Engine Controls - Diagnostics: Diagnosis Toyota RAV4 II рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the following procedure.

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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 on-board computer illuminates the Malfunction Indicator Lamp (MIL) on the instrument panel when the computer detects a malfunction in: 1) the emission control system/components, or 2) the powertrain 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-180979-S19974899352005073000000) ). If the malfunction does not reoccur in 3 consecutive trips, the MIL turns 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) on 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 (for operating instructions, see the OBD II scan tool's instruction book). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set as prescribed by the SAE, while manufacturer controlled codes can be set freely by a manufacturer within the prescribed limits (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). 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 5 ). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate (2nd trip). 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 determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred. 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 (DTC P0171, P0172) and misfire (DTC P0300 - P0304). Fuel trim malfunction (DTC P0171, P0172). Misfire (DTC P0300 - P0304).
2. CHECK 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. TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 7 (Bus + line) - 5 (Signal ground) During communication Pulse generation 4 (Chassis ground) - Body ground Constant Below 1 ohm 5 (Signal ground) - Body ground Constant Below 1 ohm 16 (B+) - Body ground Constant 9 to 14 V HINT: Connect the cable of the hand-held tester or the OBD II scan tool to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester or the OBD II scan tool. 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 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.
3. INSPECT BATTERY VOLTAGE Battery voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding.
4. CHECK MIL The MIL turns 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 MALFUNCTION»(ref-180979-S40851100382005073000000) ). When the engine is started, the MIL should turn off. If the lamp remains on, it means that the diagnosis system has detected a malfunction or abnormality in the system.
5. DTC CHECK (Normal Mode) NOTE: If there is no DTC in the normal mode, check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool or the hand-held tester. Hand-held tester only: When the diagnosis system is switched from the normal mode to the check mode, all the DTCs and freeze frame data recorded in the normal mode will be erased. So before switching modes, always check the DTCs and freeze frame data, and then write them down. Checking DTCs using the hand-held tester or OBD II scan tool. Connect the hand-held tester or the OBD II scan tool to DLC3. Turn the ignition switch ON. Use the hand-held tester or the OBD II scan tool to check the DTCs and freeze frame data and then write them down. For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. For the OBD II scan tool, see its instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check for DTCs, use the normal mode. For DTCs subject to "2 trip detection logic", perform either of the following actions. 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 lights up and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clearing the DTCs using the hand-held tester or the OBD II scan tool. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data using the hand-held tester or the OBD II scan tool (complying with SAE J1978). For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs without using the hand-held tester or the OBD II scan tool. Remove the EFI1 fuse from the engine room J/B and ETCS fuse from the engine room R/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 (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article).
6. 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. Procedure for Check Mode using the hand-held tester. 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 hand-held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE. Make sure the MIL flashes as shown in the illustration. NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF. Start the engine. The MIL should turn off after the engine starts. Simulate the conditions of the malfunction described by the customer. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data. After checking the DTC, inspect the applicable circuit. Clearing the DTCs using the hand-held tester or the OBD II scan tool. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the hand-held tester or the OBD II scan tool (complying with SAE J1978) For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs not using the hand-held tester or the OBD II scan tool. Remove the EFI1 fuse from the engine room J/B and ETCS fuse from the engine room R/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 (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article).
7. FAIL-SAFE CHART If any of the following codes are recorded, the ECM enters the fail-safe mode.
8. 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 the 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 5 ). Set the check mode (see step 6 ). Perform a simulation test (see SYMPTOM SIMULATION under «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-180907-S41160105272005073000000) in INTRODUCTION article). Check the connector and terminal (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). Wiggle the harness and connector (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article).
9. 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 flow chart, the location causing the problem can be found quickly and efficiently. Therefore, using this check is essential in the engine troubleshooting.

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1. Is battery positive voltage 11 V or more when engine stopped? NO : Charge or replace battery. YES : Go to next step.
2. Is engine cranked? NO : Proceed to «STARTERS»(ref-163469) article and continue to troubleshoot. YES : Go to next step.
3. Does engine start? NO : Go to step 6 . YES : Go to next step.
4. Check air filter. PREPARATION: Remove the air filter. CHECK: Visually check if air filter is contaminated with dirty or oily. NG : Repair or replace. OK : Go to next step.
5. Check idle speed. PREPARATION: Warm up the engine to the normal operating temperature. Switch off all the accessories. Switch off the A/C. Shift the transmission into the N position. Connect the hand-held tester or OBD II scan tool to the DLC3 of the vehicle. CHECK: Use CURRENT DATA to check the idle speed. OK: Idle speed: M/T: 650 to 750 RPM A/T: 550 to 750 RPM NG : Proceed to «PROBLEM SYMPTOMS TABLE»(ref-180979-S31242948742005073000000) . OK : Go to next step.
6. Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). NG : Proceed to Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) and continue to troubleshoot. OK : Go to next step.
7. Check for spark. PREPARATION: Disconnect the ignition coil. Remove the spark plug. Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: Do not crash the electrode gap. To prevent the injectors from injecting excess fuel during this test, do not crank the engine for more than 5 seconds at one time. NG : Proceed to «ON-VEHICLE INSPECTION»(ref-181263-S28905946212005073100000) in IGNITION article and continue to troubleshoot. OK : Proceed to «PROBLEM SYMPTOMS TABLE»(ref-180979-S31242948742005073000000) .
8. 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 the 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 or the OBD II scan tool. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST. According to the display on tester, read the "DATA LIST".
9. ACTIVE TEST HINT: Performing the hand-held tester ACTIVE TEST allows relay, VSV, actuator and other items to be operated without removing any parts. Performing the ACTIVE TEST early in troubleshooting is one way to shorten labor time. The DATA LIST can be displayed 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. Turn ON 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.
10. DEFINITION OF TERMS
11. 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 Adsorptive Catalyst (HCAC) system, HC adsorptive three-way catalyst HC adsorptive three-way catalytic converter Variable valve timing sensor, VVT sensor Camshaft position sensor Variable valve timing system, VVT system Camshaft timing control system Camshaft timing oil control valve, Oil control valve, OCV, VVT, VSV Camshaft timing oil control valve Variable timing and lift, VVTL Camshaft timing and lift control Crankshaft position sensor "A" Crankshaft position sensor Engine speed sensor Crankshaft position sensor THA Intake air temperature Knock control module Engine knock control module Knock sensor Engine knock sensor Mass or volume air flow circuit Mass air flow sensor circuit Vacuum sensor Manifold air pressure sensor Internal control module, Control module, Engine control ECU, PCM Power train control module FC idle Deceleration fuel cut Idle air control valve Idle speed control CCV, Canister close valve VSV for canister control Evaporative emissions canister vent valve EVAP VSV, Vacuum switching valve assembly No. 1, EVAP VSV, Purge VSV Evaporative emissions canister purge valve 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
12. List of Disable a Monitor 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" make, when the DTC on the left is stored detection of the DTC in the upper column is not performed.
13. 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 OBDII scantool. 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 scantool 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 / CARB OBDII / O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed. Select the desired O2S and press ENTER. The following screen will appear. 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 CHART TEST ID Description of TEST DATA Conversion Factor Unit Standard Value $81 Percentage of monitoring time when the O2S voltage is less than 0.05 V Multiply 0.3906 % Within 60 %
14. 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»(ref-180979-S23621775662005073000000) ). 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 READINESS TESTS The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components, and report any detected abnormalities with Diagnostic Trouble Codes (DTCs). Since various components need to be monitored during different driving conditions, the OBD II system runs separate monitoring programs called readiness monitors. The hand-held tester's software must be version 9.0 or newer to view the readiness monitor status. From the "Enhanced OBD II Menu", select "Monitor Status" to view the readiness monitor status. A generic OBD II scan tool can also be used to view the readiness monitor status. When the readiness monitor status reads "complete", the necessary conditions have been met for running performance tests for that readiness monitor. HINT: Many state Inspection and Maintenance (I/M) programs require a vehicle's readiness monitor status to show "complete". The Readiness Monitor will be reset to "incomplete" if: The ECM has lost battery power or blown a fuse DTCs have been cleared. The conditions for running the Readiness Monitor have not been met. If the readiness monitor status shows "incomplete", follow the appropriate readiness monitor drive pattern to change the status to "complete". CAUTION: Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns. NOTE: The following drive patterns are the fastest method of completing all the requirements necessary for making the readiness monitor status read "complete". If forced to momentarily stop a drive pattern due to traffic or other factors, the drive pattern can be resumed. Upon completion of the drive pattern, in most cases, the readiness monitor status will change to "complete". Sudden changes in vehicle load and speed, such as driving up and down hills and / or sudden acceleration, hinder readiness monitor completion.
2. CATALYST MONITOR (A/F sensor TYPE) Preconditions The monitor will not run unless: The MIL is OFF. Engine Coolant Temperature (ECT) is 75°C (167°F) or greater. Intake Air Temperature (IAT) is -10°C (14°F) or greater* NOTE: The readiness test can be completed in cold ambient conditions (less than -10°C/14°F) and / or high altitudes (more than 2,450 m / 8,000 feet). Finish the drive pattern, turn the ignition switch OFF and then on again, and repeat the drive pattern a second time. Drive Pattern Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to step " a "). Drive the vehicle at 64 to 88 km/h (40 to 55 mph) for approximately 4 minutes. NOTE: Drive with smooth throttle operation and avoid sudden acceleration. If IAT is less than 10°C (50°F) when the engine was started, drive the vehicle at 64 to 88 km/h (40 to 55 mph) for an additional 4 minutes. Drive the vehicle allowing speed to fluctuate between 64 to 80 km/h (40 to 50 mph) for about 16 minutes. NOTE: Drive with smooth throttle operation and avoid sudden closure of the throttle. Check the status of the readiness monitor on the scan tool display. If the readiness monitor status did not switch to "complete", ensure preconditions are met, turn the ignition switch OFF, and then repeat steps 2 and 3 .
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: The MIL is OFF Fuel level is approximately 1/2 to 3/4 fuel. Altitude is 2,450 m (8,000 feet) or less. Cold Soak Procedure Let vehicle cold soak for 8 hours or until "IAT - ECT" must be -7°C (-13°F) to 11.1°C (20°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 "IAT - ECT" is less 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 "IAT - ECT" is -7°C (-13°F) and 11.1°C (20°F). Preconditions The monitor will not run unless: The MIL is OFF Fuel level is approximately 1/2 to 3/4 fuel. The altitude is 2,450 m (8,000 feet) or less* Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F) Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)* The 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) NOTE: The readiness test can be completed in cold ambient conditions (less than 4.4°C / 40°F) and / or high altitudes (more than 2,450 m / 8,000 feet). Finish the drive pattern, turn the ignition switch OFF and then on again, and repeat the drive pattern a second time. Drive Pattern Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to step " a "). Release pressure in fuel tank by removing the fuel tank cap and then reinstalling it. Start the engine and allow to idle until ECT is 75°C (167°F) or more. Run the engine at 3,000 RPM for about 10 seconds. With the engine idling, turn the A/C ON to create slight electrical load. Wait 15 to 50 minutes. NOTE: If the vehicle is not equipped with A/C, put a slight load on the engine by doing the following: Set the parking brake securely. Use wheel chocks to secure the tires. Move the shift lever to drive (position D) and allow the engine to idle for 15 to 50 minutes. Check the readiness monitor status.
4. OXYGEN / AIR FUEL RATIO SENSOR MONITOR (FRONT A/F SENSOR AND REAR O2S SYSTEM) Preconditions The monitor will not run unless: The MIL is OFF Drive Pattern Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to step " a "). Start the engine and allow it to idle for 2 minutes or more. Drive the vehicle at 64 to 112 km/h (40 to 70 mph) for at least 150 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more. Drive the vehicle at 40 to 64 km/h (25 to 40 mph) for at least 40 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more Perform steps 5 and 6 10 times. Check the readiness monitor status. If the readiness monitor status did not change to "complete", check the preconditions, turn the ignition switch OFF, and repeat steps 1 to 6 .
5. OXYGEN / A/F SENSOR HEATER MONITOR Preconditions The monitor will not run unless: The MIL is OFF Drive Pattern Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions (refer to step " a "). Start the engine and allow it to idle for 500 seconds or more. Drive the vehicle at 40 km/h (25 mph) or more at least 2 minutes. Check the readiness monitor status. If the readiness monitor status did not change to "complete", check preconditions, turn the ignition switch OFF, and repeat steps 2 and 3 .

