DTC P0140:00 [SKYACTIV-G 2.0]

id0102h1702700

DTC P0140:00

HO2S circuit no activity detected
DETECTION CONDITION
•  The PCM monitors the input voltage from the HO2S when the following conditions are met. Under the following monitoring conditions, if the input voltage from the HO2S does not exceed 0.75 V even though the short term fuel trim is controlled up to 10 % for specified period, the PCM determines that the HO2S circuit is not activated.
MONITORING CONDITIONS
―  Drive Mode 03 (Variable Valve Timing, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode)
―  Estimated temperature of the zirconia element inside the HO2S above 450 °C {842 °F}
Diagnostic support note
•  This is an intermittent monitor (A/F sensor, HO2S).
•  The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
•  PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
•  The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION
—
POSSIBLE CAUSE
•  Erratic signal from HO2S
―  HO2S loose
―  Exhaust system leakage
―  HO2S connector or terminals malfunction
•  HO2S heater malfunction
•  Short to ground in wiring harness between HO2S terminal A and PCM terminal 2AI
•  PCM connector or terminals malfunction
•  Open circuit in wiring harness between HO2S terminal A and PCM terminal 2AI
•  HO2S malfunction
―  HO2S deterioration
•  Engine malfunction
―  Insufficient engine compression
―  Engine coolant leakage to combustion chamber
•  PCM malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA (MODE 2)
•  Perform the Freeze Frame PID Data Access Procedure.
•  Is the DTC P0140:00 on FREEZE FRAME DATA (Mode 2)?
Yes
Go to the next step.
No
Go to the troubleshooting procedure for DTC on FREEZE FRAME DATA (Mode 2).
(See DTC TABLE [SKYACTIV-G 2.0].)
2
VERIFY FREEZE FRAME DATA (MODE 2)/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
•  Have the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (A/F sensor, HO2S related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 2)/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
3
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
4
VERIFY RELATED PENDING CODE AND/OR DTC
Note
•  If the fuel monitor, DTC P0132:00 is retrieved, ignore it until DTC P0140:00 is fixed.
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Are any other PENDING CODEs and/or DTCs present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0].)
No
Go to the next step.
5
INSPECT CURRENT SIGNAL STATUS OF HO2S
•  Inspect the HO2S.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 13.
6
INSPECT INSTALLATION OF HO2S
•  Inspect installation of HO2S.
•  Is the HO2S installed securely?
Yes
Go to the next step.
No
Retighten the HO2S, then go to Step 15.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
7
INSPECT EXHAUST SYSTEM FOR LEAKAGE
•  Visually inspect for exhaust leakage between exhaust manifold and HO2S.
•  Is there any leakage?
Yes
Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
No
Go to the next step.
8
INSPECT HO2S CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the HO2S connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 15.
No
Go to the next step.
9
INSPECT HO2S HEATER
•  Inspect the HO2S heater.
•  Is there any malfunction?
Yes
Replace the HO2S, then go to Step 15.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Go to the next step.
10
INSPECT HO2S SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Verify that the HO2S connector is disconnected.
•  Inspect for continuity between HO2S terminal A (wiring harness-side) and body ground.
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 15.
No
Go to the next step.
11
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 15.
No
Go to the next step.
12
INSPECT HO2S SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Verify that the HO2S and PCM connectors are disconnected.
•  Inspect for continuity between HO2S terminal A (wiring harness-side) and PCM terminal 2AI (wiring harness-side).
•  Is there continuity?
Yes
Replace the HO2S, then go to Step 15.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Repair or replace the wiring harness for a possible open circuit, then go to Step 15.
13
INSPECT ENGINE COMPRESSION
•  Inspect the engine compression.
•  Are compression pressures within specification?
Specification:
•  Standard: 827 kPa {8.43 kgf/cm2, 120 psi} (300 rpm)
•  Minimum: 661 kPa {6.74 kgf/cm2, 95.9 psi} (300 rpm)
•  Maximum difference between cylinders: 140 kPa {1.43 kgf/cm2, 20.3 psi}
Note
•  Because the SKYACTIV-G 2.0 retards the intake valve closing timing, compression pressure is low.
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
14
INSPECT SEALING OF ENGINE COOLANT PASSAGE
•  Perform the “ENGINE COOLANT LEAKAGE INSPECTION”.
•  Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?
Yes
Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred.
•  Verify the conditions of the gasket and the cylinder head.
―  If there is any malfunction:
•  Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
No
Go to the next step.
15
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Perform the Drive Mode 03 (Variable Valve Timing, A/F Sensor Heater, HO2S Heater, A/F Sensor, HO2S and TWC Repair Verification Drive Mode).
•  Is the PENDING CODE for this DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
16
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0].)
No
DTC troubleshooting completed.