Engine Controls (2ZZ-GE) - 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-206112-S28777476602005112400000) ). If the malfunction does not recur 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-206112-S28777476602005112400000) ). 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, as well as 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 REFERENCE 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 14 V (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 14 V 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 «PRE-CHECK»(ref-206112-S06872093152005112400000) 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 DTC 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 comes 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. Clear the DTCs using the OBD II scan tool or the handheld 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. Clear the DTCs not using the OBD II scan tool or the hand-held tester. Remove the EFI and ETCS fuses 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. Clear 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. Clear the DTCs without using the OBD II scan tool or the hand-held tester. Remove the EFI and ETCS fuses 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.
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 PROCEED WITH TROUBLESHOOTING»(ref-206072-S42080900332005112300000) ). 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 «SOLENOID TESTS»(ref-163249-S40650891392004062300000) and «STARTER RELAY TEST»(ref-163249-S42063463112004062300000) , 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: Visually 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 hand-held tester to DLC3 on the vehicle. CHECK: Use CURRENT DATA to check the idle speed. OK: Idle speed: (M/T): 750 to 850 rpm (A/T): 700 to 800 rpm NG: Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-206112-S34454363872005112400000) . 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 FUEL PUMP in «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 FUEL PUMP in «SFI»(ref-206126) and continue to trouble-shoot. OK : Go to next step. Check for spark. PREPARATION: Disconnect the ignition coil assembly. 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 trouble shoot. OK : Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-206112-S34454363872005112400000) .
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
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 absorptive three-way catalyst HC absorptive 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 transmission 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 immobiliser system, Immobiliser 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 "snapshot" 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 borderline 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/GARB 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 H 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 O2S TEST RESULT 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-206112-S22842246032005112400000) ). 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 emissions 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 (EOT) 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 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 (EOT) 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 reinstall 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 approximately 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 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 (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 (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 for 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 CHART

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, see respective "DTC No." in the DTC chart.

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*1: MIL lights up.

*2: MIL lights up or blinks.

*: -.... MIL does not light up, White circle.... MIL lights up

DTC INDEX

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Each ECM terminals' standard 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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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 crankshaft position sensor, and performs the feedback control. This is how target valve timing is verified by the ECM.

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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, as well as other data from the time when a malfunction occurred.

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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 OCV by the hand-held tester. OK: TESTER OPERATION AND 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-206112-S06872093152005112400000) ). NG : Go to next step.
2. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery voltage between the 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, and 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) in «SFI»(ref-206126) ). 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-206112-S06872093152005112400000) ).

Scheme 445

Scheme 446

1. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery voltage between the 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, and check the waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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-206112-S06872093152005112400000) ).

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

Scheme 447

HINT

INSPECTION PROCEDURE

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 448

1. Check valve timing (Check for loose and jumped tooth of timing chain) (See «INSTALLATION»(ref-163200-S33740329352005020100000) ). 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 CONDITION 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 output reoccurs. PREPARATION: Clear the DTCs. Operating the hand-held 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 DTCs using the hand-held tool. OK: No DTC output. OK: VVT system 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 the 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) in «SFI»(ref-206126) ). 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 in «SFI»(ref-206126) ). 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 (See «REMOVAL»(ref-163200-S13032368722005020100000) ). 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) in «SFI»(ref-206126) ).

Scheme 449

Scheme 450

Scheme 451

1. Check valve timing (Check for looseness and jumped tooth of timing chain) (See «INSTALLATION»(ref-163200-S33740329352005020100000) ). NG: Adjust valve timing. OK : Go to next step.
2. Check operation of OCV. PREPARATION: Start the engine. CHECK: Check the engine speed when disconnecting the OCV connector. Check the engine speed when applying battery voltage between the terminals of the OCV. RESULT: 2: Go to step 4 . 1: Go to next step.
3. Check if DTC output reoccurs. 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 DTCs using the OBD II scan tool. OK: No DTC output. OK: VVT system 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, and 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) in «SFI»(ref-206126) ). OK : Go to next step.
5. Check oil control valve filter. NG: Replace oil control valve filter. OK : Go to next step.
6. Check OCV (See CAMSHAFT TIMING OIL CONTROL VALVE in «SFI»(ref-206126) ). OK: Go to step 8 . NG : Go to next step.
7. Replace OCV (See «REMOVAL»(ref-163200-S13032368722005020100000) ). : 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 (See «REMOVAL»(ref-163200-S13032368722005020100000) ). : 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 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 : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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

Scheme 452

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 loosen and jumped tooth of timing chain). NG: Adjust valve timing (Repair or replace timing chain). OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (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 453

Scheme 454

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 455

Scheme 456

Scheme 457

Scheme 458

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. OK: Resistance: 11 to 16 ohm (20°C) 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 HT1A, HT2A, HT1B, HT2B of ECM connectors and body ground. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals HT1A, HT2A, HT1B, HT2B of the ECM connectors and body ground. HINT: Connect terminal HT1A to bank 2 sensor 1. Connect terminal HT2A to bank 1 sensor 1. Connect terminal HT1B to bank 1 sensor 2. Connect terminal HT2B to bank 2 sensor 2. OK: Voltage: 9 to 14 V OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NG : Go to next step.
4. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and heated oxygen sensor, and heated oxygen sensor 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. Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

The MAP (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 MAP 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 MAP 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 459

Scheme 460

HINT

After confirming DTC P0100, P0102 or P0103, 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 461

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 462

Scheme 463

Scheme 464

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 the 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 the mass air flow rate on the OBD II scan tool or the hand-held tester. RESULT: RESULT 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-206112-S06872093152005112400000) ). 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 the voltage between terminal VG of the ECM connector and body ground while the 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) in «SFI»(ref-206126) ). 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 EFI relay (Marking: EFI) and mass air flow meter. NG: Repair or replace harness or connector. OK : Check ECM power source circuit (See «ECM Power Source Circuit»(ref-206112-S41673737312005112400000) ).
6. Check continuity between terminal EVG of ECM connector and body ground. PREPARATION: Remove the ECM cover. CHECK: Check the continuity between terminal EVG of the ECM connector and body ground. OK: Continuity (1 ohm or less) NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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: Replace mass air flow meter. OK : Go to next step. Repair or replace harness or connector.