DIAGNOSTIC TROUBLE CODE CHART

HINT

Parameters listed in the chart may not be exactly the same as your readings 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 code listed in the table below. For details of each code, refer to the respective "DTC No." in the DTC chart.

DIAGNOSTIC TROUBLE CODES

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HINT

Each ECM terminal's standard voltage is shown in the table below.

In the table, first follow the information under "Condition". Next look under "Symbols (Terminal No.)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Specified Condition".

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 intake air volume, throttle position and engine coolant temperature.

The ECM controls the OCV based on the signals output from several sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft is optimized. Also, the engine torque improves, fuel economy improves, and exhaust emissions decrease. The ECM detects the actual valve timing using signals from the camshaft position sensor and the crankshaft position sensor. The ECM performs feedback control and verifies target valve timing.

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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, and other data from the time the malfunction occurred.

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1. Check operation of VVT system. PREPARATION: Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1. CHECK: Check the engine speed when operating the OCV by using the hand-held tester. OK: VVT system is OFF (OCV is OFF): Normal engine speed VVT system is ON (OCV is ON): Rough idle or engine stalled OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). NG : Go to next step.
2. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery positive voltage to 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 OC1+ and OC1- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE During idling, check the waveform between terminals OC1+ and OC1- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
4. Check for open and short in wire harness between OCV and ECM (see «DTC P0011: CAMSHAFT POSITION "A" -TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), DTC P0012: CAMSHAFT POSITION "A" -TIMING OVER-RETARDED (BANK 1)»(ref-180979-S36891948522005073000000) ). NG : Repair or replace. OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).

Scheme 62

1. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery positive voltage to 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 OC1+ and OC1- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE During idling, check the waveform between terminals OC1+ and OC1- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
3. Check for open and short in wire harness between OCV and ECM (see «DTC P0011: CAMSHAFT POSITION "A" -TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1), DTC P0012: CAMSHAFT POSITION "A" -TIMING OVER-RETARDED (BANK 1)»(ref-180979-S36891948522005073000000) ). NG : Repair or replace harness and connector. OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).

Scheme 63

HINT

1. If DTC P0011 or P0012 is displayed, check the VVT system circuit.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 64

1. Check valve timing (check for loose or jumped tooth of timing chain) (see «INSTALLATION»(ref-181073-S01524243892005073000000) ). 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 ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1 CHECK: Check the engine speed when operating the OCV using the hand-held tester. OK: OCV is OFF: Normal engine speed OCV is ON: Rough idle or engine stall OK : Go to step 4 NG : Go to next step.
3. Check if DTC outputs reoccur. PREPARATION: Erase the DTC(s) using one of the following methods: 1) use the hand-held tester, 2) disconnect the battery terminals for more than 60 seconds, or 3) remove the EFI1 and ETCS fuses for more than 60 seconds. HINT: After disconnecting the battery terminals, perform the "INITIALIZE" procedure (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article). Start the engine and warm it up. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the hand-held tester. OK: DTC P0011 or P0012 is not stored. OK : VVT system is OK.* HINT: *: 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 OC1+ and OC1- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE During idling. Check the waveform between terminals OC1+ and OC1- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
5. Check OCV filter (see «DISASSEMBLY»(ref-181073-S20417839632005073000000) . ). NG : Replace OCV filter. OK : Go to next step.
6. Check OCV (see «INSPECTION»(ref-239091-S08556077972006072600000) ). OK : Go to step 8 . NG : Go to next step.
7. Replace OCV (see «COMPONENTS»(ref-239091-S11721066352006072600000) ). GO: Go to next step.
8. Check VVT controller assembly (see «INSPECTION»(ref-181073-S33372160862005073000000) ). OK : Go to step 10 . NG : Go to next step.
9. Replace VVT controller assembly. GO: Go to next step.
10. Check blockage of OCV and oil hole. NG : Repair or replace. OK : Go to next step.
11. Check whether or not DTC P0011 or P0012 is stored. PREPARATION: Erase the DTC(s) using one of the following methods: 1) use the hand-held tester, 2) disconnect the battery terminals for more than 60 seconds, or 3) remove the EFI1 and ETCS fuses for more than 60 seconds. HINT: After disconnecting the battery terminals, perform the "INITIALIZE" procedure (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article). Perform the simulation test (see SYMPTOM SIMULATION under «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-180907-S41160105272005073000000) in INTRODUCTION article). CHECK: Check whether or not DTC P0011 or P0012 is stored (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). OK: DTC P0011 or P0012 is not stored. OK : VVT system is OK.* HINT: *: 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 65

Scheme 66

1. Check valve timing (check for loose or jumped tooth of timing chain) (see «INSTALLATION»(ref-181073-S01524243892005073000000) ). 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 the positive battery voltage between the terminals of the OCV. RESULT: 2 : Go to step 4 . 1
3. Check if DTC outputs reoccur. PREPARATION: Erase the DTC(s) using one of the following methods: 1) use the hand-held tester, 2) disconnect the battery terminals for more than 60 seconds, or 3) remove the EFI1 and ETCS fuses for more than 60 seconds. HINT: After disconnecting the battery terminals, perform the "INITIALIZE" procedure (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article). Start the engine and warm it up. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the hand-held tester. OK: DTC P0011 or P0012 is not stored. OK : VVT system is OK.* HINT: *: 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 OC1+ and OC1- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, and check the waveform between terminals OC1+ and OC1- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
5. Check OCV filter (see «INSPECTION»(ref-239091-S08556077972006072600000) ). NG : Replace OCV filter. OK : Go to next step.
6. Check OCV (see «INSPECTION»(ref-239091-S08556077972006072600000) ). NG : Replace OCV, and then go to step 7. OK : Go to next step.
7. Check VVT controller assembly (see «INSPECTION»(ref-181073-S33372160862005073000000) ). NG : Replace VVT controller assembly, and then go to step 8. OK : Go to next step.
8. Check blockage of OCV and oil hole. NG : Repair or replace. OK : Go to next step.
9. Check whether or not DTC P0011 or P0012 is stored. PREPARATION: Erase the DTC (s) using one of the following methods: 1) use the hand-held tester, 2) disconnect the battery terminals for more than 60 seconds, or 3) remove the EFI1 and ETCS fuses for more than 60 seconds. HINT: After disconnecting the battery terminals, perform the "INITIALIZE" procedure (see «PRE-CHECK»(ref-180980-S41701482092005073000000) in Automatic Transaxle Diagnostics article). Perform the simulation test (see SYMPTOM SIMULATION under «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-180907-S41160105272005073000000) in INTRODUCTION article). CHECK: Check whether or not DTC P0011 or P0012 is stored (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). OK: DTC P0011 or P0012 is not stored. OK : VVT system is OK.* HINT: *: 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Refer to DTC CIRCUIT DESCRIPTION under DTC P0335: CRANKSHAFT POSITION SENSOR "A" CIRCUIT MALFUNCTION, DTC P0339: CRANKSHAFT POSITION SENSOR "A" CIRCUIT INTERMITTENT.

Scheme 67

HINT

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

1. Check valve timing (check for loose or jumped tooth of timing chain) (see «INSTALLATION»(ref-181073-S01524243892005073000000) ). NG : Adjust valve timing. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

HINT

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

Scheme 68

Scheme 69

1. Check resistance of A/F sensor heater (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
2. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
3. Check voltage between terminal HA1A of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal HA1A of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
4. Check for open and short in wire harness between EFI main relay and A/F sensor, and A/F sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Refer to CIRCUIT DESCRIPTION under DTC P0136: OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2).

HINT

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

Scheme 70

Scheme 71

HINT

Sensor 2 refers to the farther sensor 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, and other data from the time the malfunction occurred.

Scheme 72

Scheme 73

1. Check resistance of heated oxygen sensor heater (see «INSPECTION»(ref-239091-S22135166122006072600000) ). NG : Replace heated oxygen sensor. OK : Go to next step.
2. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
3. Check voltage between terminals HT1B of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal HT1B of the ECM connector and body ground. HINT: Connect terminal HT1B to bank 1 sensor 2. OK: Voltage: 9 to 14 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
4. Check for open and short in wire harness between EFI main relay and heated oxygen sensor, and heated oxygen sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

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

By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is proportional to the airflow through the sensor. The ECM interprets this voltage as the intake air amount.

The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.

Scheme 74

The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit with the power transistor, and the potential of A and B remains equal to maintain the set temperature.

Scheme 75

HINT

After confirming DTC P0100, P0102 or P0103, use the hand-held tester or the OBD II scan tool to confirm the MAF ratio from the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL.

Scheme 76

HINT

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

Scheme 77

Scheme 78

Scheme 79

1. Connect hand-held tester or OBD II scan tool and read value of air flow rate. PREPARATION: Connect the hand-held tester or OBD II scan tool to the DLC3. Start the engine. 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 / DATA LIST / ALL / MAF. CHECK: Read the mass air flow rate on the OBD II scan tool or the hand-held tester. RESULT: MASS AIR FLOW RATE CHECK RESULT Air Flow Rate (gm/s) Proceed to 0.0 Type I 271.0 or more Type II Between 1 and 270.0 (1) Type III (1) The value must be changed when the throttle valve is opened or closed. Type II : Go to step 5 . Type III : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). Type I: Go to next step.
2. Check voltage of MAF meter power source. PREPARATION: Disconnect the MAF meter connector. Turn the ignition switch ON. CHECK: Measure the voltage between terminal 1 of the MAF meter connector and body ground. OK: Voltage: 9 to 14 V NG : Check for open in harness and connector between EFI main relay and MAF meter (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Go to next step.
3. Check voltage between terminal VG and EVG of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Start the engine. CHECK: Measure the voltage between terminal VG and EVG of the ECM connector while the engine is idling. OK: Voltage: 0.5 to 3.0 V (Neutral position and A/C switch OFF) OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
4. Check for open and short in wire harness between MAF meter and ECM, and between the MAF meter and EFI main relay (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace MAF meter.
5. Check resistance between terminal EVG of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). CHECK: Check the resistance between terminal EVG of the ECM connector and body ground. OK: Resistance: Below 1 ohm NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
6. Check for open in wire harness between MAF meter and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace MAF meter.

