Engine Controls (1ZZ-FE) - Diagnostics: Diagnosis Toyota Celica T230 рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the procedure on the following page.

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1. DIAGNOSIS SYSTEM Description When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand-held tester. Various data output from the vehicle's ECM can then be read. OBD II regulations require that the vehicle's onboard computer illuminates the Malfunction Indicator Light (MIL) on the instrument panel when the computer detects a malfunction in: 1) the emission control system/components, or 2) the power train control components (which affect vehicle emissions), or 3) The computer. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the ECM memory (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). If the malfunction does not reoccur in 3 consecutive trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory. To check the DTC, connect the hand-held tester or OBD II scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The hand-held tester or OBD II scan tool also enables you to erase the DTC and check the freeze frame data and various forms of engine data (See the instruction manual for the OBD II scan tool or the hand-held tester). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set according to the SAE, while manufacturer controlled codes can be set by a manufacturer with certain restrictions (See the DTC chart on «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). The diagnosis system operates in "normal mode" during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate detection of malfunctions. A "check mode" is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (See step 3 ). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory. This is known as 1st trip detection. If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate. This is known as 2nd trip detection. Freeze frame data: The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determining if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time when a malfunction occurred. Priorities for troubleshooting: When multiple DTCs occur, find out the order in which the DTCs should be inspected by checking the component's DTC chart. If no instructions are written in the DTC chart, check DTCs in the following order of priority: DTCs other than fuel trim malfunction DTCs (P0171 and P0172) and misfire DTCs (P0300 to P0304). Fuel trim malfunction DTCs (P0171 and P0172). Misfire DTCs (P0300 to P0304). Check the DLC3. The vehicle's ECM uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. DLC3 TERMINALS IDENTIFICATION Symbol Name Result (Terminal No.) (Reference terminal) (Condition) SIL Bus "+" line Pulse generation (7) (5 - Signal ground) (During transmission) CG Chassis ground 1 ohm or less (4) (Body ground) (Always) SG Signal ground 1 ohm or less (5) (Body ground) (Always) BAT Battery positive 9 to 14V (16) (Body ground) (Always) HINT: Connect the cable of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual. Inspect the battery voltage. Battery Voltage: 11 to 14V If voltage is below 11 V, recharge the battery before proceeding. Check the MIL. The MIL comes on when the ignition switch is turned ON and the engine is not running. HINT: If the MIL is not illuminated, troubleshoot the MIL circuit (See «MIL CIRCUIT»(ref-206112-S17391056732005112400000) ). When the engine is started, the MIL should not illuminate. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
2. DTC CHECK (Normal Mode) NOTE: If no DTC appears in normal mode: On the OBD II scan tool or the hand-held tester, check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979). When the diagnosis system is changed from normal mode to check mode or vice-versa, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing modes, always check and make a note of DTCs and freeze frame data. Checking DTCs using the OBD II scan tool or hand-held tester. Connect the OBD II scan tool or the hand-held tester to DLC3. Turn the ignition switch ON. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and then write them down. For the hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. For the OBD II scan tool, see its instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For DTCs chart subject to "2 trip detection logic", perform either of the following actions. Check the pending fault code: For the hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/PENDING CODES. Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL come on and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clearing the DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the handheld tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs not using the OBD II scan tool or the hand-held tester. Remove the EFI fuse from the engine room J/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure.
3. DTC CHECK (Check Mode) HINT: Hand held tester only: Check mode has a higher sensitivity to detect malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. Follow these steps when preparing to use the hand-held tester check mode. Make sure that the items below are true: Battery positive voltage 11 V or more Throttle valve fully closed Transmission in the P or N position A/C switched OFF Turn the ignition switch OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Change the ECM to check mode with the handheld tester. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/CHECK MODE. Make sure the MIL flashes as shown in the illustration. NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF. Start the engine. The MIL should turn off after the engine starts. Simulate the conditions of the malfunction described by the customer. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data. After checking the DTC, inspect the applicable circuit. Clearing DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS ENHANCED OBD II/DTC INFO/CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs without using the OBD II scan tool or the hand-held tester. Remove the EFI fuse from the engine room J/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure.
4. FAIL-SAFE CHART If any of the following codes is recorded, the ECM enters fail-safe mode. FAIL-SAFE CHART DTC No. Fail-Safe Operation Fail-Safe Deactivation Conditions P0100 Ignition timing fixed at 5° BTDC Returned to normal condition P0110 Intake air temperature is fixed at 20°C (68°F) Returned to normal condition P0115 Engine coolant temperature is fixed at 80° (176°F) Returned to normal condition P0120 VTA is fixed at 0° The following condition must be repeated at least 2 times consecutively P0120 VTA is fixed at 0° VTA is greater than or equal to 0.1 V and less than or equal to 0.95 V P0325 Max. Timing retardation Ignition switch OFF P0336 Fuel cut Returned to normal condition P0351 Fuel cut IGF signal is detected for 4 consecutive ignitions
5. CHECK FOR INTERMITTENT PROBLEMS Hand held tester only: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic. Clear the DTCs. (See step 2 ) Set the check mode. (See step 3 ) Perform a simulation test (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). Check the connector and terminal (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). Wiggle the harness and connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ).
6. BASIC INSPECTION When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location causing the problem can be found quickly and efficiently. Therefore, using this check is essential in the engine troubleshooting. Is battery positive voltage 11 V or more when engine is stopped? NO : Charge or replace battery. YES : go to next step. Is engine cranked? NO : Proceed to page and continue to troubleshoot. YES : Go to next step. Does engine start? NO : Go to step 6 . YES : Go to next step. Check air filter. PREPARATION: Remove the air filter. CHECK: Visual check that the air filter is not excessively dirty or oily. NG : Repair or replace. OK : Go to next Step. Check idle speed. PREPARATION: Warm up the engine to normal operating temperature. Switch off all accessories. Switch off air conditioning. Shift transmission into "N" position. Connect the OBD II scan tool or the hand-held tester to DLC3 on the vehicle. CHECK: Use CURRENT DATA to check the idle speed. OK: Idle speed: 650 to 750 RPM NG : Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-206111-S23280708212005112400000) . OK : Go to next step. Check fuel pressure. PREPARATION: Be sure that enough fuel is in the tank. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Use ACTIVE TEST mode to operate the fuel pump. HINT: Please refer to the hand-held tester operator's manual for further details. If you have no hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See «SFI»(ref-206126) ). CHECK: Check for fuel pressure in the fuel inlet hose when it is pinched off. HINT: At this time, you will hear a fuel flowing noise. NG : Proceed to «SFI»(ref-206126) and continue to troubleshoot. OK : Go to next step. Check for spark. PREPARATION: Disconnect the ignition coil assembly from the spark plug. Remove the spark plug. Install the spark plug the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while engine is being cranked. NOTE: To prevent excess fuel being injected from the injectors during this test, don't crank the engine for more than 5 - 10 seconds at a time. NG : Proceed to «ON-VEHICLE INSPECTION»(ref-206133-S19742093492005112400000) and continue to troubleshoot. OK : Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-206111-S23280708212005112400000) .
7. DATA LIST HINT: Using the hand-held tester DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten labor time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST. According to the display on tester, read the "DATA LIST".
8. ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester or the OBD II scan tool. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST. According to the display on tester, perform the "ACTIVE TEST".
9. DEFINITION OF TERMS DEFINITION OF TERMS Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). Related DTCs Diagnostic code Typical enabling condition Preconditions that allow the ECM to detect malfunctions. Typical enabling condition With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction threshold(s). Sequence of operation The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction. Sequence of operation When a sensor is being monitored, the next sensor or component will not be monitored until the sensor monitoring is finished. Required sensor/components The sensors and components that are used by the ECM to detect malfunctions. Frequency of operation The number of times that the ECM checks for malfunctions per driving cycle. Frequency of operation "Once per driving cycle" means that the ECM detects the malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects malfunction every time an enabling condition is met. Duration The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met. Malfunction thresholds Beyond this value, the ECM will conclude that there is a malfunction and set a DTC. MIL operation MIL illumination timing after a defect is detected. MIL operation "Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction. MIL operation "2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving cycle.
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used in this manual along with their definitions. TOYOTA/LEXUS PART AND SYSTEM NAME LIST TOYOTA/LEXUS name Definition Toyota HCAC system, Hydro-carbon Absorptive Catalyst (HCAC) system, HC adsorptive three-way catalyst HC adsorptive three-way catalytic converter Variable Valve Timing sensor, VVT sensor Camshaft position sensor Variable valve timing system, VVT system Camshaft timing control system Camshaft timing oil control valve, Oil control valve, OCV, VVT, VSV Camshaft timing oil control valve Variable timing and lift, VVTL Camshaft timing and lift control Crankshaft position sensor "A" Crankshaft position sensor Engine speed sensor Crankshaft position sensor THA Intake air temperature Knock control module Engine knock control module Knock sensor Engine knock sensor Mass or volume air flow circuit Mass air flow sensor circuit Vacuum sensor Manifold air pressure sensor Internal control module, Control module, Engine control ECU, PCM Power train control module FC idle Deceleration fuel cut Idle air control valve Idle speed control VSV for CCV, Canister close valve VSV for canister control Evaporative emissions canister vent valve VSV for EVAP, Vacuum switching valve assembly No. 1, EVAP VSV, Purge VSV Evaporative emissions canister purge valve VSV for pressure switching valve, Bypass VSV Evaporative emission pressure switching valve Vapor pressure sensor, EVAP pressure sensor, Evaporative emission control system pressure sensor Fuel tank pressure sensor Charcoal canister Evaporative emissions canister ORVR system On-board refueling vapor recovery system Intake manifold runner control Intake manifold tuning system Intake manifold runner valve, IMRV, IACV (runner valve) Intake manifold tuning valve Intake control VSV Intake manifold tuning solenoid valve AFS Air fuel ratio sensor O2 sensor Heater oxygen sensor Oxygen sensor pumping current circuit Oxygen sensor output signal Oxygen sensor reference ground circuit Oxygen sensor signal ground Accel position sensor Accelerator pedal position sensor Throttle actuator control motor, Actuator control motor, Electronic throttle motor, Throttle control motor Electronic throttle actuator Electronic throttle control system, Throttle actuator control system Electronic throttle control system Throttle/pedal position sensor. Throttle/pedal position switch, Throttle position sensor/switch Throttle position sensor Turbo press sensor Turbocharger pressure sensor Turbo VSV Turbocharger pressure control solenoid valve P/S pressure switch Power-steering pressure switch VSV for ACM Active control engine mount Speed sensor, Vehicle speed sensor "A", Speed sensor for skid control ECU Vehicle speed sensor ATF temperature sensor, Trans. fluid temp. sensor, ATF temperature sensor "A" Transmission fluid temperature sensor Electronic controlled automatic transmission, ECT Electronically controlled automatic Intermediate shaft speed sensor "A" Counter gear speed sensor Output speed sensor Output shaft speed sensor Input speed sensor, Input turbine speed sensor "A", Speed sensor (NT), Turbine speed sensor Input turbine speed sensor PNP switch, NSW Park/neutral position switch Pressure control solenoid Transmission pressure control solenoid Shift solenoid Transmission shift solenoid valve Transmission control switch, Shift lock control unit Shift lock control module Engine immobilizer system, Immobilizer system Vehicle anti-theft system
11. The monitor will run whenever the following DTCs are not present (Monitor disablement List) HINT: This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on the left are being set. As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not performed.
12. O2S TEST RESULT INTRODUCTION The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBD II scan tool. Based on this, you can find the O2S's conditions. The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snap shot" value that is taken after monitoring and therefore it is not dynamic. In this repair manual, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items: TEST ID (a code applied to each TEST DATA) Description of TEST DATA Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.) Unit Standard Value If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the border line of the standard value, the O2S may malfunction very soon. HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER Connect the hand-held tester to the DLC3. On the tester screen, select the following menus: DIAGNOSIS/CARB OBDII/O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed. Select the desired O2S and press ENTER. The following screen will appear. Press HELP and * simultaneously. More information will appear. Example: The hand-held tester displays "17" as a value of the "TIME $81" (see the illustration on the left). Find the Conversion Factor value of "TIME $81" in the O2S TEST RESULT chart below. 0.3906 is specified for $81 in this chart. Multiply "17" in step ( 1 ) by 0.3906 (Conversion Factor) in the step ( 2 ). 17 x 0.3906 = 6.6% If the answer is within the standard value, the "TIME $81" can be confirmed to be normal. O2S TEST RESULT Chart TEST RESULT CHART TEST ID Description of TEST DATA Conversion Factor Unit Standard Value $81 Percentage of monitoring time when the HO2S voltage is less than 0.05V Multiply 0.3906 % Within 60 %
13. CHECKING MONITOR STATUS NOTE: The Monitor Status is not applicable to the heated oxygen sensor (HO2S). The HO2S status can be checked with O2S TEST RESULT. INTRODUCTION The purpose of the monitor result (mode 6) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, EVAP and thermostat. The monitor result allows the OBD scan tool to display the monitor status, test value and test limit. The monitor status indicates whether the component is functioning normally or not (PASS or FAIL). The test value is the value that was used to determine the monitor status. When the test value is inside the test limit, the ECM determines the component is functioning normally (PASS). If the test value is outside the test limit, the ECM determines the component is malfunctioning (FAIL). A problem in these components/systems can be found by comparing the test value and test limit. The monitor result information is included under "MONITOR RESULT" in the DTC sections. PROCEDURE NOTE: The monitor result and test value are cleared when the ignition switch is turned OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Clear the DTCs. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN (see «READINESS MONITOR DRIVE PATTERN»(ref-206111-S00328837372005112400000) ). Select from the tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name. INCMP: The component has not been monitored yet. PASS: The component is functioning normally. FAIL: The component is malfunctioning. Confirm that the component is set to either PASS or FAIL. Select the component (Label) and press ENTER. The accuracy test value appears when the monitor result is either PASS or FAIL. VAL The test value LMT: The test limit TLT: The test limit type. Either 0 or 1 is displayed. 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. Compare the test value with the test limit. The test value is usually significantly higher or lower than the test limit. If the test value is on the borderline of the test limit, there is a potential malfunction in the component. HINT: The monitor result might on rare occasions be PASS even if the MIL is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