Refer to DTC P0100 on DTC P0100 Mass or Volume Air Flow Circuit : DTC P0102 Mass or Volume Air Flow Circuit Low Input: DTC P0103 Mass or Volume Air Flow Circuit High Input .

Scheme 465

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: DTC OUTPUT RESULT Display (DTC output) Proceed to P0101 and other DTCs A 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-206112-S28777476602005112400000) ).

The intake air temperature (IAT) sensor, mounted on the mass air flow (MAP) 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 resistance varies as voltage changes to the ECM terminal. (Scheme 466)

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 (THAR) 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 changes in the intake air temperature, the potential at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.

Scheme 466

Scheme 467

HINT

After confirming DTC "P0110, P0112 or P0113", use the hand-held tester or the OBD II scan tool to confirm the intake air temperature in the "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL".

INTAKE AIR TEMPERATURE CIRCUIT - 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 OBDII 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 468

Scheme 469

Scheme 470

Scheme 471

1. Connect OBD II scan tool or hand-held tester, and read value of intake air temperature. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA / INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Same as actual intake air temperature and temperature displayed on the hand-held tester or OBD II scan tool. RESULT: RESULT Displayed Temperature Proceed to -40 °C (-40°F) A 140°C (284°F) or more B OK (Same as air temperature near to the intake) C HINT: If there is open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40 °F). If there is short circuit, the OBD II scan tool or the hand-held tester indicates 140°C (284°F) or more. B: Go to step 4 . C: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). A : Go to next step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the mass air flow meter 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/INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or handheld tester. OK: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace mass air flow meter. NG : Go to next step.
3. Check for open in harness or ECM. PREPARATION: Remove the ECM cover. Connect between terminals THA and EVG of the ECM connector. Turn the ignition switch ON. HINT: The mass air flow meter 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) ). When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA/INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or handheld 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) in «SFI»(ref-206126) ).
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 menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA/INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or handheld 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 E10 connector from the ECM. HINT: The mass air flow meter connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA/INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or handheld tester. OK: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

A thermistor is built in the Engine Coolant Temperature (EOT) 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 472

HINT

After confirming DTC "P0115, P0117 or P0118", 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.

ENGINE COOLANT TEMPERATURE CIRCUIT 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 OBDII 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 473

Scheme 474

Scheme 475

Scheme 476

1. Connect OBD II scan tool or hand-held tester, and read value of engine coolant temperature. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Same as actual engine coolant temperature and temperature displayed on the hand-held tester or the OBD II scan tool. RESULT: RESULT Displayed Temperature Proceed to -40 °C (-40°F) A 140°C (284°F) or more B OK (Same as air temperature near to the intake) C HINT: If there is open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40°F). If there is short circuit, the OBD II scan tool or the hand-held tester indicates 140°C (284°F) or more. B: Go to step 4 . C: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). 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 the temperature value on the OBD II scan tool or handheld 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: The engine coolant temperature 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 the temperature value on the OBD II scan tool or handheld tester. OK: Temperature value: 140°C (284°F) or more OK: Open in harness between terminals E2 and THW, repair or replace harness. NG : Confirm good connection at ECM. If OK, replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the engine coolant temperature sensor connector. Turn the ignition switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or handheld 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 E10 connector from the ECM. HINT: The engine coolant temperature sensor connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL DADA / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or handheld tester. OK: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Refer to DTC P0115 on DTC P0115 Engine Coolant Temperature Circuit : DTC P0117 Engine Coolant Temperature Circuit Low Input : DTC P0118 Engine Coolant Temperature Circuit High Input .

Scheme 477

HINT

1. If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
2. Read freeze frame data using the hand-held tester or the OBDII 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 OBDII 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 478

Scheme 479

1. Connect hand-held tester, and read the voltage for throttle position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / THROTTLE POS and THROTTLE POS#2. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: Result: B: Go to step 5 . A : Go to next step.
2. Check for open and short in harness and connector in VC, VTA1, VTA2 and E2 circuits 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 : Go to next step.
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. Disconnect the throttle position sensor connector. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
4. Replace throttle body (See THROTTLE BODY (2ZZ-GE) in «SFI»(ref-206126) ). : Go to next step
5. Check if DTC output recur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). RESULT: RESULT Display (DTC Output) Proceed to "P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135" are output again A No DTC output B OK: System is OK. NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 480

1. Check for open and short in harness and connector in VC, VTA1, VTA2 and E2 circuits between ECM and throttle position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ) NG: Repair or replace harness and connector. OK : Go to next step.
2. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. Disconnect the throttle position sensor connector. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
3. Replace throttle body (See THROTTLE BODY (2ZZ-GE) in «SFI»(ref-206126) ). : Go to next step
4. Check if DTC output recur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). RESULT: RESULT Display (DTC Output) Proceed to "P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135" are output again A No DTC output B B: System is OK. A : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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.

Replace throttle position sensor (See THROTTLE BODY (2ZZ-GE) in SFI ).

Refer to DTC P0115 on DTC P0115 Engine Coolant Temperature Circuit : DTC P0117 Engine Coolant Temperature Circuit Low Input : DTC P0118 Engine Coolant Temperature Circuit High Input .

Scheme 481

HINT

1. If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, the engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
2. Read freeze frame data using the hand-held tester or the OBDII 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. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTCs. RESULT: RESULT Display (DTC Output) Proceed to P0125 A "P0125" and other DTCs B HINT: If any other codes besides "P0125" is output, perform the troubleshooting for those codes first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Check thermostat (See «INSPECTION»(ref-206130-S17671394012005112400000) ). NG: Replace thermostat (See «REMOVAL»(ref-206130-S20584631402005112400000) ). 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. Check cooling system. CHECK: Check that there is defective cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on. NG: Repair or replace cooling system. OK : Go to next step.
2. Check thermostat (See «INSPECTION»(ref-206130-S17671394012005112400000) ). NG: Replace thermostat. YES : Go to next step.
3. 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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: RESULT 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-206112-S28777476602005112400000) ). A: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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 482

Scheme 483

HINT

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

Scheme 484

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

The heated oxygen sensor element consists of the platinum coated zirconia and heating element. The inner surface of sensor element is exposed to the outside air, and the outer surface of sensor element is exposed to the exhaust gas. The sensor generates between 0 V and 1 V of the voltage output in response to the oxygen concentration in the exhaust gas. The sensor's output voltage varies suddenly in the vicinity of the stoichiometric air-fuel ratio.