Refer to CIRCUIT DESCRIPTION under DTC P0100: MASS OR VOLUME AIR FLOW CIRCUIT MALFUNCTION, DTC P0102: MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT, DTC P0103: MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT.

Scheme 80

HINT

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

1. Are there any other codes (besides DTC P0101) being output? NO : Replace MAF meter. YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ).

The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (Scheme 16)

The IAT sensor is connected to the ECM (see below). The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA (THAR) via resistor R.

That is, the resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes in accordance with changes in the IAT, the voltage 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 81

Scheme 82

HINT

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

TEMPERATURE DISPLAYING

HINT

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

Scheme 83

Scheme 84

Scheme 85

Scheme 86

1. Connect hand-held tester or OBD II scan tool, and read value of intake air temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Same value as the actual air intake temperature. HINT: If there is open circuit, hand-held tester or OBD II scan tool indicates -40°C (-40°F). If there is short circuit, hand-held tester or OBD II scan tool indicates 140°C (284°F) or more. NG : -40°C (-40°F) ..... Go to step 2. 140°C (284°F) or more ..... Go to step 4 . OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).
2. Check for open in harness or ECM. PREPARATION: Disconnect the MAF meter connector. Connect the terminals THA and E2 of the MAF meter wire harness side connector. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK : Confirm good connection at sensor. If OK, replace MAF meter. NG : Go to next step.
3. Check for open in harness or ECM. PREPARATION: Disconnect the MAF meter connector. Connect terminals THA and E2 of the ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECU connector. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK : Open in harness between terminals E2 or THA, repair or replace harness. NG : Confirm good connection at ECM. If OK, replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the MAF meter connector. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK : Replace MAF meter. NG : Go to next step.
5. Check for short in harness or ECM. PREPARATION: Disconnect the E6 ECM connector. Connect the hand-held tester or the OBD II scan tool to the DLC3. HINT: The MAF meter connector is disconnected. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK : Repair or replace harness and connector. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

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

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

HINT

If the ECM detects the DTC "P0115, P0117 or P0118", it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).

Scheme 87

HINT

After confirming DTC "P0115, P0117 or P0118", use the hand-held tester or the OBD II scan tool to confirm the engine coolant temperature from the DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL.

TEMPERATURE DISPLAY

HINT

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

Scheme 88

Scheme 89

Scheme 90

Scheme 91

1. Connect hand-held tester or OBD II scan tool and read value of engine coolant temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Same value as the actual engine coolant temperature. HINT: If there is open circuit, hand-held tester or OBD II scan tool indicates -40°C (-40°F). If there is short circuit, hand-held tester or OBD II scan tool indicates 140°C (284°F) or more. NG : -40°C (-40°F) ..... Go to step 2. 140°C (284°F) or more ..... Go to step 4 . OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).
2. Check for open in harness or ECM. PREPARATION: Disconnect the ECT sensor connector. Connect terminals 1 and 2 of the ECT sensor wire harness side connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. 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: Disconnect the ECT sensor connector. Connect terminals THW and E2 of the ECM connector. HINT: Before checking, perform a visual and contact pressure check for the ECU connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK : Open in harness between terminals E2 or THW, repair or replace harness. NG : Confirm good connection at ECM. If OK, replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the ECT sensor connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK : Replace ECT sensor. NG : Go to next step.
5. Check for short in harness or ECM. PREPARATION: Disconnect the E6 ECM connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the hand-held tester or OBD II scan tool main switch ON. On the hand-held tester or OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK : Repair or replace harness and connector. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Refer to CIRCUIT DESCRIPTION under DTC P0115: ENGINE COOLANT TEMPERATURE CIRCUIT, DTC P0117: ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT, DTC P0118: ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT.

Scheme 92

HINT

1. If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, the ECT sensor circuit may be open or shorted. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when the malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Replace ECT sensor.

HINT

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

Scheme 93

Scheme 94

1. Connect hand-held tester and read voltage for throttle position sensor data. PREPARATION: Connect the hand-held tester to DLC3. Turn ON the ignition switch. Push the hand-held tester main switch ON. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS and THROTTLE POS #2. CHECK: Read the voltage for the accelerator pedal position sensor data. RESULT: B : Go to step 2 . A : Go to next step.
2. Check for open and short in wire harness in VC, VTA1, VTA2 and E2 circuits between ECM and throttle position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
4. Replace throttle body (see «REMOVAL»(ref-239091-S26396867692006072600000) ). GO: Go to next step.
5. Check if DTC output reoccur. PREPARATION: Clear the DTC (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). Start the engine. Drive the engine at idle for 15 seconds or more. CHECK: Read the DTC output. OK: No DTC output. OK : System is OK. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

OBD II scan tool (excluding hand-held tester)

1. Check for open and short in wire harness in VC, VTA and E2 circuits between ECM and throttle position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
2. Check voltage between terminal VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 : Check for open and short in harness and connector between ECM and throttle position sensor (VTA or E2 line) (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Go to next step.
3. Replace throttle body (see «REMOVAL»(ref-239091-S26396867692006072600000) ). GO: Go to next step.
4. Check if DTC outputs reoccur. PREPARATION: Clear the DTC (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Check whether or not DTC P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135 are stored. NG : System is OK. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

HINT

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

Replace throttle body (see REMOVAL )

Refer to CIRCUIT DESCRIPTION under DTC P0115: ENGINE COOLANT TEMPERATURE CIRCUIT, DTC P0117: ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT, DTC P0118: ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT.

Scheme 95

HINT

1. If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, 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 OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. Are there any other codes (besides DTC P0125) being out put ? Read the DTCs using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT DISPLAY Display (DTC output) Proceed to Only "P0125" are output A "P0125" and other DTCs are output 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-180979-S19974899352005073000000) ). A : Go to next step.
2. Inspect thermostat (see «INSPECTION»(ref-181258-S14716789152005073100000) ). CHECK: Check the valve opening temperature of the thermostat. HINT: Also check that the valve is completely closed under opening temperature as above. NG : Replace (see «REMOVAL»(ref-181258-S34198662822005073100000) ). OK : Go to next step.
3. Check cooling system. CHECK: Check that there is a defect in the cooling system which causes overcool, such as abnormal radiator fan operation or modified cooling system. NG : Repair or replace cooling system. OK : Replace ECT 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, and other data from the time the malfunction occurred.

1. Check cooling system. CHECK: Check that there is a defect in the cooling system which causes overcool, such as abnormal radiator fan operation or modified cooling system. NG : Repair or replace cooling system. YES : Go to next step.
2. Check thermostat (see «INSPECTION»(ref-181258-S14716789152005073100000) ). CHECK: Check the valve opening temperature of the thermostat. HINT: Also check that the valve is completely closed under opening temperature as above. NG : Replace thermostat (see «REMOVAL»(ref-181258-S34198662822005073100000) ). YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

The heated oxygen sensor (HO2S) is used to monitor oxygen in the exhaust gas. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal "stoichiometric" ratio. The HO2S 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.

The HO2S generates a voltage between 0 and 1 volt in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes "Lean". The ECM determines Lean when the HO2S voltage is below 0.45 volts. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes "Rich". The ECM determines Rich when the HO2S voltage is above 0.45 volts.

Scheme 96

Scheme 97

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

HINT

Hand-held tester only

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

1. Perform the ACTIVE TEST / A/F CONTROL operation. HINT: The A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 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. Enter the following menus: 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: A/F sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: less than 3.0 V -12.5 % --> Lean output: more than 3.35 V Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: more than 0.55 V -12.5 % --> Lean output: less than 0.4 V

Note. The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay.

Scheme 98

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

For displaying the graph, enter "ACTIVE TEST / A/F CONTROL / USER DATA", select "AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then, press "F4".

HINT

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

Scheme 99

Scheme 100

1. Are there any other codes (besides DTC P0136) being output? HINT: If any other codes besides P0136 is output, perform the troubleshooting for those DTCs first. YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). NO : Go to next step.
2. Check output voltage of heated oxygen sensor. PREPARATION: Connect the hand-held tester or OBD II scan tool to the DLC3. After warm up the engine, race the engine at 2,500 RPM for 3 minutes. CHECK: Read the output voltage of the heated oxygen sensor when the engine is suddenly raced. HINT: Quickly accelerate the engine to 4,000 RPM 3 times by using the accelerator pedal. OK: Heated oxygen sensor output voltage: 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 heated oxygen sensor (heater resistance) (see «INSPECTION»(ref-239091-S22135166122006072600000) ). NG : Replace heated oxygen sensor. OK : Go to next step.
4. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
5. Check for open and short in wire harness between ECM and heated oxygen sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). Reference: Bank 1 Sensor 2 System Drawing NG : Repair or replace harness and connector. OK : Replace heated oxygen sensor.
6. Perform confirmation driving pattern. HINT: Clear all DTCs prior to perform the confirmation driving pattern. GO: Go to next step.
7. Is there DTC P0136 being output again? NO : Check for intermittent problems. 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 ideal stoichiometric air-fuel ratio. The signal from the A/F 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 short-term fuel trim varies from the central value due to individual engine differences, wear over time and changes in the operating environment. The long-term fuel trim is the overall fuel compensation for the short-term fuel trim variation from the central value.

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

Scheme 101

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 is recorded. The MIL then illuminates.

Scheme 102

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 the simulated fuel injection amount by the ECM affects the 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

The smoothed fuel trim leaning value is more than +38 % or less than -32 %. The ECM interprets this as a fault in the fuel system.

HINT

Hand-held tester only

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

1. Perform the ACTIVE TEST A/F CONTROL operation. HINT: The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 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. Enter the following menus: 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: A/F sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: Less than 3.0 V -12.5 % --> Lean output: More than 3.35 V Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: More than 0.55 V -12.5 % --> Lean output: Less than 0.4 V

Note. The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay at maximum.

Scheme 103

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

For displaying the graph, enter "ACTIVE TEST / A/F CONTROL / USER DATA", select "AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then, press "F4".

HINT

1. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
2. A high A/F sensor voltage could be caused by a rich air fuel mixture. Check the conditions that might cause the engine to run with a rich air fuel mixture.
3. A low A/F sensor voltage could be caused by a lean air fuel mixture. Check the conditions that might cause the engine to run with a lean air fuel mixture.

