Infiniti QX4 (R50). Manual — part 209
SEF960Y
WITH GST
NBEC0174S02
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch “OFF” and wait at least 10 seconds.
3)
Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 5 seconds at idle speed.
4)
Stop engine and reconnect mass air flow sensor harness con-
nector.
5)
Select “MODE 7” with GST. Make sure 1st trip DTC P0100 is
detected.
6)
Select “MODE 4” with GST and erase the 1st trip DTC P0100.
7)
Start engine again and let it idle for at least 10 minutes.
8)
Select “MODE 7” with GST. The 1st trip DTC P0172 or P0175
should be detected at this stage, if a malfunction exists. If so,
go to “Diagnostic Procedure”, EC-306.
9)
If it is difficult to start engine at step 7, the fuel injection sys-
tem has a malfunction.
10) Crank engine while depressing accelerator pedal.
If engine starts, go to “Diagnostic Procedure”, EC-306. If
engine does not start, check exhaust and intake air leak visu-
ally.
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2) FUEL INJECTION SYSTEM
FUNCTION (RICH)
DTC Confirmation Procedure (Cont’d)
EC-303
Wiring Diagram
NBEC0175
RIGHT BANK
NBEC0175S01
MEC955C
DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2) FUEL INJECTION SYSTEM
FUNCTION (RICH)
Wiring Diagram
EC-304
LEFT BANK
NBEC0175S02
MEC956C
GI
MA
EM
LC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2) FUEL INJECTION SYSTEM
FUNCTION (RICH)
Wiring Diagram (Cont’d)
EC-305
Diagnostic Procedure
NBEC0176
1
CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before three way catalyst.
SEF099P
OK or NG
OK
©
GO TO 2.
NG
©
Repair or replace.
2
CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace.
3
CHECK HEATED OXYGEN SENSOR 1 (FRONT) CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect corresponding heated oxygen sensor 1 (front) harness connector.
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.
MTBL0479
Continuity should exist.
5. Check harness continuity between ECM terminal or HO2S1 terminal and ground as follows.
Refer to Wiring Diagram.
MTBL0480
Continuity should not exist.
6. Also check harness for short to power.
OK or NG
OK
©
GO TO 4.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0172 (RIGHT, -B1), P0175 (LEFT, -B2) FUEL INJECTION SYSTEM
FUNCTION (RICH)
Diagnostic Procedure
EC-306
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