Under normal condition, the output voltage from the heated oxygen sensor alternates between RICH and LEAN sides periodically. When it is 0.4 V or less, the air-fuel ratio is judged as LEAN.

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 485

Scheme 486

Scheme 487

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

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 approximately 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 488

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 OBDII 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 489

Scheme 490

Scheme 491

Scheme 492

Scheme 493

1. Are there any other codes (besides DTC P0130, P2195 or P2196) 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: RESULT Display (DTC output) Proceed to P0130, P2195 and/or P2196 A P0130, P2195 and/or P2196 and other DTCs B HINT: If any other codes besides P0130, P2195 and/or P2196 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Check output voltage of heated 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 while idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.5 V (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. OK: Resistance: 11 to 16 ohm (20°C) 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 heated 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.
6. Check air induction system. 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 FUEL PUMP in «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). OK : Go to next step.
8. Check injector injection (See INJECTOR in «SFI»(ref-206126) ). NG: Replace injector. OK : Go to next step. 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, P2195 or P2196 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). YES: Replace heated oxygen sensor (bank 1 sensor 1).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1) .

Scheme 494

HINT

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

Refer to PRE-CHECK for detailed information.

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).

1. 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 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds. Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL." 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 495

The following of the 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.

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 OBDII 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 496

Scheme 497

Scheme 498

Scheme 499

Scheme 500

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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES." CHECK: Read the DTCs. RESULT: RESULT Display (DTC output) Proceed to P0133 A P0133 and other DTC B HINT: 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-206112-S28777476602005112400000) ). A : Go to next step.
2. Check output voltage of heated 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 menu: 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 exist less than 0.6 second (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. OK: Resistance: 11 to 16 ohm (20°C) 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 heated 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. CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK : Go to next step.
7. Check fuel pressure (See FUEL PUMP in «SFI»(ref-206126) ). CHECK: Check fuel pressure (high or low pressure). NG: Check and repair fuel pump, fuel pipe line and filter (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). OK : Go to next step.
8. Check injector injection (See INJECTOR in «SFI»(ref-206126) ). NG: Replace injector. OK : Replace heated oxygen sensor (bank 1 sensor 1).
9. Perform confirmation driving pattern (See «DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1)»(ref-206112-S05847443492005112400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. : Go to next step
10. Is there DTC P0133 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). YES : Replace heated oxygen sensor (bank 1 sensor 1).

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1) .

Scheme 501

HINT

1. Sensor 1 refers to the sensor closer to the engine body.
2. 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).

1. 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 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds. Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. 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 502

The following of the 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 OBDII 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 503

Scheme 504

Scheme 505

Scheme 506

1. Are there any other codes (besides DTCs 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: RESULT 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-206112-S28777476602005112400000) ). A : Go to next step.
2. Connect OBD II scan tool or hand-held tester, and read value for voltage output of heated 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. OK: Resistance: 11 to 16 ohm (20°C) 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 heated 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-206112-S01270228112005112400000) ). OK : Go to next step.
8. Check air induction system (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK : Go to next step.
9. Check fuel pressure (See FUEL PUMP in «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, fuel pipe line and filter (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). OK : Go to next step.
10. Check injector injection (See INJECTOR in «SFI»(ref-206126) ) 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 of driving pattern (See «DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1)»(ref-206112-S05847443492005112400000) ). HINT: Clear all DTCs prior to performing the confirmation pattern. : Go to next step
13. Is there DTCs P0134 being output again? YES: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NO : Go to next step.
14. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). YES : DTCs P0134 are caused by running out of fuel.

Refer to DTC P0130 on DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1) : DTC P2195 Oxygen Sensor Signal Stuck Lean (Bank 1 Sensor 1) : DTC P2196 Oxygen Sensor Signal Stuck Rich (Bank 1 Sensor 1) .

Scheme 507

HINT

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

Refer to PRE-CHECK for detailed information.

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).

1. 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 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds. Select the menu "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL." 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 approximately 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 508

The following of the 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 OBDII 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 509

Scheme 510

Scheme 511

Scheme 512

Scheme 513

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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES." CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT 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-206112-S28777476602005112400000) ). A : Go to next step.
2. Check output voltage of heated 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 menu: 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. OK: Resistance: 11 to 16 ohm (20°C) 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 heated 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.
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-206112-S06872093152005112400000) ). 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 and carried out in "long-term" to compensate a continual deviation from the theoretical central value by the "short-term" fuel trim, due to individual engine's specifications and engine deterioration with time.

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

Scheme 514

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 515

Under closed-loop fuel control, fuel injection amounts that deviate 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 +35% or less than -35%. The ECM interprets this as a malfunction in the fuel system.

Scheme 516

Scheme 517

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).

1. 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 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 rpm for approximately 90 sec. Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". 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 518

The following of the 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 OBDII 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 519

Scheme 520

Scheme 521

Scheme 522

Scheme 523

Scheme 524

Scheme 525

Scheme 526

Scheme 527

Scheme 528

1. Check air induction system (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). 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 in «SFI»(ref-206126) ). NG: Replace injector. OK : Go to next step.
4. Check mass air flow meter. PREPARATION: Remove the mass air flow meter. CHECK: Check the output voltage. Apply the battery voltage terminals +B and E2G. Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G. Blow air into the mass air flow meter, and check that the voltage fluctuates. Inspect the resistance 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 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 (by warming up or cooling down) and repeat the test, (a) Reinstall the engine coolant temperature sensor. 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 FUEL PUMP in «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, fuel pipe line and filter (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). 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 output voltage of heated oxygen sensor (bank 1 sensor 1) 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 graphic). 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. OK: Resistance: 11 to 16 ohm (20°C) 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 heated 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.
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-206112-S06872093152005112400000) ).(*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 perform 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) in «SFI»(ref-206126) ) and perform confirmation driving pattern (Refer to step 14 ). NO : Go to next step.
16. Confirm if vehicle has run out of fuel in the past. NO: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). YES : DTC P0171 or P0172 is caused by fuel shortage.
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? YES: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ) and perform confirmation driving pattern (Refer to step 14 ). NO : Go to next step.
22. Confirm if vehicle has run out of fuel in the past. NO: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). YES : DTC P0171 or P0172 is caused by fuel shortage.

