Engine Controls - (2UZ-FE) - Diagnostics: Diagnosis Toyota Tundra I рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the following procedure.

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1. DIAGNOSIS SYSTEM Description When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand-held tester. Various data output from the vehicle's ECM can then be read. OBD II regulations require that the vehicle's 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-181813-S15771513212005080400000) ). If the malfunction does not reoccur in 3 consecutive trips, the MIL goes off automatically but the DTCs remain recorded in the ECM memory. To check the DTC, connect the hand-held tester or OBD II scan tool to the Data Link Connector 3 (DLC3) of the vehicle. The hand-held tester or OBD II scan tool also enables you to erase the DTC and check the freeze frame data and various forms of engine data (see the instruction manual for the OBD II scan tool or the hand-held tester). The DTC includes SAE controlled codes and manufacturer controlled codes. SAE controlled codes must be set according to the SAE, while manufacturer controlled codes can be set by a manufacturer with certain restrictions (see the DTC chart «DIAGNOSTIC TROUBLE CODE CHART»(ref-181813-S15771513212005080400000) ). The diagnosis system operates in "normal mode" during normal vehicle use. In "normal mode", 2 trip detection logic * is used to ensure accurate detection of malfunctions. A "check mode" is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (see step 3 ). * 2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory. This is known as 1st trip detection. If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate. This is known as 2nd trip detection. Freeze frame data: The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determining if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred. Priorities for troubleshooting: When multiple DTCs occur, find out the order in which the DTCs should be inspected by checking the component's DTC chart. If no instructions are written in the DTC chart, check DTCs in the following order of priority: DTCs other than fuel trim malfunction DTCs (P0171, P0172, P0174 and P0175) and misfire DTCs (P0300 to P0308). Fuel trim malfunction DTCs (P0171, P0172, P0174 and P0175). 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. TERMINAL SYMBOL NAME AND RESULT Symbol Name Result (Terminal No.) (Reference terminal) (Condition) SIL Bus "+" line Pulse generation (7) (5 - Signal ground) (During transmission) CG Chassis ground 1 ohm or less (4) (Body ground) (Always) SG Signal ground 1 ohm or less (5) (Body ground) (Always) BAT Battery positive 9 to 14 V (16) (Body ground) (Always) HINT: If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the OBD II scan tool or the hand-held tester to the DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool 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. 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 «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). When the engine is started, the MIL should not illuminate. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system.
2. DTC CHECK (Normal Mode) NOTE: If no DTC appears in normal mode: On the OBD II scan tool or the hand-held tester check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979). When the diagnosis system is changed from normal mode to check mode or vice-versa, all DTCs and freeze frame data recorded in normal mode will be erased. Before changing modes, always check and make a note of DTCs and freeze frame data. Checking DTCs using the OBD II scan tool or hand-held tester. Connect the OBD II scan tool or the hand-held tester to DLC3. Turn the ignition switch ON. Use the OBD II scan tool or the hand-held tester to check the DTCs and freeze frame data and then write them down. For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. For the OBD II scan tool, see its instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181813-S15771513212005080400000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand-held tester) to check the DTCs, use the normal mode. For DTCs chart subject to "2 trip detection logic", perform either of the following actions. Check the pending fault code: For the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / PENDING CODES. Turn the ignition switch OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated twice, the MIL come on and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clearing the DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester For the hand-held tester: 1) enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs not using the OBD II scan tool or the hand-held tester. Remove the EFI NO. 1 and ETCS fuses from the engine room J/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure.
3. DTC CHECK (Check Mode) HINT: Hand-held tester only: Check mode has a higher sensitivity to detect malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. Follow these steps when preparing to use the hand-held tester check mode. Make sure that the items below are true: Battery positive voltage 11 V or more Throttle valve fully closed Transmission in the P or N position A/C switched OFF Turn the ignition switch OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Change the ECM to check mode with the 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.
4. Clearing DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual.
5. Clearing the DTCs without using the OBD II scan tool or the hand-held tester. Remove the EFI No. 1 and ETCS fuse from the engine room J/B for more than 60 seconds, or disconnect the battery terminal for more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure.
6. FAIL-SAFE CHART If any of the following code is recorded, the ECM enters fail-safe mode.
7. 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 4 or 5 ). Set the check mode (see step 3 ). Perform a simulation test (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). Check the connector and terminal (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). Wiggle the harness and connector (see «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
8. 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 «STARTERS»(ref-163557) and continue to troubleshoot. YES: Go to next step Does engine start? NO: Go to step 7 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 air filter. OK: Go to next step Check idle speed. PREPARATION: Warm up the engine to the normal operating temperature. Switch off all the accessories. Switch off the A/C. Connect the OBD II scan tool or hand-held tester to the DLC3 of the vehicle. CHECK: Use the CURRENT DATA to check the idle speed. OK: Idle speed: 650 - 750 RPM NG: Proceed to problem symptoms table See «PROBLEM SYMPTOMS TABLE»(ref-181813-S31416712262005080400000) . OK: Go to next step Check ignition timing. PREPARATION: Warm up the engine to the normal operating temperature. Keep the engine speed at idle. Using SST, connect terminals TC and CG of the DLC3. SST 09843-18040 Using a timing light, connect the tester to the ignition coil connector wire (see «IGNITION TIMING (2UZ-FE)»(ref-182829) ). CHECK: Check the ignition timing. OK: Ignition timing: 10° BTDC at idle NG: Proceed to «IGNITION (2UZ-FE) SPECIFICATIONS»(ref-181941) and continue to trouble-shoot. OK: Proceed to problem symptoms table See «PROBLEM SYMPTOMS TABLE»(ref-181813-S31416712262005080400000) . Check fuel pressure. PREPARATION: Be sure that enough fuel is in the tank. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Use the ACTIVE TEST mode to operate the fuel pump. Please refer to the hand-held tester operator's manual for further details. If you have no hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (see «FUEL PUMP»(ref-181796-S34939073812006080100000) ). CHECK: Check that the pulsation damper screw rises up when the fuel pump operates. HINT: At this time, you will hear the fuel flowing noise. NG: Proceed to «FUEL PUMP»(ref-181796-S34939073812006080100000) and continue to trouble-shoot. OK: Go to next step Check for spark. PREPARATION: Remove the ignition coil from the spark plug. Remove the spark plug. Install the spark plug to the ignition coil. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, don't crank the engine for more than 5-10 seconds at a time. NG: Proceed to «IGNITION (2UZ-FE) SPECIFICATIONS»(ref-181941) , and continue to troubleshoot. OK: Proceed to problem symptoms table See «PROBLEM SYMPTOMS TABLE»(ref-181813-S31416712262005080400000) .
9. DATA LIST HINT: Using the hand-held tester DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten labor time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST. According to the display on tester, read the "DATA LIST". * 1: If no conditions are specifically stated for "Idling", it means the shift lever is in the N or P position, the A/C switch is OFF and all accessory switches are OFF.
10. 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".
11. DEFINITION OF TERMS TERMS DEFINITION Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). Related DTCs Diagnostic code Typical enabling condition Preconditions that allow the ECM to detect malfunctions. 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 cycle.
12. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used along with their definitions. TOYOTA/LEXUS NOTE DEFINITION 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 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
13. The monitor will run whenever the following DTCs are not present (Monitor disablement List) 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.
14. O2S TEST RESULT Introduction The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBDII 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 it taken after monitoring and therefore it is not dynamic. In this article, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items: TEST ID (a code applied to each TEST DATA) Description of TEST DATA Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.) Unit Standard Value If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon. How to read O2S test result using hand-held tester Connect the hand-held tester to the DLC3. On the tester screen, select the following menus: DIAGNOSIS / GARB OBDII / O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed. Select the desired O2S and press ENTER. The following screen will appear. Press HELP and *** 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 %
15. CHECKING MONITOR STATUS NOTE: The Monitor Status is not applicable to the heated oxygen sensor (HO2S). The HO2S status can be checked with O2S TEST RESULT. INTRODUCTION The purpose of the monitor result (mode 6) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, EVAP and thermostat. The monitor result allows the OBD scan tool to display the monitor status, test value and test limit. The monitor status indicates whether the component is functioning normally or not (PASS or FAIL). The test value is the value that was used to determine the monitor status. When the test value is inside the test limit, the ECM determines the component is functioning normally (PASS). If the test value is outside the test limit, the ECM determines the component is malfunctioning (FAIL). A problem in these components/systems can be found by comparing the test value and test limit. The monitor result information is included under "MONITOR RESULT" in the DTC tests. PROCEDURE NOTE: The monitor result and test value are cleared when the ignition switch is turned OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Clear the DTCs. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN (see «READINESS MONITOR DRIVE PATTERN»(ref-181813-S33215699462005080400000) ). Select from the tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name. INCMP: The component has not been monitored yet. PASS: The component is functioning normally. FAIL: The component is malfunctioning. Confirm that the component is set to either PASS or FAIL. Select the component (Label) and press ENTER. The accuracy test value appears when the monitor result is either PASS or FAIL. VAL The test value LMT: The test limit TLT: The test limit type. Either 0 or 1 is displayed. If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit. Compare the test value with the test limit. The test value is usually significantly higher or lower than the test limit. If the test value is on the borderline of the test limit, there is a potential malfunction in the component. HINT: The monitor result might on rare occasions be PASS even if the MIL is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

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

DIAGNOSTIC TROUBLE CODES

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HINT

Each ECM terminals standard voltage is shown in the table below. In the table, first follow the information under "condition". Next look under "Symbols (Terminals No.)" for the terminals to be inspected. The standard voltage between the terminals is shown under "Standard".

