step 17
—
19
Is there continuity between the harness side connector
terminal No.I33–4 and ground?
—
Go to Step 21
Go to Step 20
20
Repair an open circuit between terminal No.I33–4 and
No.E19–1.
Is the action complete?
—
Go to Step 20
—
21
Dose the thermo relay “ON” when connecting ground to
the harness connector terminal No.H16–6?
—
Go to Step 23
Go to Step 22
22
Failure on the auto air conditioner 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 257
°
F.
5. The intake air temperature (IAT) is less than 41
°
F.
6. The power steering pressure switch signals a
high pressure condition.
1A–132 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Individual Inspection
In Car Sensor
1. Disconnect the in car sensor connector (I–34).
2. Measure resistance between the in car sensor side
terminal No.I34–3 and No.I34–4.
865RY00011
Sun Sensor
1. Disconnect the sun sensor connector (I–35).
2. Measure the current value on the sun sensor when
placed it approximately 15 cm away from 60W
incandescent lamp.
D06RY00001
Ambient Sensor
1. Disconnect the connector (C–86) on the ambient
sensor.
2. Measure resistance between the ambient sensor side
terminals.
C01RY00006
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