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 passing through the catalyst also cause the temperature of the catalyst to increase, possibly damaging the catalyst. To prevent this increase in the 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 misfire, the ECM uses both camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify misfiring cylinders and crankshaft position sensor is used to measure variations in the crankshaft rotation speed. The misfire counter increments when crankshaft rotation speed variations exceed threshold values.

The ECM illuminates the MIL if the misfiring rate exceeds a threshold value, which could cause emissions deterioration.

Scheme 529

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 by 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 in the illustration.

Scheme 530

Scheme 531

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

The ECM will illuminate the MIL when the percentage of 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 (the MIL blinks immediately) if

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

Scheme 532

Scheme 533

Scheme 534

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 OBDII 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 or 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 using the hand-held tester or OBD II scan tool.
6. Start the engine and drive the confirmation pattern.
7. Read the value of the misfire ratio for each cylinder. Or read the DTC.
8. Repair 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, or 3) the ignition plug is contaminated.
13. Be sure to check the value on the misfire counter after the repair.

Scheme 535

Scheme 536

Scheme 537

Scheme 538

Scheme 539

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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT 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 and/or P0304 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). 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 menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL#1 to CYL#4. CHECK: Read the number of misfire cylinder 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: RESULT CHART 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 of 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 another 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 in «SFI»(ref-206126) ). 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 in «SFI»(ref-206126) ). 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 CYLINDER RATE 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-206112-S06872093152005112400000) ). A : Go to next step.
15. Check valve timing (Check for loose or a jumped tooth of the timing chain) (See «INSTALLATION»(ref-163200-S33740329352005020100000) ). NG: Adjust valve timing. OK : Go to next step.
16. Check fuel pressure (See FUEL PUMP in «SFI»(ref-206126) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, fuel pipe line and filter (See «PRECAUTION»(ref-206126-S25696282382005112400000) ). 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 menu: "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 menu: "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAP". Read its value displayed on the hand-held tester or the OBD II scan tool. OK: AIR FLOW RATE Condition Airflow 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: Replace mass air flow meter. OK : Go to next step.
18. Check engine coolant temperature sensor (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR in «SFI»(ref-206126) ). PREPARATION: Remove the engine coolant temperature sensor. CHECK: Measure the resistance between the terminals of the engine coolant temperature sensor. OK: 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 (by warming up or cooling down) and repeat the test. Reinstall the engine coolant temperature sensor. 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 CYLINDER RATE 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-206112-S06872093152005112400000) ).

The flat type knock sensor (non-resonant type) has a structure that can detect vibrations in a wide frequency, from about 6 kHz to 15 kHz, and has the following features.

Knock sensors are fitted on the right bank and left bank of the cylinder block to detect the engine knocking. Each sensor contains a piezoelectric element which generates a voltage when it becomes deformed. This occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is retarded to suppress it.

Scheme 540

HINT

If the ECM detects the DTC P0325, P0327 and P0328, it enters the fail-safe mode in which the corrective retarded angle value is set to the maximum value.

Scheme 541

Reference: Inspection by using the oscilloscope.

After warning up, run the engine at 4,000 rpm, check the waveform between terminals KNK1 and EKNK of the ECM connector.

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 542

Scheme 543

Scheme 544

Scheme 545

1. Read output DTC. 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. Clear the DTCs. Warm up the engine. Run the engine at 3,000 rpm for 10 seconds or more. CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT Display (DTC output) Proceed to P0325 A P0325 and P0327 and/or P0328 B No output C B: Go to step 3 . C: Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ) A : Go to next step.
2. Check knock sensor. CHECK: Check the knock sensor installation. Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) NG: Securely reinstall sensor. OK : Replace knock sensor.
3. Check for open and short in harness and connector between ECM and knock sensor. PREPARATION: Disconnect the E11 ECM connector. CHECK: Measure the resistance between the terminals of the ECM connector. OK: Resistance: 120 to 280 kohm at 20 °C (68 °F) NG: Go to step 5 . OK : Go to next step.
4. Check voltage between terminal KNK1 and EKNK of ECM connector. PREPARATION: Disconnect the E11 ECM connector. Turn the ignition switch ON. CHECK: Measure the voltage between the terminals of the ECM terminals. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). NOTE: Fault may be intermittent. Check wire harness and connectors carefully.
5. Check knock sensor. PREPARATION: Remove the knock sensor. CHECK: Measure the resistance between the terminals. OK: Resistance: 120 to 280 kohm at 20°C (68°F) NG: Replace knock sensor. OK : Repair or replace harness or connector.

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 546

Scheme 547

Reference: Inspection by using the oscilloscope.

HINT

The correct waveform is as shown on the in (Scheme 547).

ITEM CONTENTS

HINT

1. Read freeze frame data using the hand-held tester or the OBDII 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. Select the menu "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 are no NE signals from the crankshaft position sensor despite running the engine, the engine speed will be indicated as zero. If the voltage output of the crankshaft position sensor is insufficient, the engine speed will be indicated as lower RPM (than the actual RPM).

Scheme 548

Scheme 549

1. Check resistance of crankshaft position sensor. Disconnect the crankshaft position sensor connector. 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 sensor. OK : Go to next step.
4. Check teeth of signal plate. PREPARATION: Remove the crankshaft angle sensor plate (See «REMOVAL»(ref-163200-S28314870632005020100000) ). CHECK: Check the teeth of sensor plate. NG : Replace signal plate. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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

The G signal plate has 3 tooth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, protrusion on the signal plate and the air gap on the pickup coil changes, causing fluctuations in the magnetic field and generating voltage 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 signal, and the cylinder and angle of VVT based on the combination of the G and NE signal.

Scheme 550

Reference: Inspection by using the oscilloscope.