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CIRCUIT DESCRIPTION

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 which its 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 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.

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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.

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HINT

1. BANK 1 REFERS TO BANK THE INCLUDES CYLINDER NO. 1.
2. BANK 2 REFERS TO BANK THAT DOES NOT INCLUDES CYLINDER NO. 1.
3. SENSOR 1 REFERS TO THE SENSOR CLOSER TO THE ENGINE ASSEMBLY.
4. SENSOR 2 REFERS TO THE SENSOR FARTHER AWAY FROM THE ENGINE ASSEMBLY.

INSPECTION PROCEDURE

HINT

Read freeze frame data using hand-held tester or OBD II scan tool, as 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.

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1. CHECK RESISTANCE OF HEATED OXYGEN SENSOR HEATER. Preparation: Disconnect The H3, H4, H5 Or H6 Heated Oxygen Sensor Connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: HEATED OXYGEN SENSOR HEATER RESISTANCE CHECK Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) - +B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: REPLACE HEATED OXYGEN SENSOR. OK: GO TO NEXT STEP
2. CHECK EFI RELAY. Preparation: Remove the EFI relay from the engine room j/b. CHECK: Inspect the EFI relay. OK: EFI RELAY RESISTANCE CHECK Terminal No. Condition Specified Condition 1 - 2 Constant 60 - 90 ohm 3 - 5 Constant More than 10kohm 3 - 5 Apply B+ between terminals 1 and 2 Less than 1 ohm NG: REPLACE EFI RELAY. OK: GO TO NEXT STEP
3. CHECK VOLTAGE BETWEEN TERMINALS HT1A, HT2A, HT1B, HT2B OF ECM CONNECTORS AND BODY GROUND. PREPARATION: Turn the ignition switch on. CHECK: Measure the voltage of the ECM connector terminals as shown in the chart below. HINT: Connect terminal HT1A to the bank 1 sensor 1. Connect terminal HT1B to the bank 1 sensor 2. Connect terminal HT2A to the bank 2 sensor 1. Connect terminal HT2B to the bank 2 sensor 2. OK: OK: REPLACE ECM (SEE «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). NG: CHECK AND REPAIR HARNESS OR CONNECTOR BETWEEN EFI RELAY AND HEATED OXYGEN SENSOR, AND HEATED OXYGEN SENSOR AND ECM (SEE «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

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

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

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

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HINT

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

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HINT

1. If different DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may be open.
2. Read freeze frame data using hand-held tester or OBD II scan tool, as 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.

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1. Read value of mass air flow rate on hand-held tester. 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 the hand-held tester main switch ON. Start the engine. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAF. CHECK: Read the mass air flow rate on the OBD II scan tool or the hand-held tester. RESULT: AIR FLOW RATE RESULT Air Flow Rate (gm/s) Proceed to 0.0 A 271.0 or more B Between 1 and 270.0 ( (1) ) C (1) The value must be changed when the throttle valve is opened or closed. B: Go to step 5 C: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). A: Go to next step
2. Check voltage of mass air flow meter power source. PREPARATION: Disconnect the M1 mass air flow meter connector. Turn the ignition switch ON. CHECK: Measure voltage between terminal of the mass air flow meter connector and body ground. OK: MASS AIR FLOW METER TERMINAL VOLTAGE CHECK Tester Connection Specified Condition +B (M1-3) - Body ground 9 to 14 V NG: Go to step 5 OK: Go to next step
3. Ch and E2G of ECM connector. PREPARATION: Start the engine. CHECK: Measure the voltage between the specified terminal of the E7 ECM connector. HINT: The shift position should be P or N and the A/C switch should be turned OFF. OK: ECM TERMINAL VOLTAGE CHECK Tester Connection Condition Specified Condition VG (E7-30) - E2G (E7-29) Engine is idling 0.5 to 3.0 V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). NG: Go to next step
4. Check for open and short in harness and connector between mass air flow meter and ECM. PREPARATION: Disconnect the M1 mass air flow meter connector. Disconnect the E7 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION CHECK Tester Connection Specified Condition VG (M1-5) - VG (E7-30) Below 1 ohm E2G (M1-4) - E2G (E7-29) Below 1 ohm VG (M1-5) or VG (E7-30) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace mass air flow meter.
5. Check continuity between terminal E2G and E2 of ECM connector. Check EFI No. 2 fuse PREPARATION: Remove the EFI NO. 2 fuse from the engine room J/B. CHECK: Check for continuity in the EFI NO. 2 fuse. OK: Continuity Check harness and connector PREPARATION: Install the EFI NO. 2 fuse. Disconnect the M1 mass air flow meter connector. Remove the EFI relay from the engine room J/B. CHECK: Check the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition +B (M1-3) - Engine Room J/B (EFI relay terminal 1) Below 1 ohm +B (M1-3) or Engine room J/B (EFI relay terminal 1) - Body ground 10 kohm or higher NG: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Check ECM power source circuit (See «ECM POWER SOURCE CIRCUIT»(ref-181813-S24375258502005080400000) ). Check continuity between terminal EVG of ECM connector and body ground. CHECK: Check the resistance between terminal of the E7 ECM connector and body ground. OK: ECM TERMINAL RESISTANCE CHECK Tester Connection Specified Condition E2G (E7-29) - Body ground Below 1 ohm NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go to next step Check for open in harness and connector between mass air flow meter and ECM. PREPARATION: Disconnect the M1 mass air flow meter connector. Disconnect the E7 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: TESTER CONNECTOR SPECIFIED CONDITION Tester Connection Specified Condition VG (M1-5) - VG (E7-30) Below 1 ohm E2G (M1-4) - E2G (E7-29) Below 1 ohm VG (M1-5) or VG (E7-30) - Body ground 10 kohm or higher E2G (M1-4) or E2G (E7-29) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace mass air flow meter.

Refer to DTC P0100, P0102 and P0103 DTC P0100 MASS OR VOLUME AIR FLOW CIRCUIT, DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT LOW INPUT, DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT HIGH INPUT .

Scheme 350

HINT

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

1. Are there any other codes (besides DTC P0101) being output? 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 RESULT Display (DTC output) Proceed to "P0101 "and other DTCs A Only P0101 B HINT: If any other codes besides P0101 are output, perform the troubleshooting for those codes first. A: Replace mass air flow meter. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181813-S15771513212005080400000) ).

The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAP) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (Scheme 351)

The intake air temperature sensor is connected to the ECM (see below). 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 voltage at terminal THA (THAR) also changes. Based on this signal, the ECM increases the fuel injection volume to improve the driveability during cold engine operation.

Scheme 351

Scheme 352

HINT

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

TEMPERATURE DISPLAY MALFUNCTION CHECK

HINT

1. If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
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, and other data from the time the malfunction occurred.

Scheme 353

Scheme 354

Scheme 355

Scheme 356

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 the hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or the hand-held tester main 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 the hand-held tester. OK: Same as actual intake air temperature. RESULT: INTAKE AIR TEMPERATURE RESULT Temperature Displayed Proceed to -40 °C (-40°F) A 140°C (284°F) or more B OK (Same as present temperature) C HINT: If there is an open circuit, the OBD II scan tool or the hand-held tester indicates -40°C (-40 °F). If there is a 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-181813-S00378289582005080400000) ). A: Go to next step
2. Check for open in harness or ECM. PREPARATION: Disconnect the M1 mass air flow meter connector. Connect terminals 1 and 2 of the mass air flow meter wire harness side 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 the 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 cover. Connect terminals THA and E2 of the ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM 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 the hand-held tester. OK: Temperature value: 140°C (284°F) or more OK: Repair or replace harness or connector. NG: Confirm good connection at ECM. If OK, check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the M1 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 the 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: Disconnect the E7 ECM 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 the 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-181796-S23719593312006080100000) ).

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

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

HINT

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

Scheme 357

HINT

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

TEMPERATURE DISPLAY MALFUNCTION CHECK

HINT

1. If DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
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, and other data from the time the malfunction occurred.

