Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 544
1A–44 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Magnetic Clutch Diagnosis
D08R200260
When the air conditioning switch and the fan control knob
(fan switch) are turned on with the engine running, current
flows through the thermostat and the compressor relay to
activate the magnetic clutch.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–45
The air conditioning can be stopped by turning off the air
conditioning switch or the fan control knob (fan switch).
However, even when the air conditioning is in operation,
the electronic thermostat, the pressure switch or the
Powertrain Control Module (PCM) is used to stop the air
conditioning temporarily by turning off the magnetic clutch
in the prearranged conditions to reduce the engine load
which is being caused by the rise in the engine coolant
temperature, and the acceleration of the vehicle, etc.
For the inspection of the relays, switches and units in the
table, refer to “Individual Inspection” in this section.
Magnetic Clutch Does Not Run
Step
Action
Yes
No
1
Are No. C-20 (10A) fuse and No. C-19 (25A) fuse OK?
Go to Step 2
Replace
2
Are heater and A/C (B-36), thermostat (X-5), and compressor
(X-7) relays OK?
Go to Step 3
Replace
3
Is pressure switch (triple pressure switch) OK?
Go to Step 4
Switch defective
or insufficient
refrigerant.
4
Are air conditioning switch and fan control knob (Fan Switch) OK?
Go to Step 5
Replace
5
1. Turn the ignition switch “ON” (Engine is running).
2. Air conditioning switch and fan control knob (Fan Switch)
“ON”.
3. Check to see if battery voltage is present at chassis side
connector terminal No. E3-1.
Is there a battery voltage?
Go to Step 6
Go to Step 7
6
Check to see if continuity between compressor side connector
terminal No. E3-1 and the magnetic clutch side connector
terminal.
Is there a continuity?
Magnetic clutch
defective.
Compressor
defective.
7
Check to see if battery voltage is present at chassis side
connector terminal No. C89-2
Is there a battery voltage?
Go to Step 8
Open circuit
between No.C-20
(10A) fuse and
No. C89-2.
8
1. Disconnect thermostat relay (X-5).
2. Check to see if battery voltage is present at the chassis side
relay terminal NO. X5-2
Is there a battery voltage?
Go to Step 9
Open circuit
between No.
C89-1 and
No.X5-2.
9
Check to see if voltage (approx. 10V) is present between chassis
side relay terminal No. X5-1 and No. X5-3.
Is there a battery voltage?
Go to Step 10
Go to Step 16
10
1. Reconnect thermostat relay and disconnect compressor relay
(X-7).
2. Check to see if battery voltage is present at the chassis side
relay terminal No. X7-2.
Is there a battery voltage?
Go to Step 11
Open circuit
between No.
X5-4 and No.
X7-2.
11
Check to see if continuity between chassis side relay terminal No.
X7-4 and the chassis side connector terminal No. E3-1.
Is there a continuity?
Go to Step 12
Open circuit.
12
Check to see if battery voltage is present between chassis side
relay terminal No. X7-1 and No. X7-3.
Is there a battery voltage?
Go to Step 13
Go to Step 14
13
Check to see if battery voltage is present at chassis side relay
terminal No. X7-1.
Is there a battery voltage?
Go to Step 15
Open circuit
between No.
C-20 (10A) fuse
and No. X7-1.
1A–46 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Magnetic Clutch Does Not Run (Cont’d)
Step
No
Yes
Action
14
Check to see if battery voltage is present at chassis side
connector terminal No. E21-F4.
Is there a battery voltage?
Power train
control module
(PCM) defective.
Refer to
Driveability and
Emissions in
Engine section.
Open circuit
between No.
X7-3 and No.
E21-F4.
15
Check to see if continuity between chassis side relay terminal No.
X5-4 and chassis side connector terminal No. E21-F45.
Is there a continuity?
Power train
control module
(PCM) defective.
Refer to
Driveability and
Emissions in
Engine section.
Open circuit
16
Check to see if battery voltage is present at chassis side relay
terminal No. X5-1.
Is there a battery voltage?
Go to Step 17
Go to Step 20
17
1. Reconnect thermostat relay.
2. Check to see if battery voltage is present at chassis side
connector terminal No. B4-3.
Is there a battery voltage?
Go to Step 18
Open circuit
between No.I23-6
and No.B4-3.
18
Check to see if battery voltage (appox 10V) is present at chassis
side connector terminal No. B4-1.
Is there a battery voltage?
Go to Step 19
Open circuit
between No.
X5-3 and No.
B4-1.
19
Check to see if continuity between chassis side connector
terminal No. B4-2 and No. I18-4.
Is there a continuity?
Electronic
thermostat
defective.
Open circuit
between No.
B4-2 and No.
I18-4 or poor
ground (Fan
Switch Ground
Circuit).
20
Check to see if battery voltage is present at chassis side
connector terminal No. I23-2.
Is there a battery voltage?
Open circuit
between X5-1
and No.I23-6.
Open circuit
between No.
C-20 (10A) fuse
and No.I23-2.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–47
Individual Inspection
Fan Control Knob (Fan Switch) And Air
Conditioning (A/C) Switch
1. Check for continuity between the fan switch and the
A/C switch side connector terminals.
865RS002
Fan swtich
position
Fan switch connector terminals with
continuity
OFF
No continuity
1
1 – 2 – 4
2
1 – 4 – 5
3
1 – 3 – 4
4
1 – 4 – 6
A/C switch
position
A/C switch connector terminals with
continuity
OFF
1 – 6
ON
1 – 2 – 6
Heater And A/C (B-36), Thermostat (X-5)
And Compressor (X-7) Relay
1. Disconnect relays and check for continuity and
resistance between relay terminals.
D
For handling of these relays, refer to Heater &A/C
Relay in this section.
825RS003
Condition
Relay terminals with con-
tinuity
Normal
1 – 3 (Approx 85–105
W
)
When battery voltage is
applied between 1 – 3
2 – 4
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