HINT

The correct waveform is (Scheme 551)

Scheme 551

Scheme 552

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 553

Scheme 554

1. Check resistance of camshaft position sensor (See «ON-VEHICLE INSPECTION»(ref-206133-S19742093492005112400000) ). CHECK: Measure the resistance between the terminals of camshaft 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 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 sensor. OK : Go to next step.
4. Check teeth of camshaft timing pulley. NG : Replace camshaft timing pulley. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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 555

Scheme 556

Scheme 557

Scheme 558

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) in «SFI»(ref-206126) ). 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) in «SFI»(ref-206126) ). 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) in «SFI»(ref-206126) ). OK : Go to next step.
7. Check ignition coil with igniter power source circuit. PREPARATION: Disconnect the ignition coil with igniter connector. CHECK: Measure the voltage between terminal 1 of the ignition coil with igniter connector and body ground when the ignition switch is turned to ON and START position. OK: Voltage: 9 to 14 V NG : Repair ignition coil with igniter power source circuit. OK : Go to next step.
8. Check for open and short in harness and connector between ignition switch 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 : 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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES." CHECK: Read the DTCs. RESULT: DTC OUTPUT RESULT 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-206112-S28777476602005112400000) ). 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 HEATED OXYGEN SENSOR in «SFI»(ref-206126) ). HINT: Refer to the hint following the end of this flowchart. NG : Repair or replace heated oxygen sensor. OK : Go to next step.
4. Check oxygen sensor (bank 1 sensor 2) (See HEATED OXYGEN SENSOR in «SFI»(ref-206126) ). HINT: Refer to the hint following the end of this flowchart. NG : Repair or replace heated oxygen sensor. OK : Replace three-way catalytic converter. HINT: Hand-held tester only: 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. Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen sensor or other trouble areas can be distinguished). "A/F CONTROL" is ACTIVE TEST which changes the injection volume -12.5 % or +25 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds. Select the menu "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL." 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 approximately 20 seconds delay at maximum in the sensor 2 (rear sensor).

Scheme 559

The following of the 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.

1. If different DTCs related to different systems while terminal E2 as ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
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.

The vapor pressure sensor, canister closed valve (CCV), and 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 560) below, or when there is a malfunction in either the EVAP VSV, the pressure switching valve, or in the vapor pressure sensor itself.

Scheme 560

Scheme 561

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, DTC P0452 Evaporative Emission Control System Pressure Sensor/Switch Low Input, DTC P0453 Evaporative Emission Control System Pressure Sensor/Switch High Input»(ref-206112-S11084976222005112400000) ) 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-206112-S27012012482005112400000) ), 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 OBDII 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 562

Scheme 563

Scheme 564

Scheme 565

Scheme 566

Scheme 567

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

Scheme 568

Scheme 569

Scheme 570

Scheme 571

Scheme 572

Scheme 573

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go to next step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to next step.
3. Check fuel tank cap (See «INSPECTION»(ref-206125-S08304753912006073100000) ). NG: Replace fuel tank cap. OK: Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to next step.
5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emission leak part. OK: Go to next step.
6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve, and pressure switching valve and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG: Repair or 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 «INSPECTION»(ref-206125-S08304753912006073100000) ), fuel evap pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go to next step.
8. Check vacuum hoses ((8), (9), (10) and (11) in (Scheme 560) in circuit description). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages, 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 VSV or sensor connector. OK: Go to next step.
10. Check charcoal canister for cracks, holes and damages. NG: Check and replace charcoal canister. OK: Go to next step.
11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK: Go to next step.
12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connector under following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14. NG: Go to next step.
13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
14. Check EVAP VSV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal EVP of the ECM connector and body ground (ON). Disconnect the terminal EVP of the ECM connector and body ground (OFF). OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17. NG: Go to next step.
15. Check operation of EVAP VSV (See VSV FOR EVAPORATIVE EMISSION (EVAP) in «SFI»(ref-206126) ). NG: Replace EVAP VSV. OK: Go to next step.
16. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
17. Check CCV. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the CCV function. Connect the terminal CCV of the ECM connector and body ground (ON). Disconnect the terminal CCV of the ECM connector and body ground (OFF). OK: CCV is ON: Air does not flow from port E to port F. CCV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to next step.
18. Check operation of CCV (See VSV FOR CANISTER CLOSED VALVE (CCV) in «SFI»(ref-206126) ). NG: Replace CCV. OK: Go to next step.
19. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
20. Check pressure switching valve. PREPARATION: Remove the ECM cover. Turn the ignition switch ON. CHECK: Check the pressure switching valve function. Connect the terminal TBP of the ECM connector and body ground (ON). Disconnect the terminal TBP of the ECM connector and body ground (OFF). OK: Pressure switching valve is ON: Air from port E flows out through port F. Pressure switching valve is OFF: Air does not from flow port E to port F. OK: Go to step 23. NG: Go to next step.
21. Check operation of pressure switching valve (See VSV FOR PRESSURE SWITCHING VALVE in «SFI»(ref-206126) ). NG: Replace pressure switching valve. OK: Go to next step.
22. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).
23. Check fuel tank inlet valve. NG: Replace fuel tank inlet valve. OK: Go to next step.
24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

The vapor pressure sensor, canister closed valve (CCV) and 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.

DTC P0442 or P0456 is recorded by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 574) below, or when the vapor pressure sensor malfunctions.

Scheme 574

Scheme 575

Scheme 576

HINT

Typical DTC output of each trouble part

Scheme 577

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, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
3. Read freeze frame data using the hand-held tester or the OBDII 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 578

Scheme 579

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) in «SFI»(ref-206126) ). 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: The vacuum applied to the 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 : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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 580

Scheme 581

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 582

Scheme 583

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 (Scheme 583) when the wheel is turned slowly. NG: Repair or replace harness or connector. OK: Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

In addition to turning on the stop lamp, the stop light switch signals are used for a variety of engine and transmission functions as well as the stop lamp. This switch is designed with two complementary signal outputs: STP and ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.

HINT

Normal condition is as shown in the table.

