Isuzu Rodeo UE. Manual — part 410
6E2–395
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
f
DTC P1171 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
f
A restricted fuel filter or fuel line, restricted in-tank filter,
or a defective fuel pomp may supply adequate
amounts of fuel at idle, but may not be able to supply
enough fuel during heavy acceleration.
f
Water or alcohol in the fuel may cause low HO2S
voltage during acceleration.
f
Check for faulty or plugged fuel injector(s).
f
Check for low fuel.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
4. When the engine is idling or at steady cruise, the
HO2S voltage should vary from between
approximately 100 mV to 900 mV. It is possible to
measure a satisfactory fuel pressure at idle even
though the pressure may drop at high flow
requirements. It may be necessary to watch fuel
pressure at high engine load.
5. Wrap a shop towel around the fuel pressure
connector to absorb any small amount of fuel
leakage that may occur when installing gauge.
Ignition “ON,” pump pressure should be
280-320kPa.
7. Add Caution: Use correct pliers so damage to fuel
lines will not occur.
DTC P1171 – Fuel System Lean During Acceleration
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
Are any component-related DTCs set?
—
Go to
component
DTC charts
Go to
Step 3
3
1. Check the vehicle’s fuel tank for an adequate
amount of fuel.
2. Add fuel to the vehicle’s fuel tank if the tank is almost
empty.
Was fuel added to the vehicle’s fuel tank?
—
Go to
Step 4
Go to
Step 5
4
1. Place the transmission in park.
2. Using a Tech 2, observe HO2S 1 voltage while
running warm engine 75
°
C-95
°
C (167
°
F-203
°
F) at
1200 RPM.
3. HO2S 1 voltage should vary within the specified
range.
4. Quickly open the throttle halfway for a few seconds.
Did the voltage suddenly rise toward the high end of the
specified range?
100-900 mV
Go to
Fuel
System
Diagnosis
Go to
Step 5
5
1. Disconnect the fuel pump relay and crank the
engine to relieve the fuel pressure.
2. Install the fuel pressure gauge.
3. Start the engine and idle at normal operating
temperature.
4. Disconnect the vacuum line going to the fuel
pressure regulator.
With the engine running, is the fuel pressure within the
specified range?
280-325 kPa
(41-46 psi)
Go to
OBD
System
Check
Go to
Step 6
6
Check for restricted fuel lines or restricted in-line filter.
Was a problem found?
—
Verify repair
Go to
Step 7
6E2–396
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1171 – Fuel System Lean During Acceleration
(Cont'd)
Step
No
Yes
Value(s)
Action
7
1. Ignition “OFF.”
2. Remove the fuel pump relay and replace it with a
fused jumper which will connect the relay’s battery
terminal to the terminal leading to the fuel pump
fuse.
3. While the fuel pump is operating, use pliers to slowly
close the return line (do not exceed the first
specified value).
Using the pliers to restrict the return line, can the fuel
pressure be manipulated to exceed the second
specified value?
414 kPa (60
psi) 325 kPa
(46 psi)
Go to
Diagnostic
Aids
Go to
Step 8
8
Check for:
f
Faulty fuel pump
f
Restricted fuel pump strainer (sock)
f
Incorrect fuel pump
f
Incorrect fuel being used
f
Hot fuel
Is the action complete?
—
Verify repair
—
6E2–397
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1380 ABS Rough Road ABS System Fault
Circuit Description
The powertrain control module (PCM) monitors ABS fault
signal. When PCM receives fault signal, PCM will set
DTC P1380.
Conditions for Setting the DTC
f
Vehicle speed is more than 5 mph.
f
Load is less than 99%.
f
Engine revolution is less than 6250 rpm.
f
PCM receives ABS fault signals from ABS unit.
f
Ignition on.
f
Misfire DTCs exist.
f
100 test failures within 120 test samples.
Action Taken When the DTC Sets
f
The PCM will store DTC 1380 only, no MIL turn on.
Conditions for Clearing the MIL/DTC
f
A history DTC P1380 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
f
DTC 1380 can be cleared by using Tech-II or
disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:
f
PCM and ABS communication line short circuit to other
line may cause faulty signal. Inspect communication
line.
f
Follow ABS ECU diagnosis procedure, refer to ABS
procedure page.
DTC P1380 – ABS Rough Road ABS System Fault
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Ignition “ON,” engine “OFF”, review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor “DTC” info for DTC P1380
and Misfire DTCs until the DTC P1380 and Misfire
DTCs test runs. Note the result.
Does the Tech 2 indicates DTC P1380 and Misfire
DTCs failed this ignition?
—
Refer to ABS
diagnosis
After inspecting
ABS, repeat
Step 2
If problem still
exists, go to
Step 3
Clear DTC by
Tech 2
3
Check short circuit among communication line of
PCM/ABS and others.
Does short circuit exist?
—
Repair wiring
Verify repair
Go to
Step 4
4
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module and 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
—
6E2–398
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1381 ABS Rough Road Class 2 Serial Link
Error
Circuit Description
The powertrain control module (PCM) monitors no ABS
signal. When PCM does not receive ABS signal, PCM will
set DTC P1381.
Conditions for Setting the DTC
f
PCM does not receive ABS signals from ABS ECU.
f
Vehicle speed is more than 0 mph.
f
Load is less than 99%.
f
Engine revolution is less than 6250rpm.
f
2.5 second after key on.
f
Misfire DTCs exist.
f
100 test failures within 120 test samples.
Action Taken When the DTC Sets
f
The PCM will store DTC 1381 only, MIL on.
Conditions for Clearing the MIL/DTC
f
A history code DTC P1381 will clear after 40
consecutive warm-up cycles have occurred without a
fault.
f
DTC P1381 can be cleared by Tech-II or by
disconnecting the PCM battery feed.
Diagnostic Aids
Check for the following conditions:
f
Inspect open circuit of communication wire between
ABS ECU and PCM.
f
Follow ABS ECU diagnosis procedure.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
DTC P1381 – ABS Rough Road Class 2 Serial Link Error
Step
Action
Value(s)
Yes
No
1
Was the “On-Board Diagnostic (OBD) System Check”
performed?
—
Go to
Step 2
Go to
OBD
System
Check
2
1. Ignition “ON,” engine “OFF”, review and record
Tech 2 Failure Records Data.
2. Operate the vehicle within Failure Records
conditions as noted.
3. Using a Tech 2, monitor “DTC inf. for DTC P1381
and Misfire DTCs until the DTC P1381 and Misfire
DTCs test runs. Note the result.
Does the Tech 2 indicates DTC P1381 and Misfire
DTCs failed this ignition?
—
Refer to ABS
diagnosis
After inspecting
ABS, repeat
Step 2
If problem still
exists, go to
Step 3
Clear DTC by
Tech 2
3
Check open circuit among communication line of
PCM/ABS and others.
Does short circuit exist?
—
Repair wiring
Verify repair
Go to
Step 4
4
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed. Refer to
On-Vehicle Service in
Powertrain Control Module and 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
—
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