Engine (3UZ-FE) - Diagnostics: Diagnosis Lexus GS III

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the following procedures.

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1. DIAGNOSIS SYSTEM Description When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand-held tester. Various data output from the vehicle's ECM can then be read. OBD II regulations require that the vehicle's onboard computer illuminates the Malfunction Indicator Light (MIL) on the instrument panel when the computer detects a malfunction in: 1) the emission control system/components, or 2) the 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-229176-S14114177042006042000000) ). If the malfunction does not occur in 3 consecutive trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory. To check the DTC, connect the hand-held tester or OBD II scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The hand-held tester or OBD II scan tool also enables you to erase the DTC and check the freeze frame data and various forms of engine data (See the instruction manual for the OBD II scan tool or the hand-held tester). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set according to the SAE, while manufacturer controlled codes can be set by a manufacturer with certain restrictions (See the DTC chart on «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). The diagnosis system operates in "normal mode" during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate detection of malfunctions. A "check mode" is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (See step 3 ). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory. This is known as 1st trip detection. If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate. This is known as 2nd trip detection. Freeze frame data: The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred. Priorities for troubleshooting: When multiple DTCs occur, find out the order in which the DTCs should be inspected by checking the component's DTC chart. If no instructions are written in the DTC chart, check DTCs in the following order of priority: DTCs other than fuel trim malfunction DTCs (P0171 and P0172) and misfire DTCs (P0300 to P0308). Fuel trim malfunction DTCs (P0171 and P0172). Misfire DTCs (P0300 to P0308). Check the DLC3. The vehicle's ECM uses the ISO 9141-2 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. DLC3 TERMINALS RESULT REFERENCE Symbol Name Result (Terminal No.) (Reference terminal) (Condition) SIL Bus "+" line Pulse generation (7) (5 - Signal ground) (During transmission) CG Chassis ground 1 ohms or less (4) (Body ground) (Always) SG Signal ground 1 ohms or less (5) (Body ground) (Always) BAT Battery positive 9 to 14 V (16) (Body ground) (Always) HINT: Connect the cable of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual. Inspect the battery voltage. Battery Voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the MIL. The MIL comes on when the ignition switch is turned ON and the engine is not running. HINT: If the MIL is not illuminated, troubleshoot the MIL circuit (See «MIL CIRCUIT MALFUNCTION»(ref-229176-S14323015652006042000000) ). When the engine is started, the MIL should not illuminate. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
2. DTC CHECK (Normal Mode) NOTE: If no DTC appears in normal mode: On the OBD II scan tool or the hand-held tester check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979). When the diagnosis system is changed from normal mode to check mode or vice-versa, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing modes, always check and make a note of DTCs and freeze frame data. Checking DTCs using the OBD II scan tool or hand-held tester. Connect the OBD II scan tool or the hand-held tester to DLC3. Turn the ignition switch ON. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and then write them down. For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. For the OBD II scan tool, see instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For DTC chart subject to "2 trip detection logic", perform either of the following actions. Check the pending fault code: For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES. Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL comes on and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clear the DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see instruction manual. Clear the DTCs not using the OBD II scan tool or the hand-held tester. Remove the EFI and ETCS fuses from the engine room No. 1 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: NOTE: When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected. SYSTEM REFERENCE (INITIALIZATION) System Name (1) Refer To Automatic Transmission Initialization «RESET MEMORY»(ref-229177-S41041917452007052300000) Engine Assembly Initialization ECM Initialization (1) Follow scan tool display instructions under resetting memory.
3. DTC CHECK (Check Mode) HINT: Hand-held tester only: Check mode has a higher sensitivity to detect malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. Follow these steps when preparing to use the hand-held tester check mode. Make sure that the items below are true: Battery positive voltage 11 V or more Throttle valve fully closed Transmission in the P or N position A/C switched OFF Turn the ignition switch OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Change the ECM to check mode with the 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. Clear DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see instruction manual. Clear the DTCs without using the OBD II scan tool or the hand-held tester. Remove the EFI and ETCS fuses from the engine room No. 1 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 «SYSTEM REFERENCE (INITIALIZATION)»(ref-229176-S07006781032007052300000) ).
4. FAIL-SAFE CHART If any of the following codes is recorded, the ECM enters fail-safe mode.
5. CHECK FOR INTERMITTENT PROBLEMS Hand-held tester only: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic. Clear the DTCs (see step a ). Set the check mode (see step 3 ). Perform a simulation test (under «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-229346-S40928248352006041400000) ). Check the connector and terminal (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). Wiggle the harness and connector (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ).
6. BASIC INSPECTION When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location causing the problem can be found quickly and efficiently. Therefore, using this check is essential in the engine troubleshooting. Is battery positive voltage 11 V or more when engine is stopped? NO: Charge or replace battery. YES: Go To Next Step. Is engine cranked? NO: Proceed to «TEST»(ref-229203-S36251575922006042000000) and «STARTER RELAY»(ref-229203-S18156249592006042000000), continue to troubleshoot. YES: Go To Next Step. Does engine start? NO: Go to step 6. YES: Go To Next Step. Check air filter. PREPARATION: Remove the air filter. CHECK: Visual check that the air filter is not excessively dirty or oily. NG: Repair or replace. OK: Go To Next Step. Check idle speed (See «IDLE SPEED»(ref-229197-S05694407062006042000000) ). NG: Proceed to problem symptoms table on «PROBLEM SYMPTOMS»(ref-229176-S38343725702006042000000). OK: Go To Next Step. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). NG: Proceed to «SFI (3UZ-FE)»(ref-229199), and continue to troubleshoot. OK: Go To Next Step. Check for spark (See «IGNITION (3UZ-FE)»(ref-229202) ). NG: Proceed to «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000), and continue to troubleshoot. OK: Proceed to problem symptoms table on «PROBLEM SYMPTOMS»(ref-229176-S38343725702006042000000).
7. DATA LIST HINT: Using the hand-held tester DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten labor time. NOTE: In the (Scheme 51) below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST. According to the display on tester, read the "DATA LIST".
8. ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester or the OBD II scan tool. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST. According to the display on tester, perform the "ACTIVE TEST".
9. DEFINITION OF TERMS DEFINITION OF TERMS Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). Related DTCs A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic. Typical enabling condition Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction threshold (s). Sequence of operation The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction. When a sensor is being monitored, the next sensor or component will not be monitored until the sensor monitoring is finished. Required sensor/components The sensors and components that are used by the ECM to detect malfunctions. Frequency of operation The number of times that the ECM checks for malfunctions per driving cycle. "Once per driving cycle" means that the ECM detects the malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects malfunction every time an enabling condition is met. Duration The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met. Malfunction thresholds Beyond this value, the ECM will conclude that there is a malfunction and set a DTC. MIL operation MIL illumination timing after a defect is detected. "Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction. "2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used in this article 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 VSV for CCV, Canister close valve VSV for canister control Evaporative emissions canister vent valve VSV for EVAP, Vacuum switching valve assembly No. 1, EVAP VSV, Purge VSV Evaporative emissions canister purge valve VSV for pressure switching valve, Bypass VSV Evaporative emission pressure switching valve Vapor pressure sensor, EVAP pressure sensor, Evaporative emission control system pressure sensor Fuel tank pressure sensor Charcoal canister Evaporative emissions canister ORVR system On-board refueling vapor recovery system Intake manifold runner control Intake manifold tuning system Intake manifold runner valve, IMRV, IACV (runner valve) Intake manifold tuning valve Intake control VSV Intake manifold tuning solenoid valve AFS Air fuel ratio sensor O2 sensor Heater oxygen sensor Oxygen sensor pumping current circuit Oxygen sensor output signal Oxygen sensor reference ground circuit Oxygen sensor signal ground Accel position sensor Accelerator pedal position sensor Throttle actuator control motor, Actuator control motor, Electronic throttle motor, Throttle control motor Electronic throttle actuator Electronic throttle control system, Throttle actuator control system Electronic throttle control system Throttle/pedal position sensor, Throttle/pedal position switch, Throttle position sensor/switch Throttle position sensor Turbo press sensor Turbocharger pressure sensor Turbo VSV Turbocharger pressure control solenoid valve P/S pressure switch Power-steering pressure switch VSV for ACM Active control engine mount Speed sensor, Vehicle speed sensor "A", Speed sensor for skid control ECU Vehicle speed sensor ATF temperature sensor, Trans, fluid temp, sensor, ATF temperature sensor "A" Transmission fluid temperature sensor Electronic controlled automatic transmission, ECT Electronically controlled automatic transmission Intermediate shaft speed sensor "A" Counter gear speed sensor Output speed sensor Output shaft speed sensor Input speed sensor, Input turbine speed sensor "A", Speed sensor (NT), Turbine speed sensor Input turbine speed sensor PNP switch, NSW Park/neutral position switch Pressure control solenoid Transmission pressure control solenoid Shift solenoid Transmission shift solenoid valve Transmission control switch, Shift lock control unit Shift lock control module Engine immobiliser system, Immobiliser system Vehicle anti-theft system
11. The monitor will run whenever the following DTCs are not present (Monitor disablement List) HINT: This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on the left are being set. As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not performed.
12. O2S TEST RESULT INTRODUCTION The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBD II scan tool. Based on this, you can find the O2S's conditions. The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snapshot" value that is taken after monitoring and therefore it is not dynamic. In this repair aricle, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items: TEST ID (a code applied to each TEST DATA) Description of TEST DATA Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.) Unit Standard Value If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon. HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER Connect the hand-held tester to the DLC3. On the tester screen, select the following menus: DIAGNOSIS / CARB OBD II / O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed. Select the desired O2S and press ENTER. The following screen will appear. Press HELP and H simultaneously. More information will appear. Example: The hand-held tester displays "17" as a value of the "TIME $81" (see the illustration on the left). Find the Conversion Factor value of "TIME $81" in the O2S TEST RESULT chart below. 0.3906 is specified for $81 in this chart. Multiply "17" in step 1 by 0.3906 (Conversion Factor) in the step 2. 17 x 0.3906 = 6.6% If the answer is within the standard value, the "TIME $81" can be confirmed to be normal. O2S TEST RESULT Chart O2S TEST RESULT CHART TEST ID Description of TEST DATA Conversion Factor Unit Standard Value $81 Percentage of monitoring time when the HO2S voltage is less than 0.05V Multiply 0.3906 % Within 60 %
13. CHECKING MONITOR STATUS NOTE: The monitor status (mode &) is not applicable to the heated oxygen sensor (HO2S). However, HO2S test values can be checked by O2S TEST RESULT (mode 5). Outline The monitor result and the test values can be checked with the OBD II scan tool. The engine control module (ECM) monitors the emissions-related components as the thermostat, catalyst converter and evaporative emissions (EVAP), and determines whether they are functioning normally or not. When finished monitoring, the ECM stores the monitor results and the test values. The monitor result indicates whether the component is functioning normally or not. The test value is the value that was used to determine the monitor result. If the test value is outside the test limit (malfunction criterion), the ECM determines the component is malfunctioning. Some emissions-related components have multiple test values to determine monitor result. If one of these test values is outside test limit, the ECM determines the component is malfunctioning. Description The test value and test limit information are described as shown in the following table. This information is included under "MONITOR RESULT" in the emissions-related DTC sections: TID $8: Thermostat THERMOSTAT TEST DESCRIPTION TLT CID Unit Conversion Description of Test Value Description of Test Limit 1 $01 Multiply by 0.625 and subtract 40 [°C] ECT sensor output when estimated ECT has reached to malfunction criterion Malfunction criterion for thermostat TID (Test Identification Data) is assigned to each emissions-related component. TID (Test Limit Type): If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit. CID (Component Identification Data) is assigned to each test value. Unit Conversion is used to calculate the test value indicated on generic OBDII scan tools. Procedure (using hand-held tester) Connect the hand-held tester to the DLC3. Turn the ignition switch and hand-held tester ON. Clear DTCs. Allow the vehicle to drive, in accordance with the applicable drive pattern described in ( «READINESS MONITOR DRIVE PATTERN»(ref-229176-S20592704582006042000000) ). Select the hand-held tester menus: DIAGNOSIS, ENHANCED OBDII, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name. INCMP indicates the component has not been monitored yet. PASS indicates the component is functioning normally. FAIL indicates the component is malfunctioning. Select the component and press ENTER. If the monitor result has been PASS or FAIL, the accuracy test value appears. VAL indicates the test value. LMT indicates the test limit (malfunction criterion). TLT indicates the test limit type. Compare the test value with the test limit. 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 higher than the test limit. If the test value is on the borderline of the test limit, a malfunction is concealed in the component. HINT: The monitor result might on rare occasions be PASS even if the malfunction indicator lamp (MIL) is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

DIAGNOSTIC TROUBLE CODE CHART

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

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

DIAGNOSTIC TROUBLE CODE CHART

During the DTC check, refer to the tables below if a malfunction code is displayed.