NORMAL CONDITION

Scheme 584

Scheme 585

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 586

1. Check operation of stop light. PREPARATION: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG : Check and repair stop light circuit (See «INSPECTION»(ref-206206-S40995348612005112400000) ). OK : Go to next step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the instrument panel J/B. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG : Check for short in all harness and components connected to STOP fuse. OK : Go to next step.
3. Check stop light switch (See «INSPECTION»(ref-206206-S40995348612005112400000) ). NG : Replace stop light switch. OK : Go to next step.
4. Check STP signal and ST1- voltage. PREPARATION: Connect the to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. Enter the following menu: "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW". CHECK: Read the STP signal on the hand-held tester. Measure the voltage between terminals ST1- and body ground. OK: TERMINALS VOLTAGE REFERENCE Brake Pedal STP Signal ST1- Voltage Depressed ON Below 1.5 V Released OFF 7.5 to 14 V OK : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). NG : Go to next step.
5. Check harness and connector between ECM and stop light 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) in «SFI»(ref-206126) ).

Scheme 587

1. Check operation of stop light. PREPARATION: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG : Check and repair stop light circuit (See «INSPECTION»(ref-206206-S40995348612005112400000) ). OK : Go to next step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the instrument panel J/B. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG : Check for short in all harness and components connected to STOP fuse. OK : Go to next step.
3. Check stop light switch (See «INSPECTION»(ref-206206-S40995348612005112400000) ). NG : Replace stop light switch. OK : Go to next step.
4. Check voltage between terminal STP and ST1- of ECM and body ground. PREPARATION: Turn the ignition switch ON. CHECK: Check voltage between terminal STP and ST1- of ECM and body ground. OK: TERMINALS VOLTAGE REFERENCE Brake Pedal STP Voltage ST1- Voltage Depressed 7.5 to 14 V Below 1.5 V Released Below 1.5 V 7.5 to 14 V OK : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). NG : Go to next step.
5. Check harness and connector between ECM and stop light 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) in «SFI»(ref-206126) ).

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 the accelerator pedal is not fully released, 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.

1. Are there any other codes (besides P0505 and P0511) 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. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT RESULT 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 codes first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). 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 for vacuum leaks in air induction system. NG : Repair or replace air induction system. OK : Check electric throttle control system (See THROTTLE BODY (2ZZ-GE) in «SFI»(ref-206126) ).

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 588

Scheme 589

1. Check EFI fuse of engine room J/B. PREPARATION: Remove the EFI fuse from the engine room J/B. CHECK: Check the continuity of the EFI fuse. OK: Continuity NG : Check for short in all 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 the voltage between terminal BATT of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NG : Go to next step.
3. Check for open or short in harness and connector between ECM and EFI No. 1 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.

Replace ECM (See ENGINE CONTROL MODULE (ECM) in SFI ).

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 590

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 menu: 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: IGNITION SWITCH POSITION 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-206114-S14864927042005112400000) ). 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. TERMINALS CONTINUITY REFERENCE Switch Terminal No. Resistance LOCK All Terminal to Terminal 1 Mohm or more ACC 2 - 3 1ohm or less ON 2 - 3 - 4 6 - 7 1ohm or less START 1 - 2 - 4 6 - 7 - 8 1ohm or less 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 menu: 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: IGNITION SWITCH POSITION 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 OBD II scan tool. Turn the ignition switch ON and OBD II scan tool main switch ON. Clear DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ) Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccur. RESULT: DTC OUTPUT RESULT Display (DTC Output) Proceed to P0617 A No DTC output B A : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). B : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ).

Scheme 591

Scheme 592

Scheme 593

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-206114-S14864927042005112400000) ). 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. TERMINALS CONTINUITY REFERENCE Switch Terminal No. Resistance LOCK All Terminal to Terminal 10 kohm or higher ACC 2 - 3 Below 1ohm ON 2 - 3 - 4 6 - 7 Below 1ohm START 1 - 2 - 4 6 - 7 - 8 Below 1ohm 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. Turn the ignition switch ON and OBD II scan tool main switch ON. Clear DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccur. RESULT: DTC OUTPUT RESULT Display (DTC Output) Proceed to P0617 A No DTC output B A : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). B : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ).

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

Scheme 594

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.

Perform troubleshooting the Multiplex Communication System (See MULTIPLEX COMMUNICATION CIRCUIT ).

The throttle motor is operated by the ECM and it opens and closes the throttle valve.

The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle motor and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

This Electrical Throttle Control System (ETCS) does not use a throttle cable.

Scheme 595

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 596

1. Check throttle control motor. PREPARATION: Disconnect the throttle control motor connector. CHECK: Measure the resistance between terminals 1 and 2 of the throttle control motor. OK: Resistance: 0.3 to 100 ohm at 20°C (68°F) NG : Replace throttle control motor (See THROTTLE BODY (2ZZ-GE) in «SFI»(ref-206126) ). OK : Go to next step.
2. Check for open and short in harness and connector between throttle control motor 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.
3. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check between the throttle valve and the housing for foreign objects. Also, check if the valve can open and close smoothly. NG : Remove foreign objects and clean throttle body. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

The throttle motor is operated by the ECM. It opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body.

The throttle position sensor provides feedback to the ECM to control the throttle motor and set the throttle valve angle in response to driver input.

HINT

This Electrical Throttle Control System (ETCS) is not used on the throttle cable.

Scheme 597

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. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check between the throttle valve and the housing for foreign objects. Also, check if the valve can open and close smoothly. NG : Remove foreign object and clean throttle body. OK : Go to next step.
2. Check if DTC outputs reoccur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Start and warm up the engine. Run the engine. Fully depress and release the accelerator pedal in a moment. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). RESULT: DTC OUTPUT RESULT Display (DTC Output) Proceed to No DTC output A DTC P2111 or P2112 output reoccur B B : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). A : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ).

The Electronic Throttle Control System (ETCS) has a dedicated power supply circuit. The voltage (+BM) is monitored and when the voltage is low (less than 4V), the ECM concludes that the ETCS has a fault and current to the throttle control motor is cut.

When the voltage becomes unstable, the ETCS itself becomes unstable. For this reason, when the voltage is low, the current to the motor is cut. If repairs are made and the system has returned to normal, turn the ignition switch OFF. The ECM then allows current to flow to the motor and the motor can be restarted.

HINT

This Electrical Throttle Control System (ETCS) does not use a throttle cable.

