Isuzu 2000 Trooper Workshop Manual page 149

1A–120 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart B: Mix Actuator Control Failure
Step
1 Turn the ignition switch (the engine is run).
Dose the mix actuator fully stroke when FH and FC of
the temperature control lever?
2 Repair or replace the air mix door or the link unit.
Is the action complete?
3 Is there continuity between the harness side connector
terminal No.I45–3 and No.I33–11?
4 Repair an open circuit between terminal No.I45–3 and
No.I33–11.
Is the action complete?
5 Is there continuity between harness side connector
terminal No.I45–7 and No.I33–5?
6 Repair an open circuit between terminal No.I45–7 and
No.I33–5.
Is the action complete?
7 Is there continuity between the harness side connector
terminal No.I45–2 and No.I33–15?
8 Repair an open circuit between terminal No.I45–2 and
No.I33–15.
Is the action complete?
9 Is sum of the voltage between the following chassis
harness side connector terminals approximately 5V?
No.I33–15 and No.I33–5, No.I33–5 and No.I33–11
10 Replace the actuator.
Is the action complete?
11 Replace the auto air conditioner control unit.
Is the action complete?
Action Value(s) Yes
— Go to Step 3
— Varify repair
— Go to Step 5
— Go to Step 3
— Go to Step 7
— Go to Step 5
— Go to Step 9
— Go to Step 7
— Go to Step 11
— Verify repair
— Verify repair
No
Go to Step 2
—
Go to Step 4
—
Go to Step 6
—
Go to Step 8
—
Go to Step 10
—
—