P1170
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,P0174,P0175,P1170,P117B: System Too Lean (Bank 1)
P117B - Direct Injector Fuel Performance
DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the short-term and the long-term fuel trim.
The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if it is lean.
Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the ideal theoretical value. The long-term fuel trim controls overall fuel compensation. The long-term fuel trim compensates for long term deviations of the fuel trim from the ideal theoretical value. These long term deviations result from the corrections made by the short-term fuel trim.
If both the short-term fuel and long-term fuel trim are lean or rich beyond predetermined values, it is interpreted as a malfunction, the ECM illuminates the MIL and sets a DTC.
HINT
- When DTC P0171 or P0174 is set, the actual air-fuel ratio is on the lean side. When DTC P0172 or P0175 is set, the actual air-fuel ratio is on the rich side.
- If the vehicle runs out of fuel, the air-fuel ratio is lean and DTC P0171 or P0174 may be set. The MIL is then illuminated.
- When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is more than 75°C [167°F]), the system is functioning normally.
- When DTC P1170 or P117B is output , it may not be possible to precisely determine whether the port injection or the direct injection is malfunctioning, depending on the conditions. In this case, perform an Active Test (control the injection way) to determine which injection system is malfunctioning.
MONITOR DESCRIPTION
Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel injection volumes also affect the average fuel trim learning value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learning value of the air fuel ratio). If the average fuel trim learning value exceeds the malfunction threshold, the ECM interprets this as a malfunction in the fuel system and sets a DTC.
- Example:
- If the average fuel trim learning value is 35% or more or -35% or less, the ECM interprets this as a fuel system malfunction.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
Fuel-Trim Lean/Rich (P0171, P0172, P0174, P0175)
Fuel Trim (Port Injection, P1170)
Fuel Trim (Direct Injection, P117B)
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.
4. Turn the engine switch off.
HINT
- Let the engine cool down.
- Touch a radiator hose to check that the coolant temperature has dropped.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or more with all the accessories switched off [B].
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the Pending DTCs [C].
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
9. Drive the vehicle at a speed between 37 mph and 75 mph (60 km/h and 120 km/h) and at an engine speed of between 1400 rpm and 3200 rpm for 5 minutes or more [D].
10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
11. Read the Pending DTCs [E].
HINT
- If a pending DTC is output, the system is malfunctioning.
- If a pending DTC is not output, perform the following procedure.
12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
13. Input the DTC: P0171, P0172, P0174 or P0175, P1170 or P117B.
14. Check the DTC judgment result.
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] through [E] again.
15. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.
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 P2195 P2195.
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 and turn the Techstream on.
(c) Warm up the engine at an engine speed of 2000 rpm for approximately 90 seconds.
(d) On the Techstream, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F sensor.
(e) Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume.)
(f) Monitor the output voltages of the air fuel ratio sensors and heated oxygen sensors (AFS Voltage B1 S1 and O2S B1 S2 or AFS Voltage B2 S1 and O2S B2 S2) displayed on the Techstream.
HINT
- The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- 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 sensors and heated oxygen sensors.
- To display the graph, enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / A/F Control System / AFS Voltage B1 S1 and O2S B1 S2 or AFS Voltage B2 S1 and O2S B2 S2.
HINT
- 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
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Trouble Codes.
(d) Read the DTCs.
Result:
HINT
If any DTCs other than P0171, P0172, P0174, P0175, P1170 or P117B are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART SFI System
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port.
(d) Read the value.
(1) Enter: Data List / A/F Control System / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2.
OK:
Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19%
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
(f) Read the value.
(1) Enter: Data List / A/F Control System / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2.
OK:
Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19%
Result:
D -- CHECK PCV HOSE
C -- CHECK FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)
B -- CHECK FUEL PRESSURE SENSOR
A -- Continue to next step.
3. CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST
(a) Has the vehicle run out of fuel in the past?
NO -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
YES -- DTC CAUSED BY RUNNING OUT OF FUEL
4. CHECK PCV HOSE
OK:
PCV hose is connected correctly and is not damaged.
NG -- REPAIR OR REPLACE PCV HOSE Removal
OK -- Continue to next step.
5. CHECK AIR INDUCTION SYSTEM
(a) Check the air induction system for vacuum leaks.
OK:
No leaks from intake system.
NG -- REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK -- Continue to next step.
6. PERFORM ACTIVE TEST USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Warm up the engine at an engine speed of 2000 rpm for approximately 90 seconds.
(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
(e) Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).
(f) Monitor the output voltages of the air fuel ratio sensors and heated oxygen sensors (AFS Voltage B1 S1 and O2S B1 S2 or AFS Voltage B2 S1 and O2S B2 S2) displayed on the Techstream.
HINT
- The Control the Injection Volume for A/F sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
Result:
Lean:
### ptxt ### During Control the Injection Volume for A/F sensor, the air fuel ratio sensor output voltage (AFS) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V.
Rich:
### ptxt ### During Control the Injection Volume for A/F sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V.
B -- INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
A -- Continue to next step.
7. READ VALUE USING TECHSTREAM (COOLANT TEMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
(d) Read the Data List twice, when the engine is both cold and warmed up.
