T P0139, P0159 O2S2 omponent escription The heated oxygen sensor 2, after three way catalyst 1, monitors the oxygen level in the exhaust gas on each bank. ven if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation. PP:2260 BS000VV ONSUT- Reference Value in ata onitor ode Specification data are reference values. ONTOR T ONTON SPTON S327R BS000VW O2S2 (B1) O2S2 (B2) O2S2 NTR (B1) O2S2 NTR (B2) Warm-up condition fter keeping engine speed between 3,500 and 4,000 rpm for one minute and at idle for one minute under no load. On Board iagnosis ogic Revving engine from idle to 3,000 rpm quickly. The heated oxygen sensor 2 has a much longer switching time between rich and lean than the heated oxygen sensor 1. The oxygen storage capacity before the three way catalyst causes the longer switching time. To judge the malfunctions of heated oxygen sensor 2, monitors whether the switching response of the sensor's voltage is faster than specified during the various driving condition such as fuel-cut. 0-0.3V pprox. 0.6-1.0V N R BS000VX S302U T No. Trouble diagnosis name T detecting condition Possible cause P0139 0139 (Bank 1) P0159 0159 (Bank 2) eated oxygen sensor 2 circuit slow response t takes more time for the sensor to respond between rich and lean than the specified time. arness or connectors (The sensor circuit is open or shorted) eated oxygen sensor 2 uel pressure njectors ntake air leaks -249
T onfirmation Procedure T P0139, P0159 O2S2 NOT: f T onfirmation Procedure has been previously conducted, always turn ignition switch O and wait at least 10 seconds before conducting the next test. WT ONSUT- TSTN ONTON: or better results, perform T WOR SUPPORT at a temperature of 0 to 30 (32 to 86 ). 1. Turn ignition switch ON and select T ONTOR mode with ONSUT-. 2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch O and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no load. 5. et engine idle for one minutes. 6. ake sure that OON TP/S indicates more than 70 (158 ). S174Y f not, warm up engine and go to next step when OON TP/S indication reaches to 70 (158 ). 7. Select O2S2 (B1) P0139 or O2S2 (B2) P0159 of O2S2 in T WOR SUPPORT mode with ONSUT-. 8. Start engine and following the instruction of ONSUT-. BS000VY 9. ake sure that O is displayed after touching S- RSUTS. f N is displayed, refer to -255, "iagnostic Procedure". f N NOT B NOS is displayed, perform the following. a. Turn ignition switch O and leave the vehicle in a cool place (soak the vehicle). b. Return to step 1. Overall unction heck PBB0115 Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. uring this check, a T might not be confirmed. WT ST 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch O and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no load. 4. et engine idle for one minutes. 5. Set voltmeter probes between terminal 74 [O2S2 (B1) signal] or 55 [O2S2 (B2) signal] and engine ground. BS000VZ -250
6. heck the voltage when revving up to 4,000 rpm under no load at least 10 times. (epress and release accelerator pedal as soon as possible.) change of voltage should be more than 0.06V for 1 second during this procedure. f the voltage can be confirmed in step 6, step 7 is not necessary. 7. eep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 P) in position (/T), 4th gear position (/T). change of voltage should be more than 0.06V for 1 second during this procedure. 8. f N, go to -255, "iagnostic Procedure". PBB1108-251
Wiring iagram BN 1 BS002ZQ TBWT0205-252
Specification data are reference values and are measured between each terminal and ground. UTON: o not use ground terminals when measuring input/output voltage. oing so may result in damage to the 's transistor. Use a ground other than terminals, such as the ground. TR- N NO. 74 W 78 B WR OOR T ONTON T ( Voltage) eated oxygen sensor 2 (bank 1) Sensors' ground (eated oxygen sensor) [ngine is running] Warm-up condition Revving engine from idle to 3,000 rpm quickly after the following conditions are met. fter keeping the engine speed between 3,500 and 4,000 rpm for one minute and at idle for one minute under no load. [ngine is running] Warm-up condition dle speed 0 - pproximately 1.0V pproximately 0V -253
BN 2 TBWT0206-254
Specification data are reference values and are measured between each terminal and ground. UTON: o not use ground terminals when measuring input/output voltage. oing so may result in damage to the 's transistor. Use a ground other than terminals, such as the ground. TR- N NO. WR OOR 55 B/OR 78 B iagnostic Procedure 1. RTTN ROUN SRWS 1. Turn ignition switch O. 2. oosen and retighten engine ground screws. T ONTON T ( Voltage) eated oxygen sensor 2 (bank 2) Sensors' ground (eated oxygen sensor) [ngine is running] Warm-up condition Revving engine from idle to 3,000 rpm quickly after the following conditions are met. fter keeping the engine speed between 3,500 and 4,000 rpm for one minute and at idle for one minute under no load. [ngine is running] Warm-up condition dle speed 0 - pproximately 1.0V pproximately 0V BS000W1 >> O TO 2. PBB1071-255