Scheme 104

Scheme 105

Scheme 106

1. Check air induction system (see «SFI SYSTEM»(ref-239091-S33576169842006072600000) ). CHECK: Check for vacuum leaks in the air induction system. NG : Repair or replace air induction system. OK : Go to next step.
2. Check connection of PCV hose. NG : Repair or replace PCV hose. OK : Go to next step.
3. Check injector injection (Injection and volume). Check fuel pressure (see «INSPECTION»(ref-239091-S20148931092006072600000) ). NG : Replace injector. OK : Go to next step.
4. Check MAF meter (see «INSPECTION»(ref-239091-S07082529412006072600000) ) and ECT sensor (see «INSPECTION»(ref-239091-S18705849802006072600000) ). NG : Repair or replace. OK : Go to next step.
5. Check for sparks and ignition (see «ON-VEHICLE INSPECTION»(ref-181263-S28905946212005073100000) in IGNITION article) NG : Repair or replace. OK : Go to next step.
6. Check fuel pressure (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). CHECK: Check the fuel pressure (high or low pressure). NG : Check and repair fuel pump, pressure regulator, fuel pipe line and filter. OK : Go to next step.
7. Check gas leaks in exhaust system. NG : Repair or replace. OK : Go to next step.
8. Connect hand-held tester or OBD II scan tool and read value for voltage output of A/F sensor. PREPARATION: Connect the hand-held tester or OBD II scan tool to the DLC 3. Warm up the A/F sensor with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the hand-held tester or OBD II scan tool. CHECK: Hand-held tester only: On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SNAPSHOT / MANUAL SNAPSHOT / USER DATA. Read the values. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow the engine to idle for 30 seconds. Engine is racing at Approx. 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully closed quickly. OK: Standard: Conditions (1) and (2) Voltage changes a little in the vicinity of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustration. Condition (3) A/F sensor voltage increase to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the illustration. HINT: Whenever the output voltage of the A/F sensor remains at approximately 3.3 V (0.660 V)* (see dwg. 2) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see dwg. 2) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 16 km/h (10 mph) to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of the A/F ratio sensor or ECM, you can obtain a constant voltage. *: Voltage when using the OBD II scan tool. OK : Go to step 16 . NG : Go to next step.
9. Check A/F sensor heater (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
10. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
11. Check for open and short in wire harness between ECM and A/F sensor (bank 1 sensor 1) (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). Reference: Bank 1 Sensor 1 System Drawing NG : Repair or replace harness and connector. OK : Go to next step.
12. Replace A/F sensor (see «COMPONENTS»(ref-239091-S25325850282006072600000) ). GO: Go to next step.
13. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1). HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO: Go to next step.
14. Are there DTCs P0171 and/or P0172 being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ) and perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1). NO : Go to next step.
15. Did vehicle run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : DTC P0171 or P0172 is caused by running out of fuel.
16. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1. HINT: Clear all DTCs prior to performing the confirmation driving pattern (refer to step 13 ). GO: Go to next step.
17. Are there DTCs P0171 and/or P0172 being output again? NO : Go to step 21 . YES : Go to next step.
18. Replace A/F sensor. GO: Go to next step.
19. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1. HINT: Clear all DTCs prior to performing the confirmation driving pattern (refer to step 13 ). GO: Go to next step.
20. Are there DTCs P0171 and/or P0172 being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ) and perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1. NO : Go to next step.
21. Did vehicle run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : DTC P0171 or P0172 is caused by running out of fuel.

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

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

Scheme 107

HINT

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

Reference: Inspection using an oscilloscope.

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

Scheme 108

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

1. The misfiring rate exceeds a threshold value and could cause emissions deterioration.
2. During the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approximately 20 to 50 misfire per 1,000 engine revolutions) occurs once.
3. After the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approximately 20 to 50 misfire per 1,000 engine revolutions) occurs 4 times.

The ECM blinks the MIL (MIL blinks immediately) if

1. Within 200 engine revolutions at a high RPM, the threshold for "percent of misfire causing catalyst damage" is reached once.
2. Within 200 engine revolutions at a normal RPM, the threshold for "percent of misfire causing catalyst damage" is reached 3 times (for the 2nd trip, reaching the threshold once will cause the MIL to flash).

Scheme 109

HINT

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

Scheme 110

Scheme 111

Scheme 112

1. Are there any other codes (besides DTC P0300, P0301, P0302, P0303 or P0304) being output? NG : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). OK : Go to next step.
2. Check wire harness and vacuum hose in engine room. CHECK: Check the connection conditions of the wire harness and connector. Check the piping 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 or OBD II scan tool and read number of misfire. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn ON the ignition switch and push the hand-held tester or the OBD II scan tool main switch ON. Start the engine. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL#1 - CYL#4. CHECK: Read the number of misfire on the hand-held tester or the OBD II scan tool. HINT: When a misfire is not reproduced, be sure to branch below based on the stored DTC. RESULT: CYLINDER MISFIRE REFERENCE High Misfire Rate Cylinder Proceed to 1 or 2 cylinders Type I More than 3 cylinders Type II Type II : Go to step 15 . Type I: Go to next step.
5. Check spark plug and spark of misfiring cylinder. PREPARATION: Disconnect the ignition coil. Remove the spark plug. CHECK: Check the spark plug type. Check the electrode for carbon deposits. Check the electrode gap. OK: Recommended spark plug: SPARK PLUG REFERENCE DENSO made SK20R11 NGK made IFR6A11 No large carbon deposit present. Not wet with gasoline or oil. Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.) Correct electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.) PREPARATION: Disconnect the ignition coil with igniter connector, and disconnect the ignition coil with igniter. Remove the spark plug. Install the spark plug to the ignition coil with igniter, and connect the ignition coil with igniter connector. Disconnect the injector connector. Ground the spark plug. CHECK: Check if sparks occur while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, do not crank the engine for more than 2 seconds at a time. 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: Disconnect the spark plug. Change the normal spark plug. Install the spark plug to the ignition coil with igniter. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, do not crank the engine for more than 2 seconds at a time. OK: Spark jumps across electrode gap. OK : Replace spark plug. NG : Go to next step.
7. Change normal ignition coil with igniter and check spark of misfiring cylinder. PREPARATION: Disconnect the ignition coil with igniter connector, and disconnect the ignition coil with igniter. Remove the spark plug. Change normal ignition coil with igniter. Install the spark plug to the ignition coil with igniter, and connect the ignition coil with igniter connector. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, do not crank the engine for more than 2 seconds at a time. OK: Spark jumps across electrode gap. OK : Replace ignition coil with igniter, then confirm that there is no misfire. NG : Go to next step.
8. Check for open and short in wire harness between ignition coil and ECM of misfiring cylinder (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Replace ignition coil with igniter. NG : Repair or replace harness and connector.
9. Check voltage of ECM terminal for injector of failed cylinder. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between applicable terminal of the ECM connector and body ground. OK: Voltage: 9 to 14 V Reference: INSPECTION USING OSCILLOSCOPE With the engine idling, check the waveform between terminals #1 - #4 and E01/E02 of the ECM connector. HINT: The correct waveform is as shown in the illustration. OK : Go to step 12 . NG : Go to next step.
10. Check resistance of injector of misfiring cylinder (see «ON-VEHICLE INSPECTION»(ref-239091-S25587674692006072600000) ). NG : Replace injector. OK : Go to next step.
11. Check for open and short in wire harness between ignition switch and injector, and injector and ECM of misfiring cylinder (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
12. Check injector injection and volume of misfiring cylinder (see «INSPECTION»(ref-239091-S20148931092006072600000) ). NG : Replace injector. OK : Go to next step.
13. Check compression pressure of misfiring cylinder (see «INSPECTION»(ref-181073-S37267114062005073000000) ). NG : Repair or replace. OK : Go to next step.
14. Check valve clearance of misfiring cylinder (see «ADJUSTMENT»(ref-181073-S27024977482005073000000) ). NG : Adjust valve clearance. OK : Go to next step.
15. Switch step by number of misfire cylinders (refer to result of step 4). HINT: If the result of step 4 is "1 or 2 cylinders", proceed to A. If the result of step 4 is "more than 3 cylinders", proceed to B. B : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). A : Go to next step.
16. Check valve timing (Check for loose and jumped tooth of timing chain) (see «INSPECTION»(ref-181073-S38458188432005073000000) ). NG : Adjust valve timing (Replace timing chain). OK : Go to next step.
17. Check fuel pressure (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). NG : Check and repair fuel pump, pressure regulator, fuel pipe line and filter (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). OK : Go to next step.
18. Read value of hand-held tester or OBD II scan tool (intake air temperature and mass air flow rate). 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. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature: Equivalent to ambient temperature Check the mass air flow rate. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAF and read its value displayed on the hand-held tester or the OBD II scan tool. OK: AIR FLOW RATE CONDITION Condition Air Flow Rate (gm/s) Ignition switch ON (do not start engine) 0 Idling 0.5 to 5 Running without load (2,500 RPM) 3 to 10 Idling to quickly accelerating Air flow rate fluctuates NG : Replace MAF meter. OK : Go to next step.
19. Check ECT sensor (see «INSPECTION»(ref-239091-S18705849802006072600000) ). NG : Replace ECT sensor. OK : Go to next step.
20. Switch step by number of misfire cylinders (refer result of step). RESULT: CYLINDER MISFIRE HIGH RATE RESILIENCE High misfire rate cylinder Proceed to 1 or 2 cylinders A more than 3 cylinders B B : Go to step 5 . A : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).

A flat type knock sensor (non-resonant type) has the structure that can detect vibration in a wider band of frequency from approximately 6 kHz to 15 kHz and has the following features.

Knock sensor is fitted on the left side of the cylinder block to detect 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 113

HINT

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

Scheme 114

Scheme 115

Scheme 116

Scheme 117

1. Check DTC. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn ON the ignition switch and push the hand-held tester or the OBD II scan tool main switch ON. Warm up the engine. Run the engine at 3,000 RPM for 10 seconds or more. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. CHECK: Read the DTC. OK: DTC OUTPUT DISPLAY Display (DTC output) Proceed to Only P0325 is output again Type I P0325, P0327 and/or P0328 are output again Type II No DTCs are output again Type III Type II : Go to step 3 . Type III : Check for intermittent problems, (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). Type I: Go to next step.
2. Inspect knock sensor installation. CHECK: Check the knock sensor installation. Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) NG : Tighten knock sensor. OK : Replace knock sensor.
3. Check for open and short in wire harness between ECM and knock sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Go to step 5 . OK : Go to next step.
4. Check voltage between terminal KNK1 and EKNK of ECM connector. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals KNK1 and EKNK of the ECU connector. OK: Voltage: 4.5 to 5.5 V Reference: INSPECTION USING OSCILLOSCOPE HINT: The correct waveform is as shown in the illustration. ITEM CONTENTS Item Contents Terminal KNK1 - EKNK Equipment Set 0.01 to 10V/DIV. Equipment Set 0.01 to 10 msec./DIV. Condition After warming up the engine, keep engine speed 4,000 RPM NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Check for intermittent problems (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NOTE: Fault may be intermittent. Check the harness and connectors carefully.
5. Check knock sensor. PREPARATION: Disconnect the sensor connector. CHECK: Check the resistance between terminals 1 and 2 of the sensor. OK: Resistance: 120 to 280 kohm NG : Replace knock sensor. OK : Check and replace harness and connector.

The crankshaft position sensor (CKP) system consists of a crankshaft position sensor plate and a pickup coil.

The sensor plate has 34 teeth and is installed on the crankshaft. The pickup coil is made of an iron core and magnet. The sensor plate rotates and as each tooth passes through the pickup coil, a pulse signal is created. The pickup coil generates 34 signals for each engine revolution. Based on these signals, the ECM calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and ignition timing are controlled.