Standard:
With cold engine
Same as ambient air temperature.
With warm engine
Between 75 and 95°C (167 and 203°F)
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.
8. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY
(a) Inspect the mass air flow meter sub-assembly On-Vehicle Inspection.
NG -- REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Removal
OK -- Continue to next step.
9. CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leaks.
OK:
No gas leaks.
NG -- REPAIR OR REPLACE EXHAUST SYSTEM
OK -- Continue to next step.
10. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
(a) Disconnect the E47*1 or E48*2 A/F sensor connector.
HINT
*1: Bank 1 sensor 1
*2: Bank 2 sensor 1
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Bank 1 sensor 1):
Standard resistance (Bank 2 sensor 1):
Result
C -- REPLACE AIR FUEL RATIO SENSOR Removal
B -- REPLACE AIR FUEL RATIO SENSOR Removal
A -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
(a) Disconnect the E47 and E48 A/F sensor connectors.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Turn the engine switch off.
(e) Disconnect the E3 and E4 ECM connectors.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
12. REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor.
HINT
- for 2WD Removal
- for AWD Removal
NEXT -- Continue to next step.
13. PERFORM CONFIRMATION DRIVING PATTERN
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Clear DTCs DTC Check / Clear.
(d) Turn the engine switch off and wait for 30 seconds.
(e) Turn the engine switch on (IG) and turn the Techstream on.
(f) Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.
NEXT -- Continue to next step.
14. CHECK WHETHER DTC OUTPUT RECURS
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Trouble Codes.
(d) Read the DTCs.
Result:
A -- END
B -- Continue to next step.
15. CHECK FUEL PRESSURE (LOW PRESSURE)
(a) Check the fuel pressure Fuel System.
NG -- CHECK FUEL PUMP OPERATION
OK -- REPLACE ECM Removal
16. CHECK FUEL PUMP OPERATION
(a) Check the fuel pump operation Fuel System.
NG -- REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT Fuel Pump Control Circuit
OK -- Continue to next step.
17. CHECK FUEL LEAK (LOW PRESSURE SIDE)
(a) Check for fuel leaks (low pressure side).
OK:
No leaks.
NG -- REPAIR OR REPLACE FUEL SYSTEM
OK -- Continue to next step.
18. CHECK FUEL LINE
(a) Check the fuel line for leaks or blockage Fuel System.
OK:
No leaks or blockage.
NG -- REPAIR OR REPLACE FUEL LINE Fuel System
OK -- CHECK AND REPLACE FUEL SYSTEM (FUEL PRESSURE REGULATOR, FUEL FILTER)
19. CHECK FUEL PRESSURE SENSOR
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) While revving the engine, check that the fuel pressure fluctuates.
Standard:
Idling
3000 to 5000 kPa
2000 rpm (No load)
7000 to 9000 kPa
HINT
The A/C switch and all accessory switches should be off, and the shift lever should be in N or P, and the engine should be fully warmed up.
NG -- CHECK MISFIRE COUNT
OK -- Continue to next step.
20. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection way / Direct.
HINT
The A/C switch and all accessory switches should be off, and the shift lever should be in N or P, and the engine should be fully warmed up.
(d) Read the value.
(1) Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).
Result:
C -- REPLACE ECM Removal
B -- INSPECT FUEL RELIEF VALVE ASSEMBLY
A -- REPLACE FUEL PRESSURE SENSOR Removal
D -- Continue to next step.
21. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Start the engine and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection way / Direct.
HINT
The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.
(d) Read the value of Data List:
(1) Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).
Result:
D -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
C -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 2)) Removal
B -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (BANK 1)) Removal
A -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Removal
22. CHECK MISFIRE COUNT
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
(e) Allow the engine to idle.
(f) Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.
If no misfire counts occur for any of the cylinders, perform the following procedure:
(1) Move the shift lever to D.
(2) Monitor all of the misfire rate values that are displayed on the Techstream.
Result:
B -- REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION) Removal
A -- Continue to next step.
23. INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2)
(a) Turn the engine switch off.
(b) Replace the No. 1 and No. 2 injector drivers with known good ones from another vehicle.
NOTICE:
Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.
(c) Connect the Techstream to the DLC3.
(d) Start the engine.
(e) Clear DTCs DTC Check / Clear.
(f) Perform the driving test.
(g) Enter the following menus: Powertrain / Engine / Trouble Codes.
(h) Read the DTCs.
Result
B -- REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2) Removal
A -- Continue to next step.
24. INSPECT FUEL RELIEF VALVE ASSEMBLY
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG) and turn the Techstream on.
(c) Start the engine.
(d) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(e) Record the Fuel Press value.
(f) Turn the engine switch off.
(g) Wait for 10 seconds.
(h) Turn the engine switch on (IG) and turn the Techstream on.
(i) Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
(j) Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream.
Result:
A -- REPLACE FUEL RELIEF VALVE ASSEMBLY Removal
B -- REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE) Removal
25. CHECK FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)
(a) Check the injection volume (whether fuel volume is high or low, and whether injection pattern is poor) Fuel Injector (For Port Injection).
NG -- REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Removal
OK -- REPLACE ECM Removal