Nissan Primera P11. Instruction — part 254
4
CHECK FUEL PRESSURE
1. Release fuel pressure to zero.
Refer to EC-SR-31.
2. Install fuel pressure gauge and check fuel pressure.
At idling:
When fuel pressure regulator valve vacuum hose is connected.
235 kPa (2.35 bar, 2.4 kg/cm
2
, 34 psi)
When fuel pressure regulator valve vacuum hose is disconnected.
294 kPa (2.94 bar, 3.0 kg/cm
2
, 43 psi)
OK or NG
OK
©
GO TO 6.
NG
©
GO TO 5.
5
DETECT MALFUNCTIONING PART
Check the following.
I
Fuel pump and circuit Refer to EC-SR-316.
I
Fuel pressure regulator Refer to EC-SR-32.
I
Fuel lines Refer to “ENGINE MAINTENANCE” in MA section.
I
Fuel filter for clogging
©
Repair or replace.
6
CHECK MASS AIR FLOW SENSOR
With CONSULT-II
Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.
at idling: 2.5 - 5.0 g
⋅
m/sec
at 2,500 rpm: 7.1 - 12.5 g
⋅
m/sec
With GST
Check mass air flow sensor signal in MODE 1 with GST.
at idling: 2.5 - 5.0 g
⋅
m/sec
at 2,500 rpm: 7.1 - 12.5 g
⋅
m/sec
OK or NG
OK
©
GO TO 7.
NG
©
Check connectors for rusted terminals or loose connections in the mass air flow sensor
circuit or engine grounds. Refer to EC-SR-120.
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
(LEAN SIDE)
SR20DE
Diagnostic Procedure (Cont’d)
EC-215
7
CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Install all parts removed.
2. Start engine.
3. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-II.
NEF105A
4. Make sure that each circuit produces a momentary engine speed drop.
Without CONSULT-II
1. Install all parts removed.
2. Start engine.
3. Listen to each injector operating sound.
MEC703B
Clicking noise should be heard.
OK or NG
OK
©
GO TO 8.
NG
©
Perform trouble diagnosis for “INJECTORS”, EC-SR-304.
8
REMOVE INJECTOR
1. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
2. Turn ignition switch “OFF”.
3. Remove injector with fuel tube assembly. Refer to EC-SR-32.
Keep fuel hose and all injectors connected to injector gallery. The injector harness connectors should remain connected.
©
GO TO 9.
At idle
Suitable tool
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
(LEAN SIDE)
SR20DE
Diagnostic Procedure (Cont’d)
EC-216
9
CHECK INJECTOR
1. Disconnect all ignition coil harness connectors.
2. Place pans or saucers under each injector.
3. Crank engine for about 3 seconds. Make sure that fuel sprays out from injectors.
SEF595Q
Fuel should be sprayed evenly for each cylinder.
OK or NG
OK
©
GO TO 10.
NG
©
Replace injectors from which fuel does not spray out. Always replace O-ring with new
one.
10
CHECK INTERMITTENT INCIDENT
Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-SR-114.
©
INSPECTION END
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
(LEAN SIDE)
SR20DE
Diagnostic Procedure (Cont’d)
EC-217
On Board Diagnosis Logic
NCEC0192
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1 (front).
The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the
ECM judges the condition as a fuel injection system malfunction and lights up the MI (2 trip detection logic).
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Heated oxygen sensor 1 (front)
Density of oxygen in exhaust gas
(Mixture ratio feedback signal)
Fuel injec-
tion & mix-
ture ratio
control
Injectors
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0172
0172
I
Fuel injection system does not operate properly.
I
The amount of mixture ratio compensation is too large.
(The mixture ratio is too rich.)
I
Heated oxygen sensor 1 (front)
I
Injectors
I
Exhaust gas leaks
I
Incorrect fuel pressure
I
Mass air flow sensor
DTC Confirmation Procedure
NCEC0193
NOTE:
If “DTC Confirmation Procedure ” has been previously conducted,
always turn ignition switch “OFF” and wait at least 9 seconds
before conducting the next test.
TESTING CONDITION:
I
Always perform at a temperature above −10°C (14°F).
With CONSULT-II
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 9 seconds.
3)
Turn ignition switch “ON” and select “SELF-LEARN CON-
TROL” in “WORK SUPPORT” mode with CONSULT-II.
4)
Clear the self-learning control coefficient by touching “CLEAR”.
5)
Select “DATA MONITOR” mode with CONSULT-II.
6)
Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0172 should be detected at this stage, if a
malfunction exists. If so, go to “Diagnostic Procedure”, EC-SR-
221.
7)
If it is difficult to start engine at step 6, the fuel injection sys-
tem has a malfunction.
8)
Crank engine while depressing accelerator pedal. If engine
starts, go to “Diagnostic Procedure”, EC-SR-221. If engine
does not start, remove ignition plugs and check for fouling, etc.
SEF652Y
SEF058Y
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
(RICH SIDE)
SR20DE
On Board Diagnosis Logic
EC-218
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