Opel Frontera UE. Manual - part 231

6E1–222

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) P1171 FUEL SYSTEM LEAN DURING

ACCELERATION

D06RX119

Circuit Description

The engine control module (ECM) internal circuitry can
identify if the vehicle fuel system is capable of supplying
adequate amounts of fuel during heavy acceleration
(power enrichment). The ECM 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
ECM will provide more fuel to the engine. Under these
conditions the ECM should detect a ”rich” condition (high
oxygen sensor voltage). If this ”rich” exhaust is not
detected at this time, a Diagnostic Trouble Code P1171
will set. A plugged fuel filter or restricted fuel line can
prevent adequate amounts of fuel from being supplied
during power enrichment mode.  DTC P1171 is a type A
code.

Conditions for Setting the DTC

D

No related Diagnostic Trouble Codes.

D

Engine is operating in ”Closed Loop”.

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 ECM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

D

The ECM will store conditions which were present
when the Diagnostic Trouble Code was set as Freeze
Frame and in the Failure Records data.

Conditions for Clearing the MIL/DTC

D

The ECM 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 Diagnostic Trouble Code P1171 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.

D

Diagnostic Trouble Code P1171 can be cleared by
using the Scan Tool’s ”Clear Info” function.

Diagnostic Aids

D

A restricted fuel filter or fuel line can 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.

6E1–223

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

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. During ”power
enrichment” mode, more fuel is needed and the
HO2S voltage should rise above 447 mV. This step
checks to see if the HO2S is operating properly.

5. Wrap a shop towel around the fuel pressure

connector to absorb any small amount of fuel
leakage that may occur when installing the gauge.
Ignition ON, pump pressure should be 235–320
kPa.

7. Add Caution: Use correct pliers so damage to fuel

lines will not occur.

6E1–224

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

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 Diagnostic Trouble Codes
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. Using a Tech 2, observe HO2S 1 voltage while

running warm engine(75

°

C–95

°

C [167

°

F–203

°

F])

at 1200 RPM.

2. HO2S 1 voltage should vary within the specified

range.

Does the voltage toggle back and forth within the
specified range?

100– 900 mV

Go to

Diagnostic

Aids 

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?

284– 325 kPa

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 

7

1. Ignition OFF.
2. Ignition ON, engine OFF.
3. Using a Tech 2, enable the fuel pump to operate.
4. Using pliers, slowly close the return line (do not

exceed the first specified value).

Using the pliers, can the fuel pressure be manipulated
to exceed the second specified value?

414 kPa 325

kPa

Go 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

—

Verify repair

—

6E1–225

X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIAGNOSTIC TROUBLE CODE (DTC) 1404 EXHAUST GAS RECIRCULATION

(EGR) CLOSED VALVE

D06RX113

Circuit Description

The engine control module (ECM) monitors the exhaust
gas recirculation(EGR) valve pintle position input to
ensure that the valve responds properly to commands
from the ECM to detect a fault if the pintle position sensor
and control circuits are open or shorted. If the ECM
detects a pintle position signal voltage below the normal
range of the pintle position sensor, or a signal voltage that
is not within a tolerance considered acceptable for proper
EGR control system operation, the ECM will set a DTC
P1404.

Conditions for Setting the DTC

D

IAT is above 5

°

C (41

°

)

D

EGR actual position is 16 counts below the EGR low
threshold for at least 6.3 seconds.

Action Taken When the DTC Sets

D

The ECM will illuminate the Malfunction Indicator Lamp
(MIL) after the second consecutive trip in which the
fault is detected.

D

The ECM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.

Conditions for Clearing the MIL/DTC

D

The ECM 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 P1404 will clear after 40 consecutive
warm up cylcles without a fault.

D

DTC P1404 can be cleared by using the Scan Tool’s
”Clear Info” function.

Diagnostic Aids

Check for the following conditions:

D

Excessive deposits on EGR valve pintle or seat –
Check for deposits that may interfere with the EGR
valve pintle extending completely or cause the pintle to
stick.

D

Poor connection or damaged harness – Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the EGR actual position display on the
Tech 2 while moving connectors and wiring harnesses
related to the EGR valve. A change in the display will
indicate the location of the fault.

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.

NOTE: If the EGR valve show signs of excessive heat,
check the exhaust system for blockage (possible a
plugged catalytic converter) using the ”Restricted
Exhaust System Check”.