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1. PURPOSE OF THE READINESS TESTS The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components and report any detected abnormalities in the form of Diagnostic Trouble Codes (DTCs). Since the various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors. Many state Inspection and Maintenance (I/M) programs require that vehicles complete their Readiness Monitors prior to beginning an emission test. The current status of the Readiness Monitors can be seen by using the hand-held tester with version 9.0 software (or newer), or a generic OBD II Scan tool. To view the Readiness Monitor status using the hand-held tester, select "Monitor Status" from the Enhanced OBD II Menu. A status of "complete" indicates that the necessary conditions have been met to run the performance tests for the related Readiness Monitor. The Readiness Monitor will be reset to "incomplete" if: ECM has lost power (battery or fuse). DTCs have been cleared. The conditions for running the Readiness Monitor have not been met. In the event that any Readiness Monitor shows "incomplete," follow the appropriate Readiness Monitor Drive Pattern to active the monitor and change the readiness status to "complete." CAUTION: Strictly observe of posted speed limits, traffic laws, and road conditions when performing these drive patterns. NOTE: These drive patterns represent the fastest method to satisfy all necessary conditions which allow the specific readiness monitor to complete. In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other factors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to "complete". To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).
2. CATALYST MONITOR (O2S TYPE) Preconditions The monitor will not run unless: MIL is OFF. Engine Coolant Temperature (ECT) is 75°C (167°F) or greater. Intake Air Temperature (IAT) is -10°C (14°F) or greater. NOTE: The readiness test can be completed in cold ambient conditions (less than -10°C/14°F), if the drive pattern is repeated a second time after cycling the ignition off. Drive Pattern Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions. Drive the vehicle at 40 to 55 mph (64 to 88 km/h) for approximately for 3 minutes. NOTE: Drive with smooth throttle operation and avoid sudden acceleration. If IAT is less than 10°C (50°F) when engine was started, drive the vehicle at 40 to 55 mph (64 to 88 km/h) for additional 4 minutes. Drive the vehicle at 35 to 45 mph (56 to 72 km/h) for approximately 7 minutes. NOTE: Drive with smooth throttle operation and avoid sudden deceleration as much as possible with the throttle fully closed. If readiness status does not switch to complete, make sure that the preconditions are met and the ignition switch is turned OFF and then repeat steps (2) and (3). Release pressure in the fuel tank by removing and then reinstalling the fuel tank cap. Start the engine and immediately begin driving as directed.
3. EVAP MONITOR (VACUUM PRESSURE MONITOR) NOTE: A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pressure Readiness Monitor. Cold Soak Preconditions The monitor will not run unless: MIL is OFF Fuel level is approximately 1/2 to 3/4 Altitude is 7,800 feet (2,400m) or less Cold Soak Procedure Let the vehicle cold soak for 8 hours or until the difference between IAT and ECT becomes less than 7°C (13°F) HINT: Examples: Scenario 1 ECT = 24°C (75°F) IAT = 16°C (60°F) Difference between ECT and IAT is 8°C (15°F) --> The monitor will not run because difference between ECT and IAT is greater than 7°C (13°F) Scenario 2 ECT = 21°C (70°F) IAT = 20°C (68°F) Difference between ECT and IAT is 1°C (2°F) --> The monitor will run because difference between ECT and IAT is less than 7°C (13°F)
4. EVAP MONITOR (VACUUM PRESSURE MONITOR) (CONTINUED) Preconditions The monitor will not run unless: MIL is OFF Fuel level is approximately 1/2 to 3/4 Altitude is 7,800 feet (2,400 m) or less Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F) Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F) Cold Soak Procedure has been completed Before starting the engine, the difference between ECT and IAT must be less than 7°C (13°F) HINT: Examples: Scenario 1 ECT = 24°C (75°F) IAT = 16°C (60°F) Difference between ECT and IAT is 8°C (15°F) --> The monitor will not run because difference between ECT and IAT is higher than 7°C (13°F) Scenario 2 ECT = 21°C (70°F) IAT = 20°C (68°F) Difference between ECT and IAT is 1°C (2°F) --> The monitor will run because difference between ECT and IAT is less than 7°C (13°F) The readiness test can be completed in cold ambient conditions (less than 40°F/4.4°C) and/or at high altitudes (more than 7,800 feet/2,400 m) if the drive pattern is repeated a second time after cycling the ignition off. Drive Pattern Connect the OBDII scan tool to DLC3 to check monitor status and preconditions (refer to "a"). Release pressure in fuel tank by removing the fuel tank cap and then reinstalling it. Start the engine and allow it to idle until ECT becomes 75°C (167°F) or higher. Run the engine at 3,000 RPM for about 10 seconds. Allow the engine to idle with the A/C ON (to create slight load) for 15 to 50 minutes. NOTE: If the vehicle is not equipped with A/C, put a slight load on the engine by doing the following: Securely set the parking brake. Block the drive wheels with wheel chocks. Allow the vehicle to idle in drive for 15 to 50 minutes.
5. OXYGEN SENSOR MONITOR (FRONT AND REAR O2S SYSTEM) Preconditions The monitor will not run unless: MIL is OFF Drive Pattern Connect the OBDII scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Start the engine and allow it to idle for 2 minutes or more. Drive the vehicle at 25 mph (40 km/h) or more for at least 50 seconds. Stop the vehicle and allow the engine to idle for 40 seconds or more. Perform steps ( 3 ) and ( 4 ) ten times. Check the status of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure preconditions are met, turn the ignition off and then repeat steps (1) and (5).
6. OXYGEN SENSOR HEATER MONITOR Preconditions The monitor will not run unless: MIL is OFF Drive Pattern Connect the OBDII scan tool to the DLC3 to check monitor status and preconditions (refer to step a ). Start the engine and allow it to idle for 500 seconds or more. Drive the vehicle at 25 mph (40 km/h) or more at least 2 minutes. Check the status of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure the preconditions are met, turn the ignition off and then repeat steps (2) and (3).

DIAGNOSTIC TROUBLE CODE TABLE

DIAGNOSTIC TROUBLE CODE

HINT

Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument or other factors.

If a malfunction code is displayed during the DTC check in check mode, check the circuit for the codes listed in the table below. For details of each code, refer to the "See page" under the respective "DTC No." in the DTC chart.

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Each ECM terminals standard normal voltage is shown in the table below. In the table, first follow the information under "Condition".

Look under "Symbols (Terminals No.)" for the terminals to be inspected.

The standard normal voltage between the terminals is shown under "STD Voltage".

Use the illustration above as a reference for the ECM terminals.

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Scheme 93

CIRCUIT DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT controller. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV, regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on engine operation conditions such as the intake air volume, throttle position and engine coolant temperature. The ECM controls the OCV, based on the signals output from the sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the camshaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using signals from the camshaft position sensor and the crankshaft position sensor, and performs the feedback control. This is how target valve timing is verified by the ECM.

Scheme 94

Scheme 95

INSPECTION PROCEDURE

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

Scheme 96

Scheme 97

1. Check OCV circuit. PREPARATION: Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/VVT CTRL B1. CHECK: Check the engine speed when operating the Oil control valve (OCV) by the hand-held tester. OK: OCV CIRCUIT TESTER OPERATION - SPECIFIED CONDITION Tester Operation Specified Condition OCV is OFF Normal engine speed OCV is ON Rough idle or engine stall OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). NG : Go to next step.
2. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery positive voltage between terminals of the OCV. CHECK: Check the engine speed. OK: Rough idle or engine stalled. NG : Replace OCV. OK : Go to next step.
3. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown. NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
4. Check for open and short in harness and connector between OCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ).

Scheme 98

Scheme 99

1. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery positive voltage between terminals of the OCV. CHECK: Check the engine speed. OK: Rough idle or engine stalled NG : Replace OCV. OK : Go to next step.
2. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown. NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
3. Check for open and short in harness and connector between OCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ).