Scheme 358

Scheme 359

Scheme 360

Scheme 361

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 the 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 the hand-held tester. OK: Same value as actual engine coolant temperature. RESULT: ENGINE COOLANT TEMPERATURE RESULT Temperature Displayed Proceed to -40 °C (-40°F) A 140°C (284°F) or more B OK (Same as present temperature) C HINT: If there is an open circuit, OBD II scan tool or hand-held tester indicates -40°C (-40°F). If there is a short circuit, OBD II scan tool or hand-held tester indicates 140°C (284°F) or more. B: Go to step 4 C: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). A: Go to next step
2. Check for open in harness or ECM. PREPARATION: Disconnect the E2 ECT sensor connector. Connect terminals 1 and 2 of the ECT sensor wire harness side 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 the hand-held tester. OK: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace engine coolant temperature sensor. NG: Go to next step
3. Check for open in harness or ECM. PREPARATION: Disconnect the E2 ECT sensor connector. Connect terminals THW and E2 of the ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM 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 the hand-held tester. OK: 140°C (284°F) or more OK: Repair or replace harness or connector. NG: Confirm good connection at ECM. If OK, check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the E2 ECT 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 the hand-held tester. OK: -40 °C (-40°F) OK: Replace engine coolant temperature sensor. NG: Go to next step
5. Check for short in harness or ECM. PREPARATION: Disconnect the E7 ECM 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 the hand-held tester. OK: -40 °C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

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

Scheme 362

HINT

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

HINT

1. If DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
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, and other data from the time the malfunction occurred.

Scheme 363

Scheme 364

Scheme 365

Scheme 366

Scheme 367

Scheme 368

1. Connect hand-held tester, and read the voltage for throttle position sensor data. PREPARATION: Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / THROTTLE POS and THROTTLE POS #2. CHECK: Read voltage value displayed on the hand-held tester. OK: RESULT: B: Go to step 5 A: Go to next step
2. Check for open and short in harness and connector between ECM and throttle position sensor. PREPARATION: Disconnect the T14 throttle actuator connector. Disconnect the E7 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness and connector. OK: Go to next step
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Disconnect the T14 throttle control motor and sensor connector. Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminals of the E7 ECM connector. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition VC (E7-18) - E2 (E7-28) 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go to next step
4. Replace throttle body (See «REPLACEMENT»(ref-181796-S24491942472006080100000) ). Go
5. Check if DTC output recur. PREPARATION: Clear the DTC (see «PRE-CHECK»(ref-181813-S00378289582005080400000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC (see «PRE-CHECK»(ref-181813-S00378289582005080400000) ). RESULT: DTC OUTPUT RESULT DISPLAY Display (DTC Output) Proceed to "P0120, P0122, P0123, P0220, P0222, P0223 and/or P2135" are output again A No DTC output B B: System is OK. A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

HINT

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

1. Replace throttle control motor and sensor (See «REPLACEMENT»(ref-181796-S24491942472006080100000) ).

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

Scheme 369

HINT

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

1. Are there any other codes (besides DTC P0125) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. CHECK: Read the DTCs using the hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT RESULT DISPLAY Display (DTC output) Proceed to P0125 A "P0125" and other DTCs B HINT: If any other codes besides "P0125" are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181813-S15771513212005080400000) ). A: Go to next step
2. Inspect thermostat (See «THERMOSTAT (2UZ-FE)»(ref-181805) ). NG: Replace thermostat (See «THERMOSTAT (2UZ-FE)»(ref-181805) ). OK: Go to next step
3. Check cooling system. CHECK: Check that there is detect 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.

If the Engine Coolant Temperature (EOT) does not reach 75°C (167°F) despite sufficient warm-up time has elapsed.

Scheme 370

Scheme 371

The ECM estimates the coolant temperature based on starting temperature, engine loads, and engine speeds. The ECM then compares the estimated temperature with the actual ECT. When the estimated coolant temperature reaches 75°C (167°F), the ECM checks the actual ECT. If the actual ECT is less than 75°C (167°F), the ECM will interpret this as a fault in the thermostat or engine cooling system and set a DTC.

Scheme 372

Scheme 373

HINT

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

1. Check cooling system. CHECK: Check that there is a defect in the cooling system which causes over-cool, such as abnormal radiator fan operation, modified cooling system and so on. NG: Repair or replace cooling system. OK: Go to next step
2. Check thermostat (See «THERMOSTAT (2UZ-FE)»(ref-181805) ). NG: Replace thermostat (See «THERMOSTAT (2UZ-FE)»(ref-181805) ). OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

Refer to DTC P0031 DTC P0031: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1); DTC P0032: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1); DTC P0037: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2); DTC P0038: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2); DTC P0051: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 1); DTC P0052: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 1); DTC P0057: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 2); DTC P0058: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 2) .

Scheme 374

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not includes cylinder No. 2.
3. Sensor 1 refers to the sensor closer to the engine assembly.
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 375

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 376

Scheme 377

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

Front HO2S voltage monitor

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

O2S TEST RESULT

HINT

Hand-held tester only

The 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 %. 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

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

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

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 about 20 seconds delay in the sensor 2 (rear sensor).

Scheme 378

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. at the time of the malfunction.
3. A high heated oxygen sensor (sensor 1) voltage (0.55 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 379

Scheme 380

Scheme 381

Scheme 382

Scheme 383

Scheme 384

1. Are there any other codes (besides DTC P0130, P0150, P2195, P2197, P2196 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 RESULT DISPLAY Display (DTC Output) Proceed to "P0130, P0150, P2195, P2196, P21 97 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-181813-S15771513212005080400000) ). 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: Check the output voltage of the heated oxygen sensor during idling the OBD II scan tool or hand-held tester. OK: Heated oxygen sensor output voltage: Alternates repeatedly between less than 0.4 V and more than 0.5 V (Scheme 379) OK: Go to step 9 NG: Go to next step
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: HEATED OXYGEN SENSOR TERMINALS RESISTANCE CHECK Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) -+B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: Replace heated oxygen sensor. OK: Go to next step
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: EFI RELAY TERMINAL RESISTANCE CHECK Terminal No. Condition Specified Condition 1 - 2 Constant 60 - 90 ohm 3 - 5 Constant More than 10kohm 3 - 5 Apply B+ between terminals 1 and 2 Less than 1 ohm 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. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION & SPECIFIED CONDITIONS Tester Connection Specified Condition OX2 (H3-3) - OX1A (E6-23) Below 1 ohm HTL (H3-1) - HT1A (E6-4) Below 1 ohm OXL2 (H4-3) - 0X1 B (E6-29) Below 1 ohm HTL2 (H4-1) - HT1B (E6-5) Below 1 ohm OX (H5-3) - OX2A (E6-22) Below 1 ohm HT (H5-1) - HT2A (E6-33) Below 1 ohm OXR2 (H6-3) - OX2B (E6-21) Below 1 ohm HTR2 (H6-1) - HT2B (E6-25) Below 1 ohm OX2 (H3-3) or OX1A (E6-23) - Body ground 10 kohm or higher HTL(H3-1)or HT1A (E6-4) - Body ground 10 kohm or higher OXL2 (H4-3) or OX1B (E6-29) - Body ground 10 kohm or higher HTL2 (H4-1) or HT1B (E6-5) - Body ground 10 kohm or higher OX (H5-3) or OX2A (E6-22) - Body ground 10 kohm or higher HT (H5-1) or HT2A (E6-33) - Body ground 10 kohm or higher OXR2 (H6-3) or OX2B (E6-21) - Body ground 10 kohm or higher HTR2 (H6-1) or HT2B (E6-25) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go to next step
6. Check air induction system (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). 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-181796-S34939073812006080100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). OK: Go to next step
8. Check injector injection (See «INSPECTION»(ref-181796-S03621786812006080100000) ). NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000) ). OK: Replace heated oxygen sensor.
9. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go
10. Is there DTC P0130, P0150, P2195, P2196, P2197 or P2198 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

Refer to DTC P0031 DTC P0031: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1); DTC P0032: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1); DTC P0037: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2); DTC P0038: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2); DTC P0051: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 1); DTC P0052: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 1); DTC P0057: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 2); DTC P0058: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 2) .

Scheme 385

HINT

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

Scheme 386

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 gases. 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 387

Scheme 388

Scheme 389

Scheme 390

Refer to PRE-CHECK for detailed information.

Front HO2S slow slope monitor

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

TEXT ID $ 03 & $04 DESCRIPTION DATA

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

TEST ID $31, $32 DESCRIPTION DATA

Front HO2S frequency monitor (idling)

If the $38 is out of the standard value, the ECM interprets this as a malfunction.