DTC Trouble Area & MIL Indication

HINT

*1: MIL lights up.

*2: MIL lights up or blinks.

*: - ....MIL does not light, O ....MIL lights up.

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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 the sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the camshaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing is verified by the ECM.

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INSPECTION PROCEDURE

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. If DTC P0010 displayed, check bank 1 OCV circuit.
4. If DTC P0020 displayed, check bank 2 OCV circuit.
5. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Hand-held tester

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1. Check OCV circuit. PREPARATION: Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch On and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1. CHECK: Check the engine speed when operating the OCV by the hand-held tester. OK: TESTER OPERATION - SPECIFIED CONDITION Tester Operation Specified Condition OCV is OFF Normal engine speed OCV is ON Rough idle or engine stall OK: Check for intermittent problems? (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). NG: Go To Next Step.
2. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery voltage between the terminals of the OCV. CHECK: Check the engine speed. OK: Rough idle or engine stalled. NG: Replace OCV. OK: Go To Next Step.
3. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, and check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
4. Check for open and short in harness and connector between OCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check operation of OCV. PREPARATION: Start the engine and warm it up. Disconnect the OCV connector. Apply battery voltage between the terminals of the OCV. CHECK: Check the engine speed. OK: Rough idle or engine stall NG: Replace OCV. OK: Go To Next Step.
2. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, and check the waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
3. Check for open and short in harness and connector between OCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ).

Refer to DTCS P0010 .

Scheme 81

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. If DTC P0011, P0012 is displayed, check the bank 1 VVT system. If DTC P0021, P0022 is displayed, check the bank 2 VVT system.
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, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Hand-held tester

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1. Check valve timing (Check for looseness and jumped tooth of timing belt) (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). NG: Adjust valve timing. OK: Go To Next Step.
2. Check operation of OCV. PREPARATION: Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1. CHECK: Check the engine speed when operating the OCV by the hand-held tester. OK: TESTER OPERATION - SPECIFIED CONDITION Tester Operation Specified Condition OCV is OFF Normal engine speed OCV is ON Rough idle or engine stall NG: Go to step 4 . OK: Go To Next Step.
3. Check if DTC output reoccurs. PREPARATION: Clear the DTCs. Operating the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTCs using the hand-held tester. OK: No DTC output. OK: VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: Go To Next Step.
4. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, check the waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
5. Check oil control valve filter. NG: Replace oil control valve filter. OK: Go To Next Step.
6. Check oil control valve (See «CAMSHAFT TIMING OIL CONTROL VALVE»(ref-229199-S14007308962006042000000) ). OK: Go to step 8 . NO: Go To Next Step.
7. Replace oil control valve. Go: Go To Next Step.
8. Check VVT controller assembly. PREPARATION: Remove the timing belt (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). Remove the cylinder head cover. Remove the OCV (See «REMOVAL»(ref-229199-S21040887952006042000000) ). Drain the oil in the VVT controller assembly (See appropriate step(s) under «REMOVAL»(ref-229197-S27822833882006042000000) ). CHECK: Check whether the oil in the VVT controller assembly is drained or not. OK: The oil in the VVT controller assembly is drained. OK: Go to step 10 . NG: Go To Next Step.
9. Replace VVT controller assembly (See appropriate step(s) under «CYLINDER HEAD»(ref-229197-S15338678882006042000000) ). Go: Go To Next Step.
10. Check blockage of OCV, oil check valve and oil pipe No. 1. NG: Repair or replace. OK: Go To Next Step.
11. Check whether or not DTC P0011, P0012, P0021 or P0022 is stored. PREPARATION: Clear the DTCs. Operate the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the hand-held tester. OK: No DTC output. OK: VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 84

Scheme 85

Scheme 86

1. Check valve timing (Check for looseness and jumped tooth of timing belt) (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). NG: Adjust valve timing. OK: Go To Next Step.
2. Check operation of OCV. PREPARATION: Start the engine. CHECK: Check the engine speed when disconnecting the OCV connector. Check the engine speed when applying battery positive voltage between the terminals of the OCV. RESULT: OCV OPERATION RESULT Result Check (a) Check (b) 1 Normal engine speed Rough idle or engine stall 2 Except 1 2: Go to step 4 . 1: Go To Next Step.
3. Check if DTC output reoccurs. PREPARATION: Clear the DTCs. Operate the OBD II scan tool to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTCs using the OBD II scan tool. OK: No DTC output. OK: VVT system OK* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
4. Check voltage between terminals OCV+ and OCV- of ECM connector. Reference: INSPECTION USING OSCILLOSCOPE Turn the ignition switch ON, and check waveform between terminals OCV+ and OCV- of the ECM connector. HINT: The correct waveform is as shown in the illustration. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
5. Check oil control valve filter. NG: Replace oil control valve filter. OK: Go To Next Step.
6. Check OCV (See «CAMSHAFT TIMING OIL CONTROL VALVE»(ref-229199-S14007308962006042000000) ). OK: Go to step 8 . NG: Go To Next Step.
7. Replace OCV (See «CAMSHAFT TIMING OIL CONTROL VALVE»(ref-229199-S14007308962006042000000) ). Go: Go To Next Step.
8. Check VVT controller assembly. PREPARATION: Remove the timing belt (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). Remove the cylinder head cover. Remove the OCV (See «REMOVAL»(ref-229199-S21040887952006042000000) ). Drain the oil in the VVT controller assembly (See appropriate step(s) under «REMOVAL»(ref-229197-S27822833882006042000000) ). CHECK: Check whether the oil in the VVT controller assembly is drained or not. OK: The oil in the VVT controller assembly is drained. OK: Go to step 10 . NG: Go To Next Step.
9. Replace VVT controller assembly (See appropriate step(s) under «CYLINDER HEAD»(ref-229197-S15338678882006042000000) ). Go: Go To Next Step.
10. Check blockage of OCV, oil check valve and oil pipe No. 1. NG: Repair or replace. OK: Go To Next Step.
11. Check whether or not DTC P0011, P0012, P0021 or P0022 is stored. PREPARATION: Clear the DTCs. Operate the OBD II scan tool to erase the codes, or disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. CHECK: Read output DTC using the OBD II scan tool. OK: No DTC output. OK: VVT system is OK.* *: DTCs P0011 and P0012 are output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

VVT sensor (VVL or VVR signal) consist of a magnet, iron core and pickup coil.

The VVL or VVR signal plate has 3 tooth on its outer circumference and is mounted on the intake camshafts.

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

The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control the intake valve timing in response to during condition.

Scheme 87

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. If DTC P0016 is displayed, check bank 1 VVT sensor.
4. If DTC P0018 is displayed, check bank 2 VVT sensor.
5. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Check valve timing (Check for looseness and jumped teeth of timing belt) (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). NG: Adjust valve timing (Repair or replace timing belt). OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

Refer to DTC P0130 .

HINT

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

Scheme 88

Scheme 89

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. Sensor 1 refers to the sensor closer to the engine body.
4. Sensor 2 refers to the sensor farther away from the engine body.

HINT

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

Scheme 90

1. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
2. Check EFI relay (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
3. Check voltage between terminals HTR, HTR2, HTL, HTL2 of ECM connectors and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals HTR, HTR2, HTL, HTL2 of the ECM connectors and body ground. HINT: Connect terminal HTR to bank 2 sensor 1. Connect terminal HTR2 to bank 2 sensor 2. Connect terminal HTL to bank 1 sensor 1. Connect terminal HTL2 to bank 1 sensor 2. OK: Voltage: 9 to 14 V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
4. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and heated oxygen sensor, and heated oxygen sensor and ECM (See page NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

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

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

Scheme 91

Scheme 92

HINT

After confirming DTC P0100, P0102 or P0103, confirm the mass air flow ratio in the "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL" using the hand-held tester or the OBD II scan tool.

Scheme 93

HINT

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

Scheme 94

Scheme 95

Scheme 96

1. Connect OBD II scan tool or hand-held tester, and read value of mass air flow rate. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. Start the engine. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAR CHECK: Read the mass air flow rate on the OBD II scan tool or the hand-held tester. RESULT: AIR FLOW RATE REFERENCE Air Flow Rate (gm/s) Proceed to 0.0 A 271.0 or more B Between 1.0 and 270.0 ( (1) ) C (1) The value must change when the throttle valve is opened or closed. B: Go to step 6 . C: Check for intermittent problems / (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). A: Go To Next Step.
2. Check voltage of mass air flow meter power source. PREPARATION: Disconnect the mass air flow meter connector. Turn the ignition switch ON. CHECK: Measure the voltage between terminal 1 of the mass air flow meter connector and body ground. OK: Voltage: 9 to 14 V NG: Go to step 5 . OK: Go To Next Step.
3. Check voltage between terminal VG of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Start the engine. CHECK: Measure the voltage between terminal VG of the ECM connector and body ground while the engine is idling. OK: Voltage: 0.5 to 3.0 V (P or N position and A/C switch OFF) OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
4. Check for open and short in harness and connector between mass air flow meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace mass air flow meter.
5. Check for open and short in harness and connector between EFI relay (Marking: EFI) and mass air flow meter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check ECM power source circuit (See «ECM POWER SOURCE CIRCUIT»(ref-229176-S20706453332006042000000) ).
6. Check continuity between terminal EVG of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). CHECK: Check the continuity between terminal EVG of the ECM connector and body ground. OK: Continuity (1 ohms or less) NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
7. Check for open in harness and connector between mass air flow meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace mass air flow meter.

Refer to DTC P0100 .

Scheme 97

HINT

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

1. Are there any other codes (besides DTC P0101) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT DISPLAY Display (DTC output) Proceed to P0101 and other DTCs A P0101 B HINT: If any other codes besides P0101 are output, perform the troubleshooting for those DTCs first. B: Replace mass air flow meter. A: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ).

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 resistance varies as voltage changes to the ECM terminal. (Scheme 98) The intake air temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA (THAR) via resistor R.

That is, the resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.

Scheme 98

Scheme 99

HINT

After confirming DTC P0110, use the OBD II scan tool or hand-held tester to confirm the intake air temperature from the CURRENT DATA.