Refer to DTCs P0010 on DTC P0010 CAMSHAFT POSITION "A" Actuator circuit (Bank 1) .

Scheme 100

INSPECTION PROCEDURE - CAMSHAFT POSITION "A" -TIMING OVER

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 101

1. Check valve timing (Check for loose and jumped tooth of timing chain) (See «TIMING CHAIN»(ref-163200-S28462148812005020100000) ). NG : Adjust valve timing. OK : Go to next step.
2. Check operation of OCV. PREPARATION: Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/VVT CTRL B1. CHECK: Check the engine speed when operating the OCV by the hand-held tester. OK: TESTER OPERATION AND CONDITION CHART Tester Operation Specified Condition OCV is OFF Normal engine speed OCV is ON Rough idle or engine stall NG : Go to step 4 . OK : Go to next step.
3. Check if DTC outputs reoccur. PREPARATION: Clear the DTCs. Operate the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTCs using the hand-held tester. OK: No DTC output. OK : VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG : Go to next step.
4. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown. NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
5. Check oil control valve filter. NG : Replace oil control valve filter. OK : Go to next step.
6. Check oil control valve (See Camshaft Timing Oil Control Valve ). OK : Go to step 8 . NG : Go to next step.
7. Replace oil control valve. Go to next step
8. Check VVT controller assembly (See «INSPECTION»(ref-163200-S10952047122005020100000) ). OK : Go to step 10 . NG : Go to next step.
9. Replace VVT controller assembly. Go to next step
10. Check blockage of OCV, oil check valve and oil pipe No. 1. NG : Repair or replace. OK : Go to next step.
11. Check whether or not DTC P0011 or P0012 is stored. PREPARATION: Clear the DTCs. Operate the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the hand-held tester. OK: No DTC output. OK : VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG : Replace ECM (See Engine Control Module (ECM) ).

Scheme 102

Scheme 103

Scheme 104

1. Check valve timing (Check for loose and jumped tooth of timing chain) (See «TIMING CHAIN»(ref-163200-S28462148812005020100000) ). NG : Adjust valve timing. OK : Go to next step.
2. Check operation of OCV. PREPARATION: Start the engine. CHECK: Check the engine speed when disconnect the OCV connector. Check the engine speed when apply battery positive voltage between terminals of OCV. RESULT: 2 : Replace OCV. 1 : Go to next step
3. Check whether or not DTC P0011 or P0012 is stored. PREPARATION: Clear the DTCs. Operate the OBD II scan tool to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the OBD II scan tool. OK: No DTC output. OK : VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG : Go to next step.
4. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown. NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
5. Check oil control valve filter. NG : Replace oil control valve filter. OK : Go to next step.
6. Check oil control valve (See Camshaft Timing Oil Control Valve ). OK : Go to step 8 . NG : Go to next step.
7. Replace oil control valve. Go to next step
8. Check VVT controller assembly (See «INSPECTION»(ref-163200-S10952047122005020100000) ). OK : Go to step 10 . NG : Go to next step.
9. Replace VVT controller assembly. Go to next step
10. Check blockage of OCV, oil check valve and oil pipe No. 1. NG : Repair or replace. OK : Go to next step.
11. Check whether or not DTC P0011 or P0012 is stored. PREPARATION: Clear the DTCs. Operate the OBD II scan tool to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the hand-held tester. OK: No DTC output. OK : VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG : Replace ECM (See Engine Control Module (ECM) ).

Refer to DTC P0335 on DTC P0335 Crankshaft Position Sensor "A" Circuit Malfunction, DTC P0339 Crankshaft Position Sensor "A" Circuit Intermittent .

Scheme 105

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Check valve timing (Check for loose and jumped tooth of timing chain) (See «TIMING CHAIN»(ref-163200-S28462148812005020100000) ). NG : Adjust valve timing (Repair or replace timing chain). OK : Replace ECM (See Engine Control Module (ECM) ).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) .

HINT

The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated oxygen sensor heater circuit uses a relay on the B+ side of the circuit.

Scheme 106

Scheme 107

HINT

1. Sensor 1 refers to the sensor closer to the engine body.
2. Sensor 2 refers to the sensor farther away from the engine body.

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 108

Scheme 109

Scheme 110

Scheme 111

1. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1:5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2:11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
2. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG : Replace EFI relay. OK : Go to next step.
3. Check voltage between terminals HT1, HT2 of ECM connectors and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminals HT1A, HT1B of ECM connectors and body ground. HINT: Connect terminal HT1A to bank 1 sensor 1. Connect terminal HT1B to bank 1 sensor 2. OK: Voltage: 9 to 14V OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
4. Check for open and short in harness and connector between heated oxygen sensor and ECM, heated oxygen sensor and EFI main relay (Marking: EFI) (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) ).

The MAF (Mass Air Flow) meter measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and provide a proper air-fuel ratio. Inside the MAF meter, there is a heated platinum wire exposed to the flow of intake air.

By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is proportional to the airflow through the sensor and the ECM interprets this voltage as the intake air amount. The circuit is constructed so that the platinum hot wire and the temperature sensor provides a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.

Scheme 112

Scheme 113

HINT

After confirming DTC P0100, confirm the mass air flow ratio in the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL" using the hand-held tester or the OBD II scan tool.

Scheme 114

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 115

Scheme 116

Scheme 117

1. Connect OBD II scan tool or hand-held tester, and read value of mass air flow rate. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. Start the engine. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF. CHECK: Read mass air flow rate on the OBD II scan tool or hand-held tester. RESULT: AIR FLOW RATE - REFERENCE DATA Air Flow Rate (gm/s) Proceed to 0.0 A 271.0 or more B Between 1.0 and 270.0 (1) C (1) The value must be changed when the throttle valve is opened or closed. B : Go to step 6 . C : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). A : Go to next step.
2. Check voltage of mass air flow meter power source. PREPARATION: Disconnect the mass air flow meter connector. Turn ignition switch ON. CHECK: Measure voltage between terminal 1 of mass air flow meter connector and body ground. OK: Voltage: 9 to 14 V NG : Go to step 5 . OK : Go to next step.
3. Check voltage between terminal VG of ECM connector and body ground. PREPARATION: Remove the ECM cover. Start the engine. CHECK: Measure voltage between terminal VG of ECM and body ground while engine is idling. OK: Voltage: 1.1 to 1.5 V (P or N position and A/C switch OFF) OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
4. Check for open and short in harness and connector between mass air flow meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace mass air flow meter.
5. Check for open and short in harness and connector between mass air flow meter and EFI relay (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Check ECM power source circuit (See «ECM Power Source Circuit»(ref-206111-S23255909742005112400000) ).
6. Check continuity between terminal EVG of ECM connector and body ground. PREPARATION: Remove the ECM cover. CHECK: Check continuity between terminal EVG of ECM connector and body ground. OK: Below 1 ohm NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
7. Check for open in harness and connector between mass air flow meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace mass air flow meter.

Refer to DTC P0100 on DTC P0100 Mass or Volume Air Flow Circuit .

Scheme 118

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides DTC P0101) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DISPLAY (DTC OUTPUT) - REFERENCE DATA Display (DTC output) Proceed to P0101 and other DTCs A Only P0101 B HINT: If any other codes besides P0101 are output, perform the troubleshooting for those DTCs first. B : Replace mass air flow meter. A : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ).

The intake air temperature (IAT) sensor, mounted on the mass air flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal. (Scheme 119)

The intake air temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA via resistor R. That is, the resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with the intake air temperature, the potential at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve the drive ability during cold engine operation.

Scheme 119

Scheme 120

HINT

After confirming DTC P0110, confirm the intake air temperature in the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL" using the hand-held tester or OBD II scan tool.

TEMPERATURE MALFUNCTION

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 121

Scheme 122

Scheme 123

Scheme 124

1. Connect OBD II scan tool or hand-held tester, and read value of intake air temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/INTAKE AIR. CHECK: Read temperature value displayed on the hand-held tester or the OBD II scan tool. OK: Same as the actual intake air temperature and temperature displayed on the hand-held tester or OBD II scan tool. RESULT: TEMPERATURE DISPLAYED - REFERENCE Temperature Displayed Proceed to -40 °C (-40°F) A 140°C (284°F) or more B OK (Same as present temperature) C HINT: If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F). If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more. B : Go to step 4 . C : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). A : Go to next step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the intake temp. sensor connector. Connect sensor wire harness terminals together. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/INTAKE AIR. CHECK: Read temperature value on the OBD II scan tool or the hand-held tester. OK: Temperature value: 140°C (284°F) or more OK : Confirm good connection at sensor. If OK, replace intake air temperature sensor. NG : Go to next step.
3. Check for open in harness or ECM. PREPARATION: Remove the ECM cover. Connect between terminals THA and E2 of the ECM connector. HINT: In take air temp. sensor connector is disconnected. Before checking, do a visual and contact pressure checks for the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/INTAKE AIR. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK : Repair or replace harness or connector. NG : Confirm good connection at ECM. If OK, replace ECM (See Engine Control Module (ECM) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the mass air flow meter connector. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/INTAKE AIR. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK : Replace mass air flow meter. NG : Go to next step.
5. Check for short in harness or ECM. PREPARATION: Remove the ECM cover. Disconnect the E4 connector of the ECM. HINT: Intake air temp. sensor connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/INTAKE AIR. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK : Repair or replace harness or connector. NG : Replace ECM (See Engine Control Module (ECM) ).

A thermistor is built in the Engine Coolant Temperature (ECT) sensor and changes the resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as the Intake Air Temperature (IAT) sensor.

HINT

If the ECM detects the DTC P0115, it operates fail safe function in which the engine coolant temperature is assumed to be 80°C (176°F).

Scheme 125

HINT

After confirming DTC "P0115", use the OBD II scan tool or the hand-held tester to confirm the engine coolant temperature from the DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL.

TEMPERATURE - MALFUNCTION

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 126

Scheme 127

Scheme 128

Scheme 129

1. Connect OBD II scan tool or hand-held tester, and read value of engine coolant temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/COOLANT TEMP. CHECK: Read temperature value displayed on the hand-held tester or the OBD II scan tool. OK: Same value as the actual engine coolant temperature and temperature displayed on the hand-held tester or the OBD II scan tool. RESULT: TEMPERATURE - MALFUNCTION Temperature Displayed Proceed to -40°C (-40°F) A 140°C (284°F) or more B OK (Same as present temperature) C HINT: If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F). If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more. B : Go to step 4 . C : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). A : Go to next step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the engine coolant temp. sensor connector. Connect the sensor wire harness terminals together. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/COOLANT TEMP. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK : Confirm good connection at sensor. If OK, replace engine coolant temperature sensor. NG : Go to next step.
3. Check for open in harness or ECM. PREPARATION: Remove the ECM cover. Connect between terminals THW and E2 of the ECM connector. HINT: Engine coolant temp. sensor connector is disconnected. Before checking, do a visual and contact pressure checks for the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/COOLANT TEMP. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK : Repair or replace harness or connector. NG : Confirm good connection at ECM. If OK, replace ECM (See Engine Control Module (ECM) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the engine coolant temp. sensor connector. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/COOLANT TEMP. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: - 40°C (- 40°F) OK : Replace engine coolant temperature sensor. NG : Go to next step.
5. Check for short in harness or ECM. PREPARATION: Remove the ECM cover. Disconnect the E4 connector of the ECM. HINT: Engine coolant temp. sensor connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL DADA/COOLANT TEMP. CHECK: Read temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK : Repair or replace harness or connector. NG : Replace ECM (See Engine Control Module (ECM) ).