TEST ID $34 DESCRIPTION DATA

Front HO2S frequency monitor (cruise)

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

TEST ID $90 DESCRIPTION DATA

HINT

Hand-held tester only

The 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 %. 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

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

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

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

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

Scheme 391

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 (0.55 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 392

Scheme 393

Scheme 394

Scheme 395

Scheme 396

Scheme 397

Scheme 398

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 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-181813-S15771513212005080400000) ). 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: Check the output voltage of the heated oxygen sensor during idling the OBD II scan tool or hand-held tester. OK: Heated oxygen sensor output voltage: Alternates between less than 0.4 V and more than 0.55 V, and period of "t" must exist less than 0.9 seconds (Scheme 392) OK: Go to step 9 NG: Go to next step
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) -+B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: Replace heated oxygen sensor. OK: Go to next step
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step
5. Check for open and short in harness and connector between ECM and heated oxygen sensor. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION & SPECIFIED CONDITION Tester Connection Specified Condition OX2 (H3-3) - OX1A (E6-23) Below 1 ohm HTL (H3-1) - HT1A (E6-4) Below 1 ohm OXL2 (H4-3) - 0X1 B (E6-29) Below 1 ohm HTL2 (H4-1) - HT1B (E6-5) Below 1 ohm OX (H5-3) - OX2A (E6-22) Below 1 ohm HT (H5-1) - HT2A (E6-33) Below 1 ohm OXR2 (H6-3) - OX2B (E6-21) Below 1 ohm HTR2 (H6-1) - HT2B (E6-25) Below 1 ohm OX2 (H3-3) or OX1A (E6-23) - Body ground 10 kohm or higher HTL (H3-1) or HT1A (E6-4) - Body ground 10 kohm or higher OXL2 (H4-3) or OX1B (E6-29) - Body ground 10 kohm or higher HTL2 (H4-1) or HT1B (E6-5) - Body ground 10 kohm or higher OX (H5-3) or OX2A (E6-22) - Body ground 10 kohm or higher HT (H5-1) or HT2A (E6-33) - Body ground 10 kohm or higher OXR2 (H6-3) or OX2B (E6-21) - Body ground 10 kohm or higher HTR2 (H6-1) or HT2B (E6-25) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go to next step
6. Check air induction system (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). 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-181796-S34939073812006080100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). OK: Go to next step
8. Check injector injection (See «INSPECTION»(ref-181796-S03621786812006080100000) ). NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000). OK: Replace heated oxygen sensor.
9. Perform confirmation driving pattern (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-181813-S32210917432005080400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go
10. Is there DTC P0133 or P0153 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: Replace heated oxygen sensor.

Refer to DTC P0031 DTC P0031: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1); DTC P0032: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1); DTC P0037: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2); DTC P0038: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2); DTC P0051: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 1); DTC P0052: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 1); DTC P0057: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 2); DTC P0058: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 2) .

Scheme 399

HINT

1. Bank 1 refers to bank that includes cylinder No. 1.
2. Bank 2 refers to bank that does not includes 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

The 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 %. 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

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

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

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 about 20 seconds delay in the sensor 2 (rear sensor).

Scheme 400

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 (0.55 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 401

Scheme 402

Scheme 403

Scheme 404

Scheme 405

Scheme 406

1. Are there any other codes (besides DTCs 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 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-181813-S15771513212005080400000) ). A: Go to next step
2. Connect OBD II scan tool or hand-held tester, and read value for voltage output of heated oxygen sensor (bank 1, 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 output a RICH signal (0.45 V or more) at least once. OK: Go to step 12 NG: Go to next step
3. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go to next step
4. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) -+B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: Replace heated oxygen sensor. OK: Go to next step
5. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step
6. Check for open and short in harness and connector between ECM and heated oxygen sensor. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition OX2 (H3-3) - OX1A (E6-23) Below 1 ohm HTL (H3-1) - HT1A (E6-4) Below 1 ohm OXL2 (H4-3) - 0X1B (E6-29) Below 1 ohm HTL2 (H4-1) - HT1B (E6-5) Below 1 ohm OX (H5-3) - OX2A (E6-22) Below 1 ohm HT (H5-1) - HT2A (E6-33) Below 1 ohm OXR2 (H6-3) - OX2B (E6-21) Below 1 ohm HTR2 (H6-1) - HT2B (E6-25) Below 1 ohm OX2 (H3-3) or OX1A (E6-23) - Body ground 10 kohm or higher HTL (H3-1) or HT1A (E6-4) - Body ground 10 kohm or higher OXL2 (H4-3) or OX1B (E6-29) - Body ground 10 kohm or higher HTL2 (H4-1) or HT1B (E6-5) - Body ground 10 kohm or higher OX (H5-3) or OX2A (E6-22) - Body ground 10 kohm or higher HT (H5-1) or HT2A (E6-33) - Body ground 10 kohm or higher OXR2 (H6-3) or OX2B (E6-21) - Body ground 10 kohm or higher HTR2 (H6-1) or HT2B (E6-25) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go to next step
7. Check whether misfire is occurred or not by monitoring DTC and data list. NG: Perform troubleshooting for misfire (See «DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED, DTC P0305 CYLINDER 5 MISFIRE DETECTED, DTC P0306 CYLINDER 6 MISFIRE DETECTED, DTC P0307 CYLINDER 7 MISFIRE DETECTED, DTC P0308 CYLINDER 8 MISFIRE DETECTED»(ref-181813-S15249405102005080400000) ). OK: Go to next step
8. Check air induction system (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). 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-181796-S34939073812006080100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). OK: Go to next step
10. Check injector injection (See «INSPECTION»(ref-181796-S03621786812006080100000) ) NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000) ). OK: Go to next step
11. Check exhaust system for gas leakage. NG: Repair or replace exhaust gas leakage point. OK: Replace heated oxygen sensor (bank 1, 2 sensor 1).
12. Perform confirmation driving pattern (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-181813-S32210917432005080400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go
13. Are there DTCs P0134 and P0154 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). NO: Go to next step
14. Confirm if vehicle has run out of fuel in past. NO: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: DTCs P0134 and P0154 are caused by running out of fuel.

Refer to DTC P0031 DTC P0031: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1); DTC P0032: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1); DTC P0037: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2); DTC P0038: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2); DTC P0051: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 1); DTC P0052: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 1); DTC P0057: OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 2 SENSOR 2); DTC P0058: OXYGEN SENSOR HEATER CONTROL CIRCUIT HIGH (BANK 2 SENSOR 2) .

Scheme 407

HINT

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

Refer to PRE-CHECK for detailed information.

Rear HO2S voltage monitor

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

TEST ID $07 & $08 DESCRIPTION DATA

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

TEST ID $31, $32 DESCRIPTION DATA

Rear HO2S element monitor

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

TEST ID $81,$84,$85 AND $87 DESCRIPTION DATA

HINT

Hand-held tester only

The 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 %. 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

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

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

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 about 20 seconds delay in the sensor 2 (rear sensor).

Scheme 408

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 B1S1 and 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 409

Scheme 410

Scheme 411

Scheme 412

Scheme 413

Scheme 414

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 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 Display (DTC Output) Proceed to P0136 A "P0136" and other DTCs B HINT: If any other codes besides P0136 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181813-S15771513212005080400000) ). 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. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: TESTER CONNECTION & SPECIFIED CONDITIONS Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) -+B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: Replace heated oxygen sensor. OK: Go to next step
4. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step
5. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). PREPARATION: Disconnect the H4 or H6 heated oxygen sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition OXL2 (H4-3) - OX1B (E6-29) Below 1 ohm HTL2 (H4-1) - HT1B (E6-5) Below 1 ohm OXR2 (H6-3) - OX2B (E6-21) Below 1 ohm HTR2 (H6-1) - HT2B (E6-25) Below 1 ohm OXL2 (H4-3) or OX1B (E6-29) - Body ground 10 kohm or higher HTL2 (H4-1) or HT1B (E6-5) - Body ground 10 kohm or higher OXR2 (H6-3) or OX2B (E6-21) - Body ground 10 kohm or higher HTR2 (H6-1) or HT2B (E6-25) - Body ground4 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace heated oxygen sensor.
6. Perform confirmation driving pattern (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-181813-S32210917432005080400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go
7. Is the DTC P0136 or P0156 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: Replace heated oxygen sensor.

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

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

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

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

Scheme 415

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 416

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

Example

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

Scheme 417

Scheme 418

HINT

Hand-held tester only

The 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 %. 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).

RESULT

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

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

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 about 20 seconds delay in the sensor 2 (rear sensor).

Scheme 419

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, 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 (0.55 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 420

