Isuzu 2000 Trooper Workshop Manual page 152

Chart B: Mode Actuator Control Failure
Step
1 Turn on the ignition switch (the engine is run).
Dose the mode actuator fully stroke when the defrost
mode and the vent mode are selected?
2 Repair or replace the mode door or the link unit.
Is the action complete?
3 Is there continuity between the harness side connector
terminal No.B69–9 and No.I33–11?
4 Repair an open circuit between terminal No.B69–9 and
No.I33–11.
Is the action complete?
5 Is there continuity between the harness side connector
terminal No.B69–3 and No.I33–10?
6 Repair an open circuit between terminal No.B69–3 and
No.I33–10.
Is the action complete?
7 Is there continuity between harness side connector
terminal No.B69–4 and No.I33–8?
8 Repair an open circuit between terminal No.B69–4 and
No.I33–8.
Is the action complete?
9 Is sum of the voltage between the following harness
side connector terminal approximately 5V? Voltage
between No.I33–8 and No.I33–10 plus voltage
between No.I33–8 and No.I33–11
10 Replace the actuator.
Is the action complete?
11 Dose the mode actuator work normally through manual
operation?
12 Replace the sensor.
Is the action complete?
13 Replace the auto air conditioner control unit.
Is the action complete?
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–123
Action Value(s) Yes
— Go to Step 3
— Go to Step 1
— Go to Step 5
— Go to Step 3
— Go to Step 7
— Go to Step 5
— Go to Step 9
— Go to Step 7
5V Go to Step 11
— Verify repair
— Go to Step 13
— 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
—
Go to Step 12
—
—