DTC P2096 POST CATALYST FUEL TRIM SYSTEM TOO LEAN BANK 1
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DTC P2096 POST CATALYST FUEL TRIM SYSTEM
TOO LEAN BANK 1
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CHECK ANY OTHER DTC ON DISPLAY.
Is any other
DTC displayed?
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Check DTC using “List
of Diagnostic Trouble Code (DTC)”.
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Note
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In this case, it is not necessary
to inspect DTC P0137.
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CHECK REAR OXYGEN SENSOR DATA.
Warm-up the engine until engine coolant temperature
is above 70°C (158°F), and keep the engine speed
at 5,000 rpm.
Read the data of rear oxygen sensor signal using Vehicle
Diagnostic Interface or OBD-II general scan tool.
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Note
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Vehicle Diagnostic Interface
For detailed operation procedure, refer to the “READ
CURRENT DATA SHOWN ON DISPLAY FOR ENGINE”.
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OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General
Scan Tool Instruction Manual.
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Is the voltage 490 mV?
CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.
Turn the ignition switch to OFF.
Disconnect the connectors from ECM and rear oxygen
sensor.
Measure the resistance of harness between ECM and rear
oxygen sensor connector.
Connector & terminal
(B137) No. 24 — (B19) No. 3:
(B136) No. C35 — (B19) No. 4:
Is the resistance more than 3 Ω?
Repair open circuit in harness between
ECM and rear oxygen sensor connector.
CHECK HARNESS BETWEEN REAR OXYGEN SENSOR AND ECM CONNECTOR.
Turn the ignition switch to OFF.
Disconnect the connector from rear oxygen sensor.
Turn the ignition switch to ON.
Measure the voltage between rear oxygen sensor harness
connector and engine ground or chassis ground.
Connector & terminal
(B19) No. 3 (+) — Engine ground (−):
Is the voltage 0.2 — 0.5 V?
Replace the rear oxygen sensor.
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Repair harness and connector.
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Note
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In this case, repair the following:
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Open circuit
in harness between rear oxygen sensor and ECM connector
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Poor contact in rear oxygen sensor connector
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Poor contact in ECM connector
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CHECK EXHAUST SYSTEM.
Check exhaust system parts.
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Note
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Check the following items.
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Loose
installation of portions
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Damage (crack, hole etc.) of parts
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Looseness and ill fitting of parts between front oxygen
(A/F) sensor and rear oxygen sensor
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Is there a fault in exhaust system?
Repair or replace faulty parts.
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
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Place “NO FIRE” signs
near the working area.
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Be careful not to spill fuel on the floor.
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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.
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Warning
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Before removing the fuel pressure
gauge, release fuel pressure.
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Note
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If fuel pressure does not increase,
squeeze fuel return hose 2 to 3 times, then measure fuel pressure
again.
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Is the fuel pressure
284 — 314 kPa (2.9 — 3.2 kg/cm
2
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41 — 46 psi)?
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Repair the following items.
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Clogged fuel return line or bent hose
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Improper fuel pump discharge
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Clogged fuel supply line
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CHECK FUEL PRESSURE.
After connecting the pressure regulator vacuum hose, measure
fuel pressure.
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Warning
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Before removing the fuel pressure
gauge, release fuel pressure.
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Note
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If fuel pressure does not increase, squeeze fuel return
hose 2 to 3 times, then measure fuel pressure again.
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If out of specification as measured at this step, check
or replace pressure regulator and pressure regulator vacuum hose.
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Is the fuel pressure 206 — 235 kPa (2.1 — 2.4
kg/cm
2
, 30 — 34 psi)?
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Repair the following items.
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Faulty pressure regulator
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Clogged fuel return line or bent hose
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Faulty pressure regulator
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Improper fuel pump discharge
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Clogged fuel supply line
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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.
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Note
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Vehicle Diagnostic Interface
For detailed operation procedure, refer to the “READ
CURRENT DATA FOR ENGINE”.
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OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General
Scan Tool Instruction Manual.
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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.
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Note
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Vehicle Diagnostic Interface
For detailed operation procedure, refer to the “READ
CURRENT DATA FOR ENGINE”.
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OBD-II general scan tool
For detailed operation procedures, refer to the OBD-II General
Scan Tool Instruction Manual.
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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.
