Isuzu Trooper 1999 Workshop Manual page 863

6E–62
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis (Cont'd)
Step
19 Replace the A/C switch.
Is the action complete?
20 Use an ohmmeter to check continuity between the
electronic A/C thermostat and the blower switch.
Was there an open circuit?
21 Repair the open wire (GRN/YEL) between the
thermostat and the blower switch.
Is the action complete?
22 Replace the electronic A/C thermostat.
Is the an action complete?
23 Check for an open circuit between A/C thermostat relay
and PCM A/C request terminal (E-15).
Was there an open circuit?
24 Repair the open circuit between the PCM and A/C
thermostat relay.
Is the action complete?
25 Check for an open circuit between the A/C switch (LT
GRN) and the A/C thermostat relay (LT GRN).
Was there an open circuit?
26 Repair the open circuit between the A/C switch and the
A/C thermostat relay.
Is the action complete?
27 1. Ignition "ON."
2. Use a DVM to check voltage at the A/C pressure
switch (BRN).
Was voltage equal to the specified value?
28 Repair the open circuit between the 10A A/C fuse and
the pressure switch.
Is the action complete?
29 Use an ohmmeter to check continuity between the
pressure switch (GRN/WHT) and the A/C thermostat
relay (GRN/WHT).
Was the circuit open?
30 Repair the open circuit between the pressure switch
and the A/C thermostat relay.
Is the action complete?
31 Check for damaged pin or terminal at E-15 of the PCM.
Was a damaged pin or terminal found?
32 Repair the damaged pin or terminal.
Is the action complete?
Action Value(s) Yes
— Verify repair
— Go to Step 21
— Verify repair
— Verify repair
Go to Step 24
—
— Verify repair
— Go to Step 26
— Verify repair
+B Go to Step 29
— Verify repair
— Go to Step 30
— Verify repair
— Go to Step 32
— Verify repair
No
—
Go to Step 22
—
—
Go to Step 25
—
Go to Step 27
—
Go to Step 28
—
Go to Step 31
—
Go to Step 33
—