Engine Controls (2ZZ-GE) - Diagnostics: Other Toyota Celica T230 рестайлинг

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

Scheme 644

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

MONITOR RESULT

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

1. TID (Test Identification) is assigned to each emission-related component.
2. TLT (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
3. CID (Component Identification) is assigned to each test value.
4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $04: HO2S Heater

TID $04 HO2S HEATER MONITOR RESULT

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

Scheme 645

COMPONENT OPERATING RANGE

Scheme 646

TYPICAL ENABLING CONDITIONS

Scheme 647

COMPONENT OPERATING RANGE

Scheme 648

TYPICAL ENABLING CONDITIONS

Scheme 649

COMPONENT OPERATING RANGE

Scheme 650

COMPONENT OPERATING RANGE

Reference (Normal condition)

NORMAL CONDITION REFERENCE

FAIL SAFE

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly. If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 651

TYPICAL ENABLING CONDITIONS

Scheme 652

COMPONENT OPERATING RANGE

Scheme 653

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 654

Scheme 655

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

1. TID (Test Identification) is assigned to each emission-related component.
2. TLT (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
3. CID (Component Identification) is assigned to each test value.
4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $08: Thermostat

TID $08 THERMOSTAT RESULT

COMPONENT OPERATING RANGE

Front HO2S voltage monitor

If the HO2S voltage is out of the standard value, the ECM interprets this as a malfunction.

FRONT HO2S VOLTAGE MONITOR

Scheme 656

Scheme 657

1. Connect the hand-held tester to the DLC3.
2. Switch the hand-held tester from the normal mode to the check mode (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ).
3. Start the engine and let the engine idle for 120 seconds or more.
4. Drive the vehicle at 25 mph (40 km/h) or more for 40 seconds or more.
5. Let the engine idle for 20 seconds or more. Perform steps (d) and (e) at least 3 times.
6. Let the engine idle for 30 seconds.

HINT

If a malfunction exists, the MIL will be illuminated on the multi information display during step (f).

Note. If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you do not have the hand-held tester, turn the ignition switch OFF after performing steps from (c) to (f), then perform steps from (c) to (f) again.

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

Front HO2S frequency monitor (cruse)

If the $90 is out of the standard value, the ECM interprets this as a malfunction.

Scheme 658

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

COMPONENT OPERATING RANGE

Rear HO2S voltage monitor

If the HO2S sensor voltage is out of the standard value, the ECM interprets this as a malfunction.

O2S TEST RESULT

If the time required to change is out of the standard value, the ECM interprets this as a malfunction.

O2S TEST RESULT

Rear HO2S slow response monitor

If the elapsed time is out of the standard value, the ECM interprets this as a malfunction.

O2S TEST RESULT (REAR HO2S SLOW RESPONSE MONITOR)

Rear HO2S element monitor

If all the values ($81, $84, $85 and $87) are out of the standard values, the ECM interprets this as a malfunction.

O2S TEST RESULT (REAR HO2S ELEMENT MONITOR)

TYPICAL MALFUNCTION THRESHOLDS

CONFIRMATION DRIVING PATTERN

1. Connect the hand-held tester to the DLC3.
2. Record DTCs and the freeze frame data.
3. Set the check mode using the hand-held tester (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ).
4. Read the value on the misfire counter for each cylinder when idling. If the value is displayed on the misfire counter, skip the following procedure of the confirmation driving.
5. Drive the vehicle several times with the engine speed, load and surrounding range shown as ENGINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the DATA LIST. If you have no hand-held tester, turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. HINT: Do not turn the ignition switch OFF during the confirmation driving pattern. This switches the diagnosis system from the check mode to the normal mode, so all the DTCs and freeze flame data will be erased. DATA LIST Engine Speed Time Idling 5 minutes and 45 seconds or more 1,000 rpm 4 minutes or more 2,000 rpm 2 minutes and 30 seconds or more 3,000 rpm 1 minute and 30 seconds or more
6. Check whether there is misfire or not by monitoring the DTC and the freeze frame data. After that, record them.
7. Turn the ignition switch OFF and wait at least 5 seconds.