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1. Check air induction system (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). CHECK: Check the air induction system for vacuum leaks. NG: Repair or replace air induction system. OK: Go to next step
2. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go to next step
3. Check injector injection (See «INSPECTION»(ref-181796-S03621786812006080100000) ). NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000) ). 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 prove to terminal VG, and negative (-) tester prove to terminal E2G. Blow air into the mass air flow sensor, and check that the voltage fluctuates. Inspect resistance. Measure the resistance between terminals of the intake air temperature sensor. Resistance: NG: Repair or 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: 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 (warm up or allow to cool down) and repeat the test. Reinstall the engine coolant temperature sensor. NG: Repair or replace engine coolant temperature sensor. OK: Go to next step
6. Check for spark and ignition (See «DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED, DTC P0305 CYLINDER 5 MISFIRE DETECTED, DTC P0306 CYLINDER 6 MISFIRE DETECTED, DTC P0307 CYLINDER 7 MISFIRE DETECTED, DTC P0308 CYLINDER 8 MISFIRE DETECTED»(ref-181813-S15249405102005080400000) ). NG: Repair or replace ignition system. OK: Go to next step
7. Check fuel pressure (See «FUEL PUMP»(ref-181796-S34939073812006080100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and replace fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). OK: Go to next step
8. Check exhaust system for gas leakage. NG: Repair or replace exhaust gas leakage point. OK: Go to next step
9. Check output voltage of heated oxygen sensor (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: Check the output voltage of the heated oxygen sensor during idling using the OBD II scan tool or hand-held tester. OK: Heated oxygen sensor output voltage: Alternates between less than 0.4 V and more than 0.55 V (Scheme 424) OK: Go to step 17 NG: Go to next step
10. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition HTL (H3-1) - +B (H3-2) 11 to 16ohm (20°C) HTL2 (H4-1) -+B (H4-2) 11 to 16ohm (20°C) HT (H5-1) - +B (H5-2) 11 to 16ohm (20°C) HTR2 (H6-1) - +B (H6-2) 11 to 16ohm (20°C) NG: Replace heated oxygen sensor. OK: Go to next step
11. Check EFI relay. PREPARATION: Remove the EFI relay from the engine room J/B. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step
12. Check for open and short in harness and connector between ECM and heated oxygen sensor. PREPARATION: Disconnect the H3, H4, H5 or H6 heated oxygen sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition OX2 (H3-3) - OX1A (E6-23) Below 1 ohm HTL (H3-1) - HT1A (E6-4) Below 1 ohm OXL2 (H4-3) - 0X1 B (E6-29) Below 1 ohm HTL2 (H4-1) - HT1B (E6-5) Below 1 ohm OX (H5-3) - OX2A (E6-22) Below 1 ohm HT (H5-1) - HT2A (E6-33) Below 1 ohm OXR2 (H6-3) - OX2B (E6-21) Below 1 ohm HTR2 (H6-1) - HT2B (E6-25) Below 1 ohm OX2 (H3-3) or OX1A (E6-23) - Body ground 10 kohm or higher HTL (H3-1) or HT1A (E6-4) - Body ground 10 kohm or higher OXL2 (H4-3) or OX1B (E6-29) - Body ground 10 kohm or higher HTL2 (H4-1) or HT1B (E6-5) - Body ground 10 kohm or higher OX (H5-3) or OX2A (E6-22) - Body ground 10 kohm or higher HT (H5-1) or HT2A (E6-33) - Body ground 10 kohm or higher OXR2 (H6-3) or OX2B (E6-21) - Body ground 10 kohm or higher HTR2 (H6-1) or HT2B (E6-25) - Body ground 10 kohm or higher NG: Replace or replace harness or connector. OK: Go to next step
13. Replace heated oxygen sensor. Go
14. Perform confirmation driving pattern. Disconnect the battery terminal and wait for a minute (clear learning value of the air fuel ratio). (*1) Connect the hand-held tester to the DLC3. (*1) Switch the hand-held tester from the normal mode to the check mode (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). (*1) Start the engine and let it idle until engine coolant temperature is 75°C (167°F) or more. (*2) Drive the vehicle at 50 km/h (31 mph) or more for 3 minutes or more. (*3) Let the engine idle for approx. 2 minutes. (*4) Perform steps (e) and (g) at least 3 times. HINT: If a malfunction exists, the MIL will be illuminated during step (f). NOTE: If the conditions in this test are not strictly followed, detecting a malfunction may be difficult. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (e) to (f), and then do step (f) again. GO
15. Is there DTC P0171, P0172, P0174 or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ) and perform confirmation driving pattern (Refer to step 14 ). NO: Go to next step
16. Confirm if vehicle has run out of fuel in past. NO: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: DTC P0171, P0172, P0174 or P0175 is caused by running out of fuel.
17. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). Go
18. Is there DTC P0171, P0172 P0174 and/or P0175 being output again? NO: Go to step 14 YES: Go to next step
19. Replace heated oxygen sensor. Go
20. Perform confirmation driving pattern (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P0150 OXYGEN SENSOR CIRCUIT (BANK 2 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-181813-S32210917432005080400000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). Go
21. Is the DTC P0171, P0172, P0174 and/or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ) and perform confirmation driving pattern (Refer to step 14). No: Go to next step
22. Confirm if vehicle has run out of fuel in past. NO: Check for intermittent problems. (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). YES: DTC is caused by running out of fuel (DTCs P0171, P0172 P0174 and/or P0175).

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

When the STA signal and NE signal are input to the ECM, the Tr1 is turned ON, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and the fuel pump operates.

While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (circuit opening relay ON) and the fuel pump also keeps operating.

The fuel pump speed is controlled at two levels (high speed or low speed) by the condition of the engine (starting, light load, heavy load). When the engine starts (STA ON), the Tr2 in the ECM is OFF, so the fuel pump relay closes and battery positive voltage is applied directly to the fuel pump. The fuel pump operates at high speed.

After the engine starts during idling or light loads, since the Tr2 goes ON, power is supplied to the fuel pump via the fuel pump resistor. The fuel pump operates at low speed.

Scheme 432

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Scheme 435

HINT

This DTC chart is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table. See PROBLEM SYMPTOMS TABLE .

HINT

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

Scheme 436

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1. Check voltage between terminal FPR and E1 of ECM. CHECK: Measure the voltage between terminals of E7 and E5 ECM connectors. OK: TESTER CONNECTOR & SPECIFIC CONDITIONS Tester Connection Condition Specified Condition FPR (E7-33) - E1 (E5-1) STA signal ON 9 to 14V FPR (E7-33) - E1 (E5-1) STA signal OFF 0 to 3V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). NG: Go to next step
2. Check fuel pump relay. PREPARATION: Remove the fuel pump relay from the engine room R/B. CHECK: Inspect the fuel pump relay. OK: TESTER CONNECTION & SPECIFIC CONDITION Tester Connection Specified Condition 1 - 2 60 - 90 ohm 3 - 4 Less than 1 ohm 3 - 5 More than 10 kohm 3 - 5 Less than 1 ohm (Apply battery voltage terminal 1 and 2) NG: Replace fuel pump relay. OK: Go to next step
3. Check for open and short in harness and connector between fuel pump relay and ECM. PREPARATION: Remove the fuel pump relay from the engine room J/B. Disconnect the E7 ECM connector. CHECK: Measure the resistance between wire harness side connectors. OK: TESTER CONNECTION & SPECIFIC CONDITIONS Tester Connection Specified Condition Engine Room J/B (Fuel pump relay terminal 1) - FPR (E7-33) Below 1 ohm Engine Room J/B (Fuel pump relay terminal 1) or FPR(E7-33) -Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

When a misfire occurs in the engine, hydrocarbons (HC) enter the exhaust in high concentrations. If this HC concentration is high enough, there could be an increase in exhaust emissions levels. High concentrations of HC can also cause to 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 and could cause emissions deterioration, the ECM illuminates the MIL.

Scheme 440

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.

Scheme 441

Scheme 442

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

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

The ECM blinks the MIL (MIL blinks immediately) if

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

Scheme 443

Scheme 444

Scheme 445

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).
3. On 6 and 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (P0301 to P0308). If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area, only code P0300 may be stored. When only a general misfire fault code like P0300 is stored
4. Erase the general misfire fault code from the hand-held tester or OBD II scan tool.
5. Start the engine and drive the confirmation pattern.
6. Read the value of the misfire ratio for each cylinder. Or read the DTC.
7. Perform repairs on the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC.
8. After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs.
9. 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).
10. 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.
11. If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2) improper fuel is being used, and 3) the ignition plug is contaminated.
12. Be sure to check the value on the misfire counter after the repair.