TEMPERATURE DISPLAYED AND MALFUNCTION

HINT

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

Scheme 100

Scheme 101

Scheme 102

Scheme 103

1. Connect OBD II scan tool or hand-held tester, and read value of intake air temperature. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST/ALL/INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Same as actual intake air temperature. RESULT: AIR TEMPERATURE DISPLAYED REFERENCE Displayed Temperature Proceed to -40 °C (-40 °F) A 140°C (284° F) or more B OK (Same as air temperature near to the intake) C HINT: If there is open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40 °F). If there is short circuit, the OBD II scan tool or the hand-held tester indicates 140°C (284°F) or more. B: Go to step 4 . C: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). A: Go To Next Step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the mass air flow meter connector. Connect the sensor wire harness terminals together. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace mass air flow meter. NG: Go To Next Step.
3. Check for open in harness or ECM. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Connect terminals THA and ETHA of the ECM connector. HINT: The mass air flow meter connector is disconnected. Before checking, do a visual and contact pressure checks for the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK: Open in harness between terminals ETHA and / THA, repair or replace harness. NG: Confirm good connection at ECM. If OK, replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the mass air flow meter connector. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK: Replace mass air flow meter. NG: Go To Next Step.
5. Check for short in harness or ECM. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Disconnect the E4 connector from the ECM. HINT: The mass air flow meter connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

A thermistor is built into the engine coolant temperature 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 intake air temperature sensor.

HINT

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

Scheme 104

HINT

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

TEMPERATURE DISPLAYED AND MALFUNCTION

HINT

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

Scheme 105

Scheme 106

Scheme 107

Scheme 108

1. Connect OBD II scan tool or hand-held tester, and read value of engine coolant temperature. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Same as actual engine coolant temperature. RESULT: COOLANT TEMPERATURE DISPLAYED REFERENCE Displayed Temperature Proceed to -40 °C (-40 °F) A 140°C(284°F)or more B OK (Same as air temperature near to the intake) C HINT: If there is open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40°F). If there is short circuit, the OBD II scan tool or the hand-held tester indicates 140°C (284°F) or more. B: Go to step 4 . C: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). A: Go To Next Step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the engine coolant temperature sensor connector. Connect the sensor wire harness terminals together. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace engine coolant temperature sensor. NG: Go To Next Step.
3. Check for open in harness or ECM. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Connect terminals THW and ETHW of the ECM connector. HINT: The engine coolant temperature sensor connector is disconnected. Before checking, do a visual and contact pressure checks for the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: 140°C (284°F) or more OK: Open in harness between terminals ETHW and / THW, repair or replace harness. NG: Confirm good connection at ECM. If OK, replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the engine coolant temperature sensor connector. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK: Replace engine coolant temperature sensor. NG: Go To Next Step.
5. Check for short in harness or ECM. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Disconnect the E4 connector from the ECM. HINT: The engine coolant temperature sensor connector is disconnected. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or hand-held tester. OK: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

Refer to DTC P0115 .

Scheme 109

HINT

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

Replace engine coolant temperature sensor.

HINT

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

Scheme 110

Scheme 111

1. Check throttle position sensor. PREPARATION: Disconnect the throttle position sensor connector. CHECK: Measure the resistance between the terminals of the throttle position sensor. OK: THROTTLE POSITION SENSOR TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition VC (T3-1) - ETA (T3-4) 1.2 to 3.2 ohms 20°C(68°F) VTA (T3-2) - ETA (T3-4) 1.8 to 10.5 ohms 20°C(68°F) VTA2 (T3-3) - ETA (T3-4) 1.8 to 10.5 ohms 20°C(68°F) NG: Replace throttle position sensor. OK: Go To Next Step.
2. Check voltage between terminals VC and ETA of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and ETA of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
3. Check for open and short in harness and connector between throttle position sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace throttle position sensor.

HINT

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

Replace throttle position sensor (See REPLACE THROTTLE POSITION SENSOR ).

Refer to DTC P0115 .

Scheme 112

HINT

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

1. Are there any other codes (besides DTC P0125) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or OBD II scan tool. RESULT: DTC OUTPUT DISPLAY REFERENCE Display (DTC Output) Proceed to P0125 A "P0125" and other DTCs B HINT: If any other codes besides "P0125" is output, perform the troubleshooting for those codes first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check thermostat (See «THERMOSTAT»(ref-229200-S27538812072006042000000) ). NG: Replace thermostat (See «THERMOSTAT»(ref-229200-S27538812072006042000000) ). OK: Go To Next Step.
3. Check cooling system. CHECK: Check that there is defect in the cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on. NG: Repair or replace cooling system. OK: Replace engine coolant temperature sensor.

HINT

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

1. Check cooling system. CHECK: Check that there is defect in the cooling system which causes overcool, such as abnormal radiator fan operation, modified cooling system and so on. NG: Repair or replace cooling system. OK: Go To Next Step.
2. Check thermostat (See «THERMOSTAT»(ref-229200-S27538812072006042000000) ). NG: Replace thermostat. YES: Go To Next Step.
3. Are there any other codes (besides DTC P0128) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs. RESULT: DTC OUTPUT DISPLAY REFERENCE Display (DTC output) Proceed to P0128 A "P0128" and other DTCs B HINT: If any other codes besides P0128 is output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio. The heated oxygen sensor has the characteristic whose output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. This characteristic is used to detect the oxygen concentration in the exhaust gas and provide the ECM with feedback to control the air-fuel ratio.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V). When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen concentration in the exhaust gas is reduced and the heated oxygen sensor informs the ECM of the RICH condition (high voltage, i.e. more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if a malfunction of the heated oxygen sensor causes output of abnormal voltage, this disables the ECM for performing an accurate air-fuel ratio control. The heated oxygen sensors include a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.

Scheme 113

HINT

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

Scheme 114

Scheme 115

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. Sensor 1 refers to the sensor closer to the engine body.
4. The heated oxygen sensor's output voltage and the short-term fuel trim value can be read using the OBD II scan tool or hand -held tester.

Scheme 116

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

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

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

Scheme 117

Scheme 118

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL"

(Heated oxygen sensor or another can be distinguished).

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

HINT

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

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

RESULT

1. Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
2. +25% --> rich output: More than 0.5 V
3. 12.5% --> lean output: Less than 0.4 V

Note. However, there is a few seconds delay in the sensor 1 (front sensor) output. And there is approximately 20 seconds delay in the sensor 2 (rear sensor).

Scheme 119

The following A/F CONTROL procedure enables the 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 "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

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

HINT

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

Scheme 120

Scheme 121

1. Are there any other codes (besides DTC P0130, P0150, P2195, P2196, P2197 or P2198) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT DISPLAY REFERENCE Display (DTC Output) Proceed to "P0130, P0150, P2195, P2196, P2197 and/or P2198" A "P0130, P0150 P2195, P2196, P2197 or P2198" and other DTCs B HINT: If any other codes besides "P0130, P0150, P2195, P2196, P2197 and/or P2198" are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check output voltage of heated oxygen sensor during idling. PREPARATION: Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. Connect the hand-held tester or OBD II scan tool to the DLC3. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1 S1 or B2 S1. CHECK: Use the OBD II scan tool or hand-held tester to read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the following table). OK: Go to step 9 . NG: Go To Next Step.
3. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
4. Check EFI relay (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
5. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
6. Check air induction system (See «SFI (3UZ-FE)»(ref-229199) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK: Go To Next Step.
7. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, / fuel pipe line and filter (See «SFI (3UZ-FE)»(ref-229199) ). OK: Go To Next Step.
8. Check injector injection (See «INSPECTION»(ref-229199-S41332450642006042000000) ). NG: Replace injector. OK: Replace heated oxygen sensor.
9. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) . HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) . Go: Go To Next Step.
10. Is there DTC P0130, P0150, P2195, P2196, P2197 or P2198 being output again? NO: Check for intermittent problems / (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: Replace heated oxygen sensor.

Refer to DTC P0130 .

Scheme 122

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. Sensor 1 refers to the sensor closer to the engine body.

Scheme 123

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

The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an integrated heating element. The heated oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates waveforms of a voltage between 0 V and 1 V in response to the oxygen concentration in exhaust gas. When the output voltage of the heated oxygen sensor is 0.55 V or more, the ECM judges that the air-fuel ratio is RICH. When it is 0.40 V or less, the ECM judges that the air-fuel ratio is LEAN.

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

Scheme 124

Scheme 125

Scheme 126

Refer to PRE-CHECK for detailed information.

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL" (Heated oxygen sensor or another can be distinguished).

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

HINT

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

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

RESULT

1. Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
2. +25 % --> rich output: More than 0.5 V
3. 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 approximately 20 seconds delay in the sensor 2 (rear sensor).

Scheme 127

The following A/F CONTROL procedure enables the 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 "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and DTCs P0133 and/or P0153 will be recorded, and the MIL then comes on.

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

Scheme 128

Scheme 129

1. Are there any other codes (besides DTC P0133 or P0153) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT DISPLAY REFERENCE Display (DTC Output) Proceed to "P0133 and/or P0153" A "P0133 or P0153" and other DTCs B HINT: If any other codes besides "P0133 and/or P0153" are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check output voltage of heated oxygen sensor during idling. PREPARATION: Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. Connect the hand-held tester or OBD II scan tool to the DLC3. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1 S1 or B2 S1. CHECK: Use the OBD II scan tool or hand-held tester to read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the following table). OK: Go to step 9 . NG: Go To Next Step.
3. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
4. Check EFI relay (see «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
5. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
6. Check air induction system (See «SFI (3UZ-FE)»(ref-229199) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK: Go To Next Step.
7. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI (3UZ-FE)»(ref-229199) ). OK: Go To Next Step.
8. Check injector injection (See «INSPECTION»(ref-229199-S41332450642006042000000) ). NG: Replace injector. OK: Replace heated oxygen sensor.
9. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR1) DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR1) DTC P2195 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 1 SENSOR 1) DTC P2196 OXYGEN SENSOR SIGNAL STACK RICH (BANK 1 SENSOR 1) DTC P2197 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 2 SENSOR 1) DTC P2198 OXYGEN SENSOR SIGNAL STACK RICH (BANK 2 SENSOR 1)»(ref-229176-S24475950852006042000000) ). HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) . GO: Go To Next Step.
10. Is there DTC P0133 or P0153 being output again? NO: Check for intermittent problems ? (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: Replace heated oxygen sensor.

Refer to DTC P0130 .

Scheme 130

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1. Sensor 1 refers to the sensor closer to the engine assembly.
3. After confirming DTC P0134 and P0154, check the output voltage of the heated oxygen sensor in the "DIAGNOSIS / ENHANCE OBDII / DATA LIST / ALL" using the OBD II scan tool or the hand-held tester. If output voltage of the heated oxygen sensor is always less than 0.1 V, heated oxygen sensor circuit may be open or short.

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL" (Heated oxygen sensor or another can be distinguished).

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

HINT

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

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

RESULT

1. Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
2. +25 % --> rich output: More than 0.5 V
3. 12.5 % --> lean output: Less than 0.4 V

Note. However, there is a few seconds delay in the sensor 1 (front sensor) output. And there is approximately 20 seconds delay in the sensor 2 (rear sensor).