Scheme 118

HINT

1. 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. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD.
2. The engine speed can be confirmed in DATA LIST using the hand-held tester or OBD II scan tool. If there is no NE signals from the crankshaft position sensor despite the engine revolving, the engine speed will be indicated as zero. If voltage output of the crankshaft position sensor is insufficient, the engine speed will be indicated as lower PRM (than the actual RPM).
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 119

Scheme 120

1. Check resistance of crankshaft position sensor. CHECK: Measure the resistance between the terminals of the crankshaft position sensor. HINT: In the above section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F). OK: Resistance: 985 to 1,600 ohm at cold 1,265 to 1,890 ohm at hot Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check the waveform between the terminals of the ECM connector. ITEM CONTENTS Item Contents Terminal CH1: G2+ - NE- Terminal CH2: NE+ - NE- Equipment Set 5 V/DIV, 20 ms/DIV Condition During Cranking or idling HINT: The correct waveforms are as shown in the illustration. NG : Replace crankshaft position sensor. OK : Go to next step.
2. Check for open and short in wire harness between ECM and crankshaft position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
3. Check crankshaft position sensor installation (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). CHECK: Check the crankshaft position sensor installation. NG : Tighten sensor. OK : Go to next step.
4. Inspect crankshaft position sensor plate No. 1 (Teeth of signal plate). PREPARATION: Remove the crankshaft position sensor plate No. 1 (see «REMOVAL»(ref-181073-S29885524922005073000000) ). CHECK: Check the teeth of the sensor plate. NG : Replace crank shaft position sensor plate No. 1. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

The camshaft position (CMP) sensor, like the Crankshaft Position (CKP) sensor, consists of a magnet and an iron core wrapped in copper wire. The camshaft has 3 teeth and the CMP sensor is installed so that it can detect these teeth passing by. When the camshaft rotates and the teeth pass by the CMP sensor, the magnet on the CMP sensor creates a magnetic field and voltage is generated in the copper wire. When the crankshaft makes 2 rotation, voltage will be generated in the CMP sensor 3 times. The CKP sensor is roughly the same. When the crankshaft makes 1 rotation, its 34 teeth pass by the CKP sensor and voltage is generated 34 times. The camshaft rotates at half the speed of the crankshaft. Therefore, the CMP sensor generates voltage 3 times in the time the crankshaft takes to make 2 rotations.

The Engine Control Module (ECM) detects generation of these voltages to locate the camshaft position, which are used to indicate the cylinder.

Scheme 121

HINT

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

Scheme 122

Scheme 123

1. Check resistance of camshaft position sensor. CHECK: Measure the resistance between the terminals of the camshaft position sensor. HINT: In the above section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F). OK: Resistance: 835 to 1,400 ohm at cold 1,060 to 1,645 ohm at hot Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check the waveform between the terminals of the ECM connector. ITEM CONTENTS Item Contents Terminal CH1: G2+ - NE- Terminal CH2: NE+ - NE- Equipment Set 5V/DIV, 20ms/DIV Condition During Cranking or idling HINT: The correct waveforms are as shown in the left. NG : Replace camshaft position sensor. OK : Go to next step.
2. Check for open and short in wire harness between ECM and camshaft position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
3. Check camshaft position sensor installation. Inspect the camshaft position sensor installation. NG : Tighten sensor. OK : Go to next step.
4. Inspect camshaft. PREPARATION: Remove the camshaft (see «REMOVAL»(ref-181073-S29885524922005073000000) ). CHECK: Check the camshaft lobes. NG : Replace camshaft. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

HINT

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

Scheme 124

Scheme 125

Scheme 126

Scheme 127

Scheme 128

1. Check spark plug and spark of misfiring cylinder (see «ON-VEHICLE INSPECTION»(ref-181263-S28905946212005073100000) in IGNITION article). NG : Go to step 4 . OK : Go to next step.
2. Check for open and short in wire harness in IGF and IGT signal circuit between ECM and ignition coil with igniter (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Replace harness and connector. OK : Go to next step.
3. Disconnect ignition coil with igniter connector and check voltage between terminal IGF1 of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Disconnect the ignition coil with igniter connector. Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGF1 of the ECM connector and body ground. OK: Voltage: 4.5 to 5.5 V NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Replace ignition coil with igniter.
4. Check for open and short in wire harness in IGT signal circuit between ECM and ignition coil with igniter (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
5. Check voltage between terminals IGT1 to IGT4 of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). CHECK: Measure the voltage between terminals IGT1 to IGT4 of the ECM connector and the body ground when the engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check the waveform between terminals IGT1 to IGT4 and E1, and IGF1 and E1 of the ECM connector. HINT: The correct waveforms are as shown in the illustration. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
6. Disconnect ignition coil with igniter connector and check voltage between terminals IGT1 to IGT4 of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Disconnect the ignition coil with igniter connector. CHECK: Measure the voltage between terminals IGT1 to IGT4 of the ECM connector and the body ground when the engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 the body ground when the ignition switch is turned the to ON or 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 are wire harness between ignition switch and ignition coil with igniter (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and 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, and other data from the time the malfunction occurred.

1. Are there any other codes (besides P0420) being output? HINT: If any other codes besides P0420 are output, perform the troubleshooting for those DTCs first. YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). NO : Go to next step.
2. Check gas leakage in exhaust system. NG : Repair or replace. OK : Go to next step.
3. Check A/F sensor (bank 1 sensor 1) (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
4. Check heated oxygen sensor (bank 1 sensor 2) (see «INSPECTION»(ref-239091-S22135166122006072600000) ). NG : Replace heated oxygen sensor. OK : Go to next step.

Replace the front and rear three-way catalytic converter in bank malfunction is detected.

HINT

Hand-held tester only

The following procedure enables a technician to identify a trouble area if there is a malfunction in both front A/F sensor or rear heated oxygen sensor other than the catalyst converter, or the malfunction that indicates the actual air-fuel ratio extremely RICH or LEAN.

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

Perform ACTIVE TEST A/F CONTROL operation.

HINT

The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 25 %.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine with the engine speed at 2,500 RPM for approximately 90 seconds.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine idle (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. However, there is a few second delay in the sensor 1 (front sensor) output. And there is about 20 seconds delay in the sensor 2 (rear sensor).

Scheme 129

The following A/F CONTROL procedure enables a technician to check and graph the voltage output of the heated oxygen sensors (sensor 1 and 2).

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

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

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

DTCs P0441, P0446 and P2418 are recorded in the ECM when evaporative emissions leak from the components within the dotted line in Fig. (Scheme 130) below, or when there is a malfunction in both the EVAP VSV and pressure switching valve, or in the vapor pressure sensor itself.

Scheme 130

Scheme 131

Scheme 132

HINT

Typical DTC output of each trouble is shown below.

Scheme 133

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV), P2418 (Pressure Switching Valve) or P0451 (Evaporative Pressure Sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the 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 134

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

1. Check that fuel tank cap meets OEM specification. NG : Replace it with a cap that meets OEM specification. 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-239092-S25864458852006072600000) ). NG : Replace fuel tank cap. OK : Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually check the filler neck for damage. Reinstall the fuel tank cap. NG : Replace filler pipe. OK : Go to next step.
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Disconnect the EVAP VSV vacuum hose from the charcoal canister. Start the engine Select the item EVAP VSV (ALON) / ALL in the ACTIVE TEST and operate the 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, puncture, damage and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
7. Check operation of EVAP VSV (see «INSPECTION»(ref-239091-S32012513592006072600000) ). NG : Replace EVAP VSV. OK : Go to next step.
8. Check for open and short in wire harness between EFI main relay and EVAP VSV, and EVAP VSV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
9. Check CCV. PREPARATION: Disconnect the CCV vacuum hose from the charcoal canister. Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Select the item CAN CTRL VSV / ALL in the ACTIVE TEST and operate the CAN CTRL VSV (press the right or left button). CHECK: When the VSV is operated by the hand-held tester, check whether or not air flows from port E to F. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK : Go to step 13 . NG : Go to next step.
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, puncture, damage and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
11. Check operation of CCV (see «INSPECTION»(ref-239091-S06336913112006072600000) ). NG : Replace CCV. OK : Go to next step.
12. Check for open and short in wire harness between EFI main relay and CCV, and CCV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
13. Check pressure switching valve. PREPARATION: Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Select the item TANK BYPASS VSV / ALL in the ACTIVE TEST and operate the TANK BYPASS VSV (press the right or left button). CHECK: When the VSV is operated by the hand-held tester, check whether or not air flows from port E to F. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK : Go to step 16 . NG : Go to next step.
14. Check operation of pressure switching valve (see «INSPECTION»(ref-239091-S24278660942006072600000) ). NG : Replace pressure switching valve. OK : Go to next step.
15. Check for open and short in wire harness between EFI main relay and pressure switching valve, and pressure switching valve and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
16. Check whether hose close to fuel tank has been modified, and whether there are signs of any accident near fuel tank. CHECK: Check the following parts for cracks, deformation and loose connection: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG : Repair or replace evaporative emission leak part. OK : Go to next step.
17. Check vacuum hoses between vapor pressure sensor and fuel tank, and charcoal canister and VSV for 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, puncture and damage. NG : Repair or replace vacuum hose. OK : Go to next step.
18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection between the fuel tank and fuel EVAP pipe, fuel EVAP pipe and under-floor fuel tube, and under-floor fuel tube and charcoal canister. Check the hose and tube for cracks, puncture and damage. NG : Repair or replace hose and tube. OK : Go to next step.
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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. 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 OK : Go to step 22 . NG : Go to next step.
21. Check for open and short in wire harness between vapor pressure sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
22. Check fuel tank over fill check valve. NG : Replace fuel tank over fill check 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 and damage. NG : Replace charcoal canister. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

1. Check that fuel tank cap meets OEM specification. NG: Replace it with a cap that meets OEM specification. 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-239092-S25864458852006072600000) ). NG: Replace fuel tank cap. OK: Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually check 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 whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check the following parts for cracks, deformation and loose connection: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emissions 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, puncture and damage. NG: Repair or replace vacuum hose. OK: Go to next step.
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection between the fuel tank and fuel EVAP pipe fuel EVAP pipe and under-floor fuel tube and under-floor fuel tube and charcoal canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace hose and tube. OK: Go to next step.
8. Check vacuum hoses ((5), (6), (7), (8) and (9) in (Scheme 130) 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, puncture, damage, and blockage. NG: Repair or replace vacuum hose. OK: Go to next step.
9. Check EVAP VSV connector, CCV connector, pressure switching valve connector 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 (cracks, puncture and damage). NG: Check and replace charcoal canister. OK: Go to next step.
11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK: Go to next step.
12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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. 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 OK: Go to step 14. NG: Go to next step.
13. Check for open and short in wire harness between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace vapor pressure sensor.
14. Check EVAP VSV. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect terminal PRG of the ECM connector and body ground (ON). Disconnect terminal PRG from the 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 «INSPECTION»(ref-239091-S32012513592006072600000) ). NG: Replace EVAP VSV. OK: Go to next step.
16. Check for open and short in wire harness between EFI main relay and EVAP VSV, and EVAP VSV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
17. Check CCV. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect terminal CCV of the ECM connector and body ground (ON). Disconnect terminal CCV from the body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to next step.
18. Check operation of CCV (see «INSPECTION»(ref-239091-S06336913112006072600000) ). NG: Replace CCV. OK: Go to next step.
19. Check for open and short in wire harness between EFI main relay and CCV, and CCV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
20. Check pressure switching valve. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect terminal TBP of the ECM connector and body ground (ON). Disconnect terminal TBP from the 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. NG: Go to step 24. OK: Go to next step.
21. Check operation of pressure switching valve (see «INSPECTION»(ref-239091-S24278660942006072600000) ). NG: Replace pressure switching valve. OK: Go to next step.
22. Check for open and short in harness and connector between EFI main relay and pressure switching valve, and pressure switching valve and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness or connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
23. Check the fuel tank over fill check valve (see «INSPECTION»(ref-239092-S25864458852006072600000) ). NG: Replace fuel tank over fill check valve or fuel tank. OK: Go to next step.
24. Check fuel tank (see «INSPECTION»(ref-239092-S25864458852006072600000) ). NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

The vapor pressure sensor, 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, P0455 or P0456 is recorded in the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 146) below, or when the vapor pressure sensor malfunctions.