TYPICAL MALFUNCTION THRESHOLDS

Scheme 659

COMPONENT OPERATING RANGE

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

Scheme 660

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

1. TID (Test Identification) is assigned to each emission-related component.
2. TLT (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
3. CID (Component Identification) is assigned to each test value.
4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

TID $01: Catalyst-Using Front HO2S and Rear HO2S

TID $01 CATALYST-USING FRONT HO2S AND REAR HO2S - RESULT

Scheme 661

Scheme 662

1. Connect the hand-held tester to the DLC3, or connect the tester probes of the oscilloscope between terminals OX1 A, OX1B and E1 of the ECM connector.
2. Start the engine and warm it up with all the accessories switched OFF until the engine coolant temperature becomes stable.
3. Run the engine at 2,500 to 3,000 rpm for approximately 3 minutes.
4. After confirming that the waveform of the bank 1 sensor 1 (OX1 A) which oscillates between 0 V and 1 V under a feedback to the ECM, check the waveform of the bank 1 sensor 2 (OX1 B).

HINT

1. If there is a malfunction in the system, the waveform of "sensor 2" (OX1B) may become a similar to the one of "sensor 1" (OX1A) as shown in the diagram on the left.
2. There are some cases where, even though a malfunction exists, the MIL may either light up or not light up.

Same as P0442 (see DTC P0442 Evaporative Emission Control System Leak Detected (Small Leak), DTC P0456 Evaporative Emission Control System Leak Detected (Very Small Leak) )

Scheme 663

Scheme 664

The detailed information is described in "CHECKING MONITOR STATUS" (see PRE-CHECK ).

1. TID (Test Identification) is assigned to each emission-related component.
2. TLT (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
3. CID (Component Identification) is assigned to each test value.
4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

Scheme 665

Scheme 666

1. The detailed information is described in "CHECKING MONITOR STATUS" (see «PRE-CHECK»(ref-206112-S06872093152005112400000) ). TID (Test Identification) is assigned to each emission-related component.
2. TLT (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
3. CID (Component Identification) is assigned to each test value.
4. Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.

Scheme 667

Scheme 668

Scheme 669

Scheme 670

Scheme 671

Scheme 672

Scheme 673

1. Check that fuel tank cap meets OEM specifications. NG : Replace with a cap that meets OEM specifications. OK : Go to next step.
2. Check that fuel tank cap is correctly installed. NG : Correctly install fuel tank cap. OK : Go to next step.
3. Check fuel tank cap (See «INSPECTION»(ref-206125-S08304753912006073100000) ). NG : Replace fuel tank cap. OK : Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG : Replace filler pipe. OK : Go to next step.
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the EVAP VSV from the charcoal canister. Start the engine. Select the menu "EVAP VSV (ALON) / ALL" in the ACTIVE TEST and operate EVAP VSV (Press the right or left button). CHECK: When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK: Go to step 9 . NG : Go to next step.
6. Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
7. Check operation of EVAP VSV (See VSV FOR EVAPORATIVE EMISSION (EVAP) in «SFI»(ref-206126) ). NG : Replace EVAP VSV. OK : Go to next step.
8. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
9. Check CCV. PREPARATION: Disconnect the vacuum hose for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "CAN CTRL VSV / ALL" in the ACTIVE TEST and operate CAN CTRL VSV (Press the right or left button). CHECK: Check the CCV operation when it is operated by the hand-held tester. OK: CCV is ON: Air does not flow from port E to port F. CCV is OFF: Air from port E flows out through port F. OK: Go to step 13 . NG : Go to next step.
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes damages, and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
11. Check operation of CCV (See VSV FOR CANISTER CLOSED VALVE (CCV) in «SFI»(ref-206126) ). NG : Replace CCV. OK : Go to next step.
12. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
13. Check pressure switching valve. PREPARATION: Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "TANK BYPASS VSV / ALL" in the ACTIVE TEST and operate TANK BYPASS VSV (Press the right or left button). CHECK: Check the pressure switching valve operation when it is operated by the hand-held tester. OK: Pressure switching valve is ON: Air from port E flows out through port F. Pressure switching valve is OFF: Air does not flow from port E to port F. OK: Go to step 16 . NG : Go to next step.
14. Check operation of pressure switching valve (See VSV FOR PRESSURE SWITCHING VALVE in «SFI»(ref-206126) ). NG : Replace pressure switching valve. OK : Go to next step.
15. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG : Repair or replace evaporative emission leak part. OK : Go to next step.
17. Check vacuum hoses between vapor pressure sensor and fuel tank, and charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG : Repair or replace vacuum hose. OK : Go to next step.
18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel evap pipe (See «INSPECTION»(ref-206125-S08304753912006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG : Repair or replace hose and tube. OK : Go to next step.
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connector under following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 22 . NG : Go to next step.
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
22. Check fuel tank inlet valve. NG : Replace fuel tank inlet valve. OK : Go to next step.
23. Check fuel tank. NG : Replace fuel tank. OK : Go to next step.
24. Check charcoal canister for cracks, holes and damages. NG : Repair or replace charcoal canister. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 674

