Isuzu Trooper (1998-2002 year). Manual — part 501
6E–374
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1169 Fuel System Rich During Decel Fuel Cut Off (Bank2)
Step
Action
Value(s)
Yes
No
1
Was the “On-Board (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. Place the transmission in Park.
2. Using a Tech 2, HO2S 2 voltage while running warm
engine75 C – 95 C (167 F – 203 F) at 1200 RPM.
3. HO2S 1 voltages should vary within the specified
range. (100 – 900mV)
4. Quickly open the wide open the throttle for a few
seconds.
Did the voltage suddenly rise toward the low end of the
specified range?
100 – 600 mV
Go to
OBD
System
Check
Go to
Step 4
4
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 – 325Kpa
(41 – 46psi)
Go to
OBD
System
Check
Go to
Step 5
5
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 value?
Is the fuel pressure gauge reading near the specified
value?
325KPa
(46psi)
414KPa
(60psi)
Check the
Procedure
Refer to
Diagnostic
Aids
Go to
Step 6
6
Check the following items;
D
Faulty fuel pump
D
Incorrect fuel pump
D
Incorrect fuel being used
D
Cold fuel.
If a problem is found, repair one as necessary.
Was a problem found?
—
Verify repair
—
6E–375
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1171 Fuel System Lean During Acceleration
D06R200010
Circuit Description
The powertrain control module (PCM) internal circuitry
can identify if the vehicle fuel system is capable of
supplying adequate amounts of fuel during heavy
acceleration (power enrichment). The PCM monitors the
voltage of the oxygen sensor during power enrichment.
When a power enrichment mode of operation is
requested during “closed loop” operation (by heavy
acceleration), the PCM will provide more fuel to the
engine. Under these conditions the PCM should detect a
“rich” condition (high oxygen sensor voltage). If this “rich”
exhaust is not detected at this time, a DTC P1171 will set.
A plugged fuel filter, restricted fuel line, restricted in-tank
filter or defective fuel pump can prevent adequate
amounts of fuel from being supplied during power
enrichment mode.
Conditions for Setting the DTC
D
No related DTCs.
D
Engine is operating in “closed loop power enrichment”
mode for 3 seconds.
D
Engine coolant temperature is above 60
°
C (140
°
F).
D
While in “power enrichment” mode the oxygen sensor
voltage remains below 400 mV for 3 seconds.
Action Taken When the DTC Sets
D
The PCM will not turn the malfunction indicator lamp
(MIL) “ON”.
D
The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
D
The PCM will turn the MIL “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P1171 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
D
DTC P1171 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
D
A restricted fuel filter or fuel line, restricted in-tank filter,
or a defective fuel pump may supply adequate
amounts of fuel at idle, but may not be able to supply
enough fuel during heavy acceleration.
D
Water or alcohol in the fuel may cause low HO2S
voltage during acceleration.
D
Check for faulty or plugged fuel injector(s).
D
Check for low fuel.
6E–376
6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS
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 280-320
kPa.
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 too 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
Electrical Test
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
6E–377
6VE1 3.5L 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?
325 kPa
(46 psi)
414 kPa
(60 psi)
Check the
Procedure
Refer to
Diagnostic
Aids
Go to
Step 8
8
Check for:
D
Faulty fuel pump
D
Restricted fuel pump strainer (sock)
D
Incorrect fuel pump
D
Incorrect fuel being used
D
Hot fuel
Is the action complete?
—
Verify repair
—
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