Scheme 131

The following A/F CONTROL procedure enables the 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 "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

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

Scheme 132

1. Are there any other codes (besides DTC P0134 and P0154) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT DISPLAY REFERENCE Display (DTC Output) Proceed to "P0134 and/or P0154" A "P0134 or P0154" and other DTCs B HINT: If any other codes besides P0134 and/or P0154 are output, perform the troubleshooting for those codes first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Connect OBD II scan tool or hand-held tester, and read value of voltage output of heated oxygen sensor (bank 1, 2 sensor 1). PREPARATION: Connect the OBD II scan tool or the hand-held tester to the DLC3. Warm up the engine to the normal operating temperature. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1 S1 or B2 S1. CHECK: Read the voltage output of the heated oxygen sensors when the engine speed is suddenly increased. HINT: Quickly accelerate the engine to 4,000 RPM 3 times by using the accelerator pedal. OK: Heated oxygen sensor outputs a RICH signal (0.45 V or more) at least once. OK: Go to step 12 . NG: Go To Next Step.
3. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go To Next Step.
4. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
5. Check EFI relay (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
6. Check for open and short in harness and connector between ECM and heated oxygen sensor (bank 1, 2 sensor 1) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
7. Check whether misfire is occurred or not by monitoring DTC and data list. NG: Perform troubleshooting for misfire / (See «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000) ). OK: Go To Next Step.
8. Check air induction system (See «SFI (3UZ-FE)»(ref-229199) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK: Go To Next Step.
9. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). OK: Go To Next Step.
10. Check injector injection (See «INSPECTION»(ref-229199-S41332450642006042000000) ) NG: Replace injector. OK: Go To Next Step.
11. Check gas leakage on exhaust system. NG: Repair or replace exhaust gas leakage point. OK: Replace heated oxygen sensor (bank 1, 2 sensor 1).
12. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR1) DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR1) DTC P2195 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 1 SENSOR 1) DTC P2196 OXYGEN SENSOR SIGNAL STACK RICH (BANK 1 SENSOR 1) DTC P2197 OXYGEN SENSOR SIGNAL STACK LEAN (BANK 2 SENSOR 1) DTC P2198 OXYGEN SENSOR SIGNAL STACK RICH (BANK 2 SENSOR 1)»(ref-229176-S24475950852006042000000) ). HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S34024404822006042000000) . Go: Go To Next Step.
13. Is there DTC P0134 and P0154 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NO: Go To Next Step.
14. Did vehicle run out of fuel in past? NO: Check for intermittent problems / (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: DTC P0134 and P0154 is caused by running out of fuel.

Refer to DTC P0130 .

Scheme 133

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not include cylinder No. 1.
3. Sensor 2 refers to the sensor farther away from the engine body.

Refer to PRE-CHECK for detailed information.

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL" (Heated oxygen sensor or another can be distinguished).

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

HINT

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

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

RESULT

1. Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
2. +25 % --> rich output: More than 0.5 V
3. 12.5 % --> lean output: Less than 0.4 V

Note. There is a few seconds delay in the sensor 1 (front sensor) output. And there is approximately 20 seconds delay in the sensor 2 (rear sensor).

Scheme 134

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

For displaying the graph indication, first enter "ACTIVE TEST / A/F CONTROL / USER DATA," then select "02S B1S1and O2S B1S2" by pressing "YES" button, and push "ENTER" button before pressing "F4" button.

HINT

1. If different DTCs that are related to different system 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 OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 135

Scheme 136

1. Are there any other codes (besides DTC P0136 or P0156) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to "P0136 and/or P0156" A "P0138 and/or P0158" and other DTCs B Other DTCs are out put C HINT: If any other codes besides P0136 and/or P0156 are output, perform the troubleshooting for those DTCs first. B: Go to step 8 C: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check output voltage of heated oxygen sensor. PREPARATION: Connect the OBD II scan tool or the hand-held tester to the DLC3. After warming up the engine, run the engine at 2,500 RPM for 3 minutes. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B2 S1 or B2 S2. CHECK: Read the voltage output of the heated oxygen sensor when the engine speed is suddenly increased. HINT: Quickly accelerate the engine to 4,000 RPM for 3 minutes 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 resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
4. Check EFI relay (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
5. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace heated oxygen sensor.
6. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) . HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) . Go: Go To Next Step.
7. Is the DTC P0136 or P0156 being output again? NO: Check for intermittent problems / (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: Replace heated oxygen sensor.
8. Check output voltage of heated oxygen sensor. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn ON the ignition switch. Push the OBD II scan tool or the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B2 S1 or B2 S2. Run the engine at idle. Read the output voltage of the heated oxygen sensor during idling. SENSOR OUT PUT VOLTAGE REFERENCE Heated oxygen sensor output voltage Proceed to More than 1.2 A Less than 1.0 B B: Go to step 6 A: Go To Next Step.
9. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). OK: Replace ECM NG: Go To Next Step.
10. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Replace heated oxygen sensor.

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

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

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

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

Scheme 137

HINT

1. When DTC P0171 or P0174 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 or P0175 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 or P0174 may be recorded. The MIL then comes on.
3. If the total of the short-term fuel trim value and long-term fuel trim value is within +/- 35 % (engine coolant temperature is more than 75°C (167°F)), the system is functioning normally.

Scheme 138

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 value. And the deviation from a simulated fuel injection amount by the ECM affects a smoothed fuel trim learning Value. The smoothed fuel trim learning value is the combination of smoothed short-term fuel trim (fuel feedback compensation value) and smoothed long-term fuel trim (learning value of the air-fuel ratio). When the smoothed fuel trim learning value exceeds the DTC threshold, the ECM interprets this as a fault in the fuel system and sets a DTC.

Example

If the smoothed fuel trim learning value is more than +40 % or less than -35 %. The ECM interprets this as a malfunction in the fuel system.

Scheme 139

Scheme 140

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL"

(Heated oxygen sensor or another can be distinguished).

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

HINT

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

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

RESULT

1. Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
2. +25 % --> rich output: More than 0.5 V
3. 12.5 % --> lean output: Less than 0.4 V

Note. There is a few seconds delay in the sensor 1 (front sensor) output. And there is approximately 20 seconds delay in the sensor 2 (rear sensor).

Scheme 141

The following A/F CONTROL procedure enables the 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 "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

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

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

1. Check air induction system (See «SFI (3UZ-FE)»(ref-229199) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. NO: Go To Next Step.
2. Check connection of PCV piping. NG: Repair or replace PCV valve and hose. OK: Go To Next Step.
3. Check injector injection (See «INSPECTION»(ref-229199-S41332450642006042000000) ). NG: Replace injector. OK: Go To Next Step.
4. Check mass air flow meter. PREPARATION: Remove the mass air flow meter. CHECK: Inspect output voltage. Apply battery voltage across terminals +B and E2G. Connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G. Blow air into the mass air flow sensor, and check that the voltage fluctuates. Inspect resistance. Measure the resistance between terminals of the intake air temperature sensor. Resistance: MASS AIR FLOW METER TESTER CONNECTION SPECIFICATION Tester Connection Temperature Specified Condition THA (4) - E2 (5) -20 °C (-4°F) 13.6 to 18.4 kohms THA (4) - E2 (5) 20°C(68°F) 2.21 to 2.69 kohms THA (4) - E2 (5) 60°C(140°F) 0.49 to 0.67 kohms NG: Replace mass air flow meter. OK: Go To Next Step.
5. Check engine coolant temperature sensor. PREPARATION: Remove the engine coolant temperature sensor. CHECK: Measure the resistance between the terminals of the engine coolant temperature sensor. Resistance: ENGINE COOLANT TEMPERATURE SENSOR TESTER CONNECTION SPECIFICATION Tester Connection Specified Condition 1 - 2 2.32 to 2.59 kohms (20°C (68°F)) 1 - 2 0.310 to 0.326 kohms (80°C (176°F)) NOTE: In case of checking the engine coolant temperature sensor in the water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (by warming up or cooling down) and repeat the test. Reinstall the engine coolant temperature sensor. NG: Replace engine coolant temperature sensor. OK: Go To Next Step.
6. Check for spark and ignition (See «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000) ). NG: Repair or replace. OK: Go To Next Step.
7. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and replace fuel pump, pressure regulator, fuel pipe line and filter (See «SFI (3UZ-FE)»(ref-229199) ). OK: Go To Next Step.
8. Check gas leakage on exhaust system. NG: Repair or replace exhaust gas leakage point. OK: Go To Next Step.
9. Check output voltage of heated oxygen sensors (bank 1, 2 sensor 1) during idling. PREPARATION: Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 90 seconds. Connect the hand-held tester or OBD II scan tool to the DLC3. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1 S1 or B2 S1. CHECK: Use the OBD II scan tool or hand-held tester to read the output voltage of the heated oxygen sensor during idling. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the following table). OK: Go to step 17 . NG: Go To Next Step.
10. Check resistance of heated oxygen sensor heater (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step.
11. Check EFI relay (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI relay. OK: Go To Next Step.
12. Check for open and short in harness and connector between ECM and heated oxygen sensor (bank 1, 2 sensor 1) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
13. Replace heated oxygen sensor. Go: Go To Next Step.
14. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) . Disconnect the battery terminal and wait for a minute (clear learning value of the air fuel ratio). (*1) Connect the hand-held tester to the DLC3. (*1) Switch the hand-held tester from the normal mode to the check mode (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). (*1) Start the engine and let it idle until engine coolant temperature is 75°C (167°F) or more. (*2) Drive the vehicle at 19 mph (30 km/h) or more for 3 minutes or more. (*3) Let the engine idle for approx. 2 minutes. (*4) Perform steps e and (g) at least 3 times. HINT: If a malfunction exists, the MIL will be illuminated during step f . NOTE: If the conditions in this test are not strictly followed, detecting a malfunction may be difficult. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps e to f , and then perform step f again. GO: Go To Next Step.
15. Is there DTC P0171, P0172, P0174 or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ) and perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) (Refer to step 14 ). NO: Go To Next Step.
16. Did vehicle run out of fuel in the past? NO: Check for intermittent problems ? (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: DTC P0171, P0172, P0174 or P0175 is caused by fuel shortage.
17. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) . HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) (Refer to step 14 ). Go: Go To Next Step.
18. Is there DTC P0171, P0172 P0174 and/or P0175 being output again? NO: Go to step 22 . YES: Go To Next Step.
19. Replace heated oxygen sensor. Go: Go To Next Step.
20. Perform «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) . HINT: Clear all DTCs prior to performing the «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) (Refer to step 14 ). Go: Go To Next Step.
21. Is the DTC P0171, P0172, P0174 and/or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ) and perform / «CONFIRMATION DRIVING PATTERN»(ref-229176-S01473471892006042000000) (Refer to step 14 ). No: Go To Next Step.
22. Confirm if vehicle has run out of fuel in the past. NO: Check for intermittent problems. ? (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). YES: DTC is caused by fuel shortage (DTCs P0171, P0172 P0174 and/or P0175).

When a misfire occurs in the engine, hydrocarbons (HC) enter the exhaust in high concentrations. If this HC concentration is high enough, there could be an increase in exhaust emission levels. High concentrations of HC can also cause the temperature of the catalyst to increase, possibly damaging the catalyst. To prevent this increase 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 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 counter increments when crankshaft rotation speed variations exceed threshold values.

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

Scheme 147

HINT

When several 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 the oscilloscope.

With the engine idling, check the waveform between terminals #1 to #8 and E01 of the ECM connectors.

HINT

The correct waveform is as shown in the illustration.

Scheme 148

Scheme 149

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

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

The ECM blinks the MIL (the MIL blinks immediately) if

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

Scheme 150

Scheme 151

Scheme 152

HINT

1. If DTCs besides misfire DTCs are memorized simultaneously, troubleshoot the non-misfire DTCs first.
2. 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»(ref-229176-S33046225262006042000000) ).
3. On 6 or 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (P0301 to P0308). If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area, only code P0300 may be stored. When only a general misfire fault code like P0300 is stored
4. Erase the general misfire fault code using the hand-held tester or OBD II scan tool. Start the engine and drive the confirmation pattern.
5. Read the value of the misfire ratio for each cylinder. Or read the DTC.
6. Repair the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC.
7. After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs. When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data is over the range of +/-20 %, there is a possibility that the air-fuel ratio is becoming RICH (-20 % or less) or LEAN (+20 % or more).
8. 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.
9. If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2) improper fuel is being used, or 3) the ignition plug is contaminated.
10. Be sure to check the value on the misfire counter after the repair.

