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Home >> Scion >> 2013 >> FR-S F4-2.0L (FA20) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P117B >> Part 2

Part 2






FA20 ENGINE CONTROL: SFI SYSTEM: P0171, P0172, P1170, P117B; System Too Lean (Bank 1); 2013 MY FR-S [03/2012 -]
P0171 - System Too Lean (Bank 1)
P0172 - System Too Rich (Bank 1)
P1170 - Port Injector Fuel Performance
P117B - Direct Injector Fuel Performance
(Continued)

INSPECTION PROCEDURE

HINT
Malfunctioning areas can be identified by performing the Control the Injection Volume for A/F Sensor function provided in the Active Test. The Control the Injection Volume for A/F Sensor function can help to determine whether the air fuel ratio sensor, heated oxygen sensor and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the Control the Injection Volume for A/F Sensor operation using the Techstream.

(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Turn the Techstream on.
(d) Warm up the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Gas AF Control / AFS Voltage B1S1 and O2S B1S2.
(f) Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
(g) Monitor the output voltages of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT
* Change the fuel injection volume within the range of -12% to +12%.
* Each sensor reacts in accordance with increases and decreases in the fuel injection volume.





NOTICE:
The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.





* Following the Control the Injection Volume for A/F Sensor procedure enables technicians to check and graph the voltage outputs of both the air fuel ratio and heated oxygen sensors.

* To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Gas AF Control / AFS Voltage B1S1 and O2S B1S2; and then press the graph button on the Data List view.

HINT
* 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.
* 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.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P1170 AND/OR P117B)

(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 P0171, P0172, P1170 or P117B are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn Techstream on.

(d) Warm up the engine and run the engine at an engine speed of 2500 rpm for approximately 90 seconds.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / AFS Voltage B1S1 and O2S B1S2.

(f) Perform the Control the Injection Volume for A/F Sensor operation with the engine in an idling.

(g) Monitor the output voltages of the A/F and HO2 sensors (AFS Voltage B1S1 and O2S B1S2) displayed on the Techstream.

HINT
* Change the fuel injection volume within the range of -12% to 12%.
* The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
* If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.





Result:





Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 2.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V.

Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently below 2.0 V, and the O2S is consistently higher than 0.55 V.

Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output voltage of the heated oxygen sensor alternates correctly.

HINT
Refer to "Data List / Active Test" [AFS Voltage B1S1 and O2S B1S2] Data List / Active Test.

B -- INSPECT AIR FUEL RATIO SENSOR
A -- Continue to next step.

3. CHECK FREEZE FRAME DATA

(a) Check freeze frame data, and understand the status of vehicles when abnormalities occur.

HINT
* The 5 separate sets of freeze frame data can be used to check the engine status before and after storing of the DTC.
* Use freeze frame data to check if the engine was idling or running.

FREEZE FRAME DATA





NEXT -- Continue to next step.

4. CHECK VEHICLE CONDITION

HINT
When checking trouble during abnormal status, use the following procedure.

(a) Remove the EFI (+B) fuse, wait 60 seconds or more, and connect the fuse.

HINT
* Clear the ECM feedback learning value.
* After clearing the DTC, initial diagnosis of the electronically controlled throttle is performed. Accordingly, engine start after clearing DTC takes place 10 seconds or more after turning the ignition switch ON.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn Techstream on.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.

(f) Increase or decrease injection quantities by 1 step.

HINT
This operation stops feedback compensation and feedback learning, enabling checking of trouble.

(g) Start the engine.

(h) Refer to the running state freeze frame data, reproduce the conditions in which the abnormality occurred, and check the trouble.

Result:





B -- READ VALUE USING TECHSTREAM (SHORT FT #1 AND LONG FT #1)
A -- Continue to next step.

5. CHECK VEHICLE CONDITION

(a) Specify the location of the trouble from the following, then conduct inspections and replacements.

NOTICE:
If only the check light is lit, and it is not possible to specify the location of the trouble, then go to step 3.





(b) After the trouble area is repaired, Check that the trouble symptom is resolved.

Result





B -- READ VALUE USING TECHSTREAM (SHORT FT #1 AND LONG FT #1)
A -- Continue to next step.

6. CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

7. READ VALUE USING TECHSTREAM (SHORT FT #1 AND LONG FT #1)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Start the engine.

(e) Enter the following menus: Powertrain / Engine / Data List / Short #1, Long FT #1.

(f) Read the value Short #1 and Long FT #1.

Result:





HINT
If the trouble occurs during high speed driving, it is possible to take measurements at medium or low speeds by matching the intake air volume to that at the time of the trouble by shifting down.

NG -- READ VALUE USING TECHSTREAM (SHORT FT #1 AND LONG FT #1)
OK -- Continue to next step.

8. CHECK VEHICLE CONDITION

(a) Check the diagnostic table and freeze frame data again, and if there is no abnormality, finish operations.

HINT
* In the event of running out of gas, the fuel compensation quantity will increase by +35% or more, and if this continues for 2 trips, this is a lean abnormality, and P0171 may be stored.
* Repeated short trips (a short time between the ignition switch ON and turning it off or short distance driving) result in gasoline vaporizing at subsequent engine warm-up, and P0172 as a result of increased blow-by gas may be stored.

NEXT -- END

9. READ VALUE USING TECHSTREAM (SHORT FT #1 AND LONG FT #1)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port.

(e) Read the value Short FT #1 and Long FT #1.

Standard:





(f) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

(g) Read the value Short FT #1 and Long FT #1.

Standard:





Result:





B -- READ VALUE USING TECHSTREAM (FUEL PRESS)

C -- INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

D -- CHECK EMISSION CONTROL SYSTEM
A -- Continue to next step.

10. CHECK VEHICLE CONDITION

(a) Check the diagnostic table and freeze frame data again, and if there is no abnormality, finish operations.

HINT
* In the event of running out of gas, the fuel compensation quantity will increase by +35% or more, and if this continues for 2 trips, this is a lean abnormality, and P0171 may be stored.
* Repeated short trips (a short time between turning the ignition switch ON and turning it off or short distance driving) result in gasoline vaporizing at subsequent engine warm-up, and P0172 as a result of increased blow-by gas may be stored.

NEXT -- END
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