Scheme 675

Scheme 676

Scheme 677

Scheme 678

Scheme 679

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go to next step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to next step.
3. Check fuel tank cap (See «INSPECTION»(ref-206125-S08304753912006073100000) ). NG: Replace fuel tank cap. OK: Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to next step.
5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emission leak part. OK: Go to next step.
6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve, and pressure switching valve and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG: Repair or replace vacuum hose. OK: Go to next step.
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel evap pipe (See «INSPECTION»(ref-206125-S08304753912006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go to next step.
8. Check vacuum hoses ((8), (9), (10) and (11) in see scheme 262 in circuit description). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes damage, and blockages. NG: Repair or replace vacuum hose. OK: Go to next step.
9. Check connector for EVAP VSV, connector for CCV, connector for pressure switching valve and vapor pressure sensor connector for looseness and disconnection. NG: Repair or connect VSV or sensor connector. OK: Go to next step.
10. Check charcoal canister for cracks, holes and damages. NG: Check and replace charcoal canister. OK: Go to next step.
11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK: Go to next step.
12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connector under following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14. NG: Go to next step.
13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
14. Check EVAP VSV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal EVP of the ECM connector and body ground (ON). Disconnect the terminal EVP of the ECM connector and body ground (OFF). OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17. NG: Go to next step.
15. Check operation of EVAP VSV (See VSV FOR EVAPORATIVE EMISSION (EVAP) in «SFI»(ref-206126) ). NG: Replace EVAP VSV. OK: Go to next step.
16. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
17. Check CCV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the CCV function. Connect the terminal CCV of the ECM connector and body ground (ON). Disconnect the terminal CCV of the ECM connector and body ground (OFF). OK: CCV is ON: Air does not flow from port E to port F. CCV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to next step.
18. Check operation of CCV (See VSV FOR CANISTER CLOSED VALVE (CCV) in «SFI»(ref-206126) ). NG: Replace CCV. OK: Go to next step.
19. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
20. Check pressure switching valve. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the pressure switching valve function. Connect the terminal TBP of the ECM connector and body ground (ON). Disconnect the terminal TBP of the ECM connector and body ground (OFF). OK: Pressure switching valve is ON: Air from port E flows out through port F. Pressure switching valve is OFF: Air does not flow from port E to port F. OK: Go to step 23. NG: Go to next step.
21. Check operation of pressure switching valve (See VSV FOR PRESSURE SWITCHING VALVE in «SFI»(ref-206126) ). NG: Replace pressure switching valve. OK: Go to next step.
22. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
23. Check fuel tank inlet valve. NG: Replace fuel tank inlet valve. OK: Go to next step.
24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

TYPICAL MALFUNCTION THRESHOLDS

Scheme 680

TYPICAL MALFUNCTION THRESHOLDS

Scheme 681

TYPICAL ENABLING CONDITIONS

Scheme 682

TYPICAL MALFUNCTION THRESHOLDS

Scheme 683

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (Intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 684

Scheme 685

Scheme 686

Scheme 687

If the Electronic Throttle Control System (ETCS) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimal speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 688

Scheme 689

TYPICAL MALFUNCTION THRESHOLDS

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 690

Scheme 691

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

Scheme 692

If the ETCS (Electronic Throttle Control System) has a malfunction, the ECM cuts off current to the throttle control motor. The throttle control valve returns to a predetermined opening angle (approximately 16°) by the force of the return spring. The ECM then adjusts the engine output by controlling the fuel infection (intermittent fuel-cut) and ignition timing in accordance with the accelerator pedal opening angle to enable the vehicle to continue at a minimum speed.