Refer to DTC P0115 on DTC P0115 Engine Coolant Temperature Circuit .

Scheme 130

HINT

1. If DTCs P0115 and P0125 are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC P0115 first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Replace engine coolant temperature sensor.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 131

Scheme 132

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

1. Connect hand-held tester or OBD II scan tool, and read value of throttle valve opening percentage. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ETCS/THROTTLE POS. CHECK: Read its value displayed on the hand-held tester. RESULT: B : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). C : Go to step 4 . A : Go to next step.
2. Check throttle position sensor. Disconnect the T1 throttle position sensor connector. Measure the resistance between the terminals of the throttle position sensor. OK: NG : Replace throttle position sensor. OK : Go to next step.
3. Check for open and short in harness and connector between ECM and throttle position sensor. PREPARATION: Reconnect the throttle position sensor connector. Disconnect the ECM connector. CHECK: Measure the resistance between terminals VC and E2 of ECM connector. Measure the resistance between terminals VTA and E2 of ECM connector. OK: CHECK: Measure the resistance between the terminals of VC and VTA of ECM connector and body ground. OK: Resistance: 10 kohm or higher NG : Repair or replace harness or connector. OK : Replace ECM (See Engine Control Module (ECM) ).
4. Check throttle position sensor. Disconnect the T1 throttle position sensor connector. Measure the resistance between the terminals of the throttle position sensor. OK: NG : Replace throttle position sensor. OK : Go to next step.
5. Check for open and short in harness and connector between ECM and throttle position sensor (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) ).

Scheme 139

Scheme 140

1. Check throttle position sensor. Disconnect the T1 throttle position sensor connector. Measure the resistance between the terminals of the throttle position sensor. OK: NG : Replace throttle position sensor. OK : Go to next step.
2. Check for open and short in harness and connector between ECM and throttle position sensor (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) ).

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides DTC P0121) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT REFERENCE Display (DTC output) Proceed to "P0121" and other DTCs A P0121 B HINT: If any other codes besides P0121 is output, perform the troubleshooting for those DTCs first. B : Replace throttle position sensor. A : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ).

Refer to DTC P0115 on DTC P0115 Engine Coolant Temperature Circuit .

Scheme 141

HINT

1. If DTCs P0115, P0116 and P0125 are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC P0115 first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides DTC P0125) being output. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT REFERENCE Display (DTC output) Proceed to P0125 A P0125 and other DTCs B HINT: If any other codes besides P0125 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check thermostat (See «INSPECTION»(ref-206130-S17671394012005112400000) ). NG : Replace thermostat (See «THERMOSTAT»(ref-206130) ). OK : Go to next step.
3. Check cooling system. CHECK: Check that there is defect cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on. NG : Repair or replace cooling system. OK : Replace engine coolant temperature sensor.

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides DTC P0128) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT REFERENCE Display (DTC output) Proceed to P0128 A P0128 and other DTCs B HINT: If any other codes besides P0128 is output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check cooling system. CHECK: Check that there is a defect in the cooling system which causes over cool, such as abnormal radiator fan operation, modified cooling system and so on. NG : Repair or replace cooling system. OK : Go to next step.
3. Check thermostat (See «INSPECTION»(ref-206130-S17671394012005112400000) ). NG : Replace thermostat. YES : Replace ECM (See Engine Control Module (ECM) ).

The heated oxygen sensor is used to monitor oxygen concentration in the exhaust gas. For optimum catalytic converter operation, the air fuel mixture must be maintained near the ideal "stoichiometric" ratio. The heated oxygen sensor output voltage changes suddenly in the vicinity of the stoichiometric ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).

When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen will be vanished from the exhaust gas. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage, i.e. more than 0.45 V).

Scheme 142

Scheme 143

HINT

1. Sensor 1 refers to the sensor closest to the engine assembly.
2. The output voltage of the heated oxygen sensor and the short-term fuel trim value can be read using the hand-held tester or the OBD II scan tool.

Scheme 144

The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to a stoichiometric ratio. This maximizes the catalytic converter's ability to purify the exhaust gas. The sensor detects oxygen levels in the exhaust gas and sends this signal to the ECM.

The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The heated oxygen sensor has the characteristic whereby its output voltage change suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates output voltage between 0 V and 1.0 V in response to the oxygen concentration in exhaust gas. When the output voltage of the heated oxygen sensor is 0.55 V or more, the ECM judges that the air-fuel ratio is RICH. When it is 0.4 V or less, the ECM judges that the air-fuel ratio is LEAN.

Under normal condition, the output voltage from the heated oxygen sensor alternates RICH and LEAN sides periodically. If the heated oxygen sensor outputs RICH signal (or LEAN signal) constantly, or if the heated oxygen sensor cannot output enough voltage to reach the minimum specification, the ECM interprets this as a malfunction in the heated oxygen sensor and sets a DTC.

Scheme 145

Scheme 146

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

Front HO2S voltage monitor

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

O2S TEST RESULT - OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1)

Scheme 147

Scheme 148

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-206111-S34504961872005112400000) ).
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.

HINT

Hand held tester only

Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).

Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

Heated oxygen sensor reacts in accordance with increase and decrease of injection volume

+25 % --> rich output: More than 0.5 V

12.5 % --> lean output: Less than 0.4 V

Note. There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 149

The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and heated oxygen sensor DTCs will be recorded, and the MIL then comes on.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
3. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

1. Are there any other codes (besides DTC P0130) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to P0130 A "P0130" and other DTCs B HINT: If any other codes besides P0130 is output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check the output voltage of oxygen sensor during idling. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S1. Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. CHECK: Read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.5 V (See the following table). OK : Go to step 9 . NG : Go to next step.
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1: 5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2: 11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG : Replace EFI relay. OK : Go to next step.
5. Check for open and short in harness and connector between ECM and oxygen sensor (bank 1 sensor 1) (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.
6. Check air induction system (See «SFI»(ref-206126) ). CHECK: Check the air induction system for vacuum leaks. NG : Repair or replace induction system. OK : Go to next step.
7. Check fuel pressure (See «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter (See Fuel Pump ). OK : Go to next step.
8. Check injector injection (See Injector ). NG : Replace injector. OK : Replace heated oxygen sensor (bank 1 sensor 1).
9. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step
10. Is there DTC P0130 being output again? NO : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). YES : Replace heated oxygen sensor (bank 1 sensor 1).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) .

Scheme 155

HINT

Sensor 1 refers to the sensor closer to the engine assembly.

Scheme 156

The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to a stoichiometric ratio. This maximizes the catalytic converter's ability to purify the exhaust gas. The sensor detects oxygen levels in the exhaust gas and sends this signal to the ECM.

The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates waveforms of a voltage between 0 V and 1 V in response to the oxygen concentration in exhaust gas. When the output voltage of the heated oxygen sensor is 0.55 V or more, the ECM judges that the air-fuel ratio is RICH. When it is 0.4 V or less, the ECM judges that the air-fuel ratio is LEAN.

The ECM monitors the response feature of the heated oxygen sensor. If the response time of the heated oxygen sensor output status change from RICH to LEAN or vice versa becomes longer, the ECM interprets this as a malfunction in the heated oxygen sensor and sets a DTC.

Scheme 157

Scheme 158

Refer to PRE-CHECK for detailed information.

Front HO2S slow response monitor

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

O2S TEST RESULT

HINT

Hand held tester only

Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished). Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

Perform ACTIVE TEST using the hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

Heated oxygen sensor reacts in accordance with increase and decrease of injection volume

+25 % --> rich output: More than 0.5 V

12.5 % --> lean output: Less than 0.4 V

Note. There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 159

The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and DTC P0133 will be recorded, and the MIL then comes on.

Note. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 160

Scheme 161

Scheme 162

Scheme 163

Scheme 164

1. Are there any other codes (besides DTC P0133) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs using the hand-held tester or the OBD II scan tool. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to P0133 A P0133 and other DTCs B NOTE: If any other codes besides P0133 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check the output voltage of oxygen sensor during idling. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S1. Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. CHECK: Read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates between less than 0.35 V and more than 0.45 V, and period of "t" must be less than 0.6 sec. (See the following graphic). OK : Go to step 9 . NG : Go to next step.
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1: 5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2: 11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG : Replace EFI relay. OK : Go to next step.
5. Check for open and short in harness and connector between ECM and oxygen sensor (bank 1 sensor 1) (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.
6. Check air induction system (See «SFI»(ref-206126) ). CHECK: Check the air induction system vacuum leaks. NG : Repair or replace induction system. OK : Go to next step.
7. Check fuel pressure (See «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter (See Fuel Pump ). OK : Go to next step.
8. Check injector injection (See Injector ). NG : Replace injector. OK : Replace heated oxygen sensor (bank 1 sensor 1).
9. Perform confirmation driving pattern (See «READINESS MONITOR DRIVE PATTERN»(ref-206111-S00328837372005112400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step
10. Is there DTC P0133 being output again? YES : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). NO : Replace heated oxygen sensor (bank 1 sensor 1).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) .

Scheme 165

HINT

After confirming DTC P0134, check the output voltage of the heated oxygen sensor (bank 1 sensor 1) in the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL" using the hand-held tester or the OBD II scan tool. If the output voltage of the heated oxygen sensor is always less than 0.1 V, the sensor circuit may be open or short.

HINT

Hand held tester only

Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).

Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

Heated oxygen sensor reacts in accordance with increase and decrease of injection volume

+25 % --> rich output: More than 0.55 V

12.5 % --> lean output: Less than 0.4 V

Note. There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 166

The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
3. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 167

Scheme 168

Scheme 169

Scheme 170

1. Are there any other codes (besides DTC P0134) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES." CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to P0134 A P0134 and other DTCs B HINT: If any other codes besides P0134 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Connect the OBD II scan tool or hand-held tester and read value for voltage output of oxygen sensor (bank 1 sensor 1). PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S1." Warm up the engine to the normal operating engine coolant temperature above 75°C (169°F). CHECK: Read the output voltage of the heated oxygen sensor when the engine speed is suddenly increased. HINT: Quickly accelerate the engine to 4,000 RPM 3 times by using the accelerator pedal. OK: Heated oxygen sensor outputs a RICH signal (0.45 V or more) at least once. OK : Go to step 12 . NG : Go to next step.
3. Check connection of PCV piping. NG : Repair or replace PCV piping. OK : Go to next step.
4. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1: 5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2: 11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
5. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG : Replace EFI relay. OK : Go to next step.
6. Check for open and short in harness and connector between ECM and oxygen sensor (bank 1 sensor 1) (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.
7. Check whether misfire is occurred or not by monitoring DTC and data list. NG : Perform troubleshooting for misfire (See «DTC P0300 Random/Multiple Cylinder Misfire Detected, DTC P0301 Cylinder 1 Misfire Detected, DTC P0302 Cylinder 2 Misfire Detected, DTC P0303 Cylinder 3 Misfire Detected, DTC P0304 Cylinder 4 Misfire Detected»(ref-206111-S31591174042005112400000) ). OK : Go to next step.
8. Check air induction system (See «SFI»(ref-206126) ). CHECK: Check the air induction system for vacuum leaks. NG : Repair or replace induction system. OK : Go to next step.
9. Check fuel pressure (See «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter (See Fuel Pump ). OK : Go to next step.
10. Check injector injection (See Injector ). NG : Replace injector. OK : Go to next step.
11. Check gas leakage on exhaust system. NG : Repair or replace exhaust gas leakage point. OK : Replace heated oxygen sensor (bank 1 sensor 1).
12. Perform confirmation driving pattern (See «READINESS MONITOR DRIVE PATTERN»(ref-206111-S00328837372005112400000) ). HINT: Clear all DTCs prior to performing the confirmation pattern. Go
13. Is there DTC P0134 being output again? YES : Replace ECM (See Engine Control Module (ECM) ). NO : Go to next step.
14. Did vehicle run out of fuel in the past? NO : Check for intermittent problems. YES : DTC P0134 is caused by running out of fuel.

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) .

Scheme 171

HINT

Sensor 2 refers to the sensor farther away from the engine assembly.

Refer to PRE-CHECK for detailed information.

Rear HO2S voltage monitor

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

DESCRIPTION OF TEST DATA

Rear HO2S element monitor

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

REAR HO2S ELEMENT MONITOR

HINT

Hand held tester only

Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).

Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

Heated oxygen sensor reacts in accordance with increase and decrease of injection volume

+25 % --> rich output: More than 0.5 V

12.5 % --> lean output: Less than 0.4 V

Note. There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 172

The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 173

Scheme 174

Scheme 175

Scheme 176

1. Are there any other codes (besides DTC P0136) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES." CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to P0136 A P0136 and other DTCs B HINT: If any other codes besides P0136 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check output voltage of oxygen sensor. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S1." After warming up the engine, run the engine at 2,500 RPM for 3 minutes. CHECK: Read the output voltage of the heated oxygen sensor (sensor 2) when the engine RPM is suddenly increased. HINT: Quickly accelerate the engine to 4,000 RPM 3 times by using the accelerator pedal. OK: The output voltage of heated oxygen sensor (sensor 2): Alternates from 0.4 V or less to 0.5 V or more. OK : Go to step 6 . NG : Go to next step.
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1: 5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2: 11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: SPECIFIED CONDITION Tester Connection Specified Condition 1 - 2 Continuity 3 - 5 No continuity Continuity (Apply battery voltage to terminals 1 and 2) NG : Replace EFI relay. OK : Go to next step.
5. Check for open and short in harness and connector between ECM and oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace heated oxygen sensor.
6. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step
7. Is there DTC P0136 being output again? No : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). Yes : Replace heated oxygen sensor.

The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim includes the short-term fuel trim and the long-term fuel trim.

The short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at stoichiometric air-fuel ratio. The signal from the heated oxygen sensor indicates whether the air-fuel ratio is RICH or LEAN compared to the stoichiometric air-fuel ratio. This variance triggers a reduction in the fuel volume if the air-fuel ratio is RICH, and an increase in the fuel volume if it is LEAN.

The long-term fuel trim is the overall fuel compensation carried out in long-term to compensate for a continual deviation of the short-term fuel trim from the central value, due to individual engine differences, wear overtime and changes in the operating environment.

If both the short-term fuel trim and the long-term fuel trim are LEAN or RICH beyond a certain value, it is detected as a malfunction and the MIL is illuminated.

Scheme 177

HINT

1. When DTC P0171 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 is recorded, the actual air-fuel ratio is on the RICH side.
2. If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 may be recorded. The MIL then comes on.
3. If the total of the short-term fuel trim value and long-term fuel trim value is within +/- 35 % (engine coolant temperature is more than 75 °C (167°F)), the system is functioning normally.

Scheme 178

Under closed-loop fuel control, fuel injection amount that deviates from the ECM's estimated fuel amount will cause a change in the long-term fuel trim compensation value. This long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. And the deviation from a simulated fuel injection amount by the ECM affects a smoothed fuel trim learning value. The smoothed fuel trim learning value is the combination of smoothed short term fuel trim (fuel feedback compensation value) and smoothed long term fuel trim (learning value of the air-fuel ratio). When the smoothed fuel trim learning value exceeds the DTC threshold, the ECM interprets this as a fault in the fuel system and sets a DTC.

Example

If the smoothed fuel trim learning value is more than 1.35 or less than 0.65. The ECM interprets this as a malfunction in the fuel system.

Scheme 179

Scheme 180

HINT

Hand held tester only

Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).

Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

Heated oxygen sensor reacts in accordance with increase and decrease of injection volume

+25 % --> rich output: More than 0.5 V

12.5 % --> lean output: Less than 0.4 V

Note. There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 181

The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors.

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.
3. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

Scheme 187

Scheme 188

Scheme 189

Scheme 190

Scheme 191

1. Check air induction system (See «SFI»(ref-206126) ). CHECK: Check the air induction system for vacuum leaks. NG : Repair or replace air induction system. OK : Go to next step.
2. Check connection of PCV piping. NG : Repair or replace PCV piping. OK : Go to next step.
3. Check injector injection (See Injector ). NG : Replace injector. OK : Go to next step.
4. Check mass air flow meter. PREPARATION: Remove the mass air flow sensor. CHECK: Inspect output voltage. Apply battery voltage terminals +B and E2G. Connect the positive (+) tester prove to terminal VG, and negative (-) tester prove to terminal E2G. Blow air into the mass air flow sensor, and check that the voltage fluctuates. Resistance inspection. Measure the resistance between the terminals of the intake air temperature sensor. OK: NG : Replace mass air flow meter. OK : Go to next step.
5. Check engine coolant temperature sensor. PREPARATION: Remove the engine coolant temperature sensor. CHECK: Measure the resistance between the terminals of the engine coolant temperature sensor. OK: NOTE: If you checking the engine coolant temperature sensor in water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test. NG : Replace engine coolant temperature sensor. OK : Go to next step.
6. Check for spark and ignition (See «ON-VEHICLE INSPECTION»(ref-206133-S19742093492005112400000) ). NG : Repair or replace. OK : Go to next step.
7. Check fuel pressure (See «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter (See Fuel Pump ). OK : Go to next step.
8. Check gas leakage on exhaust system. NG : Repair or replace exhaust gas leakage point. OK : Go to next step.
9. Check the output voltage of oxygen sensor during idling. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/O2S B1S1." Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. CHECK: Read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.5 V (See the following figure). OK : Go to step 17 . NG : Go to next step.
10. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the heated oxygen sensor connector. CHECK: Measure resistance between the terminals HT and +B of the heated oxygen sensor. Resistance: Bank 1 Sensor 1: 5 to 10 ohm (20 °C (68 °F)) Bank 1 Sensor 2: 11 to 16 ohm (20 °C (68 °F)) NG : Replace heated oxygen sensor. OK : Go to next step.
11. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG : Replace EFI relay. OK : Go to next step.
12. Check for open and short in harness and connector between ECM and oxygen sensor (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.
13. Replace heated oxygen sensor. Go to next step
14. Perform confirmation driving pattern. Disconnect the battery terminal and wait for a minute (clear learning value of the air fuel ratio). (*1) Connect the hand-held tester to the DLC3. (*1) Switch the hand-held tester from the normal mode to the check mode (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). (*1) Start the engine and let it idle until engine coolant temperature is 75 °C (167°F) or more. (*2) Drive the vehicle at 19 mph (30 km/h) or more for 3 minutes or more. (*3) Let the engine idle for approx. 2 minutes. (*4) Perform steps (e) and (g) at least 3 times. HINT: If a malfunction exists, the MIL will be illuminated during step (f). NOTE: If the conditions in this test are not strictly followed, detecting a malfunction may be difficult. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (e) to (f), and then do step (f) again. Go to next step
15. Is there DTC P0171 or P0172 being output again? YES : Replace ECM (See Engine Control Module (ECM) ) and perform confirmation driving pattern (Refer to step 14 ). NO : Go to next step.
16. Confirm if vehicle has run out of fuel in past. NO : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). YES : DTC P0171 or P0172 is caused by running out of fuel.
17. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). Go to next step
18. Is there DTC P0171 or P0172 being output again? No : Go to step 22 . YES : Go to next step.
19. Replace heated oxygen sensor. Go to next step
20. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). Go to next step
21. Is there DTC P0171 or P0172 being output again? B : Replace ECM (See Engine Control Module (ECM) ) and perform confirmation driving pattern (Refer to step 14). A : Go to next step.
22. Confirm if vehicle has run out of fuel in past. NO : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). YES : DTC P0171 or P0172 is caused by running out of fuel.

When a misfire occurs in the engine, hydrocarbons (HC) enter the exhaust in high concentrations. If this HC concentration is high enough, there could be an increase in exhaust emission levels. High concentrations of HC can also cause to temperature of the catalyst to increase, possibly damaging the catalyst. To prevent increases in emissions and limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the catalyst reaches a point of thermal degradation, the ECM will blink the MIL. For monitoring a misfire, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. The misfire is counted when crankshaft rotation speed variations exceed threshold values.

If the misfiring rate exceeds the threshold value and could cause emissions deterioration, the ECM illuminates the MIL.

Scheme 192

HINT

When codes for a misfiring cylinder are recorded repeatedly but no random misfire code is recorded, it indicates that the misfires have been detected and recorded at different times.

Reference: Inspection using oscilloscope

With the engine idling, check the waveform between terminals #10 to #40 and E01 of the ECM connectors.

HINT

The correct waveform is as shown.

Scheme 193

Scheme 194

The ECM illuminates the MIL (2 trip detection logic) if

The ECM will illuminate the MIL when the percent misfire exceeds the specified limit per 1,000 engine revolutions. One occurrence of excessive misfire during engine start will set the MIL. Four occurrences are required to set the MIL 1,000 revolutions after engine start.

The ECM blinks the MIL (MIL blinks immediately) if

1. Within 200 engine revolutions at a high RPM, the threshold for "percent of misfire causing catalyst damage" is reached 1 time.
2. Within 200 engine revolutions at a normal RPM, the threshold for "percent of misfire causing catalyst damage" is reached 3 times.