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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 DTC using hand-held tester or the OBD II scan tool. RESULT: DTC OUTPUT DISPLAY 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 DTC. B: Go to relevant DTC chart (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). A: Go To Next Step
2. Check wire harness, connector and vacuum hose in engine room. CHECK: Check the connection conditions of the wire harness and connector. Check for the disconnection, piping and brake of the vacuum hose. NG: Repair or replace, then confirm that there is no misfire (See confirmation driving pattern). OK: Go To Next Step
3. Check connection of PCV piping. NG: Repair or replace PCV piping. OK: Go To Next Step
4. Connect hand-held tester, and read the number of misfire. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Start the engine. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL#1 to CYL#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: 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 15 . A: Go To Next Step
5. Check spark plug and spark of misfiring cylinder. PREPARATION: Remove the ignition coil assembly. Remove the spark plug. CHECK: Check the electrode for carbon deposits. Check the spark plug type. Check electrode gap. OK: No large carbon deposit present and not wet with gasoline or oil. Recommended spark plug: RECOMMENDED SPARK PLUG DENSO made K20R-U NGK made BKR6EYA Electrode gap: 1.1 mm (0.039 in.) NOTE: If adjusting the gap of a new spark plug, bend only "the base / ground" electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug. PREPARATION: Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground spark plug. CHECK: Check if spark occurs while engine is being cracked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark occurs across electrode gap. OK: Go to step 8 . NG: Go To Next Step
6. Change normal spark plug and check spark of misfiring cylinder. PREPARATION: Change to the normal spark plug. Remove the spark plug that may be faulty from the ignition coil assembly. Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark jumps across electrode gap. OK: Replace spark plug. NG: Replace the ignition coil of misfiring cylinder.
7. Check for open or short in harness and connector between ignition coil and ECM. NG: Repair or replace harness and connector. OK: Replace ignition coil.
8. Check ECM terminal of misfiring cylinder. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between the terminals of the E5, E6 and E7 ECM connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition #1 (E7-1) - E01 (E7-7) 9 to 14 V #2 (E7-2) - E01 (E7-7) 9 to 14 V #3 (E7-3) - E01 (E7-7) 9 to 14 V #4 (E7-4) - E01 (E7-7) 9 to 14 V #5 (E7-5) - E01 (E7-7) 9 to 14 V #6 (E6-3) - E01 (E7-7) 9 to 14 V #7 (E5-6) - E01 (E7-7) 9 to 14 V #8 (E5-5) - E01 (E7-7) 9 to 14 V OK: Go to step 11 . NG: Go To Next Step
9. Check injector resistance of misfiring cylinder (See «INSPECTION»(ref-181796-S03621786812006080100000) ). NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000) ). OK: Go To Next Step
10. Check for open and short in harness and connector between ignition SW and injector, injector and ECM of misfiring cylinder. Check the harness and the connector between the injector connector and the ECM connector: PREPARATION: Disconnect the I14, I15, I16, I17, I18, I19, I20 or I21 injector connector. Disconnect the E5, E6 or E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Injector (I14-2) - #1 (E7-1) Below 1 ohm Injector (I15-2) - #2 (E7-2) Below 1 ohm Injector (I16-2) - #3 (E7-3) Below 1 ohm Injector (I17-2) - #4 (E7-4) Below 1 ohm Injector (I18-2) - #5 (E7-5) Below 1 ohm Injector (I19-2) - #6 (E6-3) Below 1 ohm Injector (I20-2) - #7 (E5-6) Below 1 ohm Injector (I21-2) - #8 (E5-5) Below 1 ohm Injector (I14-2) or #1 (E7-1) - Body ground 10 kohm or higher Injector (I15-2) or #2 (E7-2) - Body ground 10 kohm or higher Injector (I16-2) or #3 (E7-3) - Body ground 10 kohm or higher Injector (I17-2) or #4 (E7-4) - Body ground 10 kohm or higher Injector (I18-2) or #5 (E7-5) - Body ground 10 kohm or higher Injector (I19-2) or #6 (E6-3) - Body ground 10 kohm or higher Injector (I20-2) or #7 (E5-6) - Body ground 10 kohm or higher Injector (I21-2) or #8 (E5-5) - Body ground 10 kohm or higher Check the harness and connector between the injector connector and the ignition switch: PREPARATION: Disconnect the I14, I15, I16, I17, I18, I19, I20 or I21 injector connector. Disconnect the I23 ignition switch connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Injector (I14-1) - IG2 (I23-6) Below 1 ohm Injector (I15-1) - IG2 (I23-6) Below 1 ohm Injector (I16-1) - IG2 (I23-6) Below 1 ohm Injector (I17-1) - IG2 (I23-6) Below 1 ohm Injector (I18-1) - IG2 (I23-6) Below 1 ohm Injector (I19-1) - IG2 (I23-6) Below 1 ohm Injector (I20-1) - IG2 (I23-6) Below 1 ohm Injector (I21-1) - IG2 (I23-6) Below 1 ohm Injector (I14-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I15-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I16-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I17-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I18-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I19-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I20-1) or IG2 (I23-6) - Body ground 10 kohm or higher Injector (I21-1) or IG2 (I23-6) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go To Next Step
11. Check injector resistance of misfiring cylinder (See «INSPECTION»(ref-181796-S03621786812006080100000) ). NG: Replace injector (See «INSTALLATION»(ref-181796-S29374995092006080100000) ). OK: Go To Next Step
12. Check compression pressure of misfiring cylinder. NG: Repair or replace. OK: Go To Next Step
13. Check valve clearance of misfiring cylinder (See «VALVE CLEARANCE (2UZ-FE)»(ref-182828) ). NG: Adjust valve clearance. OK: Go To Next Step
14. Check result of step 4 switch step by number of misfire cylinder. CHECK RESULT OF STEP 4 SWITCH 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-181813-S00378289582005080400000) ). A: Go To Next Step
15. Check valve timing (Check for looseness or a jumped tooth of timing belt) (See «TIMING BELT (2UZ-FE)»(ref-182831) ). NG: Adjust valve timing (Repair or replace timing belt). OK: Go To Next Step
16. Check fuel pressure (See «FUEL PUMP»(ref-181796-S34939073812006080100000) ). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181796-S31943288342005080400000) ). 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 menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read its value displayed on the hand-held tester or the OBD II scan tool. OK: Equivalent to ambient temperature CHECK: Check the air flow rate. When using hand-held tester, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF. Read its value displayed on the hand-held tester or the OBD II scan tool. OK: AIR FLOW RATE Condition Air Flow Rate (gm/s) Ignition switch ON (do not start engine) 0 Idling 4 to 6 Running without load (2,500 rpm) 13 to 20 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: 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 (warm up or allow to cool down) and repeat the test. NG: Replace engine coolant temperature OK: Go To Next Step
19. Switch step by number of misfire cylinder (Refer 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-181813-S00378289582005080400000) ).

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 455

HINT

1. Bank 1 refers to the bank that includes cylinder No. 1.
2. Bank 2 refers to the bank that does not include cylinder No. 1.

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

HINT

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

Scheme 456

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

Scheme 457

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 EC2 connector. Connect the terminals of the male and female connectors as shown in the illustration. Turn ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. After the engine warm-up, race the engine at 4,000 RPM 3 times. CHECK: Check the DTC. RESULT: CONNECTING TERMINALS OF MALE & FEMALE CONNECTORS Condition Go To DTC same as when vehicle brought in P0325 --> P0325 or P0330 --> P0330 A DTC different to when vehicle brought in P0325 --> P0330 or P0330 --> P0325 B B: Go to step 3 . A: 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-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).
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-181807-S35860315572005080400000) ). HINT: If DTC P0325 has changed to P0330, check the knock sensor circuit on the bank 1. If DTC P0330 has changed to P0325, check the knock sensor circuit on the bank 2. NG: Repair or replace harness or connector. OK: Replace knock sensor.

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

Scheme 458

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 459

Scheme 460

*:DOUBLE CAB

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 OF HAND-HELD TESTER OR OBD II SCAN TOOL Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON. When using hand-held tester, enter the following menus: "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD".
3. The engine speed can be confirmed in DATA LIST using the hand-held tester or OBD II scan tool. If there is no NE signals from the crankshaft position sensor despite the engine 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 461

Scheme 462

Scheme 463

Scheme 464

1. Check resistance of crankshaft position sensor. PREPARATION: Disconnect the C2 crankshaft 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 form -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. PREPARATION: Disconnect the C2 crankshaft position sensor connector. Disconnect the E5 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Crankshaft position sensor (C2-1) - NE+ (E5-25) Below 1 ohm Crankshaft position sensor (C2-2) - NE- (E5-24) Below 1 ohm Crankshaft position sensor (C2-1) or NE+ (E5-25) - Body ground 10 kohm or higher Crankshaft position sensor (C2-2) or NE- (E5-24) - Body ground 10 kohm or higher 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 (2UZ-FE)»(ref-182831) ). CHECK: Check the teeth of sensor plate. NG: Replace sensor plate. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

The camshaft position sensor (G signal) consists of a magnet iron core and 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 G2 based on the combination of the G and NE signals.

Scheme 465

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 466

Scheme 467

*: DOUBLE CAB

HINT

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

Scheme 468

Scheme 469

Scheme 470

Scheme 471

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 form 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-181807-S35860315572005080400000) ). PREPARATION: Disconnect the C1 camshaft position sensor connector. Disconnect the E5 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition Camshaft position sensor (C1-1) - G2, G2+* (E5-27) Below 1 ohm Camshaft position sensor (C1-2) - G2- (E5-32) Below 1 ohm Camshaft position sensor (C1-1) or G2, G2+* (E5-27) - Body ground 10 kohm or higher Camshaft position sensor (C1-2) or G2- (E5-32) - Body ground 10 kohm or higher *: DOUBLE CAB 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 (2UZ-FE)»(ref-182831) ). CHECK: Check the LH camshaft timing belt pulley. NG: Replace LH camshaft timing pulley. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

HINT

1. If DTCs P0351, P0354, P0356 and P0357 are output simultaneously, IGF1 circuit may be open or short.
2. If DTCs P0352, P0353, P0355 and P0358 are output simultaneously, IGF2 circuit may be open or short.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 472