Scheme 146

Scheme 147

HINT

Refer to DTCs P0441, P0446 and P2418. See DTC P0441: EVAPORATIVE EMISSION CONTROL SYSTEM INCORRECT PURGE FLOW, DTC P0446: EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT, DTC P2418: EVAPORATIVE EMISSION SYSTEM VALVE CONTROL CIRCUIT/OPEN .

Scheme 148

HINT

Typical DTC output of each trouble is shown below.

Scheme 149

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV or Pressure switching valve) or P0451 (evaporative pressure sensor) is output with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Ask the customer whether, after the MIL is turned on, the customer found the fuel tank cap loose and tightened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not sure if it was loose, troubleshoot according to the following procedure.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
4. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 150

Scheme 151

Scheme 152

Scheme 153

Scheme 154

Scheme 155

1. Check that fuel tank cap meets OEM specification. NG : Replace it with a cap that meets OEM specification. 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-239092-S25864458852006072600000) ). NG : Replace fuel tank cap. OK : Go to next step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually check the filler neck for damage. Reinstall the fuel tank cap. NG : Replace filler pipe. OK : Go to next step.
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Disconnect the EVAP VSV vacuum hose from the charcoal canister. Start the engine Select the item EVAP VSV (ALON) / ALL in the ACTIVE TEST and operate the 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, puncture, damage and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
7. Check operation of EVAP VSV (see «INSPECTION»(ref-239091-S32012513592006072600000) ). NG : Replace EVAP VSV. OK : Go to next step.
8. Check for open and short in wire harness between EFI main relay and EVAP VSV, and EVAP VSV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
9. Check CCV. PREPARATION: Disconnect the CCV vacuum hose from the charcoal canister. Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Select the item CAN CTRL VSV / ALL in the ACTIVE TEST and operate the CAN CTRL VSV (press the right or left button). CHECK: When the VSV is operated by the hand-held tester, check whether or not air flows from port E to F. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK : Go to step 13 . NG : Go to next step.
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage, and blockage. NG : Repair or replace vacuum hose. OK : Go to next step.
11. Check CCV operation (see «INSPECTION»(ref-239091-S06336913112006072600000) ). NG : Replace CCV. OK : Go to next step.
12. Check for open and short in wire harness between EFI main relay and CCV, and CCV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
13. Check pressure switching valve. PREPARATION: Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST mode on the hand-held tester. Select the item TANK BYPASS VSV / ALL in the ACTIVE TEST and operate the TANK BYPASS VSV (press the right or left button). CHECK: When the VSV is operated by the hand-held tester, check whether or not air flows from port E to F. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK : Go to step 16 . NG : Go to next step.
14. Check pressure switching valve operation (see «INSPECTION»(ref-239091-S24278660942006072600000) ). NG : Replace pressure switching valve. OK : Go to next step.
15. Check for open and short in wire harness between EFI main relay and pressure switching valve, and pressure switching valve and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
16. Check whether hose close to fuel tank has been modified, and whether there are signs of any accident near fuel tank or charcoal canister CHECK: Check the following parts for cracks, deformation and loose connection: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG : Repair or replace evaporative emissions leak part. OK : Go to next step.
17. Check vacuum hoses between vapor pressure sensor and fuel tank, and charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, puncture and damage. NG : Repair or replace vacuum hose and tube. OK : Go to next step.
18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection between the fuel tank and fuel EVAP pipe, fuel EVAP pipe and under-floor fuel tube and under-floor fuel tube and charcoal canister. Check the hose and tube for cracks, hole and damage. NG : Repair or replace hose and tube. OK : Go to next step.
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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. 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 3.7V Voltage: 0.5 V or less OK : Go to step 22 . NG : Go to next step.
21. Check for open and short in wire harness between vapor pressure sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
22. Check fuel tank over fill check valve. NG : Replace fuel tank over fill check valve. OK : Go to next step.
23. Check fuel tank. NG : Replace fuel tank. OK : Go to next step.
24. Check charcoal canister for crack, puncture and damage. NG : Replace charcoal canister. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 156

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

1. Check that fuel tank cap meets OEM specification. NG: Replace it with a cap that meets OEM specification. 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-239092-S25864458852006072600000) ). 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. Reinstall the fuel tank cap. NG: Replace filler pipe. OK: Go to next step.
5. Check whether hose close to fuel tank have been modified, and 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, puncture and damage. NG: Repair or replace vacuum hose. OK: Go to next step.
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe, fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister (see «INSPECTION»(ref-239092-S25864458852006072600000) ). Check the hose and tube for cracks, puncture and damage. NG: Repair or replace hose and tube. OK: Go to next step.
8. Check vacuum hoses ((5), (6), (7) (8) and (9) in (Scheme 16) 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, puncture, damage and blockage. NG: Repair or replace vacuum hose. OK: Go to next step.
9. Check VSV connector for EVAP, VSV connector for CCV, VSV connector for pressure switching valve and vapor pressure sensor connector for looseness and disconnection. NG: Repair or connect VSV and sensor connector. OK: Go to next step.
10. Check charcoal canister for crack, puncture and damage. NG: Check and replace charcoal canister. OK: Go to next step.
11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the grove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK: Go to next step.
12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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. 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 OK: Go to step 14. NG: Go to next step.
13. Check for open and short in wire harness between vapor pressure sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
14. Check EVAP VSV. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal PRG of the ECM connector and body ground (ON). Disconnect between terminal PRG 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 «INSPECTION»(ref-239091-S32012513592006072600000) ). NG: Replace EVAP VSV. OK: Go to next step.
16. Check for open and short in wire harness between EFI main relay and EVAP VSV, and EVAP VSV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
17. Check CCV. PREPARATION: Remove the grove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal CCV of the ECM connector and body ground (ON). Disconnect between terminal CCV of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to next step.
18. Check operation of CCV (see «INSPECTION»(ref-239091-S06336913112006072600000) ). NG: Replace CCV. OK: Go to next step.
19. Check for open and short in wire harness between EFI main relay and CCV, and CCV and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
20. Check pressure switching valve. PREPARATION: Remove the grove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal TBP of the ECM connector and body ground (ON). Disconnect between terminal TBP 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 23. NG: Go to next step.
21. Check operation of pressure switching valve (see «INSPECTION»(ref-239091-S24278660942006072600000) ). NG: Replace pressure switching valve. OK: Go to next step.
22. Check for open and short in wire harness between EFI main relay and pressure switching valve, and pressure switching valve and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG: Repair or replace harness and connector. OK: Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
23. Check fuel tank over fill check valve. NG: Replace fuel tank over fill check valve. OK: Go to next step.
24. Check fuel tank. NG: Replace fuel tank. OK: Go to next step.
25. Check charcoal canister for crack, puncture and damage. NG: Replace charcoal canister. OK: It is likely that vehicle user did not properly close fuel tank cap.

The vapor pressure sensor, 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.

Scheme 162

HINT

1. If DTC P0441 (purge flow), P0446 (CCV), P2418 (pressure switching valve), P0451 (evaporative pressure sensor), P0452 (evaporative pressure sensor low input), or P0453 (evaporative pressure sensor low input) is output after DTC P0442 or P0456, first troubleshoot DTC P0441, P0446, P2418, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
4. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the EVAP VSV, charcoal canister and vapor pressure sensor.

Scheme 163

Scheme 164

1. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
2. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). 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. 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 : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). NG : Go to next step.
3. Check for open and short in wire harness between vapor pressure sensor and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and 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 165

Scheme 166

HINT

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

Scheme 167

Scheme 168

Scheme 169

1. Check operation of speedometer. CHECK: Drive the vehicle and check if 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. OK : Go to next step.
2. Check for short in wire harness between terminal SPD of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Disconnect the E7 connector from the ECM. CHECK: Check the resistance between terminal SPD of the ECM connector and body ground. OK: Resistance: 10 kohm or higher NG : Repair of replace harness and connector. OK : Go to next step.
3. Check voltage between terminal SPD of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Shift the shift lever to neutral. Jack up the vehicle. Turn the ignition switch ON. CHECK: Measure the voltage between terminal SPD of the ECM connector and the body ground when the wheel is turned slowly. OK: Voltage is generated intermittently. HINT: The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly. NG : Check and repair harness and connector between combination meter and ECM. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

In addition to turning on the stop light, the stop light switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks. It is important that the switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop light switch.

HINT

Normal condition is as shown in the table

BRAKE PEDAL

Scheme 170

Scheme 171

HINT

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

Scheme 172

1. Check operation of stop light CHECK: Check if the stop lights turn ON and OFF normally when the brake pedal is depressed and released. NG : Check and repair stop light circuit. OK : Go to next step.
2. Check stop light switch (see «INSPECTION»(ref-181026-S01303330992005073000000) ). NG : Replace stop light switch. OK : Go to next step.
3. Check STP and ST1- voltage. PREPARATION: Connect the hand-held tester to the DLC3. Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW. CHECK: Read the STP signal on the hand-held tester. Check the voltage between terminal STP and ST1- of the ECM connector and body ground. OK: BRAKE PEDAL Brake Pedal STP Signal ST1- Terminal Voltage Depressed ON Below 1.5 V Released OFF 7.5 to 14 V OK : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). NG : Go to next step.
4. Check for wire harness between ECM and stop light switch (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 173

1. Check operation of stop light. CHECK: Check if the stop lights turn ON and OFF normally when the brake pedal is depressed and released. NG : Repair stop light circuit. OK : Go to next step.
2. Check stop light switch (see «INSPECTION»(ref-181026-S01303330992005073000000) in STOPLIGHT SYSTEM article). NG : Replace stop light switch. OK : Go to next step.
3. Check STP and ST1- voltage. PREPARATION: Turn the ignition switch ON. CHECK: Check the voltage between terminal STP and ST1- of the ECM connector and body ground OK: STPV TERMINAL VOLTAGE Brake Pedal STP Terminal Voltage ST1- Terminal 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-180979-S17908463662005073000000) ). NG : Go to next step.
4. Check for wire harness between ECM and stop light switch (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

HINT

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

1. Are there any other codes (besides P0505) being output? HINT: If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first. YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). NO : Go to next step.
2. Check connection of PCV hose. NG : Repair or replace PCV hose. OK : Go to next step.
3. Check air induction system (see «SFI SYSTEM»(ref-239091-S33576169842006072600000) ). CHECK: Check for vacuum leaks in air induction system. NG : Repair or replace OK : Check ETCS (see «ON-VEHICLE INSPECTION»(ref-239091-S33097325992006072600000) ).

HINT

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

Scheme 174

Scheme 175

1. Check EFI1 and EFI2 fuse. PREPARATION: Remove the EFI1 and 2 fuses from the engine room J/B. CHECK: Check the resistance of the EFI1 and 2 fuses. OK: Resistance: Below 1 ohm NG : Replace fuse. OK : Go to next step.
2. Check voltage between terminal BATT of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). CHECK: Measure the voltage between terminal BATT of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
3. Check for open in wire harness between ECM and battery. NG : Repair or replace harness and 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, and other data from the time the malfunction occurred.