Scheme 195

Scheme 196

Scheme 197

Scheme 198

HINT

1. If DTCs besides misfire DTCs are memorized simultaneously, troubleshoot the non-misfire DTCs first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
3. If the misfire does not occur when the vehicle is brought to the workshop, the misfire can be confirmed by reproducing the condition of the freeze frame data. Also, after finishing the repair, confirm that there is no misfire (See confirmation driving pattern).
4. On 6 and 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (P0301 to P0308). If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area, only code P0300 will be stored. When only a general misfire fault code like P0300 is stored
5. Erase the general misfire fault code from the hand-held tester or OBD II scan tool.
6. Start the engine and drive the confirmation pattern (See «READINESS MONITOR DRIVE PATTERN»(ref-206111-S00328837372005112400000) ).
7. Read the value of the misfire ratio for each cylinder. Or read the DTC.
8. Perform repairs on the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC.
9. After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs.
10. When either of SHORT FT #1, LONG FT #1 in the freeze frame data is over the range of +/-20 %, there is a possibility that the air-fuel ratio is becoming to RICH (-20 % or less) or LEAN (+20 % or more).
11. When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility of misfire only during engine warm-up.
12. If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2) improper fuel is being used, and 3) the ignition plug is contaminated.
13. Be sure to check the value on the misfire counter after the repair.

Scheme 199

Scheme 200

Scheme 201

Scheme 202

1. Are there any other codes (besides DTC P0300, P0301, P0302, P0303 or P0304) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to "P0300, P0301, P0302, P0303 and/or P0304" A "P0300, P0301, P0302, P0303 and/or P0304" and other DTCs B HINT: If any other codes besides P0300, P0301, P0302, P0303 or P0304 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check harness, connector and vacuum hose in engine room. CHECK: Check the connection conditions of the wire harness and connector. Check for the disconnection, piping and break of the vacuum hose. NG : Repair or replace, then confirm that there is no misfire (See confirmation driving pattern). OK : Go to next step.
3. Check connection of PCV piping. NG : Repair or replace PCV piping. OK : Go to next step.
4. Connect hand-held tester, and read the number of misfire. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Start the engine. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/CYL#1 to CYL#4. CHECK: Read the number of misfire on the hand-held tester or the OBD II scan tool. HINT: When a misfire is not reproduced, be sure to branch below based on the stored DTC. RESULT: HIGH MISFIRE RATE CYLINDER High Misfire Rate Cylinder Proceed to 1 or 2 cylinders A More than 3 cylinders B B : Go to step 15 . A : Go to next step.
5. Check spark plug and spark of misfiring cylinder. PREPARATION: Disconnect the ignition coil assembly. Remove the spark plug. CHECK: Check for carbon deposits on electrode. Check the spark plug type (See «ON-VEHICLE INSPECTION»(ref-206133-S19742093492005112400000) ). Check electrode gap. OK: (b) No large carbon deposit present. Not wet with gasoline or oil. (c) Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.) NOTE: If adjusting the gap of a new spark plug, bend only the base/ground" electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug. PREPARATION: Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground spark plug. CHECK: Check if spark occurs while engine is being cracked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark jumps across electrode gap. OK : Go to step 8 . NG : Go to next step.
6. Change normal spark plug and check spark of misfiring cylinder. PREPARATION: Change to the normal spark plug. Remove the spark plug that may be faulty from the ignition coil assembly. Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark jumps across electrode gap. OK : Replace spark plug. NG : Go to next step.
7. Check for open and short in harness and connector between ignition coil and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). OK : Replace ignition coil with igniter, then confirm that there is no misfire. NG : Repair or replace harness or connector.
8. Check voltage of ECM terminal for injector of failed cylinder. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between applicable terminal of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Go to step 11 . NG : Go to next step.
9. Check resistance of injector of misfiring cylinder (See Injector ). NG : Replace injector. OK : Go to next step.
10. Check for open and short in harness and connector between ignition switch and injector, injector and ECM of misfiring cylinder (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. Check injector injection and volume of misfiring cylinder (See Injector ). NG : Replace injector. OK : Go to next step.
12. Check compression pressure of misfiring cylinder (See «COMPRESSION»(ref-163200-S05773778892005020100000) ). NG : Repair or replace. OK : Go to next step.
13. Check valve clearance of misfiring cylinder (See «VALVE CLEARANCE»(ref-163200-S14004949002005020100000) ). NG : Adjust valve clearance. OK : Go to next step.
14. Check result of step 4 switch step by number of misfire cylinder. HIGH MISFIRE RATE CYLINDER High misfire rate cylinder Proceed to 1 or 2 cylinders A More than 3 cylinders B B : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). A : Go to next step.
15. Check valve timing (Check for loose or a jumped tooth of the timing chain) (See «TIMING CHAIN»(ref-163200-S28462148812005020100000) ). NG : Adjust valve timing. OK : Go to next step.
16. Check fuel pressure (See «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter (See Fuel Pump ). OK : Go to next step.
17. Check mass air flow meter. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. CHECK: Check the intake air temperature. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR. Read its value displayed on the hand-held tester or the OBD II scan tool. OK: Equivalent to ambient temperature Check the air flow rate. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF. Read its value displayed on the hand-held tester or the OBD II scan tool. OK: AIR FLOW RATE Condition Air flow rate (gm/s) Ignition switch ON (do not start engine) 0 Idling 4 to 6 Running without load (2,500 RPM) 13 to 20 From idling to quickly accelerating Air flow rate fluctuates NG : Repair mass air flow meter. OK : Go to next step.
18. Check engine coolant temperature sensor. Remove the engine coolant temperature sensor. Measure the resistance between the terminals of the engine coolant temperature sensor. Standard: NOTE: If you check the engine coolant temperature sensor in water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test. NG : Replace engine coolant temperature sensor. OK : Go to next step.
19. Check result of step 4 switch step by number of misfire cylinder. HIGH MISFIRE RATE CYLINDER High misfire rate cylinder Proceed to 1 or 2 cylinders A More than 3 cylinders B B : Go to step 5 . A : Check intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ).

The knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.

Scheme 203

HINT

If the ECM detects above diagnosis conditions, it operates the fail safe function in which the corrective retard angle value is set to the maximum value.

Reference: INSPECTION USING OSCILLOSCOPE

Scheme 204

1. With the engine racing (4,000 RPM), measure between terminal KNK of the ECM connector and body ground. HINT: The correct waveforms are as shown.
2. Spread the time on the horizontal axis, and confirm that period of the wave is 80 mu sec. (Normal mode vibration frequency of knock sensor: 12.5 kHz

HINT

If normal mode vibration frequency is not 7.6 kHz the sensor is malfunctioning.

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 205

1. Check continuity between terminal KNK1 of ECM connector and body ground. PREPARATION: Remove the ECM cover. Disconnect the E5 connector of the ECM. CHECK: Measure resistance between terminal KNK1 of the ECM connector and body ground. OK: Resistance: 10 kohm or higher OK : Go to step 3 . NG : Go to next step.
2. Check knock sensor 1 (See Knock Sensor ). NG : Replace knock sensor 1. OK : Go to next step.
3. Check for open and short in harness and connector between ECM and knock sensor 1 (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.
4. Does malfunction disappear when a good knock sensor 1 is installed? YES : Replace knock sensor 1. NO : Replace ECM (See Engine Control Module (ECM) ).

The crankshaft position sensor (NE signal) consists of a magnet, iron core and pickup coil.

The NE signal plate (crankshaft position sensor plate) has 34 teeth and is installed on the crankshaft. The NE signal sensor generates 34 signals for each engine revolution. This sensor monitors a plate (timing rotor) located on the crankshaft timing pulley and is used by the ECM to detect crankshaft angle and engine speed (RPM/NE). As the crankshaft timing pulley rotates through an engine revolution, this sensor communicates the rotation of the NE signal plate as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection time and ignition timing.

Scheme 206

Reference: Inspection by using the oscilloscope.

HINT

The correct waveform is (Scheme 207)

ITEM AND CONTENT CHART

Scheme 207

HINT

1. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/ENGINE SPD.
3. The engine speed can be confirmed in DATA LIST using the hand-held tester or OBD II scan tool. If there is no NE signals from the crankshaft position sensor despite the engine revolution, the engine speed will be indicated as zero. If voltage output of the crankshaft position sensor is insufficient, the engine speed will be indicated as lower RPM (than the actual RPM).

Scheme 208

Scheme 209

1. Check resistance of crankshaft position sensor. PREPARATION: Disconnect the crankshaft position sensor connector. CHECK: Measure the resistance between the terminals of the crankshaft position sensor connector. OK: NOTE: "Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG : Replace crankshaft position sensor. OK : Go to next step.
2. Check for open and short in harness and connector between ECM and crankshaft position sensor (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.
3. Inspect sensor installation. CHECK: Check the crankshaft position sensor installation. NG : Tighten the sensor. OK : Go to next step.
4. Check teeth of crankshaft timing pulley. PREPARATION: Remove the crankshaft angle sensor plate (See «TIMING CHAIN»(ref-163200-S28462148812005020100000) ). CHECK: Check the teeth of sensor plate. NG : Replace crankshaft timing pulley. OK : Replace ECM (See Engine Control Module (ECM) ).

The camshaft position sensor (G2 signal) consists of a magnet, iron core and pickup coil.

The G22+ signal plate has 3 tooth on its outer circumference and is installed on the camshaft timing pulley.

When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil changes, causing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.

The NE+ signal plate (crankshaft timing pulley) has 34 teeth and is installed to the crankshaft. The NE+ signal sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft angle and the engine revolution based on the NE+ signals, and the cylinder and the angle of the VVT based on the combination of the G2 and NE+ signals.

Scheme 210

Reference: Inspection by using the oscilloscope.

HINT

The correct waveform is (Scheme 211)

ITEM AND CONTENTS CHART

Scheme 211

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 212

Scheme 213

1. Check resistance of camshaft position sensor (Signal generator). CHECK: Measure the resistance between the terminals of camshaft position sensor connector. Standard: NOTE: "Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG : Replace camshaft position sensor. OK : Go to next step.
2. Check for open and short in harness and connector between ECM and camshaft position sensor (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.
3. Inspect sensor installation. CHECK: Check the camshaft position sensor installation. NG : Tighten the sensor. OK : Go to next step.
4. Inspect camshaft (See «INSPECTION»(ref-163200-S10952047122005020100000) ). NG : Replace camshaft. OK : Replace ECM (See Engine Control Module (ECM) ).

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 214

Scheme 215

Scheme 216

Scheme 217

1. Check spark plug and spark of misfiring cylinder (See «ON-VEHICLE INSPECTION»(ref-206133-S19742093492005112400000) ). NG : Go to step 4 . OK : Go to next step.
2. Check for open and short in harness and connector in IGF signal circuit between ECM and ignition coil with igniter (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.
3. Check voltage between terminals IGF of ECM connector and body ground. PREPARATION: Remove the ECM cover. Disconnect the ignition coil with igniter connector. Turn the ignition switch ON. CHECK: Measure voltage between terminals IGF of the ECM connector and body ground when engine is cranked. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (See Engine Control Module (ECM) ). OK : Replace ignition coil with igniter.
4. Check for open and short in harness and connector in IGT signal circuit between ECM and ignition coil with igniter (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.
5. Check voltage between terminals IGT1 to 4 of ECM connector and body ground. PREPARATION: Remove the ECM cover. CHECK: Measure voltage between terminals IGT1 to 4 of the ECM connector and body ground when engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
6. Check voltage between terminals IGT1 to 4 of ECM connector and body ground. PREPARATION: Disconnect the ignition coil with igniter connector. CHECK: Measure voltage between terminals IGT1 to 4 of the ECM connector and body ground when engine is cranked. OK: Voltage: 4.5 V or more NG : Replace ECM (See Engine Control Module (ECM) ). OK : Go to next step.
7. Check ignition coil with igniter power source circuit. PREPARATION: Disconnect the ignition coil with igniter connector. CHECK: Measure voltage between terminal 1 of ignition coil with igniter connector and body ground, when ignition switch is turned to "ON" and "START" position. OK: Voltage: 9 to 14 V NG : Repair ignition coil with igniter. OK : Go to next step.
8. Check for open and short in harness and connector between ignition switch and ignition coil with igniter (See Engine Control Module (ECM) ). NG : Repair or replace harness or connector. OK : Replace ignition coil with igniter.