Scheme 153

Scheme 154

Scheme 155

Scheme 156

1. Are there any other codes (besides DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs using hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to "P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308" A "P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308" and other DTCs B HINT: If any other codes besides "P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308" are output, perform the troubleshooting for those DTCs. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check wire harness, connector and vacuum hose in engine room. CHECK: Check the connection conditions of wire harness and connector. Check the disconnection, piping and break of vacuum hose. NG: Repair or replace, then confirm that there is no ? misfire (See «CONFIRMATION DRIVING PATTERN»(ref-229176-S33046225262006042000000) ). OK: Go To Next Step.
3. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go To Next Step.
4. Connect hand-held tester, and read the number of misfire. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Start the engine. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL#1 to CYL#8. 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: MISFIRE RATE CYLINDER REFERENCE TABLE MISFIRE RATE CYLINDER REFERENCE High Misfire Rate Cylinder Proceed to 1 or 2 cylinders A More than 3 cylinders B B: Go to step 15 . A: Go To Next Step.
5. Check spark plug and spark of misfiring cylinder (See «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000) ). PREPARATION: Remove the spark plug. CHECK: Check the spark plug type (See «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000) ). Check the electrode for carbon deposits. Check the electrode gap. OK: (a) Recommended spark plug: DENSO made SK20R11 (b) No large carbon deposit present Not wet with gasoline or oil (c) Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.) NOTE: If adjusting the gap of a new spark plug, bend only "the base / ground" electrode. Do not touch the tip. Never attempt to adjust the gap of a used plug. PREPARATION: Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark jumps across electrode gap. OK: Go to step 8 . OK: Go To Next Step.
6. Change normal spark plug and check spark of misfiring cylinder. PREPARATION: Change to the normal spark plug. Remove the spark plug that may be faulty from the ignition coil assembly. Install another spark plug to the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark jumps across electrode gap. OK: Replace spark plug. NG: Go To Next Step.
7. Check for open and short in harness and connector between ignition coil and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). OK: Replace ignition coil with igniter, then confirm / that there is no misfire. NG: Repair or replace harness or connector.
8. Check voltage of ECM terminal for injector of failed cylinder. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between applicable terminals of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Go to step 11 . NG: Go To Next Step.
9. Check resistance of injector of misfiring cylinder (see «ON-VEHICLE INSPECTION»(ref-229199-S37676238982006042000000) ). NG: Replace injector. OK: Go To Next Step.
10. Check for open and short in harness and connector between ignition switch and injector, injector and ECM of misfiring cylinder (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
11. Check injector injection of misfiring cylinder (See «INSPECTION»(ref-229199-S41332450642006042000000) ). NG: Replace injector. OK: Go To Next Step.
12. Check compression pressure of misfiring cylinder (See «COMPRESSION»(ref-229197-S16598433502006042000000) ). NG: Repair or replace. OK: Go To Next Step.
13. Check valve clearance of misfiring cylinder (See «VALVE CLEARANCE»(ref-229197-S15611244312006042000000) ). NG: Adjust valve clearance. OK: Go To Next Step.
14. Check result of step 4 switch step by number of misfire cylinder. MISFIRE RATE CYLINDER REFERENCE High misfire rate cylinder Proceed to 1 or 2 cylinders A More than 3 cylinders B B: Check for intermittent problems ? (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). A: Go To Next Step.
15. Check valve timing (Check for looseness or a jumped tooth of timing belt) (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). NG: Adjust valve timing (Repair or replace timing belt). OK: Go To Next Step.
16. Check fuel pressure (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI (3UZ-FE)»(ref-229199) ). OK: Go To Next Step.
17. Check 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. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read its value displayed on the hand-held tester or the OBD II scan tool. OK: Equivalent to ambient temperature CHECK: Check the air flow rate. When using hand-held tester, enter the following menu: DIAGNOSIS/ENHANCED OBD I I/DATA LIST/ALL/MAF. 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 4 to 6 Running without load (2,500 RPM) 13 to 20 Idling to quickly accelerating Air flow rate fluctuates NG: Replace mass air flow meter. OK: Go To Next Step.
18. Check engine coolant temperature sensor. PREPARATION: Remove the engine coolant temperature sensor. CHECK: Measure the resistance between the terminals of the engine coolant temperature sensor. Resistance: ENGINE COOLANT TEMPERATURE SENSOR TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition 1 - 2 2.32 to 2.59 kohms (20°C (68°F)) 1 - 2 0.310 to 0.326 kohms (80°C (176°F)) NOTE: In case of checking the engine coolant temperature sensor in the water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (by warming up cooling down) and repeat the test. NG: Replace engine coolant temperature sensor OK: Go To Next Step.
19. Switch step by number of misfire cylinder (Refer to the result of step 4 ). HIGH MISFIRE RATE CYLINDER REFERENCE 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-229176-S29341277952006042000000) ).

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

Scheme 157

Reference: INSPECTION USING OSCILLOSCOPE

1. With the engine racing (4,000 RPM), check the waveform between terminals KNK1 and KNK2 of the ECM connector and body ground.

HINT

The correct waveform is as shown in the illustration.

1. Spread the time on the horizontal axis, and confirm that period of the wave is 0.13 msec. (Normal mode vibration frequency of knock sensor: 8.1 kHz)

HINT

If normal mode vibration frequency is not 8.1 kHz, the sensor has a malfunction.

Scheme 158

HINT

1. DTC P0325 is for the bank 1 knock sensor circuit.
2. DTC P0330 is for the bank 2 knock sensor circuit.
3. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 159

1. Connect OBD II scan tool or hand-held tester, and check knock sensor circuit. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Disconnect the EC1 connector. Connect the terminals of the disconnected EC1 male connector and EC1 female as follows. CONNECTOR TERMINALS Male connector <--> Female connector Terminal 2 <--> Terminal 3 Terminal 3 <--> Terminal 2 Turn the ignition switch ON and push the OBDII scan tool or hand-held tester main switch ON. After the engine is warmed up, perform a quick racing to 4,000 RPM three times. CHECK: Check the DTC. RESULT: DTC RESULT Type I DTC same as that of when vehicle brought in P0325 --> P0325 or P0330 --> P0330 Type II DTC different to that of when vehicle brought in P0325 --> P0330 or P0330 --> P0325 Type II: Go to step 3 . Type I: Go To Next Step.
2. Check for open and short in harness and connector between EC1 connector and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
3. Check for open and short in harness and connector between EC1 connector and knock sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). HINT: If DTC P0325 has changed to P0330, check the knock sensor circuit on the bank 1 side. If DTC P0330 has changed to P0325, check the knock sensor circuit on the bank 2 side. NG: Repair or replace harness or connector. OK: Replace knock sensor.

The crankshaft position sensor, which detects the engine speed and crankshaft angle signal (NE signal), is installed on the oil pump body.

The NE signal plate has 34 teeth. The NE signal sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft angle and the engine speed by the NE signal.

Scheme 160

Reference: INSPECTION USING OSCILLOSCOPE

During cranking or idling, check the waveform between terminals G2 and NE-, and NE and NE- of the ECM connector.

HINT

The correct waveforms are as shown in the illustration.

Scheme 161

HINT

1. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame records the engine conditions when a malfunction is detected. When troubleshooting it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio lean or rich, etc. at the time of the malfunction.
2. READ VALUE ON HAND-HELD TESTER OR OBD II SCAN TOOL Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. Select the menu "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD".
3. The engine speed can be confirmed in DATA LIST using the hand-held tester or OBD II scan tool. If there are no NE signals from the crankshaft position sensor despite 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 RPM (than the actual RPM).

Scheme 162

1. Check resistance of crankshaft position sensor. PREPARATION: Disconnect the C5 crankshaft position sensor connector. CHECK: Measure the resistance between terminals 1 and 2. OK: CRANKSHAFT POSITION SENSOR TESTER CONNECTION - SPECIFIED CONDITION Tester Connection Specified Condition 1 - 2 1,630 to 2,740 ohms at cold 2,065 to 3,225 ohms at hot NOTE: " Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG: Replace crankshaft position sensor. OK: Go To Next Step.
2. Check for open and short in harness and connector between ECM and crankshaft position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Check sensor installation (crankshaft position sensor). CHECK: Check the crankshaft position sensor installation. NG: Tighten sensor. OK: Go To Next Step.
4. Inspect teeth of sensor plate. PREPARATION: Remove the crankshaft angle sensor plate (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). CHECK: Check the teeth of sensor plate. NG: Replace sensor plate. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

VVT sensor (VVL or VVR signal) consist of a magnet, iron core and pickup coil.

The VVL or VVR signal plate has 3 teeth on its outer circumference and is mounted on the intake camshafts.

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

The actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control the intake valve timing in response to the detecting condition.

Scheme 163

Reference: INSPECTION USING OSCILLOSCOPE

During idling, check the waveform between terminals VVL+ and VVL-, and VVR+ and VVR- of the ECM connector.

HINT

1. The correct waveform is as shown in the illustration.
2. The waveform frequency is shortened as the engine speed becomes higher.

Scheme 164

HINT

1. If DTC P0340 is displayed, check bank 1 VVT sensor.
2. If DTC P0345 is displayed, check bank 2 VVT sensor.
3. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 165

1. Check resistance of VVT sensor. PREPARATION: Disconnect the VVT sensor connector. CHECK: Measure the resistance between terminals 1 and 2. OK: VVT SENSOR TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 1 - 2 835 to 1,400 ohms at cold 1,060 to 1,645 ohms at hot NOTE: " Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG: Replace VVT sensor. OK: Go To Next Step.
2. Check for open and short in harness and connector between ECM and VVT sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Check sensor installation. CHECK: Check the VVT sensor installation. NG: Tighten sensor. OK: Go To Next Step.
4. Inspect camshaft (See appropriare step(s) under «INSPECTION»(ref-229197-S32695044932006042000000) ). NG: Replace camshaft. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

HINT

1. If DTC P0351 and P0357 are output simultaneously, IF1L circuit may be open or short.
2. If DTC P0354 and P0356 are output simultaneously, IF1R circuit may be open or short.
3. If DTC P0353 and P0355 are output simultaneously, IF2L circuit may be open or short.
4. If DTC P0352 and P0358 are output simultaneously, IF2R circuit may be open or short.
5. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

Scheme 166

Scheme 167

Scheme 168

Scheme 169

1. Check spark plug and spark (See «ON-VEHICLE INSPECTION»(ref-229202-S16326012092006042000000) ). NG: Go to step 4 . OK: Go To Next Step.
2. Check for open and short in harness and connector in IGF and IGT signal circuits between ECM and ignition coil with igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Disconnect ignition coil with igniter connector, and check voltage between terminals IF1L, IF1R, IF2L, IF2R of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Disconnect the ignition coil with the igniter connector. Turn the ignition switch ON. CHECK: Measure the voltage between terminals IF1L, IF1R, IF2L, IF2R of the ECM connector and body ground. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Replace ignition coil with igniter.
4. Check for open and short in harness and connector in IGT signal circuit between ECM and ignition coil with igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
5. Check voltage between terminals IGT1 - IGT8 of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). CHECK: Measure the voltage between terminals IGT1 - IGT8 of the ECM connector and body ground when the engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
6. Disconnect ignition coil with igniter connector, and check voltage between terminals IGT1 - IGT8 of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Disconnect the ignition coil with the igniter connector. CHECK: Measure the voltage between terminals IGT1 - IGT8 of the ECM connector and body ground when the engine is cranked. OK: Voltage: 4.5 V or more NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
7. Check ignition coil with igniter power source circuit. PREPARATION: Disconnect the ignition coil the with the igniter connector. CHECK: Measure the voltage between terminal 1 of the ignition coil with the igniter connector and body ground when the ignition switch is turned to ON and START position. OK: Voltage: 9 to 14 V OK: Repair ignition coil with igniter. NG: Go To Next Step.
8. Check for open and short in harness and connector between ignition switch and ignition coil with igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ignition coil with igniter.

