Isuzu Rodeo UE. Service manual — part 326
6E2–59
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis
(Cont'd)
Step
No
Yes
Value(s)
Action
4
IMPORTANT: Before continuing with the diagnosis, the
following conditions must be met:
f
The intake air temperature must be greater than
15
°
C. (60
°
F).
f
The engine coolant temperature must be less
than 119
°
C (246
°
F).
1. A/C “OFF.”
2. Start the engine and idle for 1 minute.
3. Observe the A/C compressor.
Is the A/C compressor clutch engaged even though
A/C has not been requested?
—
Go to
Step 45
Go to
Step 5
5
1. Idle the engine.
2. A/C “ON”.
3. Blower “ON”.
4. Observe the A/C compressor.
Is the A/C compressor magnetic clutch engaged?
—
Refer to
Diagnostic
Aids
Go to
Step 6
6
1. Engine idling.
2. A/C “ON”.
3. Blower “ON”.
4. Observe the “A/C Request” display on the Tech 2.
(Refer to the miscelluneous test)
Does the “A/C Request” display indicate “Yes?”
—
Go to
Step 34
Go to
Step 7
7
Temporarily substitute the A/C compressor relay in
place of the A/C thermostat relay, then repeat Step 5.
Did the “A/C Request” display indicate “Yes?”
—
Go to
Step 8
Go to
Step 9
8
Replace the original A/C thermostat relay.
Is the action complete?
—
Verify repair
—
9
Dose the blower operate?
—
Go to
Step 10
Go to
Step 11
10
Repair the blower.
Is the action complete?
—
Verify repair
—
11
Check for a faulty 10A A/C fuse in the passenger
compartment fuse panel.
Was the 10A fuse OK?
—
Go to
Step 13
Go to
Step 12
12
Check for short circuit and make repairs if necessary.
Replace the 10A A/C fuse.
Is the action complete?
—
Verify repair
—
13
1. Ignition “ON.”
2. Use a DVM to check voltage at the positive A/C
switch wire (BRN).
Was voltage equal to the specified value?
B+
Go to
Step 15
Go to
Step 14
14
Repair the open wire (BRN) between the A/C switch
and the A/C fuse.
Is the action complete?
—
Verify repair
—
6E2–60
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis
(Cont'd)
Step
No
Yes
Value(s)
Action
15
1. Remove the glove box to gain access to the A/C
thermostat.
2. Disconnect the thermostat connector.
3. Attach a fused jumper between ground and the
GRN/RED wire at the thermostat.
4. A/C “ON.”
5. Blower “ON.”
Dose A/C request indicate “YES” on the Tech 2?
—
Go to
Step 16
Go to
Step 23
16
1. Ignition “ON.”
2. A/C switch “ON”.
3. Use a DVM to check voltage at the electronic A/C
thermostat.
Was voltage equal to the specified value?
B+
Go to
Step 20
Go to
Step 17
17
Check for an open (LT GRN/BLK) wire between the
thermostat and the A/C switch.
Was the wire open?
—
Go to
Step 18
Go to
Step 19
18
Repair the open wire (LT GRN/BLK) between the
thermostat and the A/C switch.
Is the action complete?
—
Verify repair
—
19
Replace the A/C switch.
Is the action complete?
—
Verify repair
—
20
Use an ohmmeter to check continuity between the
electronic A/C thermostat and the blower switch.
Was there an open circuit?
—
Go to
Step 21
Go to
Step 22
21
Repair the open wire (WHT) between the thermostat
and the blower switch.
Is the action complete?
—
Verify repair
—
22
Replace the electronic A/C thermostat.
Is the an action complete?
—
Verify repair
—
23
Check for an open circuit between A/C thermostat relay
and PCM A/C request terminal (E-15).
Was there an open circuit?
—
Go to
Step 24
Go to
Step 25
24
Repair the open circuit between the PCM and A/C
thermostat relay.
Is the action complete?
—
Verify repair
—
25
Check for an open circuit between the engine device
fuse and the A/C thermostat relay (WHT/GRN).