Scheme 598

Scheme 599

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 600

Scheme 601

1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse from the engine room R/B No. 1. CHECK: Check the continuity of the ETCS fuse. OK: Continuity NG : Check for short in all harness and components connected to ETCS fuse. OK : Go to next step.
2. Check voltage between terminal +BM of ECM connector and body ground. PREPARATION: Remove the glove compartment door (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). CHECK: Measure the voltage between terminal +BM of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). NG : Go to next step.
3. Check for open and short in harness and connector between ECM and ETCS fuse, ETCS 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 engine room R/B No. 1.

The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve, a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position sensor that detects the accelerator pedal position, and the ECM that controls the ETCS system.

The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs. The throttle position sensor, mounted on the throttle body, detects the opening angle of the throttle valve and provides this signal to the ECM so that the ECM can regulate the throttle motor.

Scheme 602

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 P2119) 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 menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES." CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT RESULT Display (DTC Output) Proceed to Only P2119 is output A P2119 and other DTC are output B HINT: If any other codes besides P2119 are output, perform the troubleshooting for those codes first. B : Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). A : Go to next step.
2. Check if DTC outputs reoccur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Start and warm up the engine. Run the engine at idle for 15 seconds or more. Perform the stall test. Move the shift lever to D Position and fully depress the accelerator pedal for 5 seconds. Then release the pedal for 5 seconds or more. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). OK: No DTC output. OK : System is normal. NG : Replace throttle 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 603

Scheme 604

1. Connect hand-held tester, and read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: ACCELERATOR PEDAL POSITION VOLTAGE REFERENCE Accelerator pedal VPA1 VPA2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 5.3 V OK : Go to step 5 . NG : Go to next step.
2. Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2 EPA and EPA2 circuit between ECM and accelerator pedal position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ) NG : Repair or replace harness and connector. OK : Go to next step.
3. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM terminals. CHECK: Remove the ECM cover. Turn the ignition switch ON. Disconnect the accelerator pedal position sensor connector. CHECK: Measure the voltage between terminals VCPA and EPA, and VCP2 and EPA2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
4. Replace accelerator pedal assembly (See ACCELERATOR PEDAL POSITION SENSOR in «SFI»(ref-206126) ). Go to next step.
5. Check if DTC output recur? PREPARATION: Connect the hand-held tester to the DLC3. Clear the DTC by hand-held tester, or disconnect the battery terminals or remove the EFI fuses and ETCS fuses (Clear DTCs). Start the engine. Drive the engine at idle for 15 sec. or more. CHECK: Read the DTC output. OK: No DTC output. OK : System is OK. NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 605

1. Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2 EPA and EPA2 circuit between ECM and accelerator pedal 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.
2. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM terminals. CHECK: Remove the ECM cover. Turn the ignition switch ON. Disconnect the accelerator pedal position sensor connector. CHECK: Measure the voltage between terminals VCPA and EPA, and VCP2 and EPA2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
3. Replace accelerator pedal position sensor (See ACCELERATOR PEDAL POSITION SENSOR in «SFI»(ref-206126) ). Go to next step.
4. Check if DTC output recur? PREPARATION: Connect the OBD II scan tool to the DLC3. Disconnect the battery terminals or remove the EFI fuse and ETCS fuses (Clear DTCs). Start the engine. Drive the engine at idle for 15 sec. or more. CHECK: Read the DTC output. OK: No DTC output. OK : System is OK. NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

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 606

1. Connect hand-held tester, and read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: ACCELERATOR PEDAL POSITION SENSOR VOLTAGE REFERENCE Accelerator pedal VPA1 VPA2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 5.3 V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NG : Go to next step.
2. Check for open and short in harness and connector between accelerator pedal position 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 accelerator pedal position sensor.

Scheme 607

Scheme 608

1. Check voltage between terminals VPA and EPA, VPA2 and EPA2 of ECM terminals. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPA, VPA2 and EPA2 of the ECM connectors. OK: OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NG : Go to next step.
2. Check for open and short in harness and connector between accelerator pedal position 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 accelerator pedal assembly (See ACCELERATOR PEDAL POSITION SENSOR in «SFI»(ref-206126) ).

To accelerate the activation of catalyst when warming up the engine, the air injection system pumps the secondary air to the exhaust manifold. The secondary air is supplied by the air pump and is pumped to the exhaust manifold through the air switching valve. Open and close movement of the air switching valve is regulated by the vacuum switching valve (VSV). The air pump and the air switching valve are observed by the ECM and are used to detect malfunction in this system.

The ECM monitors the secondary air injection system and detects malfunction using a pressure sensor located on the air switching valve.

Scheme 609

Scheme 610

HINT

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

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Start the engine.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / SECOND AIR VSV / ALL or USER DATA (press the right or left button). NOTE: When selecting USER DATA, select "SECONDARY AIR" and "SECOND AIR VSV" on the screen by pressing the "YES" button on the tester. HINT: When operating the VSV in the secondary air system, the air pump is also operated at the same time.
5. Check that the SECONDARY AIR, SECOND AIR VSV and 2ND AIR PRESS on the hand-held tester indicate the same conditions as the chart below.

Note. This test allows the technician to operate the VSV for only 5 seconds. If you perform the test again, more than 30 seconds interval must be required after the previous test is done.

Scheme 611

HINT

*1: Means the signal output from the ECM to operate the air pump.

*2: Means the signal output from the ECM to operate the VSV.

*3: Means the difference between the air pressure inside the air pressure sensor and the atmospheric pressure. When the pressure inside the secondary air injection system is equal to the atmospheric pressure, the hand-held tester displays "0 kPa".

Scheme 612

1. Check for open and short in harness and connector between pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness and connector. OK : Go to next step.
2. Inspect ECM (AIP voltage). PREPARATION: Connect the pressure gauge to the pressure sensor as shown in the illustration. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON and push the hand-held tester main switch ON (Do not start engine). Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / 2ND AIR PRESS. CHECK: Check that the pressure displayed on the hand-held tester fluctuates when applying the pressure to the pressure sensor with the pressure gauge. NG : Replace pressure sensor (See «AIR PUMP SYSTEM (2ZZ-GE)»(ref-206125-S15535808842006073100000) ). OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

To accelerate the activation of catalyst when warming up the engine, the air injection system pumps the secondary air to the exhaust manifold by pressure. The secondary air is supplied by the air pump and it is pumped to the exhaust manifold through the air switching valve. Open and close movement of the air switching valve is regulated by the vacuum switching valve (VSV). The air pump and the air switching valve are observed by the ECM and are used to detect malfunction in this system.