HINT

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

Scheme 170

1. Are there any other codes (besides DTC P0420 or P0430) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to "P0420 and/or P0430" A "P0420 or P0430" and other DTCs B HINT: If any other codes besides "P0420 and/or P0430" are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check gas leakage on exhaust system. NG: Repair or replace exhaust gas leakage point. OK: Go To Next Step.
3. Check heated oxygen sensor (bank 1, 2 sensor 1) (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). HINT: Refer to the hint following the end of this flowchart. NG: Repair or replace. OK: Go To Next Step.
4. Check heated oxygen sensor (bank 1, 2 sensor 2) (See «HEATED OXYGEN SENSOR»(ref-229199-S17423128462006042000000) ). HINT: Refer to the hint following the end of this flowchart. NG: Repair or replace. OK: Replace front and rear three-way catalytic converter. HINT: Hand-held tester only: Narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL" (Heated oxygen sensor or another can be distinguished). Perform ACTIVE TEST by hand-held tester (A/F CONTROL). HINT: "A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch ON. Warm up the engine with the engine speed at 2,500 RPM for approximately 90 seconds. Select the menu "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button). RESULT: Heated oxygen sensor reacts in accordance with increase and decrease of injection volume +25 % --> rich output: More than 0.5 V -12.5 % --> lean output: Less than 0.4 V NOTE: There is a few second delay in the sensor 1 (front sensor) output. And there is approximately 20 seconds delay in the sensor 2 (rear sensor). The following A/F CONTROL procedure enables the 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 "O2S B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button. NOTE: If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and DTCs P0133 and/or P0153 will be recorded, and the MIL then comes on. If different DTCs related to different systems while terminal E2 as ground terminal are output simultaneously, terminal E2 may be open. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

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

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

DTCs P0441, P0446 and P2418 are recorded by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 171) below, or when there is a malfunction in either the EVAP VSV, the pressure switching valve, or in the vapor pressure sensor itself.

Scheme 171

Scheme 172

Scheme 173

HINT

Typical DTC output of each trouble part.

Scheme 174

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV) or 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 OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.
3. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Hand-held tester

Scheme 175

Scheme 176

Scheme 177

Scheme 178

Scheme 179

Scheme 180

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go To Next Step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go To Next Step.
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ).
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go To Next Step.
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the EVAP VSV from the charcoal canister. Start the engine. Select the menu "EVAP (ALON) / ALL" in the ACTIVE TEST and operate VSV for EVAP. CHECK: When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK: Go to step 9 . NG: Go To Next Step.
6. Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG: Repair or replace vacuum hose. OK: Go To Next Step.
7. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-229199-S21042668772006042000000) ). NG: Replace EVAP VSV. OK: Go To Next Step.
8. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
9. Check CCV. PREPARATION: Disconnect the vacuum hose for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "CAN CTRL VSV / ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the CCV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 13 . NG: Go To Next Step.
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG: Repair or replace vacuum hose. OK: Go To Next Step.
11. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-229199-S07574180992006042000000) ). NG: Replace CCV. OK: Go To Next Step.
12. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
13. Check pressure switching valve. PREPARATION: Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "TANK BYPASS VSV / ALL" in the ACTIVE TEST and operate pressure switching valve. CHECK: Check the pressure switching valve operation when it is operated by the hand-held tester. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 16 . NG: Go To Next Step.
14. Check operation of pressure switching valve (See «VSV FOR PRESSURE SWITCHING VALVE»(ref-229199-S42809764752006042000000) ). NG: Replace pressure switching valve. OK: Go To Next Step.
15. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG: Repair or replace. OK: Go To Next Step.
17. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection Check the vacuum hose for cracks, holes and damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection of the fuel tank and fuel EVAP pipe (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go To Next Step.
19. Check voltage between terminals VPTK and EPTK of ECM connector. CHECK: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
20. Check voltage between terminals PTNK and EPTK of ECM connectors. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and EPTK of the ECM connector under the following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 22. NG: Go To Next Step.
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
22. Check fuel tank overfill check valve. NG: Replace fuel tank overfill 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 cranks, holes and damages. NG: Replace charcoal canister. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 181

Scheme 182

Scheme 183

Scheme 184

Scheme 185

Scheme 186

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go To Next Step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go To Next Step.
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ). NG: Replace fuel tank cap. OK: Go To Next Step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go To Next Step.
5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace. OK: Go To Next Step.
6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection of the fuel tank and fuel EVAP pipe (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go To Next Step.
8. Check vacuum hoses ((8), (9), (10) and (11) in 1 in circuit description). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG: Repair or replace vacuum hose. OK: Go To Next Step.
9. Check 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 or sensor connector. OK: Go To Next Step.
10. Check charcoal canister for cracks, holes and damages. NG: Replace charcoal canister. OK: Go To Next Step.
11. Check voltage between terminals VPTK and EPTK of ECM connector. CHECK: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
12. Check voltage between terminals PTNK and EPTK of ECM connectors. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and EPTK of the ECM connector under the following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14 . NG: Go To Next Step.
13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
14. Check EVAP VSV. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal PRG of the ECM connector and body ground (ON). Disconnect the terminal PRG of the ECM connector and body ground (OFF). OK: (1) VSV is ON: Air from port E frows out through port F. (2) VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17 . NG: Go To Next Step.
15. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-229199-S21042668772006042000000) ). NG: Replace EVAP VSV. OK: Go To Next Step.
16. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ) NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
17. Check CCV. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the CCV function. Connect the terminal CCV of the ECM connector and body ground (ON). Disconnect the terminal CCV of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20 . NG: Go To Next Step.
18. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-229199-S07574180992006042000000) ). NG: Replace CCV. OK: Go To Next Step.
19. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
20. Check pressure switching valve. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the pressure switching valve function. Connect the terminal TBP of the ECM connector and body ground (ON). Disconnect the terminal TBP of the ECM connector and body ground (OFF). OK: (1) VSV is ON: Air from port E flows out through port F. (2) VSV is OFF: Air does not flow from port E to port F. OK: Go to step 23 . NG: Go To Next Step.
21. Check operation of pressure switching valve (See «VSV FOR PRESSURE SWITCHING VALVE»(ref-229199-S42809764752006042000000) ). NG: Replace pressure switching valve. OK: Go To Next Step.
22. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
23. Check fuel tank overfill check valve. NG: Replace fuel tank overfill check valve. OK: Go To Next Step.
24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

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

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

DTC P0442, P0455 or P0456 is recorded by the ECM when evaporative emissions leak from the components within the dotted line in 1 below, or when the vapor pressure sensor malfunctions.

Scheme 187

Scheme 188

HINT

Refer to DTC P0441, P0446, P2418

Scheme 189

HINT

Typical DTC output of each trouble part

Scheme 190

Hand-held tester

Scheme 191

Scheme 192

Scheme 193

Scheme 194

Scheme 195

Scheme 196

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go To Next Step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go To Next Step.
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ). NG: Replace fuel tank cap. OK: Go To Next Step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go To Next Step.
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the EVAP VSV from the charcoal canister. Start the engine. Select the menu "EVAP (ALON) / ALL" in the ACTIVE TEST and operate VSV for EVAP. CHECK: When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK: Go to step 9 . NG: Go To Next Step.
6. Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
7. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-229199-S21042668772006042000000) ). NG: Replace EVAP VSV. OK: Go To Next Step.
8. Check for open and short in harness and connector between EFI or ECD relay and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
9. Check CCV. PREPARATION: Disconnect the vacuum hose for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "CAN CTRL VSV / ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the CCV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 13 . NG: Go To Next Step.
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG: Repair or replace vacuum hose. OK: Go To Next Step.
11. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-229199-S07574180992006042000000) ). NG: Replace CCV. OK: Go To Next Step.
12. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
13. Check pressure switching valve. PREPARATION: Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the menu "TANK BYPASS VSV / ALL" in the ACTIVE TEST and operate pressure switching valve. CHECK: Check the pressure switching valve operation when it is operated by the hand-held tester. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 16 . NG: Go To Next Step.
14. Check operation of pressure switching valve (See «VSV FOR PRESSURE SWITCHING VALVE»(ref-229199-S42809764752006042000000) ). NG: Replace pressure switching valve. OK: Go To Next Step.
15. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG: Repair or replace evaporative 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, holes, damages and blockage. 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 of the fuel tank and fuel EVAP pipe (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go To Next Step.
19. Check voltage between terminals VPTK and EPTK of ECM connector. CHECK: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
20. Check voltage between terminals PTNK and EPTK of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and EPTK of the ECM connector under the following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 22 . NG: Go To Next Step.
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
22. Check fuel tank overfill check valve. NG: Replace fuel tank overfill 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 cranks, holes and damages. NG: Replace charcoal canister. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 197

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go To Next Step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go To Next Step.
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ). NG: Replace fuel tank cap. OK: Go To Next Step.
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go To Next Step.
5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emission leak part. OK: Go To Next Step.
6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve, and pressure switching valve and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes and damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check the connection of the fuel tank and fuel EVAP pipe (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-229198-S30610263052006042000000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, holes and damages. NG: Repair or replace hose and tube. OK: Go To Next Step.
8. Check vacuum hoses ((8), (9), (10) and (11) in 1 in circuit description). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damages and blockage. NG: Repair or replace vacuum hose. OK: Go To Next Step.
9. Check 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 or sensor connector. OK: Go To Next Step.
10. Check charcoal canister for cracks, holes and damages. NG: Replace charcoal canister. OK: Go To Next Step.
11. Check voltage between terminals VPTK and EPTK of ECM connector. CHECK: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
12. Check voltage between terminals PTNK and EPTK of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and EPTK of the ECM connector under the following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: Vacuum applied to vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14 . NG: Go To Next Step.
13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.
14. Check EVAP VSV. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal PRG of the ECM connector and body ground (ON). Disconnect the terminal PRG of the ECM connector and body ground (OFF). OK: (1) VSV is ON: Air from port E frows out through port F. (2) VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17 . NG: Go To Next Step.
15. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-229199-S21042668772006042000000) ). NG: Replace EVAP VSV. OK: Go To Next Step.
16. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ) NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
17. Check CCV. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the CCV function. Connect the terminal CCV of the ECM connector and body ground (ON). Disconnect the terminal CCV of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20 . NG: Go To Next Step.
18. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-229199-S07574180992006042000000) ). NG: Replace CCV. OK: Go To Next Step.
19. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
20. Check pressure switching valve. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the pressure switching valve function. Connect the terminal TBP of the ECM connector and body ground (ON). Disconnect the terminal TBP of the ECM connector and body ground (OFF). OK: (1) VS V is on: Air from port E flows out through port F. (2) VSV is OFF: Air does not flow from port E to port F. OK: Go to step 23 . NG: Go To Next Step.
21. Check operation of pressure switching valve (See «VSV FOR PRESSURE SWITCHING VALVE»(ref-229199-S42809764752006042000000) ). NG: Replace pressure switching valve. OK: Go To Next Step.
22. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
23. Check fuel tank overfill check valve. NG: Replace fuel tank overfill check valve. OK: Go To Next Step.
24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. If DTC P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
3. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
4. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 203

Scheme 204

1. Check voltage between terminals VPTK and EPTK of ECM connector. CHECK: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
2. Check voltage between terminals PTNK and EPTK of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. Check the vapor pressure sensor output waveform using a hand-held tester. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: (1) Voltage: 2.9 to 3.7 V (2) Voltage: 0.5 V or less (3) A consecutive waveform presents. OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). NG: Go To Next Step.
3. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.