Scheme 473

Scheme 474

Scheme 475

Scheme 476

Scheme 477

Scheme 478

Scheme 479

Scheme 480

Scheme 481

Scheme 482

Scheme 483

Scheme 484

Scheme 485

1. Check spark plug and spark (See «IGNITION (2UZ-FE) SPECIFICATIONS»(ref-181941) ). NG: Go to step 4 . OK: Go To Next Step
2. Check for open and short in harness and connector in IGF signal circuits between ECM and ignition coil with igniter. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil will igniter connector. Disconnect the E7 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Ignition coil (I3-2) - IGF1 (E7-24) Below 1 ohm Ignition coil (I4-2) - IGF2 (E7-23) Below 1 ohm Ignition coil (I5-2) - IGF1 (E7-24) Below 1 ohm Ignition coil (I6-2) - IGF2 (E7-23) Below 1 ohm Ignition coil (I7-2) - IGF1 (E7-24) Below 1 ohm Ignition coil (I8-2) - IGF2 (E7-23) Below 1 ohm Ignition coil (I9-2) - IGF1 (E7-24) Below 1 ohm Ignition coil (I10-2) - IGF2 (E7-23) Below 1 ohm Ignition coil (I3-2) or IGF1 (E7-24) - Body ground 10 kohm or higher Ignition coil (I4-2) or IGF2 (E7-23) - Body ground 10 kohm or higher Ignition coil (I5-2) or IGF1 (E7-24) - Body ground 10 kohm or higher Ignition coil (I6-2) or IGF2 (E7-23) - Body ground 10 kohm or higher Ignition coil (I7-2) or IGF1 (E7-24) - Body ground 10 kohm or higher Ignition coil (I8-2) or IGF2 (E7-23) - Body ground 10 kohm or higher Ignition coil (I9-2) or IGF1 (E7-24) - Body ground 10 kohm or higher Ignition coil (I10-2) or IGF2 (E7-23) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go To Next Step
3. Disconnect ignition coil with igniter connector, and check voltage between terminals IGF1, IGF2 and E1 of ECM connector. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil with igniter connector. Turn the ignition switch ON. CHECK: Measure the voltage between the E7 and E5 ECM connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition IGF1 (E7-24) - E1 (E5-1) 4.5 to 5.5 V IGF2 (E7-23) - E1 (E5-1) 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Replace ignition coil with igniter.
4. Check for open and short in harness and connector in IGT signal circuits between ECM and ignition coil with igniter. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil will igniter connector. Disconnect the E7 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Ignition coil (I3-3) - IGT1 (E7-9) Below 1 ohm Ignition coil (I4-3) - IGT2 (E7-8) Below 1 ohm Ignition coil (I5-3) - IGT3 (E7-25) Below 1 ohm Ignition coil (I6-3) - IGT4 (E7-11) Below 1 ohm Ignition coil (I7-3) - IGT5 (E7-12) Below 1 ohm Ignition coil (I8-3) - IGT6 (E7-26) Below 1 ohm Ignition coil (I9-3) - IGT7 (E7-13) Below 1 ohm Ignition coil (I10-3) - IGT8 (E7-10) Below 1 ohm Ignition coil (I3-3) or IGT1 (E7-9) - Body ground 10 kohm or higher Ignition coil (I4-3) or IGT2 (E7-8) - Body ground 10 kohm or higher Ignition coil (I5-3) or IGT3 (E7-25) - Body ground 10 kohm or higher Ignition coil (I6-3) or IGT4 (E7-11) - Body ground 10 kohm or higher Ignition coil (I7-3) or IGT5 (E7-12) - Body ground 10 kohm or higher Ignition coil (I8-3) or IGT6 (E7-26) - Body ground 10 kohm or higher Ignition coil (I9-3) or IGT7 (E7-13) - Body ground 10 kohm or higher Ignition coil (I10-3) or IGT8 (E7-10) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Go To Next Step
5. Check voltage between terminals IGT1 - IGT8 and E1 of ECM connector. CHECK: Measure the voltage between terminals the E5 and E7 ECM connectors when the engine is cranked. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
6. Disconnect ignition coil with igniter connector, and check voltage between terminals IGT1 - IGT8 and E1 of ECM connector. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil with igniter connector. CHECK: Measure the voltage between terminals the E5 and E7 ECM connectors when the engine is cranked. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
7. Check ignition coil with igniter power source circuit. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil with igniter connector. CHECK: Measure the voltage between the terminal of the wire harness side connector and body ground. OK: OK: Replace 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. PREPARATION: Disconnect the I3, I4, I5, I6, I7, I8, I9 or I10 ignition coil with igniter connector. Disconnect the I23 ignition switch connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Ignition coil (I3-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I4-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I5-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I6-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I7-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I8-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I9-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I10-1) - IG2 (I23-6) Below 1 ohm Ignition coil (I3-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I4-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I5-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I6-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I7-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I8-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I9-1) or IG2 (I23-6) - Body ground 10 kohm or higher Ignition coil (I10-1) or IG2 (I23-6) - Body ground 10 kohm or higher 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, and other data from the time the malfunction occurred.

Scheme 486

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 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 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-181813-S15771513212005080400000) ). 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-181796-S33996762002006080100000) ). NG: Replace heated oxygen sensor. OK: Go To Next Step
4. Check heated oxygen sensor (bank 1, 2 sensor 2) (See «HEATED OXYGEN SENSOR»(ref-181796-S33996762002006080100000) ). HINT: Refer to the hint following the end of this flowchart. NG: Replace heated oxygen sensor. OK: Replace front and rear three-way catalytic converter in the bank a malfunction is detected. HINT: The 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). "A/F CONTROL" is the ACTIVE TEST which changes the injection volume to -12.5 % or +25 %. A/F control procedure: 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 item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL". Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button). Standard: Heated oxygen sensor reacts in accordance with increase and decrease of injection volume +25 % --> rich output: More than 0.5 V -12.5 % --> lean output: Less than 0.4 V NOTE: However, there is a few second delay in the sensor 1 (front sensor) output. And there is about 20 seconds delay in the sensor 2 (rear sensor). 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 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. A high heated oxygen sensor (sensor 1) voltage (0.55 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.

HINT

1. When using the hand-held tester, follow the procedures under the title "Hand-held tester" (see next page).
2. When using the OBD II scan tool, follow the procedures under the title "OBD II scan tool (excluding hand-held tester)" (see the procedures after the "Hand-held tester" procedures).
3. Always troubleshoot DTCs P0441 (purge flow), P0446 (CCV), P0451, P0452 and P0453 (evaporative pressure sensor) before troubleshooting DTC P0442 or P0456.
4. Ask the customer if the following situations occurred. When the MIL illuminated, if the fuel tank cap was loose and if it was then tightened. When refueling, if the fuel tank cap was loose. If the fuel tank cap was loose, that is the why the DTC was stored. If the fuel cap was not loose or if the customer cannot remember, troubleshoot according to the procedures on the following page.
5. 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.
6. If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

DTC OUTPUT TROUBLE CHART

HINT

Use the chart above to check the malfunction for each DTC output. The perform the necessary repairs listed under "Trouble Chart".

Scheme 487

Scheme 488

Scheme 489

Scheme 490

Scheme 491

Scheme 492

Scheme 493

Scheme 494

1. Read output DTC. PREPARATION: Connect the hand-held tester to the DLC3. CHECK: Read the output DTC. Troubleshoot the problems, according to the DTC output. B: Go to step 6 C: Go to step 10 A: Go To Next Step
2. Check that fuel tank cap meets specification in original equipment manufacturing (OEM). NG: Replace fuel tank cap OK: Go To Next Step
3. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go To Next Step
4. Check fuel tank cap (See «INSPECTION»(ref-181794-S09280552692006083000000) ). NG: Replace fuel tank cap. OK: Go To Next Step
5. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace fuel tank inlet pipe. OK: Go To Next Step
6. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the VSV for the EVAP from the canister. Start the engine. Select the item "EVAP (ALON)/ALL" in the ACTIVE TEST and operate EVAP VSV. CHECK: When the VSV for the EVAP 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 10 . NG: Go To Next Step
7. Check vacuum hose between intake manifold, EVAP VSV and canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole, damage and blockage. NG: Repair or replace. OK: Go To Next Step
8. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-181796-S40433818592006080100000) ). NG: Replace EVAP VSV. OK: Go To Next Step
9. Check wire harness and connector between EFI main relay, EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).
10. Check CCV. PREPARATION: Disconnect the vacuum hose for the VSV for the CCV from the canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Select the item "INTAKE CTL VSV/ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. B: Go to step 13 . C: Go to step 15 . A: Go To Next Step
11. Check operation of CCV PREPARATION: Disconnect the CCV connector. Apply the battery voltage to the CCV. CHECK: Check that air cannot flow freely. OK: When battery voltage is applied to the CCV, air cannot flow freely. NG: Replace CCV. OK: Go To Next Step
12. Check for open and short in harness and connector between EFI main relay, CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go To Next Step
13. Check leakage for between CCV and canister. CHECK: Check that the CCV is correctly installed. Check the O-ring. NG: Repair or replace. OK: Go To Next Step
14. Perform active test for EVAP VSV (Check that canister filter is not clogged). PREPARATION: Disconnect the vacuum hose for the VSV for the CCV from the canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Select the item "INTAKE CTL VSV/ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from canister filter port to port F. VSV is OFF: Air from canister filter port flows out through port F. NG: Replace canister filter. OK: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).
15. Check whether hose close to fuel tank have been modified, and check whether there are signs of any accident near fuel tank or canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank canister Fuel tank filler pipe Hoses and tubes around fuel tank and canister NG: Repair or replace. OK: Go To Next Step
16. Check vacuum hoses between intake manifold, EVAP VSV and canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG: Repair or replace. OK: Go To Next Step
17. Check hose between canister and fuel tank. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe (see «INSPECTION»(ref-181794-S09280552692006083000000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace. OK: Go To Next Step
18. Check canister for cracks, hole and damage (See «INSPECTION»(ref-181794-S09280552692006083000000) ). NG: Replace canister. OK: Go To Next Step
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the grove compartment (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 - 5.5 V NG: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go To Next Step
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the grove compartment (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors. Disconnect the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Voltage: 2.9 - 3.7 V Voltage: 0.5 V or less OK: Go to step 22 . NG: Go To Next Step
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.
22. Check fuel tank for cracks and damage. NG: Replace fuel tank OK: It is likely that vehicle user did not properly close fuel tank cap. Please explain to customer how to properly install fuel tank cap.

