2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM
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- Barbra Fox
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1 385 P2237 / Open (Bank 1 Sensor 1) P2238 Low (Bank 1 Sensor 1) P2239 High (Bank 1 Sensor 1) P2240 P2241 / Open (Bank 2 Sensor 1) Low (Bank 2 Sensor 1) P2242 High (Bank 2 Sensor 1) P2252 Low (Bank 1 Sensor 1) P2253 High (Bank 1 Sensor 1) P2255 Low (Bank 2 Sensor 1) P2256 High (Bank 2 Sensor 1) DCRIPTION Although the titles refer to the "oxygen sensor", these s relate to the Air Fuel Ratio (A/F) sensor. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and is located near the engine assembly. Refer to P2195 (See page -364). No. Detection Condition Trouble Area P2237 P2238 Open in the between terminals AF+ and AF- of the A/F sensor while engine is running
2 386 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM No. Detection Condition Trouble Area P2238 P2241 P2239 P2242 P2252 P2255 P2253 P2256 Case 1: Condition (a) or (b) continues for 5.0 seconds or more (1 trip detection logic): (a) AF+ voltage 0.5 V or less (b) (AF+) - (AF-) = 0.1 V or less Case 2: A/F sensor admittance: Less than /Ω AF+ voltage more than 4.5 V for 5.0 seconds or more AF- voltage 0.5 V or less for 5.0 seconds or more AF- voltage more than 4.5 V for 5.0 seconds or more Open or short in Air Fuel Ratio (A/F) sensor (bank 1, 2 sensor 1) Air Fuel Ratio (A/F) sensor (bank 1, 2 sensor 1) Air Fuel Ratio (A/F) sensor heater (bank 1, 2 sensor 1) A/F sensor heater and relay s A/F sensor heater (bank 1, 2 sensor 1) A/F sensor heater and relay s A/F sensor heater (bank 1, 2 sensor 1) A/F sensor heater and relay s A/F sensor heater (bank 1, 2 sensor 1) A/F sensor heater and relay s s P2238, P2239, P2252 and P2253 indicate malfunctions related to bank 1 A/F sensor. s P2241, P2242, P2255 and P2256 indicate malfunctions related to bank 2 A/F sensor. Bank 1 refers to the bank that includes No. 1 cylinder. Bank 2 refers to the bank that includes No. 2 cylinder. MONITOR DCRIPTION These s are output when there is an open or short in the A/F sensor, or if A/F sensor output drops. To detect these problems, the voltage of the A/F sensor is monitored when turning the ignition switch to the ON position, and the admittance (admittance is an electrical term that indicates the ease of flow of current) is checked while driving. If the voltage of the A/F sensor is between 0.6 V and 4.5 V, it is considered normal. If the voltage is outside of the specified range, or the admittance is less than the standard value, the ECM will determine that there is a malfunction in the A/F sensor. If the same malfunction is detected in the next driving cycle, the MIL is illuminated and a is set.. MONITOR STRATEGY Related s P2237: A/F sensor (Bank 1) open between AF+ and AF- P2238: A/F sensor (Bank 1) low impedance P2238: A/F sensor (Bank 1) short between AF+ and AF- P2238: A/F sensor (Bank 1) short between AF+ and GND P2239: A/F sensor (Bank 1) short between AF+ and +B P2240: A/F sensor (Bank 2) open between AF+ and AF- P2241: A/F sensor (Bank 2) low impedance P2241: A/F sensor (Bank 2) short between AF+ and AF- P2241: A/F sensor (Bank 2) short between AF+ and GND P2242: A/F sensor (Bank 2) short between AF+ and +B P2252: A/F sensor (Bank 1) short between AF- and GND P2253: A/F sensor (Bank 1) short between AF- and +B P2255: A/F sensor (Bank 2) short between AF- and GND P2256: A/F sensor (Bank 2) short between AF- and +B
3 387 Required Sensors/Components (Main) A/F sensor Required Sensors/Components (Related) - Frequency of Operation Continuous Duration 10 seconds MIL Operation 2 driving cycles Sequence of Operation None TYPICAL ENABLING CONDITIONS Monitor runs whenever following s not present A/F sensor - Open between AF+ and AF- Battery voltage Engine Estimated sensor temperature A/F sensor - Low impedance Engine coolant temperature Estimated sensor temperature Fuel cut Others: Battery voltage Ignition switch Time after ignition switch is OFF to ON P0031, P0032, P0051, P0052: A/F sensor heater P P0103: MAF sensor P P0113: IAT sensor P P0118, P0125: ECT sensor P P0223, P2135: TP sensor P0125: Insufficient ECT for Closed Loop P0171, P0172: Fuel trim P P0308: Misfire P0335: CKP sensor P0455, P0456: EVAP system P0500: VSS P2440: AIR control valve stuck open P2441: AIR control valve stuck close P2444: AIP stuck On P2445: AIP stuck Off 13.5 V or more Running 450 to 550 C (842 to 1022 F) for P2237 and P C (0 F) or higher [Closed loop enabling ECT] 700 to 800 C (1292 to 1472 F) for P2238 and P2241 Not executed 11 V or more ON 5 seconds or more TYPICAL MALFUNCTION THRHOLDS P2237 and P2240: A/F sensor admittance Below /Ω P2238 and P2241: When one of the following conditions is met: Condition 1, 2 or 3 1. Sensor admittance Less then /Ω 2. AF+ voltage 0.5 V or less 3. Difference of AF+ and AF- Less than 0.1 V P2239 and P2242: AF+ terminal voltage P2252 and P2255: AF- terminal voltage P2253 and P2256: AF- terminal voltage More than 4.5 V 0.5 V or less More than 4.5 V