Replace ECM (see COMPONENTS ).

HINT

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

When the shift lever is in the N or P position: 1) the PNP switch turns on, and 2) ECM terminal NSW is grounded to the body ground via the starter relay and voltage becomes 0 V. When the shift lever is in the D, 2, L or R position: 1) the PNP switch turns off, and 2) ECM terminal NSW receives current and becomes the voltage of the ECM internal power source.

If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction and for idle speed control (estimated control).

Scheme 176

HINT

After confirming DTC P0705, use the hand-held tester to confirm the PNP switch signal in the ALL menu (to reach the ALL menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL).

Refer to DTC P0705 (see INSPECTION PROCEDURE under DTC: P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) in AUTOMATIC TRANSAXLE DIAGNOSTICS article).

HINT

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

The throttle actuator 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 actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

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

Scheme 177

HINT

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

1. Check throttle body (throttle actuator) (see «ON-VEHICLE INSPECTION»(ref-239091-S33097325992006072600000) ). NG : Replace throttle body. OK : Go to next step.
2. Check for open and short in wire harness between throttle actuator and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
3. Inspect throttle body (Visually check throttle valve). CHECK: Check for foreign objects between the throttle valve and the housing. Also, check if the valve can open and close smoothly. NG : Remove foreign objects and clean throttle body. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

The throttle actuator is operated by the ECM and 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 actuator and set the throttle valve angle in response to driver inputs.

HINT

This Electronic Throttle Control System (ETCS) dose not use a throttle cable.

Scheme 178

HINT

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

1. Is there DTC P2111 or P2112 being output. NG : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). OK : Go to next step.
2. Visually check throttle valve. PREPARATION: Remove the intake air duct. CHECK: Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body. And check that the throttle valve moves smoothly. OK: The throttle valve is not contaminated with foreign objects and can move smoothly NG : Replace throttle body. OK : Go to next step.
3. Check DTC output. PREPARATION: Start the engine, and depress and release the accelerator pedal quickly (fully open and fully close). Clear the DTC. CHECK: Read the DTC. RESULT: DTC CHECK Display (DTC output) Proceed to No DTC A P2111 and/or P2112 B B : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). A : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ).

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 4 V), the ECM concludes that the ETCS has a fault and current to the throttle actuator is cut.

When the voltage becomes unstable, the ETCS control condition itself becomes unstable. For this reason, when the voltage is low, the current to the actuator is cut. If repairs are made and the system has returned to normal and then the ignition switch is turned OFF, the ECM will be able to restart the actuator.

HINT

This ETCS does not use a throttle cable.

Scheme 179

Scheme 180

HINT

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

Scheme 181

Scheme 182

1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse from the engine room R/B. CHECK: Check the resistance of the ETCS fuse. OK: Resistance : Below 1 ohm NG : Replace ETCS fuse. OK : Go to next step.
2. Check voltage between terminal +BM of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). CHECK: Measure the voltage between terminal +BM of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
3. Check for open in wire harness between battery and ETCS fuse, and ETCS fuse and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Check and repair engine room R/B.

The Electronic Throttle Control System (ETCS) is composed of a throttle actuator 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 actuator 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 actuator.

Scheme 183

HINT

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

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 ON the ignition switch and push the hand-held tester or the OBD II scan tool main switch ON. On the 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 Display (DTC Output) Proceed to Only P2119 is output A P2119 and other DTC B HINT: If any codes other than P2119 are output, perform the troubleshooting for those DTCs first. B : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). A : Go to next step.
2. Check DTC output (Check if DTC outputs reoccur). PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-180979-S17908463662005073000000) ). Allow the engine to idle for 15 seconds. Pull the hand brake and shift the gear to D. Depress the brake pedal securely and the accelerator pedal fully for 5 seconds. CHECK: Read the output DTC. HINT: Accelerator pedal position (TP) sensor voltage can be confirmed using the hand-held tester (DATA LIST / ALL / THROTTLE POS #1). OK: No DTC is output. OK : System is OK. 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, and other data from the time the malfunction occurred.

Scheme 184

Scheme 185

Scheme 186

1. Connect hand-held tester and read voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn ON the ignition switch. Push the hand-held tester main switch. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: ACCELERATOR PEDAL Accelerator Pedal ACCEL POS #1 ACCEL POS #2 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 6 . NG : Go to next step.
2. Check accelerator pedal position sensor (see «INSPECTION»(ref-239091-S30681812332006072600000) ). NG : Replace accelerator pedal assembly. OK : Go to next step.
3. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
4. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector. OK: ACCELERATOR PEDAL VOLTAGE Accelerator Pedal Voltage Accelerator Pedal VPA - EPA VPA2 - EPA2 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
5. Check for open and short in wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Repair or replace. NG : Go to next step.
6. Read output DTC (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). OK : System is OK. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 187

Scheme 188

1. Check accelerator pedal assembly (accelerator pedal position sensor) (see «INSPECTION»(ref-239091-S30681812332006072600000) ). NG : Replace accelerator pedal assembly. OK : Go to next step.
2. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
3. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector. OK: ACCELERATOR PEDAL VOLTAGE Accelerator Pedal Voltage Accelerator Pedal VPA - EPA VPA2 - EPA2 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 «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
4. Check for open and short in wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Repair or replace harness and connector. NG : Go to next step.
5. Read output DTC (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). OK : System is OK. NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

HINT

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

Scheme 189

Scheme 190

1. Connect hand-held tester and read voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn ON the ignition switch. Push the hand-held tester main switch. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: ACCELERATOR PEDAL VOLTAGE Accelerator Pedal ACCEL POS #1 ACCEL POS #2 Released 0.5 to 1.1 V 1.5 to 2.9 V Depressed 2.5 to 4.6 V 3.5 to 5.5 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
2. Check accelerator pedal assembly (accelerator pedal position sensor) (see «INSPECTION»(ref-239091-S30681812332006072600000) ). NG : Replace accelerator pedal assembly. OK : Go to next step.
3. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector. OK: VOLTAGE Accelerator Pedal Voltage Accelerator Pedal VPA - EPA VPA2 - EPA2 Released 0.5 to 1.1 V 1.5 to 2.9 V Depressed 2.5 to 4.6 V 3.9 to 5.5 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
4. Check for open and short in wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Repair or replace. NG : Replace accelerator pedal assembly (see «COMPONENTS»(ref-239091-S03112123072006072600000) ).

Scheme 191

1. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector. OK: ACCELERATOR PEDAL VOLTAGE Accelerator Pedal Voltage Accelerator Pedal VPA - EPA VPA2 - EPA2 Released 0.5 to 1.1 V 1.5 to 2.9 V Depressed 2.5 to 4.6 V 3.9 to 5.5 V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
2. Check for open and short in wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). OK : Repair or replace. NG : Replace accelerator pedal assembly (see «SFI»(ref-180926) article).

HINT

Hand-held tester only

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

1. Perform the ACTIVE TEST A/F CONTROL operation.

HINT

The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 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 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 idle (press the right or left button). Result: A/F sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: less than 3.0 V -12.5 % --> Lean output: more than 3.35 V Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: more than 0.55 V -12.5 % --> Lean output: less than 0.4 V

Note. The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay.

Scheme 192

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

For displaying the graph, enter "ACTIVE TEST / A/F CONTROL / USER DATA", select AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then, press "F4".

HINT

1. A low A/F sensor voltage could be caused by a rich air fuel mixture. Check for conditions that might cause the engine to run with a rich air fuel mixture.
2. A high A/F sensor voltage could be caused by a lean air fuel mixture. Check for conditions that might cause the engine to run with a lean air fuel mixture.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 193

Scheme 194

Scheme 195

1. Are there any other codes (besides DTC P2195 and/or P2196) being output? HINT: If any other codes besides P2195 and/or P2196 are output, perform the troubleshooting for those DTCs first. YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). NO : Go to next step.
2. Connect hand-held tester or OBD II scan tool, and read value for voltage output of A/F sensor. PREPARATION: Connect the hand-held or the OBD II scan tool to the DLC3. Warm up the A/F sensor with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the hand-held tester or OBD II scan tool. CHECK: Hand-held tester only: On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SNAPSHOT / MANUAL SNAPSHOT / USER DATA. Read the values. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow engine to idle for 30 seconds. Engine is racing at approximately 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully quickly. OK: Standard: Conditions (1) and (2) Voltage changes a little in the vicinity of 3.3 V (between Approx. 3.1 - 3.5 V) as shown in the illustration. Condition (3) A/F ratio sensor voltage increases to 3.8 V or more during engine deceleration (when fuel cut) as shown in the illustration. HINT: Whenever the output voltage of the A/F sensor remains at approximately 3.3 V (0.660 V)* (see dwg. 2) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see dwg. 2) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in the A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 16 km/h (10 mph) to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F ratio sensor or ECM, you can obtain a constant voltage. *: When using the OBD II scan tool (excluding hand-held tester). OK : Go to step 13 . NG : Go to next step.
3. Check resistance of A/F sensor heater (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
4. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: EFI MAIN RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
5. Check for open and short in wire harness between ECM and A/F sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). Reference: Bank 1 Sensor 1 System Drawing NG : Repair or replace harness and connector. OK : Go to next step.
6. Check air induction system (see «SFI SYSTEM»(ref-239091-S33576169842006072600000) ). CHECK: Check for vacuum leaks in the air induction system. NG : Repair or replace. OK : Go to next step.
7. Check fuel pressure (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). CHECK: Check fuel pressure (high or low pressure). NG : Check and repair fuel pump, fuel pipe line and filter. OK : Go to next step.
8. Check injector injection (see «INSPECTION»(ref-239091-S20148931092006072600000) ). CHECK: Check injector injection (high or low injection quantity or poor injection pattern). NG : Replace injector. OK : Go to next step.
9. Replace A/F sensor. GO : Go to next step.
10. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
11. Are there DTCs P2195 and/or P2196 being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NO : Go to next step.
12. Did vehicle run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : A/F sensor circuit DTCs are caused by shortage of fuel.
13. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
14. Are there DTCs P2195 and/or P2196 being output again? NO : Go to step 18 . YES : Go to next step.
15. Replace A/F sensor. GO : Go to next step.
16. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
17. Are there A/F sensor circuit DTC codes being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) and perform confirmation driving pattern. NO : Go to next step.
18. Did vehicle run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : A/F sensor circuit DTCs are caused by shortage of fuel.

HINT

Hand-held tester only

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

1. Perform the ACTIVE TEST A/F CONTROL operation. HINT: The A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 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. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. Perform the A/F CONTROL operation with the engine idle (press the right or left button). Result: A/F sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: less than 3.0 V -12.5 % --> Lean output: more than 3.35 V Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: +25 % --> Rich output: more than 0.55 V -12.5 % -> Lean output: less than 0.4 V

Note. The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay.

Scheme 196

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

For displaying the graph, enter "ACTIVE TEST / A/F CONTROL / USER DATA", select "AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then press "F4".

HINT

1. If DTC P2238, P2239, P2252 or P2253 is displayed, check the bank 1 sensor 1 circuit.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 197

Scheme 198

1. Check resistance of A/F sensor heater (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
2. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: EFI RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
3. Check for open and short in wire harness between ECM and A/F sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). Reference: Bank 1 Sensor 1 System Drawing NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Refer to DTC P2195. See DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1) .