The vehicle speed sensor detects the rotation speed of the transmission output shaft and sends signals to the ECM. The ECM determines the vehicle speed based on these signals. An AC voltage is generated in the vehicle speed sensor coil as the rotor mounted on the output shaft rotates, and this voltage is sent to the ECM.

Scheme 205

Scheme 206

HINT

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

Scheme 207

Scheme 208

Scheme 209

Scheme 210

1. Connect OBD II scan tool or hand-held tester, and read value of vehicle speed. PREPARATION: Connect the OBD II scan tool or hand-held tester. Start the engine. Turn the ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST/SPD (SP2). CHECK: Drive the vehicle and read the vehicle speed on the OBD II scan tool or hand-held tester. OK: The actual vehicle speed is almost equal to the vehicle speed displayed on the tester. NG: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). OK: Go To Next Step.
2. Check vehicle speed sensor installation. CHECK: Check the speed sensor installation. OK: Sensor is installed properly. There is no clearance between the sensor and transmission. NG: Properly install the vehicle speed sensor. OK: Go To Next Step.
3. Check resistance between terminals SP2+ and SP2- of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Disconnect the E3 connector from the ECM. CHECK: Check the resistance between terminals SP2+ and SP2- of the ECM connector. OK: Resistance: 560 to 680 Q. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
4. Check vehicle speed sensor. PREPARATION: Remove the vehicle speed sensor from the transmission. CHECK: Measure the resistance between terminals 1 and 2 of the speed sensor. OK: Resistance: 560 to 680 ohms Reference: INSPECTION USING OSCILLOSCOPE Check the waveform between terminals SP2+ and SP2- when the vehicle speed is approx. 60 km/h (37 mph). NG: Replace vehicle speed sensor. OK: Check and repair harness and connector between ECM and vehicle speed sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ).

In addition to turning on the stop lights, 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.

SIGNAL AND PEDAL DEPRESSION

Scheme 211

Scheme 212

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.

Hand-held tester

Scheme 213

Scheme 214

1. Check operation of stop light. CHECK: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG: Check and repair stop light circuit. OK: Go To Next Step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the driver side J/B. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG: Check for short in all harness and components connected to STOP fuse. OK: Go To Next Step.
3. Check stop light switch (See «STOP LIGHT SYSTEM»(ref-229394) ). NG: Replace stop light switch. OK: Go To Next Step.
4. Check STP signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. CHECK: Read the STP signal on the hand-held tester. OK: BRAKE PEDAL & STP SIGNAL Brake Pedal STP Signal Depressed ON Released OFF CHECK: Measure the voltage between the ST1- of the connector and body ground. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). NG: Go To Next Step.
5. Check harness and connector between ECM and stop light switch (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 215

Scheme 216

1. Check operation of stop light. CHECK: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG: Check and repair stop light circuit. OK: Go To Next Step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the driver side J/B. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG: Check for short in all harness and components connected to STOP fuse. OK: Go To Next Step.
3. Check stop light switch (See «STOP LIGHT SYSTEM»(ref-229394) ). NG: Replace stop light switch. OK: Go To Next Step.
4. Check STP signal. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Check the voltage between terminal STP of the ECM and body ground. OK: BRAKE PEDAL & VOLTAGE SPECIFICATION Brake Pedal Voltage Depressed 7.5 to 14 V Released Below 1.5 V CHECK: Measure the voltage between the ST1- of the connector and body ground. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). NG: Go To Next Step.
5. Check harness and connector between ECM and stop light switch (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

HINT

1. When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a floor carpet is overlapped on the accelerator pedal, or if the accelerator pedal is not fully released, etc., DTC P0505 will possibly be detected.
2. Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other data from the time when a malfunction occurred.

1. Are there any other codes (besides P0505) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P0505 A "P0505" and other DTCs B HINT: If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go To Next Step.
3. Check air induction system (See «SFI (3UZ-FE)»(ref-229199) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace air induction system. OK: Check electric throttle control system (See «ON-VEHICLE INSPECTION»(ref-229199-S10226504942006042000000) ).

This DTC is output when an unregistered key is inserted. When this DTC is output, delete DTC and insert the key that a customer keeps to check that P0513 is still output.

When a key that outputs P0513 is found, register this key. When P0513 is not output, there is a possibility that the unregistered key has been inserted before. (ECM is normal.)

Inquire a customer the condition of using the system to determine the cause of the trouble.

(Example: Another key has been inserted, etc..)

DTC P0513: DETECTION CONDITION & TROUBLE AREA

1. Delete DTC and insert all the presently available keys to check whether the engine starts or not. HINT: When the key that does not start the engine is inserted, DTC (P0513) is stored in memory. RESULT: DTC P0513 RESULT OK All keys start the engine. NG A specific key does not start the engine. OK: No problem. HINT: If the result is "OK", confirm whether or not the customer has ever inserted the unregistered key or the immobiliser key (with transponder chip) of another vehicle in the ignition key cylinder, and determine the cause of detecting DTC. NG: Register the key that does not start the engine.

HINT

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

Scheme 217

Scheme 218

1. Check EFI fuse of engine room No. 1 R/B. PREPARATION: Remove the EFI fuse from the engine room No. 1 R/B. CHECK: Check the continuity of the EFI fuse. OK: Continuity NG: Check for short in all harness and components connected to EFI fuse. OK: Go To Next Step.
2. Check voltage between terminal BATT of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). CHECK: Measure the voltage between terminal BATT of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
3. Check for open and short in harness and connector between ECM and EFI fuse, EFI fuse and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check and replace engine room No. 1 R/B

HINT

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

1. Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

HINT

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

Hand-held tester

1. Check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON, and push the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: IGNITION SWITCH POSITION Ignition Switch Position ON START STA Signal OFF ON OK: Go to step 5 . NG: Go To Next Step.
2. Check park/neutral position switch (See «DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)»(ref-229177-S15829196952006042000000) ). NG: Replace park/neutral position switch. Go To Next Step 5 after the replacement. OK: Go To Next Step.
3. Check ignition switch (See «IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH»(ref-229387) ). NG: Replace ignition switch. Go To Next Step 5 after the replacement. OK: Go To Next Step.
4. Check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON, and push the hand-held tester main switch ON. Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: IGNITION SWITCH POSITION Ignition Switch Position ON START STA Signal OFF ON NG: Repair or replace harness or connector. OK: Go To Next Step.
5. Check DTC reoccurs PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Clear DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODE and press YES. Drive the vehicle at more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccurs. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P0617 A No DTC output B Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 219

Scheme 220

1. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal STA of the ECM connector and the body ground, while cranking the engine (ignition switch in the START position) and while not cranking the engine (ignition switch in the ON position). OK: Voltage: V or more (ignition switch in the START position) V (ignition switch in the ON position) OK: Go to step 5 . NG: Go To Next Step.
2. Check park/neutral position switch (See «DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)»(ref-229177-S15829196952006042000000) ). NG: Replace park/neutral position switch. Go To Next Step 5 after the replacement. OK: Go To Next Step.
3. Check ignition switch (See «IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH»(ref-229387) ). NG: Replace ignition switch. Go To Next Step 5 after the replacement. OK: Go To Next Step.
4. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal STA of the ECM connector and the body ground, while cranking the engine (ignition switch in the START position) and while not cranking the engine (ignition switch in the ON position). OK: Voltage: V or more (ignition switch in the START position) V (ignition switch in the ON position) NG: Repair or replace harness or connector. OK: Go To Next Step.
5. Check DTC reoccurs PREPARATION: Connect the OBD II scan tool. Turn the ignition switch ON and OBD II scan tool main switch ON. Clear DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Drive the vehicle at more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccurs. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P0617 A No DTC output B Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ).

DTC P0630 is set if the Vehicle Indication Number (VIN) is not stored in the ECM or the input VIN is not accurate. Input the VIN with the hand-held tester (see REGISTRATION ).

DTC P0630: DETECTION CONDITION & TROUBLE AREA

1. Read current DTC. NOTE: If P0630 is set, the VIN must be input to the ECM using the hand-held tester. However, all DTCs are cleared automatically by the tester when inputting the VIN. If DTCs other than P0630 are set, check them first. Next
2. Input VIN with hand-held tester (See «REGISTRATION»(ref-229176-S34558308742006042000000) ). Next: End

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

The G signal plate has 1 tooth on its outer circumference and is installed on the LH camshaft timing pulley. When the camshafts rotate, protrusion on the signal plate and air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil.

The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34 signals at every engine revolution. The ECM detects the crankshaft angle and the engine revolution based on the NE+ signals, and the cylinder and the angle of the VVT based on the combination of the G and NE signals.

Scheme 221

Reference: INSPECTION USING OSCILLOSCOPE

During cranking or idling, check the waveform between terminals G2 and NE-, and NE and NE- of the ECM connector.

HINT

The correct waveforms are as shown in the illustration.

Scheme 222

HINT

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

Scheme 223

Scheme 224

1. Check resistance of camshaft position sensor. PREPARATION: Disconnect the camshaft position sensor connector. CHECK: Measure the resistance between terminals 1 and 2. OK: NOTE: " Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG: Replace camshaft position sensor. OK: Go To Next Step.
2. Check for open and short in harness and connector between ECM and camshaft position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Check sensor installation (Camshaft position sensor). CHECK: Check the camshaft position sensor installation. NG: Tighten sensor. OK: Go To Next Step.
4. Inspect teeth of LH camshaft timing belt pulley. PREPARATION: Remove the LH camshaft timing belt pulley (See «TIMING BELT»(ref-229197-S22178744832006042000000) ). CHECK: Check the LH camshaft timing belt pulley. NG: Replace LH camshaft timing pulley. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

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

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

Scheme 225

Perform troubleshooting (See DIAGNOSTIC TROUBLE CODE CHART in the Multiplex Communication System 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, as well as other data from the time when a malfunction occurred.

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

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

HINT

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

Scheme 226

HINT

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

1. Check throttle control motor (See «ON-VEHICLE INSPECTION»(ref-229199-S10226504942006042000000) ). NG: Replace throttle body (See «REMOVAL»(ref-229199-S19474766672006042000000) ). OK: Go To Next Step.
2. Check for open and short in harness and connector between throttle control motor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Visually check throttle valve. CHECK: Check the area between the throttle valve and the housing for foreign objects. Also, check if the valve can open and close smoothly. NG: Remove foreign object and clean throttle body. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

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

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

HINT

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

Scheme 227

HINT

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

1. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check the area between the throttle valve and the housing for foreign objects. Also, check if the valve can open and close smoothly. NG: Remove foreign object and clean throttle body. OK: Go To Next Step.
2. Check if DTC outputs reoccur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Start and warm up the engine. Run the engine. Fully depress and release the accelerator pedal in a moment. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to No DTC output A DTC P2111 or P2112 output reoccurs B B: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). A: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ).

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

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

HINT

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

Scheme 228

Scheme 229

HINT

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

Scheme 230

Scheme 231

1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse from the engine room No. 1 R/B. CHECK: Check the continuity of the ETCS fuse. OK: Continuity NG: Check for short in all harness and components connected to ETCS fuse. OK: Go To Next Step.
2. Check voltage between terminal +BM of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). CHECK: Measure the voltage between terminal +BM of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Check for intermittent problems (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). NG: Go To Next Step.
3. Check for open and short in harness and connector between battery and ETCS fuse, ETCS fuse and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check engine room No. 1 R/B.