Was there an open circuit?
—
Go to
Step 26
Go to
Step 27
26
Repair the open circuit between the engine device fuse
and the A/C thermostat relay.
Is the action complete?
—
Verify repair
—
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?
B+
Go to
Step 29
Go to
Step 28
6E2–61
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis
(Cont'd)
Step
No
Yes
Value(s)
Action
28
Repair the open circuit between the 10A A/C fuse and
the pressure switch.
Is the action complete?
—
Verify repair
—
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?
—
Go to
Step 30
Go to
Step 31
30
Repair the open circuit between the pressure switch
and the A/C thermostat relay.
Is the action complete?
—
Verify repair
—
31
Check for damaged pin or terminal at E-15 of the PCM.
Was a damaged pin or terminal found?
—
Go to
Step 32
Go to
Step 33
32
Repair the damaged pin or terminal.
Is the action complete?
—
Verify repair
—
33
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module Sensors for procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
—
Verify repair
—
34
1. Remove the A/C compressor relay.
2. Ignition “ON.”
3. Use a DVM to check voltage at both of the BRN
wires at the A/C compressor relay socket.
Is the voltage equal to the specified value?
B+
Go to
Step 36
Go to
Step 35
35
Repair the faulty BRN wire between the A/C fuse and
the A/C compressor relay .
Is the action complete?
—
Verify repair
—
36
1. A/C compressor relay removed.
2. Engine idling.
3. A/C “ON.”
4. Blower “ON.”
5. Use a DVM to measure voltage between the
GRY/RED wire at the A/C compressor relay socket
and battery+.
Did the DVM indicate the specified value?
B+
Go to
Step 40
Go to
Step 37
37
Check for an open GRY/RED wire between PCM
terminal B-14 and the A/C compressor relay.
Was the wire open?
—
Go to
Step 38
Go to
Step 39
38
Repair the open GRY/RED wire between the PCM and
the A/C compressor relay.
Is the action complete?
—
Verify repair
—
6E2–62
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
A/C Clutch Control Circuit Diagnosis
(Cont'd)
Step
No
Yes
Value(s)
Action
39
Check for a damaged pin or terminal at B-14 of the
PCM.
Was a damaged pin or a terminal found?
—
Go to
Step 32
Go to
Step 33
40
1. A/C compressor relay removed.
2. Connect a fused jumper at the A/C compressor
relay socket between either BRN wire and the
BRN/YEL wire.
3. Engine idling.
4. A/C “ON.”
5. Blower “ON.”
Did the compressor magnetic clutch engage?
—
Go to
Step 41
Go to
Step 42
41
Repair the A/C compressor relay.
Is the action complete?
—
Verify repair
—
42
Check for an open circuit between the A/C compressor
relay and the A/C clutch.
Was an open circuit found?
—
Go to
Step 43
Go to
Step 44
43
Repair the open circuit between the compressor Clutch
and the A/C compressor relay.
Is the action complete?
—
Verify repair
—
44
Service the compressor clutch or replace the
compressor due to a faulty internal overheat switch.
Is the action complete?
—
Verify repair
—
45
1. Remove the A/C compressor relay.
2. Idle the engine.
Is the compressor clutch still engaged when A/C is not
selected?
—
Go to
Step 46
Go to
Step 47
46
Repair the short to voltage between the A/C clutch and
A/C compressor relay.
Is the action complete?
—
Verify repair
—
47
1. Reinstall the A/C compressor relay.
2. Remove the A/C thermostat relay.
3. Engine idling.
Is the compressor clutch still engaged when A/C is not
selected?
—
Go to
Step 48
Go to
Step 50
48
Use a DVM to check for a short to ground between the
A/C compressor relay and B-14 of the PCM.
Was a short detected?
—
Go to
Step 49
Go to
Step 33
49
Repair the short to ground between the PCM and A/C
compressor relay.
Is the action complete?
—
Verify repair
—
50
Repair the short to ground between the A/C thermostat
relay and the electronic thermostat.
Is the action complete?
—
Verify repair
—
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