Part 2
2GR-FSE ENGINE CONTROL: SFI SYSTEM: P0171,P0172,P0174,P0175,P1170,P117B: System Too Lean (Bank 1)
DTC P0171 - System Too Lean (Bank 1)
DTC P0172 - System Too Rich (Bank 1)
DTC P0174 - System Too Lean (Bank 2)
DTC P0175 - System Too Rich (Bank 2)
DTC P1170 - Port Injector Fuel Performance
DTC P117B - Direct Injector Fuel Performance
PART 2
PROCEDURE
1. CHECK ANY OTHER DTCs OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174 AND/OR P0175)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(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, P0174, P0175, P1170 or P117B are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART SFI System
A -- Continue to next step.
2. PERFORM SYSTEM CHECK (CONTROL THE INJECTION WAY)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port.
(f) Read the value Short #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%
(g) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
(h) Read the value 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:
Ventilation hose is connected correctly and is not damaged.
NG -- REPAIR OR REPLACE PCV HOSE
OK -- Continue to next step.
5. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leakage.
OK:
No leakage from intake system.
NG -- REPAIR OR REPLACE INTAKE SYSTEM Intake System
OK -- Continue to next step.
6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(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.
(f) Perform the Control the Injection Volume 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 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.
HINT
- Change the fuel injection volume with in the range of -12.0% to 12%. The injection volume can be changed in fine gradations.
- 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.
Result:
Lean: During the Control the Injection Volume Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently below 0.4 V.
Rich: During the Control the Injection Volume Active Test, the AFS Voltage is consistently below 3.1 V, and the O2S is consistently higher than 0.55 V.
Lean/Rich: During the Control the Injection Volume Active Test, the output voltage of the heated oxygen sensor alternates correctly.
HINT
Refer to "Data List / Active Test" [AFS Voltage B1S1, AFS Voltage B2S1, O2S B1S2 and O2S B2S2] Data List / Active Test.
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).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp.
(e) Read the Coolant Temp 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 100°C (167 and 212°F)
NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.
8. READ VALUE USING TECHSTREAM (MAF)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Start the engine.
(e) Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
(f) Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
(g) Read MAF with the engine speed at 3000 rpm.
Standard:
Between 13.0 gm/sec and 14.0 gm/sec (shift lever: N, A/C: Off).
NG -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.
9. CHECK FUEL PRESSURE (LOW PRESSURE)
(a) Check the fuel pressure Fuel System.
NG -- CHECK FUEL PUMP OPERATION
OK -- Continue to next step.
10. 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.
11. CHECK FOR SPARKS AND IGNITION P0300
NG -- REPAIR OR REPLACE IGNITION SYSTEM
OK -- PERFORM CONFIRMATION DRIVING PATTERN
12. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) P0031
NG -- REPLACE AIR FUEL RATIO SENSOR Removal
OK -- Continue to next step.
13. CHECK TERMINAL VOLTAGE (+B OF A/F SENSOR) P0031
NG -- INSPECT INTEGRATION NO. 1 RELAY (A/F RELAY)
OK -- Continue to next step.
14. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) P0031
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
15. REPLACE AIR FUEL RATIO SENSOR
(a) Replace the air fuel ratio sensor Removal.
NEXT -- Continue to next step.
16. 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 the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG) and turn the Techstream on.
(f) Start the engine and warm it up.
(g) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
NEXT -- Continue to next step.
17. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 AND/OR P117B)
(a) Enter the following menus: Powertrain / Engine / Trouble Codes.
(b) Read the pending DTCs.
Result:
B -- END
A -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR
(a) Check the connection and terminal contact pressure of connectors and wire harness between the mass air flow meter sub-assembly and ECM Electronic Circuit Inspection Procedure.
HINT
Repair any problems.
NEXT -- Continue to next step.
19. 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 the DTCs Reading and Clearing Diagnostic Trouble Codes.
(d) Turn the engine switch off.
(e) Turn the engine switch on (IG) and turn the Techstream on.
(f) Start the engine and warm it up.
(g) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
NEXT -- Continue to next step.
20. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 AND/OR P117B)
(a) Enter the following menus: Powertrain / Engine / Trouble Codes.
(b) Read the pending DTCs.
Result:
B -- END
A -- Continue to next step.