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides DTC P0420) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES." CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC output) Proceed to P0420 A P0420 and other DTCs B HINT: If any other codes besides P0420 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check gas leakage on exhaust system. NG : Repair or replace exhaust gas leakage point. OK : Go to next step.
3. Check oxygen sensor (bank 1 sensor 1) (See «DTC P0031 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1), DTC P0032 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1)»(ref-206111-S09242154772005112400000) , DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2), DT). HINT: Refer to the hint following the end of this list. NG : Replace heated oxygen sensor. OK : Go to next step.
4. Check oxygen sensor (bank 1 sensor 2) (See «DTC P0031 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1), DTC P0032 Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1), DTC P0037 Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2), DT)»(ref-206111-S09242154772005112400000) . HINT: Refer to the hint following the end of this list. NG : Replace heated oxygen sensor. OK : Replace three-way catalytic converter.

HINT

Hand held tester only

1. The following procedure enables the technician to identify a trouble area if malfunction in both front and rear heated oxygen sensors other than the catalyst converter, or the malfunction that indicates the actual air-fuel ratio extremely RICH or LEAN.
2. Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished).

Perform ACTIVE TEST using hand-held tester (A/F CONTROL).

HINT

"A/F CONTROL" is ACTIVE TEST which changes the injection volume -12.5 % or +25 %.

Scheme 218

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine by running the engine speed at 2,500 RPM for approximately 90 seconds.
4. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/A/F CONTROL".
5. Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button). RESULT: Heated oxygen sensor reacts in accordance with increase and decrease of injection volume +25 % --> rich output: More than 0.5 V, -12.5 % --> lean output: Less than 0.4 V NOTE: There is a delay of few seconds in the sensor 1 (front sensor) output, and there is about 20 seconds delay at maximum in the sensor 2 (rear sensor). The following of A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the heated oxygen sensors. For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button. NOTE: If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and DTCs P0133 and/or P0153 will be recorded, and the MIL then comes on.

The vapor pressure sensor, canister closed valve (CCV), pressure switching valve are used to detect abnormalities in the evaporative emission control system.

The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.

DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 219) below, or when there is a malfunction in either the EVAP VSV, the pressure switching valve, or in the vapor pressure sensor itself.

Scheme 219

Scheme 220

Scheme 221

HINT

Typical DTC output of each trouble part

Scheme 222

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV or pressure switching valve), P0451, P0452 or P0453 (See «DTC P0451 Evaporative Emission Control System Pressure Sensor/Switch Range/Performance»(ref-206111-S21495613242005112400000) ) is output with DTC P0442 or P0456 (See «DTC P0442 Evaporative Emission Control System Leak Detected (Small Leak), DTC P0456 Evaporative Emission Control System Leak Detected (Very Small Leak)»(ref-206111-S26447565392005112400000) ), first troubleshoot DTC P0441, P0446, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
3. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 223

Scheme 224

Scheme 225

Scheme 226

Scheme 227

Scheme 228

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 item "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, hole, damage and blockage. NG : Repair or replace vacuum hoses. OK : Go to next step.
7. Check operation of EVAP VSV (See VSV For Evaporative Emission (EVAP) ). 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) ).
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 item "CAN CTRL VSV/ALL" in the ACTIVE TEST and operate CAN CTRL VSV (Press the right or left button). CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV 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, hole damage and blockage. NG : Repair or replace vacuum hoses. OK : Go to next step.
11. Check operation of CCV (See VSV For Canister Closed Valve (CCV) ). 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) ).
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 item "TANK BYPASS VSV/ALL" in the ACTIVE TEST and operate TANK BYPASS VSV (Press the right or left button). Check the VSV operation when it is operated by the hand-held tester. CHECK: Check the VSV operation when it is operated by the hand-held tester. 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 16 . NG : Go to next step.
14. Check operation of pressure switching valve (See VSV For Pressure Switching Valve ). 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) ).
16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG : Repair or replace evaporative emission leak part. OK : Go to next step.
17. Check vacuum hoses between vapor pressure sensor and fuel tank, 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, hole and damage. 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 «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-206125-S22456243822006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. 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) ). 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 connectors at 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: Vacuum applied to 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) ).
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, hole and damage. NG : Repair or replace charcoal canister. OK : Replace ECM (See Engine Control Module (ECM) ).

Scheme 229

Scheme 230

Scheme 231

Scheme 232

Scheme 233

Scheme 234

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 leakage point. 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, hole and damage. NG: Repair or connect VSV or sensor connector. 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 «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-206125-S22456243822006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace hose and tube. OK: Go to next step.
8. Check vacuum hoses ((8), (9), (10) and (11) in (Scheme 219) 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, hole, damage and blockage. 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 or sensor connector. OK: Go to next step.
10. Check charcoal canister for cracks, hole and damage. 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) ). 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 connectors at 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: Vacuum applied to 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) ).
14. Check EVAP VSV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check VSV function. Connect between terminal EVP1 of the ECM connector and body ground (VSV ON). Disconnect between terminal EVP1 of the ECM connector and body ground (VSV 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 step 17. NG: Go to next step.
15. Check operation of EVAP VSV (See VSV For Evaporative Emission (EVAP) ). 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) ).
17. Check CCV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal CCV of the ECM connector and body ground (VSV ON). Disconnect between terminal CCV of the ECM connector and body ground (VSV OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV 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) ). 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) ).
20. Check pressure switching valve. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal TBP of the ECM connector and body ground (VSV ON). Disconnect between terminal TBP of the ECM connector and body ground (VSV 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 23. NG: Go to next step.
21. Check operation of pressure switching valve (See VSV For Pressure Switching Valve ). 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) ).
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.

The vapor pressure sensor and the canister closed valve (CCV) are used to detect abnormalities in the evaporative emission control system. The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.

DTC P0442 or P0456 is recorded by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 235) below, or when the vapor pressure sensor malfunctions.

Scheme 235

Scheme 236

Scheme 237

HINT

Typical DTC output of each trouble part.

Scheme 238

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. If DTC P0441 (Purge Flow), P0446 (CCV), P0451 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446 or P0451 first. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
4. If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 239

Scheme 240

1. 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) ). OK : Go to next step.
2. 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 connectors. 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. Check the vapor pressure sensor output waveform using a hand-held tester. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Voltage: 2.9 to 3.7 V Voltage: 0.5 V or less A consecutive waveform presents. OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). NG : Go to next step.
3. 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 vapor pressure sensor.

The No. 1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.

Scheme 241

Scheme 242

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 243

Scheme 244

1. Check operation of speedometer. CHECK: Drive the vehicle and check if the operation of the speedometer in the combination meter is normal. HINT: The vehicle speed sensor is operating normally if the speedometer display is normal. NG: Check speedometer circuit. See combination meter troubleshooting (See «TROUBLESHOOTING»(ref-206191-S24736682472005112400000) ). OK: Go to next step.
2. Check voltage between terminal SPD of ECM connector and body ground. PREPARATION: Remove the ECM cover. Shift the shift lever to neutral. Jack up one of the front wheels. Turn the ignition switch ON. CHECK: Measure voltage between terminal SPD of ECM connector and body ground when the wheel is turned slowly. OK: Voltage is generated intermittently. HINT: The output voltage should fluctuate up and down similarly to the diagram in (Scheme 244) when the wheel is turned slowly. NG: Repair or replace harness or connector. OK: Replace ECM (See Engine Control Module (ECM) ).

The rotary solenoid type idle air control (IAC) valve is located under the throttle body and intake air bypassing the throttle valve flows into the IAC valve through the passage.

In this way, the intake air volume bypassing the throttle valve is regulated, controls the engine speed.

The ECM operates the IAC valve only to perform idle-up and provide feedback for the target idling speed.

Scheme 245

Scheme 246

Scheme 247

The idle speed is controlled by the Electronic Throttle Control System (ETCS).

The ETCS is composed of the throttle motor which operates the throttle valve, and the throttle position sensor, which detects the opening angle of the throttle valve.

The ECM controls the throttle motor to provide the proper throttle valve opening angle to obtain the target idle speed.

The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. The ECM concludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than the specified amount, or 2) a learned value of the idle speed control remains at the maximum or minimum five times or more during a drive cycle the ECM will turn on the MIL and set a DTC.

Example

If the RPM difference between the targeted and actual idle engine RPM exceeds 200 RPM (*1) with the vehicle stopped in an idle, and this occurs 5 times, or if the learned value angle of the IAC remains at its maximum or minimum angle for 5 seconds, P0505 is detected.

P0511 is detected as an open/short circuit in the IAC if the rate of duty signal input to the IAC valve has stuck at 0 or 100%.

HINT

*1: RPM threshold varies with engine load.

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HINT

1. When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc., DTC P505 will possibly be detected.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 253

1. Are there any other codes (besides DTC P0505 and P0511) 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/DATA LIST/ALL/MAF. CHECK: Read the DTCs. RESULT: DISPLAY DTC OUTPUT Display (DTC Output) Proceed to P0505 and P0511 A P0505, P0511 and other DTCs B HINT: If any other codes besides P0505 and P0511 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206111-S11994774182005112400000) ). A : Go to next step.
2. Check connection of PCV piping. NG : Repair or replace PCV piping. OK : Go to next step.
3. Check air induction system. CHECK: Check the air induction system vacuum leaks. NG : Repair or replace air induction system. OK : Go to next step.
4. Check engine idle speed. PREPARATION: Warm up the engine to the normal operating temperature. Switch off all the accessories. Switch off the A/C. Shift the lever into the neutral position. Connect the hand-held tester to the DLC3. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/ISC DUTY RATIO. CHECK: Check that the engine RPM varies when changing the ISC duty ratio. OK: Engine PRM fluctuates up and down in response to the ISC duty ratio variation. OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). NG : Go to next step.
5. Check A/C signal circuit. NG : Repair or replace A/C signal circuit. OK : Go to next step.
6. Check blockage of IAC valve and passage to bypass throttle valve. NG : Replace IAC valve. OK : Go to next step.
7. Check voltage between terminals VISC and GND of IAC valve connector. PREPARATION: Disconnect the IAC valve connector. Turn the ignition switch ON. CHECK: Measure the voltage between the terminals VISC and IAC of IAC valve connector. OK: Voltage: 9 to 14 V NG : Repair or replace harness or connector. OK : Go to next step.
8. Check for open and short in harness and connector between IAC valve and ECM (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.
9. Check IAC valve (See Idle Air Control (IAC) Valve ). NG : Replace IAC valve. OK : Replace ECM (See Engine Control Module (ECM) ).