If the accelerator pedal is depressed firmly and slowly, the vehicle can be driven slowly.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 693

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator pedal opening to allow the vehicle to continue driving.

If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed. In this case, the throttle valve will remain closed as if the engine is idling.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 694

TYPICAL ENABLING CONDITIONS

Scheme 695

COMPONENT OPERATING RANGE

Scheme 696

The accelerator pedal position sensor has two (main and sub) sensor circuits. If a malfunction occurs in either of the sensor circuits, the ECM detects the abnormal signal voltage difference between the two sensor circuits and switches to limp mode. In limp mode, the remaining circuit is used to calculate the accelerator pedal opening to allow the vehicle to continue driving.

If both circuits malfunction, the ECM regards the opening angle of the accelerator pedal to be fully closed. In this case, the throttle valve will remain closed as if the engine is idling.

If a "pass" condition is detected and then the ignition switch is turned OFF, the fail-safe operation will stop and the system will return to normal condition.

Scheme 697

Scheme 698

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

Scheme 699

Hand-held tester

HINT

To check the pressure condition in the secondary air passage, the hand-held tester is available.

Scheme 700

Scheme 701

Scheme 702

1. Is the DTC P2440 or P2441 being output. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT Display (DTC output) Proceed to P2440 or P2441 A P2440, P2441 and other DTCs B HINT: If any other codes besides P2440 or P2441 are output, perform the troubleshooting for those DTCs first. B : Go to DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A: Go to next step.
2. Check VSV for secondary air injection system. PREPARATION: Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON and push the hand-held tester main switch ON. Disconnect the air injection system hose No. 6. Start the engine. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/SECOND AIR VSV / ALL or USER DATA (press the right or left button). NOTE: When selecting USER DATA, select SECONDARY AIR" and "SECOND AIR VSV" on the screen by pressing the "YES" button on the tester. HINT: When operating the VSV in the secondary air system, the air pump is also operated at the same time. CHECK: Put your hand at the disconnected hose end, and check that the exhaust gas pressure pulsation is applied to your hand when turning on the VSV for air switching valve with the ACTIVE TEST. And also check that the exhaust gas pressure pulsation is not applied to your hand when turning off the VSV for air switching valve. NOTE: This test allows the technician to operate the VSV for only 5 seconds. If you perform the test again, more than 30 seconds interval must be required after the previous test is done. HINT: "SECONDARY AIR (air pump)" means the signal output from the ECM to operate the air pump. OK : Go to step 9 . NG : Go to next step.
3. Check air injection system No. 1 hose. CHECK: Check that the air injection hose No. 1 is securely connected to both exhaust manifold and air switching valve. Inspect the air injection hose No. 1 for blockage or damage. NG : Repair or replace air injection system No. 1 hose. OK : Go to next step.
4. Check stored DTC. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTC using the hand-held tester. DTC OUTPUT RESULT Display (DTC Output) Proceed to P2440 A P2441 B A : Go to step 6 . B : Go to next step.
5. Check vacuum hose and check valve. CHECK: Check each vacuum hose connection between the pressure sensor and air switching valve, the air switching valve and the VSV, and the VSV and intake manifold. Inspect the vacuum hose for blockage or damage. Check that check valve is correctly installed. Check that there is air-flow in the check valve from the VSV to the engine. Also, check that there is no air-flow in the opposite side. NG : Repair or replace vacuum hose and check valve. OK : Go to next step.
6. Check air switching valve (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air switching valve. OK : Go to next step.
7. Check vacuum switch valve (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace vacuum switching valve. OK : Go to next step.
8. Check for open and short in harness and connector between ECM and VSV for secondary air injection system. NG : Repair or replace harness or connector. OK : Go to next step.
9. Inspect ECM (air voltage). PREPARATION: Connect the pressure gauge to the pressure sensor as shown in the illustration. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON and push the hand-held tester main switch ON (Do not start engine). Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / 2ND AIR PRESS. CHECK: Check that the pressure displayed on the hand-held tester fluctuates when applying the pressure to the pressure sensor with the pressure gauge. NG : Replace pressure sensor. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 703

