P014C
FA20 ENGINE CONTROL: SFI SYSTEM: P014C, P014D, P015A, P015B; A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1; 2013 MY FR-S [03/2012 -]
P014C - A/F Sensor Slow Response - Rich to Lean Bank 1 Sensor 1
P014D - A/F Sensor Slow Response - Lean to Rich Bank 1 Sensor 1
P015A - A/F Sensor Delayed Response - Rich to Lean Bank 1 Sensor 1
P015B - A/F Sensor Delayed Response - Lean to Rich Bank 1 Sensor 1
DESCRIPTION
Refer to DTC P2195 P2195.
*: Calculated by ECM based on the air fuel ratio sensor output.
MONITOR DESCRIPTION
The ECM monitors the time required for the A/F sensor output to change from Rich to Lean, or from Lean to Rich. When "Rich to Lean response rate deterioration level" or "Rich to Lean delay level" exceeds the threshold, the ECM stores a DTC and illuminates the MIL.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
P015A, P015B (Symmetric delayed start)
TYPICAL MALFUNCTION THRESHOLDS
P014C (Asymmetric slow response)
P014D (Asymmetric slow response)
P014C, P014D (Symmetric slow response)
P015A (Asymmetric delayed start)
P015B (Asymmetric delayed start)
P015A, P015B (Symmetric delayed start)
MONITOR RESULT
Refer to Checking Monitor Status Mode 6 Data.
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation) Reading and Clearing Diagnostic Trouble Codes.
4. Turn the ignition switch off and wait for at least 30 seconds.
5. Turn the ignition switch to ON and turn the Techstream on.
6. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
HINT
Check the engine coolant temperature is 20°C (68°F) or less at engine started.
7. Perform the following the confirmation driving pattern.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
a. Drive the vehicle at 80 km/h (50 mph) or more for 20 minutes or more [A].
b. Stop the vehicle.
c. Idle the engine for 1 minute or more [B].
8. Enter the following menus: Powertrain / Engine / Trouble Codes.
9. Read pending DTCs.
HINT
* If a pending DTC is output, the system is malfunctioning.
* If a pending DTC is not output, perform the following procedure.
10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
11. Input the DTC: P014C, P014D, P015A or P015B.
12. Check the DTC judgment result.
HINT
* If the judgment result shows NORMAL, the system is normal.
* If the judgment result shows ABNORMAL, the system has a malfunction.
13. If the test result is INCOMPLETE or N/A and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
* If a permanent DTC is output, the system is malfunctioning.
* If no permanent DTC is output, the system is normal.
WIRING DIAGRAM
Refer to DTC P0030 P0030.
INSPECTION PROCEDURE
HINT
* A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
* A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
* Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from transmission.
* Bank 2 refers to the bank that does not include the No. 1 cylinder.
* Sensor 1 refers to the sensor closest to the engine assembly.
* Sensor 2 refers to the sensor farthest away from the engine assembly.
* Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
PROCEDURE
1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P014C, P014D, P015A OR P015B)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result:
HINT
If any DTCs other than DTC P014C, P014D, P015A or P015B are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART SFI System
A -- Continue to next step.
2. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
(a) Inspect the air fuel ratio sensor Air Fuel Ratio Sensor.
NG -- REPLACE AIR FUEL RATIO SENSOR Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) P0030
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
OK -- Continue to next step.
4. CHECK AIR FUEL RATIO SENSOR
(a) Check that the proper air fuel ratio sensor is installed to the vehicle.
NG -- SECURELY REINSTALL AIR FUEL RATIO SENSOR Installation
OK -- Continue to next step.
5. PERFORM CONFIRMATION DRIVING PATTERN
(a) Drive the vehicle according to the Confirmation Driving Pattern.
NEXT -- Continue to next step.
6. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P015A OR P015B)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(e) Read the DTCs.
Result:
B -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
A -- Continue to next step.
7. REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor Removal.
NEXT -- Continue to next step.
8. PERFORM CONFIRMATION DRIVING PATTERN
(a) Drive the vehicle according to the Confirmation Driving Pattern.
NEXT -- Continue to next step.
9. CHECK WHETHER DTC OUTPUT RECURS (DTC P014C, P014D, P014E, P014F, P015A, P015B, P015C OR P015D)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
(e) Read the DTCs.
Result:
B -- CHECK ENGINE TO DETERMINE CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO P0171
A -- END