Isuzu 2000 Trooper Workshop Manual page 159

1A–130 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Condition
Magnetic clutch does not work
Chart A: Magnetic Clutch Does Not work
Step
1 Is the fuse No.C–20 normal?
2 Is the relay No.X–7 (compressor relay) No.X–5 (A/C
thermo relay) and No.B–36 (heater relay) normal?
3 Is the thermo unit normal?
4 Is the pressure switch normal?
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?
6 Repair or replace the magnetic clutch.
Is the action complete?
7 Is there continuity between the harness side connector
terminal No.X7–4 and No.E3–1?
8 Repair an open circuit between terminal No.X7–4 and
No.E3–1.
Is the action complete?
9 Is the battery voltage applied between the harness side
connector terminal No.X7–2 and ground, No.X7–1 and
ground?
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?
11 Is the battery voltage applied between the harness side
connector terminal No.I33–18 and ground?
12 Repair an open circuit between terminal No.I33–18 and
No.X7–3.
Is the action complete?
13 Is the battery voltage applied between the harness side
connector terminal No.C25–1 and ground?
14 Repair an open circuit between terminal No.C25–1 and
fuse No.C–20.
Is the action complete?
15 Is the battery voltage applied between the harness side
connector terminal No.X5–3 and ground, No.X5–2 and
ground?
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?
17 Is the battery voltage applied between the harness side
connector terminal No.I32–14 and ground?
Possible cause
—
Action
Correction
Refer to Chart A
Value(s) Yes
— Go to Step 2
— Go to Step 3
— Go to Step 4
— Go to Step 5
— Go to Step 6
— Verify repair
— Go to Step 9
— Go to Step 7
— Go to Step 11
— Go to Step 9
— Go to Step 13
— Go to Step 11
— Go to Step 15
— Go to Step 13
— Go to Step 17
— Go to Step 15
— Go to Step 19
No
Replace the
fuse
Replace the
fuse
Replace the
thermo unit
Replace the
pressure
switch
Go to Step 7
—
Go to Step 8
—
Go to Step 10
—
Go to Step 12
—
Go to Step 14
—
Go to Step 16
—
Go to Step 18