4 388 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM COMPONENT OPERATING RANGE Sensor admittance AF+ voltage AF- voltage Difference of AF+ and AF /Ω or more 0.6 to 4.5 V 0.6 to 4.5 V 0.11 to 0.8 V WIRING DIAGRAM Refer to P2195 (See page -368). INSPECTION PROCEDURE Intelligent tester only: Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TT. The A/F CONTROL function can help to determine whether the Air Fuel Ratio (A/F) sensor, Heated Oxygen (HO2) sensor and other potential trouble areas are malfunctioning. The following instructions describe how to conduct the A/F CONTROL operation using the intelligent tester. 1. Connect the intelligent tester to the DLC3 with CAN VIM. 2. Start the engine and turn the tester ON. 3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds. 4. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TT / A/F CONTROL. 5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). 6. Monitor the output voltages of the A/F and HO2 sensors (AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2) displayed on the tester. The A/F CONTROL 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. Standard voltage Tester Display (Sensor) AFS B1S1 or AFS B2S1 (A/F) AFS B1S1 or AFS B2S1 (A/F) O2S B1S2 or O2S B2S2 (HO2) O2S B1S2 or O2S B2S2 (HO2) Status Voltage Rich Less than 3.0 Lean More than 3.35 Rich More than 0.55 Lean Less than 0.4 NOTICE: The Air Fuel Ratio (A/F) sensor has an output delay of a few seconds and the Heated Oxygen (HO2) sensor has a maximum output delay of approximately 20 seconds.
5 389 Case A/F Sensor (Sensor 1) HO2 Sensor (Sensor 2) Main Suspected Trouble Areas 1 More than 3.35 V Less than 3.0 V More than 0.55 V Less than 0.4 V More than 3.35 V Less than 3.0 V More than 0.55 V Less than 0.4 V A/F sensor A/F sensor heater A/F sensor HO2 sensor HO2 sensor heater HO2 sensor 4 Injection volume Fuel injector Fuel pressure Gas leakage from exhaust system (Air fuel ratio extremely lean or rich) Following the A/F CONTROL procedure enables technicians to check and graph the output voltages of both the A/F and HO2 sensors. To display the graph, enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TT / A/F CONTROL / USER DATA / AFS B1S1 and O2S B1S2 or AFS B2S1 and O2S B2S2. Then press the Y button and ENTER button, followed by the F4 button. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, 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.
6 390 2UZ-FE ENGINE CONTROL SYSTEM SFI SYSTEM 1 CHECK HARNS AND CONNECTOR (A/F SENSOR - ECM) (a) (b) (c) Disconnect the A12 or A13 A/F sensor connector. Disconnect the E5 ECM connector. Check the resistance. Standard resistance (Check for open) Tester Connections AF+ (A12-3) - A1A+ (E5-22) AF+ (A13-3) - A2A+ (E5-23) AF- (A12-4) - A1A- (E5-30) AF- (A13-4) - A2A- (E5-31) Standard resistance (Check for short) Tester Connections AF+ (A12-3) or A1A+ (E5-22) - Body AF+ (A13-3) or A2A+ (E5-23) - Body AF- (A12-4) or A1A- (E5-30) - Body AF- (A13-4) or A2A- (E5-31) - Body Specified Conditions Below 1 Ω Below 1 Ω Specified Conditions 10 kω or higher 10 kω or higher HA1A HA2A Wire Harness Side A/F Sensor Connector A12 A13 HT +B AF+ AF- ECM Connector E5 A2A+ A2A- A1A+ A1A- A121613E02 Reference (Bank 1 Sensor 1 System Diagram) From Battery A/F Heater Fuse A/F HEATER A/F Sensor Heater +B HT HA1A Sensor AF- AF+ A1A+ A1A- ECM Duty Control From EFI Relay A118002E16
7 391 NG REPAIR OR REPLACE HARNS OR CONNECTOR OK 2 REPLACE AIR FUEL RATIO SENSOR NEXT 3 CHECK WHETHER OUTPUT RECURS Result (a) Connect the intelligent tester to the DLC3. (b) Turn the ignition switch to the ON position and turn the tester ON. (c) Clear the s (See page -35) (d) Start the engine. (e) Allow the engine to idle for 5 minutes or more. (f) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / INFO / PENDING COD. (g) Read pending s. Display ( Output) No output P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256 Proceed to A B B REPLACE ECM A END
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Last Modified: 4-26-2007 Service Category: Drivetrain 1.6 C Section: Automatic Transmission/Transaxle Model Year: 2007 Model: 4Runner Doc ID: RM000000XP101WX Title: A750E AUTOMATIC TRANSMISSION: AUTOMATIC
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196 1GR-FE EINE CONTROL SYSTEM SFI SYSTEM P0340 P0342 P0343 Camshaft Position Sensor "A" Circuit (Bank 1 or Single Sensor) Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor) Camshaft
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