Scheme 199

Scheme 200

The air-fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output voltage, the ECM determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio. The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is deteriorating or not. A/F sensor response deterioration is determined by the ratio of the A/F sensor output voltage variation and fuel trim variation

HINT

Hand-held tester only

It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble areas are malfunctioning or not.

Perform the ACTIVE TEST A/F CONTROL operation.

HINT

A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 25%.

1. Connect the hand-held tester to the DLC3 on the vehicle.
2. Turn the ignition switch ON.
3. Warm up the engine with the engine speed at 2,500 RPM for approximately 90 seconds.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine idle (press the right or left button). Result: A/F sensor reacts in synchronizing with increase and decrease of injection volume +25 % --> rich output: Less than 3.0 V -12.5 % --> lean output: More than 3.35 V Heated oxygen sensor reacts in synchronizing with increase and decrease of injection volume +25 % --> rich output: More than 0.55 V -12.5 % --> lean output: Less than 0.4 V

Note. However, there is a few second delay in the A/F sensor output. And there is about 20 seconds delay in the heated oxygen sensor.

Scheme 201

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

For displaying the graph, enter "ACTIVE TEST / A/F CONTROL / USER DATA", select "AFS B1S1 and O2S B1S2" by pressing "YES" and push "ENTER". Then press "F4".

HINT

1. DTC P2A00 may be also detected, when the air fuel ratio is stuck rich or lean.
2. A low A/F sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high A/F sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
4. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 202

Scheme 203

Scheme 204

1. Are there any other codes (besides DTC P2A00) being output? YES : Go to relevant DTC chart (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) ). NO : Go to next step.
2. Connect hand-held tester or OBD II scan tool, and read value for voltage output of A/F sensor. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensor (bank 1 sensor 1) with the engine at 2,500 RPM for approximately 90 seconds. Read the A/F sensor voltage on the hand-held tester or OBD II scan tool. CHECK: Hand-held tester only: On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SNAPSHOT / MANUAL SNAPSHOT / USER DATA. Read the values. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow the engine to idle for 30 seconds. Engine is racing at approximately 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully quickly. OK: Standard: Conditions (1) and (2) Voltage changes a little in the vicinity of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustration. Condition (3) A/F ratio sensor voltage increases to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the illustration. HINT: Whenever the A/F sensor output voltage remains at approximately 3.3 V (0.660 V)* (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have an open-circuit. This will happen also when the A/F sensor heater has an open-circuit. Whenever the A/F sensor output voltage remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel is cut) during engine deceleration. This will cause a LEAN condition and should result in a momentary increase in the A/F sensor output voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 16 km/h (10 mph) to allow the ECM to relearn the closed throttle position. When the vehicle is driven: The output voltage of the A/F sensor may be below 2.8 V (0.76 V)* during fuel enrichment. For the vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when trying to overtake another vehicle. The A/F sensor is functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of the A/F sensor or ECM, you will observe a constant voltage. *: Voltage when using the OBD II scan tool. OK : Go to step 14 . NG : Go to next step.
3. Check resistance of A/F sensor heater (see «INSPECTION»(ref-239091-S19591458132006072600000) ). NG : Replace A/F sensor. OK : Go to next step.
4. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: EFI RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
5. Check for open and short in wire harness between ECM and A/F sensor (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). References: Bank 1 Sensor 1 System Drawing NG : Repair or replace harness and connector. OK : Go to next step.
6. Check air induction system (see «SFI SYSTEM»(ref-239091-S33576169842006072600000) ). CHECK: Check for vacuum leaks in the air induction system. NG : Repair or replace. OK : Go to next step.
7. Check connection of PCV hose. NG : Repair or replace PCV hose. OK : Go to next step.
8. Check fuel pressure (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). CHECK: Check fuel pressure (high or low fuel pressure) NG : Check and repair fuel pump, fuel pipe line and filter. OK : Go to next step.
9. Check injector injection (see «INSPECTION»(ref-239091-S20148931092006072600000) ). CHECK: Check injector injection (high or low fuel injection quantity or poor injection pattern). NG : Replace injector. OK : Go to next step.
10. Replace A/F sensor. GO : Go to next step.
11. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1). HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
12. Is there DTC P2A00 being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ) and perform confirmation driving pattern. NO : Go to next step.
13. Confirm if vehicle has run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : DTC P2A00 is caused by running out of fuel.
14. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1). HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
15. Is there DTC P2A00 being output again? NO : Go to step 19 . YES : Go to next step.
16. Replace A/F sensor. GO : Go to next step.
17. Perform confirmation driving pattern (see «CONFIRMATION DRIVING PATTERN»(ref-180979-S14565316932005073000000) under DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1). HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO : Go to next step.
18. Is there DTC P2A00 being output again? YES : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NO : Go to next step.
19. Confirm if vehicle has run out of fuel in past? NO : Check for intermittent problems (see «PRE-CHECK»(ref-180979-S17908463662005073000000) ). YES : DTC P2A00 is caused by running out of fuel.

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 main relay and supplying power to terminal +B of the ECM.

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

Scheme 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

Scheme 210

Scheme 211

1. Check voltage between terminals +B and E1 or ECM connectors. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals +B and E1 of the ECM connectors. OK: Voltage: 9 to 14V OK : Proceed to next circuit inspection shown on problem symptoms table (see «PROBLEM SYMPTOMS TABLE»(ref-180979-S31242948742005073000000) ). NG : Go to next step.
2. Check for open in wire harness between terminal E1 of ECM connector and body ground (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
3. Check voltage between terminal IGSW of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGSW of the ECM connector and the body ground. OK: Voltage: 9 to 14V OK : Go to step 6 . NG : Go to next step.
4. Check IGN fuse. PREPARATION: Remove the IGN fuse from the engine room J/B. CHECK: Check the resistance of the IGN fuse. OK: Resistance: Below 1 ohm NG : Replace IGN fuse. OK : Go to next step.
5. Check ignition switch (see «INSPECTION»(ref-180993-S06284174772005073000000) in IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM ARTICLE). NG : Replace ignition switch. OK : Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM.
6. Check voltage between terminal MREL of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal MREL of the ECM connector and body ground. OK: Voltage: 9 to 14V NG : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). OK : Go to next step.
7. Check EFI1 fuse. PREPARATION: Remove the EFI1 fuse from the engine room J/B. CHECK: Check the resistance of the EFI1 fuse. OK: Resistance: Below 1 ohm NG : Replace EFI1 fuse. OK : Go to next step.
8. Check EFI main relay. PREPARATION: Remove the EFI main relay from the engine room J/B. CHECK: Inspect the EFI main relay. OK: EFI RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace EFI main relay. OK : Go to next step.
9. Check for open and short in wire harness between terminal MREL of ECM and body ground (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Check and repair harness and connector between EFI1 fuse and battery.

When the engine is cranked, current flows from the ignition switch terminal ST1 to the starter relay coil (Marking: ST), and 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 coil of the circuit opening relay (Marking: C/OPN), the relay switches ON, power is supplied to the fuel pump and the fuel pump operates.

While the NE signal is generated and the engine is running, the ECM keeps Tr ON (C/OPN relay ON) and the fuel pump also keeps operating.

Scheme 212

Scheme 213

Scheme 214

Scheme 215

1. Connect hand-held tester and check operation of fuel pump. PREPARATION: Connect the hand-held tester to the DLC3. Turn ON the ignition switch. Push the hand-held tester main switch. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD. CHECK: Check that operating noise is heard from the relay while operating it using the hand-held tester. OK: Operating noise can be heard from the relay. OK : Go to step 5 . NG : Go to next step.
2. Check circuit opening relay (Marking: C/OPN). PREPARATION: Remove the circuit opening relay from the engine room J/B. CHECK: Measure the circuit opening relay. OK: EFI RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace circuit opening relay. OK : Go to next step.
3. Check voltage between terminal FC of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal FC of the ECM connector and body ground. OK: Voltage: 9 to 14V OK : Go to step 5 . NG : Go to next step.
4. Check for open in wire harness between EFI main relay and circuit opening relay (Marking: C/OPN), and circuit opening relay and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).
5. Check fuel pump (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). NG : Repair or replace fuel pump. OK : Go to next step.
6. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

Scheme 216

Scheme 217

Scheme 218

1. Check fuel pump operation (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). CHECK: Check if there is pressure in the fuel inlet hose. HINT: The pipe has fuel pressure if the sound of flowing fuel can be heard. NG : Proceed to next circuit inspection shown on problem symptoms table (see «PROBLEM SYMPTOMS TABLE»(ref-180979-S31242948742005073000000) ). OK : Go to next step.
2. Check operation circuit opening relay (Marking: C/OPN). PREPARATION: Connect between terminal FC of the ECM connector and the body ground. CHECK: Check the relay operation. OK: Noise can be heard from the circuit opening relay. NG : Go to step 6 . OK : Go to next step.
3. Check circuit opening relay (Marking: C/OPN). PREPARATION: Remove the circuit opening relay from the engine room J/B. CHECK: Measure the circuit opening relay. OK: EFI RELAY Tester Connection Specified Condition 3 - 5 10 kohm or higher 3 - 5 Below 1 ohm (when battery voltage is applied to terminals 1 and 2) NG : Replace circuit opening relay. OK : Go to next step.
4. Check voltage between terminal FC of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal FC of the ECM connector and body ground. OK: Voltage: 9 to 14V OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
5. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Go to next step.
6. Check fuel pump (see Check fuel pressure (see «ON-VEHICLE INSPECTION»(ref-239091-S27689125692006072600000) ). NG : Repair or replace fuel pump. OK : Go to next step.
7. Check for open in wire harness between circuit opening relay (Marking: C/OPN) and fuel pump, and fuel pump and body ground (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article). NG : Repair or replace harness and connector. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ).

The MIL is used to indicate the ECM's detection of a vehicle malfunction.

The instrument panel IG2 fuse provides circuit power and the ECM provides the circuit ground that illuminates the MIL.

MIL operations should be checked visually

The MIL should be illuminated when the ignition is first turned ON. If the MIL is always ON or OFF, use the hand-held tester or OBD II scan tool and follow the procedures to determine the cause of problem.

Scheme 219

HINT

Troubleshoot in accordance with the chart below for each trouble symptom.

Troubleshooting Table

1. Check operation of MIL. PREPARATION: Connect the hand-held tester or OBD II scan tool to the DLC3. Turn ON the ignition switch and push the hand-held tester or the OBD II scan tool main switch ON. Switch the hand-held tester or the OBD II scan tool from the normal mode to the check mode. CHECK: Check if the MIL blinks. OK: The MIL blinks. OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
2. Check bulb of MIL. See combination meter troubleshooting. NG : Repair or replace bulb or combination meter assembly. OK : Go to next step.
3. Check that ECM connectors are securely connected to ECM. NG : Connect connector to ECM. OK : Check for open circuit in wire harness between combination meter and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article).
4. Check operation of MIL (see step 1 ). OK : Replace ECM (see «COMPONENTS»(ref-239091-S09451227742006072600000) ). NG : Go to next step.
5. Is DTC output? CHECK: Check the DTC. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-180979-S19974899352005073000000) . OK : Repair circuit indicated by output code. NG : Check for short circuit in wire harness between DLC3 and ECM (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-180907-S19852941862005073000000) in INTRODUCTION article).