DTC P0172 SYSTEM TOO RICH (BANK 1)
|
|
DTC P0172 SYSTEM TOO RICH (BANK 1)
|
DTC DETECTING CONDITION:
|
•
|
Two consecutive driving cycles with fault
|
|
•
|
GENERAL DESCRIPTION
|
TROUBLE SYMPTOM:
|
•
|
Poor driving performance
|
|
Important
|
|
After repair
or replacement of faulty parts, conduct Clear Memory Mode
and Inspection Mode
.
|
|
|
CHECK EXHAUST SYSTEM.
Are there holes or
loose bolts on exhaust system?
Repair exhaust system.
CHECK AIR INTAKE SYSTEM.
Are there holes,
loose bolts or disconnection of hose on air intake system?
Repair air intake system.
CHECK PURGE CONTROL SOLENOID VALVE OR PRESSURE CONTROL SOLENOID
VALVE.
Is the purge control solenoid valve or pressure
control solenoid valve stuck?
Replace the purge control solenoid valve
or pressure control solenoid valve.
CHECK FUEL PRESSURE.
Warning
|
|
•
|
Place “NO FIRE” signs
near the working area.
|
|
•
|
Be careful not to spill fuel on the floor.
|
|
|
|
|
|
Release fuel pressure.
Connect the connector to fuel pump relay.
Disconnect the fuel delivery hose from fuel filter,
and connect fuel pressure gauge.
Install the fuel filler cap.
Start the engine and idle while gear position is neutral.
Measure the fuel pressure while disconnecting pressure
regulator vacuum hose from intake manifold.
|
Warning
|
|
Before removing the fuel pressure
gauge, release fuel pressure.
|
|
|
|
|
|
|
Note
|
|
If fuel pressure does not increase,
squeeze fuel return hose 2 to 3 times, then measure fuel pressure
again.
|
Is the fuel pressure
284 — 314 kPa (2.9 — 3.2 kg/cm
2
,
41 — 46 psi)?
|
•
|
Repair the following items.
|
|
|
•
|
Clogged fuel return line or bent hose
|
|
|
•
|
Improper fuel pump discharge
|
|
|
•
|
Clogged fuel supply line
|
CHECK FUEL PRESSURE.
After connecting the pressure regulator vacuum hose, measure
fuel pressure.
|
Warning
|
|
Before removing the fuel pressure
gauge, release fuel pressure.
|
|
|
|
|
|
|
Note
|
|
•
|
If fuel pressure does not increase, squeeze fuel return
hose 2 to 3 times, then measure fuel pressure again.
|
|
•
|
If out of specification as measured at this step, check
or replace pressure regulator and pressure regulator vacuum hose.
|
Is the fuel pressure 206 — 235 kPa (2.1 — 2.4
kg/cm
2
, 30 — 34 psi)?
|
•
|
Repair the following items.
|
|
|
•
|
Faulty pressure regulator
|
|
|
•
|
Clogged fuel return line or bent hose
|
|
|
•
|
Faulty pressure regulator
|
|
|
•
|
Improper fuel pump discharge
|
|
|
•
|
Clogged fuel supply line
|
CHECK ENGINE COOLANT TEMPERATURE SENSOR.
Start the engine and warm-up completely.
Read the data of engine coolant temperature sensor
signal using Vehicle Diagnostic Interface
or OBD-II general scan tool.
|
Note
|
|
•
|
Vehicle Diagnostic Interface
For detailed operation procedure, refer to the “READ
CURRENT DATA FOR ENGINE”.
|
|
•
|
OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General
Scan Tool Instruction Manual.
|
Is the engine coolant temperature 70 — 100°C
(158 — 212°F)?
Replace the engine coolant temperature
sensor.
CHECK PRESSURE SENSOR SIGNAL.
Start the engine and warm-up engine until coolant temperature
is greater than 60°C (140°F).
Place the select lever in “N” or “P” range.
Turn the A/C switch to OFF.
Turn all accessory switches to OFF.
Read the data of pressure sensor signal using Vehicle
Diagnostic Interface or OBD-II general scan tool.
|
Note
|
|
•
|
Vehicle Diagnostic Interface
For detailed operation procedure, refer to the “READ
CURRENT DATA FOR ENGINE”.
|
|
•
|
OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General
Scan Tool Instruction Manual.
|
Idling: Is the measured value 24.0 — 41.3 kPa
(180 — 310 mmHg, 7.09 — 12.20 inHg), Ignition
ON: Is the measured value 73.3 — 106.6 kPa (550 — 800
mmHg, 21.65 — 31.50 inHg)?
Contact Service Center.
Replace the Pressure sensor.
