Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 562
1A–116 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Condition
Possible cause
Correction
Does not work at all
—
Refer to Chart A
Control failure
—
Refer to Chart B
Chart A: Does Not Work At All
Step
Action
Value(s)
Yes
No
1
Is the fuse FL–1 normal?
—
Go to Step 2
Replace the
fuse
2
Is the fuse C–20 normal?
—
Go to Step 3
Replace the
fuse
3
Is the relay B–36 normal?
—
Go to Step 4
Replace the
relay
4
Turn on the ignition switch. (the engine is run.)
Is the battery voltage applied between the harness side
connector terminal No.I49–3 and ground?
Approx 12V
Go to Step 6
Go to Step 5
5
Repair an open circuit between terminal No.I49–3 and
No.B36–4.
Is the action complete?
—
Go to Step 4
—
6
Is the battery voltage applied between the harness side
connector terminal No.I49–4 and ground?
Approx 12V
Go to Step 8
Go to Step 7
7
Replace the intake actuator motor.
Is the action complete?
—
Go to Step 6
—
8
Is there continuity between the harness side connector
terminal No.I32–11 and No.I49–4?
—
Go to Step 10
Go to Step 9
9
Repair an open circuit between No.I32–11 and I49–4.
Is the action complete?
—
Verify repair
—
10
Replace the auto air conditioner control unit.
Is the action complete?
—
Verify repair
—
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–117
Chart B: Failure on the Intake Control
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.B–36 normal?
—
Go to Step 3
Replace the
relay
3
Turn on the ignition switch. (the engine is run.)
Is the intake actuator stopped?
—
Go to Step 5
Go to Step 4
4
Replace or repair the auto air conditioner control unit.
Is the action complete?
—
Verify repair
—
5
Is there continuity between the harness side connector
terminal No.I49–5 and No.I33–11?
—
Go to Step 7
Go to Step 6
6
Repair an open circuit between terminal No.I49–5 and
No.I33–11.
Is the action complete?
—
Go to Step 5
—
7
Is there continuity between the harness side connector
terminal No.I49–6 and No.I33–12?
—
Go to Step 9
Go to Step 8
8
Repair an open circuit between terminal No.I49–6 and
No.I33–12.
Is the action complete?
—
Go to Step 7
—
9
Is there continuity between the harness side connector
terminal No.I49–1 and No.I33–13?
—
Go to Step 11
Go to Step 10
10
Repair an open circuit between terminal No.I49–1 and
I33-13.
Is the action complete?
—
Go to Step 9
—
11
Is there continuity between the harness side connector
terminal No.I49–2 and No.I33–14?
—
Go to Step 13
Go to Step 12
12
Repair an open circuit between harness No.I49–2 and
No.I33–14.
Is the action complete?
—
Go to Step 11
—
13
1. Disconnect the intake actuator connector No.I49.
2. Is the battery voltage applied between harness side
connector terminal
No.I49–6 and ground?
No.I49–2 and ground?
No.I49–1 and ground?
—
Go to Step 14
Go to Step 15
14
Replace or repair the intake actuator.
Is the action complete?
—
Verify repair
—
15
Replace or repair the air conditioner control unit.
Is the action complete?
—
Verify repair
—
1A–118 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Inspection of the Mix Actuator System
D08R200268
Condition
Possible cause
Correction
Does not work at all
—
Refer to Chart A
Control failure
—
Refer to Chart B
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–119
Chart A: Does Not work At All
Step
Action
Value(s)
Yes
No
1
1. Turn on the ignition switch (the engine is run).
2. Disconnect the mix actuator connector (I–45).
3. Short-circuit the chassis harness side connector
terminal No.I45–3 and No.I45–7.
4. Using the temperature control lever, select FH for
the temperature.
Is the battery voltage applied on a regular interval basis
between the harness side connector terminal No.I45–6
(-) and No.I45–8 (+)?
—
Go to Step 3
Go to Step 2
2
Replace the auto air conditioner control unit.
—
Varify repair
—
3
Using the temperature control lever, select FC for the
temperature.
Is the battery voltage applied on a regular interval basis
between the harness side connector terminal No.I45–6
(+) and No.I45–8 (-)?
—
Go to Step 5
Go to Step 4
4
Replace the auto air conditioner control unit.
—
Verify repair
—
5
Is there continuity between the harness side connector
terminal No.I32–6 and No.I45–6?
—
Go to Step 7
Go to Step 6
6
Repair an open circuit between terminal No.I32–6 and
No.I45–6.
Is the action complete?
—
Go to Step 5
—
7
Is there continuity between the harness side connector
terminal No.I32–5 and No.I45–8?
—
Go to Step 9
Go to Step 8
8
Repair an open circuit between terminal No.I32–5 and
No.I45–8.
Is the action complete?
—
Verify repair
—
9
Replace the mix actuator.
Is the action complete?
—
Verify repair
—
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