Scheme 704

Scheme 705

1. Is the DTC P2440 or P2441 being output. PREPARATION: Connect the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the OBD II scan tool main switch ON. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT Display (DTC output) Proceed to P2440 or P2441 A P2440, P2441 and other DTCs B HINT: If any other codes besides P2440 or P2441 are output, perform the troubleshooting for those DTCs first. B : Go to DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Check stored DTC. CHECK: Read the DTC using the OBD II scan tool. DTC OUTPUT RESULT Display (DTC Output) Proceed to P2440 A P2441 B A : Go to step 4 . B : Go to next step.
3. Check air injection system No. 1 hose. CHECK: Check that the air injection hose No. 1 is securely connected to both exhaust manifold and air switching valve. Inspect the air injection hose No. 1 for blockage or damage. NG : Repair or replace air injection system No. 1 hose. OK : Go to next step.
4. Check vacuum hose and check valve. CHECK: Check each vacuum hose connection between the pressure sensor and air switching valve, the air switching valve and the VSV, and the VSV and intake manifold. Inspect the vacuum hose for blockage or damage. Check that check valve is correctly installed. Check that there is air-flow in the check valve from the VSV to the engine. Also, check that there is no air-flow in the opposite side. NG : Repair or replace vacuum hose and check valve. OK : Go to next step.
5. Check air switching valve (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air switching valve. OK : Go to next step.
6. Check vacuum switch valve (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace vacuum switching valve. OK : Go to next step.
7. Check for open and short in harness and connector between ECM and VSV for secondary air injection system (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Go to next step.
8. Inspect ECM (air voltage). PREPARATION: Connect the pressure gauge to the air pressure sensor as shown in the illustration. Turn the ignition switch ON (Do not start engine). CHECK: Check for voltage change between terminals AIP and E2 of the ECM connector when applying the pressure to the pressure sensor with the pressure gauge. NG : Replace pressure sensor. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

HINT

To check the pressure condition in the secondary air passage, the hand-held tester is available.