The ECM monitors the secondary air injection system and detects malfunction using a pressure sensor located on the air switching valve.

Scheme 613

Scheme 614

Refer to DTC P2430 on DTC P2430 Secondary Air Injection System Air Flow/Pressure Sensor Circuit Bank 1, DTC P2431 Secondary Air Injection System Air Flow/Pressure Sensor Circuit Range/Performance Bank 1, DTC P2432 Secondary Air Injection .

Scheme 615

In order to improve the engine performance at both high and low engine speeds, the VVTL-i system varies valve lift using the standard cam and high lift cam. This provides the high power engine performance as well as an emission reduction and good fuel economy.

When the engine speed reaches 6,000 rpm, the ECM signals the OCV for VVTL-i to switch the effective cam from standard one to high lift one hydraulically.

The ECM controls the OCV to apply hydraulic pressure to the piston in the rocker arm and switches the rocker arm by locking the slipper for high speed.

Scheme 616

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 617

Scheme 618

1. Check OCV for VVTL circuit. PREPARATION: Start the engine and warmed it up. 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 / ALL/VVTL CTRL B1. Maintain engine speed at 1,500 to 2,500 rpm. CHECK: Check the engine speed when operate the OCV for VVTL by the hand-held tester. OK: TESTER OPERATION AND SPECIFIED CONDITION Tester Operation Specified Condition VVTL CTRL B1 is OFF (OCV is OFF) Normal engine speed VVTL CTRL B1 is ON (OCV is ON) Rough engine speed or engine stalled OK : Check for intermittent problems (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). NG : Go to next step.
2. Check operation of OCV for VVTL. PREPARATION: Start the engine and warmed it up. CHECK: Check the engine speed at (1) and (2). Disconnect the C2 camshaft timing oil control valve connector. Apply the battery voltage between the terminals of the camshaft timing oil control valve. RESULT: OK: Engine stalled. B : Replace OCV for VVTL. A : Go to next step.
3. Check voltage between terminals OVL+ and OVL- of ECM connector (See «TERMINALS OF ECM»(ref-206112-S40952162522005112400000) ). NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
4. Check for open and short in harness and connector between OCV for VVTL and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Scheme 619

Scheme 620

1. Check operation of OCV for VVTL. PREPARATION: Start the engine and warm it up. CHECK: Check the engine speed at (1) and (2). Disconnect the C2 camshaft timing oil control valve connector. Apply the battery voltage between the terminals of the camshaft timing oil control valve. RESULT: OK: Engine stalled. NG : Replace OCV for VVTL. OK : Go to next step.
2. Check voltage between terminals OVL+ and OVL- of ECM connector (See «TERMINALS OF ECM»(ref-206112-S40952162522005112400000) ). NG : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). OK : Go to next step.
3. Check for open and short in harness and connector between OCV for VVTL and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ). NG : Repair or replace harness or connector. OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ).

Refer to DTC P2645 on DTC P2645 OCV for VVTL Circuit (Bank 1) .

Scheme 621

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.

Scheme 622

Scheme 623

Scheme 624

Scheme 625

Scheme 626

Scheme 627

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 14V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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 14V OK : Go to step 5 . NG : Go to next step.
4. Check ignition switch (See «INSPECTION»(ref-206193-S07187498032005112400000) ). 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 14V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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 IGN 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 in «SFI»(ref-206126) ). 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.

Scheme 628

Scheme 629

Scheme 630

1. Connect the hand-held tester and check operation of fuel pump (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). 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 if operating sounds can be heard while operating the relay with the hand-held tester. OK: Operating sounds 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 in «SFI»(ref-206126) ). 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 14V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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 : Go to next step.
5. Check fuel pump (See FUEL PUMP in «SFI»(ref-206126) ). 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) in «SFI»(ref-206126) ).

Scheme 631

Scheme 632

Scheme 633

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-206112-S34454363872005112400000) ). 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 in «SFI»(ref-206126) ). 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 14V OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). 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) in «SFI»(ref-206126) ).
6. Check fuel pump (See FUEL PUMP in «SFI»(ref-206126) ). 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) in «SFI»(ref-206126) ).

The ignition switch provides circuit power and the ECM provides the circuit ground that illuminates the MIL. MIL operation is checked visually

It should be illuminated when the ignition is first turned on. If the MIL is off all of the time or on all of the time, use the procedure below to troubleshoot it. The MIL is used to indicate the ECM's detection of vehicle malfunction. Follow this procedure using the hand-held tester or an OBD II scan tool to determine the cause of the problem and to check the MIL.

Scheme 634

HINT

Troubleshoot each trouble symptom in accordance with the chart below.

MIL CIRCUIT INSPECTION

Scheme 635

1. Clear DTC. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC 3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Read the DTCs (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). Clear the DTCs (See «PRE-CHECK»(ref-206112-S06872093152005112400000) ). CHECK: Check that MIL is not illuminated. OK: MIL is not illuminated OK : Repair circuit indicated by output DTC (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-206112-S28777476602005112400000) ). NG : Go to next step.
2. Check for short in wire harness. PREPARATION: Disconnect the E9 ECM connector. Turn the ignition switch ON. CHECK: Check that MIL is not illuminated. OK: MIL is not illuminated OK : Replace ECM (See ENGINE CONTROL MODULE (ECM) in «SFI»(ref-206126) ). NG : Check and repair harness and connector between combination meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ).
3. Check that MIL is illuminated. CHECK: Check that MIL is illuminated when turning the ignition switch ON. OK: MIL is illuminated OK : System OK. NG : Go to next step.
4. Check combination meter assy (MIL circuit). See the combination meter troubleshooting (See «INSPECTION»(ref-206210-S33025558992005112400000) ). NG : Repair or replace bulb or combination meter assembly. OK : Check and repair harness and connector between combination meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-206072-S25601918062005112300000) ).