Scheme 254

1. Check connection of PCV piping. NG : Repair or replace PCV piping. OK : Go to next step.
2. Check air induction system. CHECK: Check the air induction system vacuum leaks. NG : Repair or replace air induction system. OK : Go to next step.
3. Check A/C signal circuit. NG : Repair or replace A/C signal circuit. OK : Go to next step.
4. Check blockage of IAC valve and passage to bypass throttle valve. NG : Replace IAC valve. OK : Go to next step.
5. Check voltage between terminals VISC and GND of IAC valve connector. PREPARATION: Disconnect the IAC valve connector. Turn the ignition switch ON. CHECK: Measure the voltage between the terminals VISC and IAC of IAC valve connector. OK: Voltage: 9 to 14 V NG : Repair or replace harness or connector. OK : Go to next step.
6. Check for open and short in harness and connector between IAC valve and ECM (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.
7. Check IAC valve (See Idle Air Control (IAC) Valve ). NG : Replace IAC valve. OK : Replace ECM (See Engine Control Module (ECM) ).

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

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1. Check EFI fuse. PREPARATION: Remove the EFI fuse from the engine room J/B. CHECK: Check continuity of EFI fuse. OK: Continuity NG : Check for short in all the harness and components connected to EFI fuse. OK : Go to next step.
2. Check voltage between terminal BATT of ECM connector and body ground. PREPARATION: Remove the ECM cover. CHECK: Measure voltage between terminal BATT of the ECM connector and body ground. OK: Voltage 9 to 14 V OK : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). NG : Go to next step.
3. Check for open and short in harness and connector between ECM and EFI fuse, EFI fuse and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Check and replace engine room J/B.

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 257

1. Check STA signal. 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/DATA LIST/ALL/STARTER SIG. CHECK: Read the STA signal on the hand-held tester while the starter is operating. OK: CHECK STA SIGNAL Ignition Switch Position ON START STA Signal OFF ON OK : Go to step 5 . NG : Go to next step.
2. Check park/neutral position switch or clutch start switch. Inspect the park/neutral position switch (A/T) (See «CIRCUIT INSPECTION»(ref-206116-S40118064442005112400000) ). Inspect the clutch start switch (M/T) (See «INSPECTION»(ref-206136-S00720776662005112400000) ). NG : Replace park/neutral position switch or clutch start switch. Go to next step 5 after the replacement. OK : Go to next step.
3. Check ignition switch. Check continuity between the connector terminals shown in the chart below. CONNECTOR TERMINAL RESISTANCE Switch Terminal No. Resistance LOCK All Terminal to Terminal 10 kohm or higher ACC 2 - 3 Below 1 ohm ON 2 - 3 - 4 6 - 7 Below 1 ohm START 1 - 2 - 4 6 - 7 - 8 Below 1 ohm NG : Replace ignition switch. Go to next step 5 after the replacement. OK : Go to next step.
4. Check STA signal. 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/DATA LIST/ALL/STARTER SIG. CHECK: Read the STA signal on the hand-held tester while the starter is operating. OK: CHECK STA SIGNAL Ignition Switch Position ON START STA Signal OFF ON NG : Repair or replace harness or connector. OK : Go to next step.
5. Check DTC reoccur PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Clear DTC (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ) Enter the following menus: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CLEAR CODE and press YES. Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check the DTC reoccur. RESULT: DISPLAY DTC OUTPUT Display (DTC Output) Proceed to P0617 A No DTC output B A : Replace ECM (See Engine Control Module (ECM) ) B : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) )

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1. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminal STA of the ECM connector and body ground during the engine cranking. OK: Voltage: 0 V (Ignition switch ON) 6 V or more (Engine cranking) OK : Go to step 5 . NG : Go to next step.
2. Check park/neutral position switch or clutch start switch. Inspect the park/neutral position switch (A/T) (See «CIRCUIT INSPECTION»(ref-206116-S40118064442005112400000) ). Inspect the clutch start switch (M/T) (See «INSPECTION»(ref-206136-S00720776662005112400000) ). NG : Replace park/neutral position switch or clutch start switch. Go to next step 5 after the replacement. OK : Go to next step.
3. Check ignition switch. Check continuity between the connector terminals shown in the chart below. CONNECTOR TERMINAL RESISTANCE Switch Terminal No. Resistance LOCK All Terminal to Terminal 1 Mohm or more ACC 2 - 3 1 ohm or less ON 2 - 3 - 4 6 - 7 1 ohm or less START 1 - 2 - 4 6 - 7 - 8 1 ohm or less NG : Replace ignition switch. Go to next step 5 after the replacement. OK : Go to next step.
4. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminal STA of the ECM connector and body ground during the engine cranking. OK: Voltage: 0 V (Ignition switch ON) 6 V or more (Engine cranking) NG : Repair or replace harness or connector. OK : Go to next step.
5. Check DTC reoccur 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. Clear DTC (See «PRE-CHECK»(ref-206111-S34504961872005112400000) ). Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccur. RESULT: DISPLAY DTC OUTPUT Display (DTC Output) Proceed to P0617 A No DTC output B A : Replace ECM (See Engine Control Module (ECM) ) B : Check for intermittent problems (See «PRE-CHECK»(ref-206111-S34504961872005112400000) )

ECM receives the operating condition (ON/OFF) of A/C from A/C ECU and it also receives the electrical load information from the body ECU.

ECM uses these information to control the engine (idle up, etc.).

Scheme 261

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

Perform troubleshooting the Multiplex Communication System (See TROUBLESHOOTING ).

When the ignition switch is turned ON, battery voltage is applied to terminal IGSW of the ECM. The ECM "MREL" output signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.

If the ignition switch is turned OFF, the ECM holds the EFI relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.

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1. Check voltage between terminals +B and E1 of ECM connector. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminals +B and E1 of the ECM connector. OK: Voltage: 9 to 14 V OK : Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-206111-S23280708212005112400000) ). NG : Go to next step.
2. Check for open in harness and connector between terminal E1 of ECM and body ground (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.
3. Check voltage between terminals IGSW and E1 of ECM connector. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminals IGSW and E1 of the ECM connector. OK: Voltage: 9 to 14 V OK : Go to step 5 . NG : Go to next step.
4. Check ignition switch. Check continuity between the connector terminals shown in the chart below. CONNECTOR TERMINAL RESISTANCE Switch Terminal No. Resistance LOCK All Terminal to Terminal 1 Mohm or higher ACC 2 - 3 1 ohm or less ON 2 - 3 - 4 6 - 7 1 ohm or less START 1 - 2 - 4 6 - 7 - 8 1 ohm or less NG : Replace ignition switch. OK : Check and repair harness and connector between battery and ignition switch, ignition switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ).
5. Check voltage between terminals MREL and E1 of ECM connector. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminals MREL and E1 of the ECM connector. OK: Voltage: 9 to 14 V OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
6. Check EFI fuse. PREPARATION: Remove the EFI fuse from the engine room J/B. CHECK: Check continuity of EFI fuse. OK: Continuity NG : Check for short in all the harness and components connected to EFI fuse. OK : Go to next step.
7. Check EFI No. 1 fuse. PREPARATION: Remove EFI No. 1 fuse from engine room J/B. CHECK: Check continuity of EFI No. 1 fuse. OK: Continuity NG : Check for short in all the harness and components connected to EFI No. 1 fuse. OK : Go to next step.
8. Check EFI main relay (Marking: EFI) (See EFI Main Relay ). NG : Replace EFI main relay. OK : Go to next step.
9. Check for open and short in harness and connector between EFI relay and ECM, EFI relay and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Check and replace harness and connector between terminal +B of ECM and battery positive terminal (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ).

In the diagram below, when the engine is cranked, current flows from terminal ST2 of the ignition switch to the starter relay coil and also current flows to terminal STA of the ECM (STA signal).

When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates. While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the fuel pump also keeps operating.

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1. Connect the hand-held tester and check operation of fuel pump. 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/ACTIVE TEST/FUEL PUMP/SPD. CHECK: Check the relay operation while operating it with the hand-held tester. OK: Operating noise can be heard from the relay. OK : Go to step 5 . NG : Go to next step.
2. Check circuit opening relay (Marking: C/OPN) (See Circuit Opening Relay ). NG : Replace circuit opening relay. OK : Go to next step.
3. Check voltage between terminal FC of ECM and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminal FC of the ECM and body ground. OK: Voltage 9 to 14 V OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
4. Check for open and short in harness and connector between circuit opening relay (Marking: C/OPN) and ECM, circuit opening relay (Marking: C/OPN) and ignition switch (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) ).
5. Check fuel pump (See Fuel Pump ). NG : Repair or replace fuel pump. OK : Go to next step.
6. Check for open in harness and connector between circuit opening relay (Marking: C/OPN) and fuel pump, fuel pump and body ground (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) ).

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1. Check operation of fuel pump. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Connect between terminal FC of the ECM connector and body ground. Check for fuel pressure in the fuel inlet hose when it is pinched off. OK: There is pressure in fuel inlet hose. HINT: At this time, you will hear a fuel return flowing noise. OK : Proceed to next circuit inspection shown on problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-206111-S23280708212005112400000) ). NG : Go to next step.
2. Check operation of circuit opening relay (Marking: C/OPN). CHECK: When connecting between terminal FC of the ECM connector and the body ground, check the relay operation. OK: Noise can be heard from the circuit opening relay. OK : Go to step 6 . NG : Go to next step.
3. Check circuit opening relay (Marking: C/OPN) (See Circuit Opening Relay ). NG : Replace circuit opening relay. OK : Go to next step.
4. Check voltage between terminal FC of ECM and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure voltage between terminal FC of the ECM and body ground. OK: Voltage 9 to 14 V OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
5. Check for open and short in harness and connector between circuit opening relay (Marking: C/OPN) and ECM, circuit opening relay (Marking: C/OPN) and ignition switch (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) ).
6. Check fuel pump (See Fuel Pump ). NG : Repair or replace fuel pump. OK : Go to next step.
7. Check for open in harness and connector between circuit opening relay (Marking: C/OPN) and fuel pump, fuel pump and body ground (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) ).

Terminal TC and CG are located in the DLC3. When connecting these terminals, DTCs in normal mode or test mode can be read through the MIL flashing in the combination meter.

Scheme 275

HINT

1. Even though terminal TC is not connected with terminal CG, the MIL blinks.
2. For the above phenomenon, an open or short in the wire harness, or malfunction inside the ECM is the likely cause.

Scheme 276

1. Check voltage between terminals TC and CG of DLC3. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals TC and CG of the DLC3. OK: Voltage: 9 to 14 V OK : Replace ECM (See Engine Control Module (ECM) ). NG : Go to next step.
2. Check continuity between terminal CG of DLC3 and body ground. NG : Repair or replace harness or connector. OK : Go to next step.
3. Check for open and short circuit in harness and connector between ECM and DLC3, and DLC3 and body ground (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) ).