Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1GR-FE ENGINE CONTROL
CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)
PERFORM CONFIRMATION DRIVING PATTERN
CHECK WHETHER DTC OUTPUT RECURS
DTC P2237 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1)
DTC P2238 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1)
DTC P2239 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1)
DTC P2240 Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 2 Sensor 1)
DTC P2241 Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 2 Sensor 1)
DTC P2242 Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 2 Sensor 1)
DTC P2252 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1)
DTC P2253 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1)
DTC P2255 Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 2 Sensor 1)
DTC P2256 Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 2 Sensor 1)
DESCRIPTION
Refer to DTC P2195 ().
| DTC No. | DTC Detection Condition | Trouble Area |
| P2237 P2240 | Open in the circuit between terminals AF+ and AF- of the air fuel ratio sensor while the engine is running (2 trip detection logic). | Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM |
| P2238 P2241 | Case 1: (a) AF+ voltage is 0.5 V or less. (b) (AF+) - (AF-) is 0.1 V or less. Case 2: | Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM |
| P2239 P2242 | AF+ voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). | Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM |
| P2252 P2255 | AF- voltage is 0.5 V or less for 5.0 seconds or more (2 trip detection logic). | Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM |
| P2253 P2256 | AF- voltage is higher than 4.5 V for 5.0 seconds or more (2 trip detection logic). | Open or short in air fuel ratio sensor (sensor 1) circuit Air fuel ratio sensor (sensor 1) ECM |
- HINT:
DTCs P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
DTCs P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
Bank 1 refers to the bank that includes cylinder No. 1.
Bank 2 refers to the bank that includes cylinder No. 2.
MONITOR DESCRIPTION
The air fuel ratio sensor varies its output voltage in proportion to the air-fuel ratio. If the air fuel ratio sensor impedance (alternating current resistance) or output voltage deviates greatly from the standard range, the ECM determines that there is an open or short in the air fuel ratio sensor circuit.
CONFIRMATION DRIVING PATTERN
Start the engine and wait for 5 minutes or more.
WIRING DIAGRAM
Refer to DTC P2195 ().
INSPECTION PROCEDURE
- HINT:
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transmission.
*: The No. 1 cylinder is the cylinder which is farthest from the 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.
| 1.CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM) |
Disconnect the air fuel ratio sensor connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD Tester Connection Condition Specified Condition C22-1 (HA1A) - C45-22 (HA1A) Always Below 1 Ω C22-3 (A1A+) - C45-126 (A1A+) Always Below 1 Ω C22-4 (A1A-) - C45-125 (A1A-) Always Below 1 Ω C23-1 (HA2A) - C45-20 (HA2A) Always Below 1 Ω C23-3 (A2A+) - C45-103 (A2A+) Always Below 1 Ω C23-4 (A2A-) - C45-102 (A2A-) Always Below 1 Ω C22-1 (HA1A) or C45-22 (HA1A) - Body ground Always 10 kΩ or higher C22-3 (A1A+) or C45-126 (A1A+) - Body ground Always 10 kΩ or higher C22-4 (A1A-) or C45-125 (A1A-) - Body ground Always 10 kΩ or higher C23-1 (HA2A) or C45-20 (HA2A) - Body ground Always 10 kΩ or higher C23-3 (A2A+) or C45-103 (A2A+) - Body ground Always 10 kΩ or higher C23-4 (A2A-) or C45-102 (A2A-) - Body ground Always 10 kΩ or higher for RHD Tester Connection Condition Specified Condition C22-1 (HA1A) - C46-22 (HA1A) Always Below 1 Ω C22-3 (A1A+) - C46-126 (A1A+) Always Below 1 Ω C22-4 (A1A-) - C46-125 (A1A-) Always Below 1 Ω C23-1 (HA2A) - C46-20 (HA2A) Always Below 1 Ω C23-3 (A2A+) - C46-103 (A2A+) Always Below 1 Ω C23-4 (A2A-) - C46-102 (A2A-) Always Below 1 Ω C22-1 (HA1A) or C46-22 (HA1A) - Body ground Always 10 kΩ or higher C22-3 (A1A+) or C46-126 (A1A+) - Body ground Always 10 kΩ or higher C22-4 (A1A-) or C46-125 (A1A-) - Body ground Always 10 kΩ or higher C23-1 (HA2A) or C46-20 (HA2A) - Body ground Always 10 kΩ or higher C23-3 (A2A+) or C46-103 (A2A+) - Body ground Always 10 kΩ or higher C23-4 (A2A-) or C46-102 (A2A-) - Body ground Always 10 kΩ or higher
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| OK | |
| 2.REPLACE AIR FUEL RATIO SENSOR |
Replace the air fuel ratio sensor ().
| NEXT | |
| 3.PERFORM CONFIRMATION DRIVING PATTERN |
Drive the vehicle according to Confirmation Driving Pattern.
| NEXT | |
| 4.CHECK WHETHER DTC OUTPUT RECURS |
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
Read the pending DTCs.
| Result | Proceed to |
| No DTC is output | A |
| P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255 or P2256 is output | B |
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| A | ||
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