Scheme 706

Scheme 707

Scheme 708

Scheme 709

Scheme 710

1. Is the DTC P2444 and P2445 being output. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT Display (DTC output) Proceed to P2444 or P2445 A "P2444, P2445" and other DTCs B HINT: If any other codes besides P2444 or P2445 is output, perform the troubleshooting for those DTCs first. B : Go to DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Perform active test by hand-held tester (VSV for secondary air injection system). PREPARATION: Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON and push the hand-held tester main switch ON. Start the engine. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / SECOND AIR VSV / ALL or USER DATA (press the right or left button). NOTE: When selecting USER DATA, select SECONDARY AIR" and "SECOND AIR VSV" on the screen by pressing the "YES" button on the tester. HINT: When operating the VSV in the secondary air system, the air pump is also operated at the same time. CHECK: Check that the SECONDARY AIR, SECOND AIR VSV and 2ND AIR PRESS on the hand-held tester indicate the same conditions as the chart below. NOTE: This test allows the technician to operate the VSV for only 5 seconds. If you perform the test again, more than 30 seconds interval must be required after the previous test is done. HINT: *1: Means the signal output from the ECM to operate the air pump. *2: Means the signal output from the ECM to operate the VSV. *3: Means the difference between the air pressure inside the air pressure sensor and the atmospheric pressure. When the pressure inside the secondary air injection system is equal to the atmospheric pressure, the hand-held tester displays "0 kPa." NG : Go to step 12 . OK : Go to next step.
3. Check stored DTC. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES." CHECK: Read the DTC using the hand-held tester. DTC OUTPUT RESULT Display (DTC Output) Proceed to P2444 A P2445 B A : Go to step 10 . B : Go to next step.
4. Check vacuum hose. CHECK: Check the vacuum hose connection between the pressure sensor and air switching valve. Inspect the vacuum hose for blockage or damage. NG : Repair or replace vacuum hose. OK : Go to next step.
5. Check connection of air injection system piping. CHECK: Check that all the pipes and hoses between the air pump and air switching valve are securely connected. Inspect the pipe and hoses for blockage or damage. NG : Repair or replace air injection system piping. OK : Go to next step.
6. Check A-AMP fuse. PREPARATION: Remove the A-AMP fuse from the engine room R/B. CHECK: Check the resistance in the A-AMP fuse. OK: Below 1ohm NG : Check for short in all harnesses and components connected fuse. OK : Go to next step.
7. Check air pump relay (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air pump relay. OK : Go to next step.
8. Check voltage of air pump motor power source. Disconnect the air pump motor connector. Measure voltage between terminal 4 of the air pump assembly connector and body ground. Standard: 9 to 14 V NG : Repair air pump power source circuit. OK : Go to next step.
9. Check for open in harness and connector between air pump motor and body ground. Disconnect the air pump assembly connector. Check the resistance between the wire harness side connectors. Standard (Check for open): TESTER OPERATION AND SPECIFIED CONDITION Tester Connection Specified Condition Air Pump Assembly (A22-2) - Body ground Below 1 ohm Reconnect the air pump assembly connector. NG : Repair or replace harness or connector. OK : Go to next step.
10. Inspect air pump assy (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air pump assy (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). OK : Go to next step.
11. Check for open and short in harness and connector between ECM and air pump relay (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Go to next step.
12. Inspect ECM (air voltage). Connect the pressure gauge to the pressure sensor as shown in the illustration. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON and push the hand-held tester main switch ON (Do not start engine). Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / 2ND AIR PRESS. Check that the pressure displayed on the hand-held tester fluctuates when applying the pressure to the pressure sensor with the pressure gauge. NG : Replace pressure sensor. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 711

Scheme 712

Scheme 713

Scheme 714

1. Is the DTC P2444 or P2445 being output. PREPARATION: Connect the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the OBD II scan tool main switch ON. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT Display (DTC output) Proceed to P2444 or P2445 A P2444, P2445 and other DTCs B HINT: If any other codes besides P2444 or P2445 are output, perform the troubleshooting for those DTCs first. B : Go to DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Check stored DTC. Read the DTC using the OBD II scan tool. DTC OUTPUT RESULT Display (DTC Output) Proceed to P2444 A P2445 B A : Go to step 9 . B : Go to next step.
3. Check vacuum hose. NG : Repair or replace vacuum hose. OK : Go to next step.
4. Check connection of air injection system piping. Check that all the pipes and hoses between the air pump and the air switch are securely connected. Inspect the pipe and hoses for blockage or damage. NG : Repair or replace air injection system piping. OK : Go to next step.
5. Inspect A-AMP fuse. PREPARATION: Remove the A-AMP fuse from the engine room R/B. CHECK: Check the resistance in the A-AMP fuse. OK: Below 1 ohm NG : Check for short in all harnesses and components connected to fuse. OK : Go to next step.
6. Check air pump relay (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air pump relay. OK : Go to next step.
7. Check voltage of air pump motor power source. Disconnect the air pump motor connector. Measure voltage between terminal 2 of the air pump assembly connector and body ground. Standard: 9 to 14V NG : Repair air pump power source circuit. OK : Go to next step.
8. Check for open in harness and connector between air pump motor and body ground. NG : Repair or replace harness or connector. OK : Go to next step.
9. Check air pump assy (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). NG : Replace air pump assy (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). OK : Go to next step.
10. Check for open and short in harness and connector between ECM and air pump relay (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Go to next step.
11. Inspect ECM (air voltage). Connect the pressure gauge to the pressure sensor as shown in the illustration. Turn the ignition switch ON (Do not start engine). Check for voltage changes between terminals AIP and E2 of the ECM connector when applying the pressure to the pressure sensor with the pressure gauge. NG : Replace pressure sensor. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

TYPICAL MALFUNCTION THRESHOLDS

Scheme 715

COMPONENT OPERATING RANGE