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

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

Scheme 232

HINT

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

1. Are there any other codes (besides DTC P2119) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P2119 A "P2119" and other DTC B HINT: If any other codes besides P2119 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). A: Go To Next Step.
2. Check if DTC outputs reoccur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Start and warm up the engine. Run the engine at idle for 15 seconds or more. Perform the stall test. Move the shift lever to D Position and fully depress the accelerator pedal for 5 seconds. Then release the pedal for 5 seconds or more. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. OK: No DTC output. OK: System is normal. NG: Replace throttle body.

HINT

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

Hand-held tester

Scheme 233

Scheme 234

Scheme 235

Scheme 236

1. Connect hand-held tester, read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menu: 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 SENSOR DATA Accelerator pedal VPA VPA2 Released 0.5 to 1.1 V 0.9 to 2.3 V Depressed 3.0 to 4.6 V 3.4 to 5.0 V OK: Go to step 6 . NG: Go To Next Step.
2. Check accelerator pedal position sensor (See «ON-VEHICLE INSPECTION»(ref-229199-S10226504942006042000000) ). NG: Replace accelerator pedal assembly. OK: Go To Next Step.
3. Check voltage between terminals VCPA and EPA, VPTK and EPTK of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VCPA and EPA, VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
4. Check voltage between terminals VPA and EPTK, and VPA2 and EPA of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPTK, and VPA2 and EPA of the ECM connector. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
5. Check for open and short in harness and connector between accelerator pedal position sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
6. Are there any other codes (besides DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138) being output? PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC using the hand-held tester. RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 are output again A No DTC output B B: System is OK. A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 237

Scheme 238

Scheme 239

1. Check accelerator pedal position sensor (See «ON-VEHICLE INSPECTION»(ref-229199-S10226504942006042000000) ). NG: Replace accelerator pedal assembly. OK: Go To Next Step.
2. Check voltage between terminals VCPA and EPA, VPTK and EPTK of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VCPA and EPA, VPTK and EPTK of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
3. Check voltage between terminals VPA and EPTK, and VPA2 and EPA of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPTK, and VPA2 and EPA of the ECM connector. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
4. Check for open and short in harness and connector between accelerator pedal position sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
5. Are there any other codes (besides DTC P2120, P2122, P2123, P2125, P2127, P2128 or P2138) being output? PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC RESULT: DTC OUTPUT REFERENCE Display (DTC Output) Proceed to P2120, P2122, P2123, P2125, P2127, P2128 and/or P2138 are output again A No DTC output B B: System is OK. A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

HINT

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

Hand-held tester

Scheme 240

Scheme 241

Scheme 242

1. Connect hand-held tester, read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menu: 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 SENSOR DATA Accelerator pedal VPA VPA2 Released 0.5 to 1.1 V 0.9 to 2.3 V Depressed 3.0 to 4.6 V 3.4 to 5.0 V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
2. Check accelerator pedal position sensor (See «ON-VEHICLE INSPECTION»(ref-229199-S10226504942006042000000) ). NG: Replace accelerator pedal assembly. OK: Go To Next Step.
3. Check voltage between terminals VPA and EPTK, and VPA2 and EPA of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPTK, and VPA2 and EPA of the ECM connector. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
4. Check for open and short in harness and connector between accelerator pedal position sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace accelerator pedal assembly.

OBD II scan tool (excluding hand-held tester)

Scheme 243

Scheme 244

1. Check voltage between terminals VPA and EPTK, and VPA2 and EPA of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VPA and EPTK, and VPA2 and EPA of the ECM connector. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Go To Next Step.
2. Check for open and short in harness and connector between accelerator pedal position sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace accelerator pedal assembly.

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

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

Scheme 245

Scheme 246

Scheme 247

Scheme 248

Scheme 249

1. Check voltage between terminals + B and E1 of ECM connector. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals +B and E1 of the ECM connector. OK: Voltage: 9 to 14 V OK: Proceed to next circuit inspection shown in the Problem symptoms table (See «PROBLEM SYMPTOMS»(ref-229176-S38343725702006042000000) ). NG: Go To Next Step.
2. Check for open in harness and connector between terminal E1 of ECM and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Check voltage between terminal IGSW of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGSW of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Go to step 6 . NG: Go To Next Step.
4. Check IGN fuse. PREPARATION: Remove the IGN fuse from the driver side J/B. CHECK: Check the continuity of the IGN fuse. OK: Continuity NG: Check for short in all harness and components connected to IGN fuse. OK: Go To Next Step.
5. Check ignition switch (See «IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH»(ref-229387) ). NG: Replace ignition switch. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ).
6. Check voltage between terminal MREL of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal MREL of the ECM connector and body ground. OK: Voltage: 9 to 14 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). OK: Go To Next Step.
7. Check EFI fuse of engine room No. 1 R/B. NG: Check for short in all harness and components connected to EFI fuse. OK: Go To Next Step.
8. Check EFI main relay (Marking: EFI) (See «EFI MAIN RELAY»(ref-229199-S11232095472006042000000) ). NG: Replace EFI main relay. OK: Go To Next Step.
9. Check for open and short in harness and connector between terminal M-REL of ECM and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Check and repair harness or connector between EFI fuse and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ).

The fuel pump speed is controlled at 3 steps (high speed, medium speed, low speed) by the condition of the engine (starting, idling, light load, heavy load), when the engine starts (STA ON) or carries heavy loads with engine speed high, and the ECM sends a Hi signal (about 3.8 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Hi voltage (battery positive voltage) to the fuel pump so that the fuel pump operates at high speed. When the engine carries a heavy load at the low speed, the ECM sends a Mid signal (about 2.5 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Mid voltage (about 10 V) to the fuel pump so that the fuel pump operates at medium speed.

When the engine is idling or carries a light load, the ECM sends a Low signal (about 1.3 V) to the fuel pump ECU (FPC terminal). The fuel pump ECU then outputs Low voltage (about 8.5 V) to the fuel pump so that the fuel pump operates at low speed.

Scheme 250

Scheme 251

Scheme 252

1. Connect hand-held tester, and check operation of fuel pump (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). OK: Go to step 7 . NG: Go To Next Step.
2. Check voltage of fuel pump ECU power source. PREPARATION: Remove the luggage compartment trim cover (See «FUEL PUMP ECU»(ref-229199-S01092034792006042000000) ). Disconnect the fuel pump ECU connector. Turn the ignition switch ON. CHECK: Measure the voltage between terminal 10 of the fuel pump ECU connector and body ground. OK: Voltage: 9 to 14 V NG: Check for open and short in harness and connector between EFI main relay (Marking: EFI) and fuel pump ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). OK: Go To Next Step.
3. Check voltage between terminals 5 and 8 of fuel pump ECU connector. PREPARATION: Remove the luggage compartment trim cover (See «FUEL PUMP ECU»(ref-229199-S01092034792006042000000) ). Disconnect the fuel pump ECU connector. CHECK: Measure the voltage between terminals 5 and 8 of the fuel pump ECU connector when the ignition switch is turned to the START position. OK: Voltage: 3.3 to 4.3 V OK: Go to step 5 . NG: Go To Next Step.
4. Check for open and short in harness and connector between terminal FPC of ECM and terminal 8 of fuel pump ECU, and terminal 5 of fuel pump ECU and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).
5. Check fuel pump (See «FUEL PUMP»(ref-229199-S00004665932006042000000) ). NG: Repair or replace fuel pump. OK: Go To Next Step.
6. Check for open and short in harness and connector between terminal 7 of fuel pump ECU and fuel pump, and terminal 6 of fuel pump ECU and fuel pump (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace fuel pump ECU.
7. Check for open and short in harness and connector between terminal DI of ECM and terminal 9 of fuel pump ECU (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to increase the intake efficiency (ACIS: Acoustic Control Induction System).

When the engine speed is 2,500 RPM or less or 4,900 RPM or more and the throttle valve opening angle is 60° or more, the VSV is OFF, so that the IACV is open. All the other times, the ECM turns the VSV ON and closes the IACV.

Scheme 253

Scheme 254

Hand-held tester

Scheme 255

1. Connect hand-held tester, and check operation of VSV for ACIS. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the ACTIVE TEST mode on the hand-held tester. CHECK: Check operation of the VSV when the VSV is operated by the hand-held tester. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air from port E flows out through the air filter. OK: Go to step 4 . NG: Go To Next Step.
2. Check VSV for ACIS (See «VSV FOR ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)»(ref-229199-S21613637122006042000000) ). NG: Replace VSV for ACIS. OK: Go To Next Step.
3. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
4. Check vacuum hoses between intake manifold and intake air control valve. CHECK: Check that the vacuum hoses are: Connected correctly. Are not loose or disconnected. Do not have cracks, holes or damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
5. Check intake air control valve (See «ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)»(ref-229199-S05145087092006042000000) ). NG: Replace intake air control valve. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 256

1. Check VSV for ACIS (See «VSV FOR ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)»(ref-229199-S21613637122006042000000) ). NG: Replace VSV for ACIS. OK: Go To Next Step.
2. Check voltage between terminal ACIS of ECM connector and body ground. PREPARATION: Remove the ECM hood (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal ACIS of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Go to step 4 . NG: Go To Next Step.
3. Check for open and short in harness and connector between EFI main relay (Marking: EFI) and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step.
4. Check vacuum hoses between intake manifold and intake air control valve. CHECK: Check that the vacuum hoses are: Connected correctly. Are not loose or disconnected. Do not have cracks, holes or damages. NG: Repair or replace vacuum hose. OK: Go To Next Step.
5. Check intake air control valve (See «ACOUSTIC CONTROL INDUCTION SYSTEM (ACIS)»(ref-229199-S05145087092006042000000) ). NG: Replace intake air control valve. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).

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 below to determine the cause of the problem.

Scheme 257

HINT

Troubleshoot each trouble symptom in accordance with the chart below.

MIL INSPECTION CHART

Scheme 258

1. Clear DTC. Connect the hand-held tester or the OBD II scan tool to the DLC 3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Read the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Clear the DTC (See «PRE-CHECK»(ref-229176-S29341277952006042000000) ). Check that MIL does not light up. Standard: MIL does not light up OK: Repair circuit indicated by output code (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-229176-S14114177042006042000000) ). NG: Go To Next Step.
2. Check Harness and connector (Check for short in wire harness). Disconnect the E5 ECM connector. Turn the ignition switch ON. Check that MIL does not light up. Standard: MIL does not light up OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ). NG: Check and repair harness and connector between combination meter and ECM.
3. Check that MIL lights up. Check that MIL lights up when turning the ignition switch ON. Standard: MIL lights up OK: System is OK. NG: Go To Next Step.
4. Inspect combination meter assy (MIL circuit). See PROBLEM SYMPTOMS TABLE under «COMBINATION METER»(ref-229385-S05371187692006041500000) troubleshooting. NG: Repair or replace bulb or combination meter assembly. OK: Check and repair harness and connector between combination meter and ECM.

Terminal TC and CG are located in the DLC1. When connecting these terminals, DTCs in normal mode or test mode can be read through the MIL flashing in the combination meter.

Scheme 259

HINT

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

Scheme 260

1. Check voltage between terminals TC and E1 of DLC1. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals TC and E1 of the DLC3. OK: Voltage: 9 to 14 V OK: Go to step 3 . NG: Go To Next Step.
2. Check continuity between terminal E1 of DLC1 and body ground. NG: Repair or replace harness or connector. OK: Go To Next Step.
3. Check for open and short circuit in harness and connector between ECM and DLC1 (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-229346-S26338991582006041400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-229199-S11132873912006042000000) ).