2. R T S-RNN T With ONSUT- 1. Start engine and warm it up to normal operating temperature. 2. Select S-RNN ONT in WOR SUPPORT mode with ONSUT-. 3. lear the self-learning control coefficient by touching R. 4. Run engine for at least 10 minutes at idle speed. s the 1st trip T P0171, P0172, P0174 or P0175 detected? s it difficult to start engine? S968Y Without ONSUT- 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch O. 3. isconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed. 4. Stop engine and reconnect mass air flow sensor harness connector. 5. ake sure T P0102 is displayed. 6. rase the T memory. Refer to -69, "OW TO RS SSON-RT NOST NORTON". 7. ake sure T P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed. s the 1st trip T P0171, P0172, P0174 or P0175 detected? s it difficult to start engine? PBB1077 Yes or No Yes >> Perform trouble diagnosis for T P0171, P0174 or P0172, P0175. Refer to -260 or -269. No >> O TO 3. 3. O2S2 ROUN RUT OR OPN N SORT 1. Turn ignition switch O. 2. isconnect heated oxygen sensor 2 harness connector. 3. heck harness continuity between O2S2 terminal 4 and engine ground. Refer to Wiring iagram. ontinuity should exist. 4. lso check harness for short to ground and short to power. O or N O >> O TO 5. N >> O TO 4. PBB1076 4. TT UNTONN PRT heck the following. oint connector-3 arness for open or short between O2S2 and engine ground >> Repair open circuit or short to ground or short to power in harness or connectors. -256
5. O2S2 NPUT SN RUT OR OPN N SORT 1. isconnect harness connector. 2. heck harness continuity between terminal and O2S2 terminal as follows. Refer to Wiring iagram. Terminals T Sensor Bank P0139 74 1 1 P0159 55 1 2 ontinuity should exist. 3. heck harness continuity between the following terminals and ground. Refer to Wiring iagram. Terminals T Sensor Bank P0139 74 1 1 P0159 55 1 2 ontinuity should not exist. 4. lso check harness for short to ground and short to power. O or N O >> O TO 7. N >> O TO 6. 6. TT UNTONN PRT heck the following. oint connector-3 arness for open or short between O2S2 and >> Repair open circuit or short to ground or short to power in harness or connectors. 7. T OXYN SNSOR 2 Refer to -258, "omponent nspection". O or N O >> O TO 8. N >> Replace malfunctioning heated oxygen sensor 2. 8. NTRTTNT NNT Refer to -137, "TROUB NOSS OR NTRTTNT NNT". >> NSPTON N -257
omponent nspection T OXYN SNSOR 2 With ONSUT- 1. Turn ignition switch ON and select T ONTOR mode with ONSUT-. 2. Start engine and warm it up to the normal operating temperature. 3. Turn ignition switch O and wait at least 10 seconds. 4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no load. 5. et engine idle for one minutes. BS0031 S174Y 6. Select U NTON in TV TST mode, and select O2S2 (B1)/(B2) as the monitor item with ONSUT-. S662Y 7. heck O2S2 (B1)/(B2) at idle speed when adjusting U NTON to ±25%. PBB0796 O2S2 (B1)/(B2) should be above 0.63V at least once when the U NTON is +25%. O2S2 (B1)/(B2) should be below 0.48V at least once when the U NTON is 25%. UTON: iscard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread leaner tool -43897-18 or -43897-12 and approved anti-seize lubricant. Without ONSUT- 1. Start engine and warm it up to the normal operating temperature. 2. Turn ignition switch O and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least one minute under no load. 4. et engine idle for one minutes. 5. Set voltmeter probes between terminal 74 [O2S2 (B1) signal] or 55 [O2S2 (B2) signal] and engine ground. -258
6. heck the voltage when revving up to 4,000 rpm under no load at least 10 times. (epress and release accelerator pedal as soon as possible.) The voltage should be above 0.63V at least once during this procedure. f the voltage is above 0.63V at step 6, step 7 is not necessary. 7. eep vehicle at idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 P) in position (/T), 4th gear position (/T). The voltage should be below 0.48V at least once during this PBB1108 procedure. 8. f N, replace heated oxygen sensor 2. UTON: iscard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread leaner tool -43897-18 or -43897-12 and approved anti-seize lubricant. Removal and nstallation T OXYN SNSOR 2 Refer to -23, "XUST NO N TR WY TYST". BS000W3-259