HINT

1. If different DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. If DTC P0441 (EVAP VSV), P0446 (CCV), P0451, P0452 or P0453 (Vapor Pressure Sensor) is output with DTC P0442, P0455 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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 495

Scheme 496

Scheme 497

Scheme 498

1. Check voltage between terminals VC and E2 of ECM connector. CHECK: Turn the ignition switch ON. CHECK: Measure the voltage between terminals the E7 ECM connector. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition VC (E7-18) - E2 (E7-28) 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go To Next Step
2. Check voltage between terminals PTNK and E2 of ECM connectors (See «DTC P0441 EVAPORATIVE EMISSION CONTROL SYSTEM INCORRECT PURGE FLOW, DTC P0442 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), DTC P0446 EVAPORATIVE EMISSION CONTROL SYSTEM VENT CONTROL CIRCUIT, DTC P0455 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (GROSS LEAK), DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (VERY SMALL LEAK)»(ref-181813-S25266186692005080400000) ). PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. Check the vapor pressure sensor output waveform using a hand-held tester. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Voltage: 2.9 to 3.7 V Voltage: 0.5 V or less A consecutive waveform presents. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). 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-181807-S35860315572005080400000) ). PREPARATION: Disconnect the V1 vapor pressure sensor connector. Disconnect the E7 and E3 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition GND (V1-1) - E2 (E7-28) Below 1ohm PTNK (V1-2) - PTNK (E3-21) Below 1ohm VCC (V1-3) - VC (E7-18) Below 1ohm PTNK (V1-2) or PTNK (E3-21) - Body ground 10 kohm or higher VCC (V1-3) or VC (E7-18) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.

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

Scheme 499

Scheme 500

In addition to turning on the stop lamps, the stop lamp 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 STI-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.

HINT

Normal condition is as shown in the table.

BRAKE PEDAL NORMAL CONDITION

Scheme 501

Scheme 502

Scheme 503

Scheme 504

Scheme 505

1. Check operation of stop light. CHECK: Check if the stop lights go on and 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 cowl instrument panel J/B. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG: Check for short in all harness and components connected to STOP fuse. OK: Go To Next Step
3. Check stop light switch (See «STOP LIGHT SYSTEM»(ref-182154) ). NG: Replace stop light switch. OK: Go To Next Step
4. Check STP signal and STI- voltage. PREPARATION: Turn the ignition switch ON. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW". CHECK: Read the signal displayed on the hand-held tester. OK: BRAKE PEDAL SPECIFIED CONDITION Brake Pedal Specified Condition Depressed STP Signal ON Released STP Signal OFF CHECK: Measure the voltage between the specified terminals of the E4 and E5 ECM connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Brake Pedal Specified Condition STI- (E4-12) - E1 (E5-1) Depressed Below 1.5 V Released 7.5 to 14 V OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). NG: Go To Next Step
5. Check harness and connector between ECM and stop light switch. PREPARATION: Disconnect the S4 stop light switch connector. Disconnect the E4 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition Stop light switch (S4-1) - STP (E4-19) Below 1 ohm Stop light switch (S4-3, S4-2 (1) ) - ST1-(E4-12) Below 1 ohm Stop light switch (S4-1) or STP (E4-19) - Body ground 10 kohm or higher Stop light switch (S4-3, S4-2 (1) ) or ST1- (E4-12) - Body ground 10 kohm or higher (1) DOUBLE CAB NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

HINT

1. When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc., DTC P0505 will possibly be detected.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the 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 DISPLAY 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-181813-S15771513212005080400000) ). 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 «PRECAUTION»(ref-181796-S31943288342005080400000) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace air induction system. OK: Check electric throttle control system (See «THROTTLE BODY»(ref-181796-S13923946182006080100000) ).

1. Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

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

1. Connect hand-held tester, and check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON, and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: STA SIGNAL DISPLAY Ignition Switch Position ON START STA Signal OFF ON OK: Go to step 4 . NG: Go To Next Step
2. Check park/neutral position switch (See «DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850*: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181814-S27776926872005080400000) ). NG: Replace park/neutral position switch and proceed to step 4. OK: Go To Next Step
3. Check ignition switch (See «IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch and proceed to step 4. OK: Repair or replace harness and connector and proceed to step 4.
4. Check DTC reoccur. PREPARATION: Connect the hand-held tester. Clear DTC on the hand-held tester. Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check the DTC. RESULT: DTC OUTPUT DISPLAY Display (DTC Output) Proceed to No DTC output A P0617 B B: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 506

1. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the glove compartment door (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). 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 START position) and while not engine cranking the engine (ignition switch position ON). OK: Voltage: 6 V or more (ignition switch START position) 0 V (ignition switch ON position) OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ) NG: Go To Next Step
2. Check park/neutral position switch (See «DTC P0705: TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT); DTC P0850*: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181814-S27776926872005080400000) ). OK: Go To Next Step
3. Check ignition switch (See «IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch and proceed to step 4. OK: Repair or replace harness and connector and proceed to step 4.
4. Check DTC reoccur. PREPARATION: Connect the OBD II scan tool. Clear DTC. Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check the DTC. RESULT: DTC OUTPUT DISPLAY Display (DTC Output) Proceed to No DTC output A P0617 B B: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ) A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

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

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

HINT

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

Scheme 507

The throttle motor is operated by the ECM and it opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor, which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM to control the throttle 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 508

HINT

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

1. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check whether or not a foreign body is caught between the throttle valve and housing. Also, check if the valve can open and close smoothly. NG: Replace throttle body (See «REPLACEMENT»(ref-181796-S24491942472006080100000) ). OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ).

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 to OFF. The ECM then allows current to flow to the motor and the motor can be restarted.

HINT

This ETCS does not use a throttle cable.

Scheme 509

Scheme 510

HINT

Read freeze frame data using hand-held tester or OBD II scan tool, as 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 511

1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse from the engine room 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 and E1 of ECM connector. CHECK: Measure the voltage between the specified terminals of the E4 and E5 ECM connector. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition +BM (E4-6) - E6 (E5-1) 9 to 14 V OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ). NG: Go To Next Step
3. Check wire harness or connector between battery, ETCS fuse and ECM. NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

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 512

HINT

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

1. Are there any other codes (besides DTC P2119) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn 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 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-181813-S15771513212005080400000) ). A: Go To Next Step
2. Replace ECM and clear DTC (Check if DTC outputs reoccur). PREPARATION: Replace ECM. Clear the DTC (see «PRE-CHECK»(ref-181813-S00378289582005080400000) ). Start and warm up the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool (see «PRE-CHECK»(ref-181813-S00378289582005080400000) ). OK: No DTC output. OK: System is normal. NG: Replace throttle body (See «REPLACEMENT»(ref-181796-S24491942472006080100000) ).

HINT

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

Scheme 513

Scheme 514

Scheme 515

Scheme 516

1. Connect hand-held tester, and read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2. CHECK: Read the voltage for the APP sensor data. OK: ACCELERATOR PEDAL VOLTAGE Accelerator pedal ACCEL POS #1 ACCEL POS #2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 5.3 V OK: Go to step 5 . NG: Go To Next Step
2. Check wire harness or connector between ECM and accelerator pedal position sensor. PREPARATION: Disconnect the A20 APP sensor connector. Disconnect the E3 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition VPA (A20-6) - VPA (E3-22) Below 1 ohm EPA (A20-5) - EPA (E3-28) Below 1 ohm VCPA (A20-4) - VCPA (E3-26) Below 1 ohm VPA2 (A20-3) - VPA2 (E3-23) Below 1 ohm EPA2 (A20-2) - EPA2 (E3-29) Below 1 ohm VCP2 (A20-1) - VCP2 (E3-27) Below 1 ohm VPA (A20-6) or VPA (E3-22) - Body ground 10 kohm or higher EPA (A20-5) or EPA (E3-28) - Body ground 10 kohm or higher VCPA (A20-4) or VCPA (E3-26) - Body ground 10 kohm or higher VPA2 (A20-3) or VPA2 (E3-23) - Body ground 10 kohm or higher EPA2 (A20-2) or EPA2 (E3-29) - Body ground 10 kohm or higher VCP2 (A20-1) or VCP2 (E3-27) - Body ground 10 kohm or higher NG: Repair or replace harness and connector. OK: Go To Next Step
3. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM terminals. PREPARATION: Turn the ignition switch ON. Disconnect the A20 APP sensor connector. CHECK: Measure the voltage between the specified terminals of the E3 ECM connector. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition VCPA (E3-26) - EPA (E3-28) 4.5 to 5.5 V VCP2 (E3-23) - EPA2 (E3-29) 4.5 to 5.5 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
4. Replace accelerator pedal assembly (See «ACCELERATOR PEDAL POSITION SENSOR»(ref-181796-S20446622902006080100000) ). Go
5. Check if DTC output recur? PREPARATION: Connect the hand-held tester to the DLC3. Disconnect the battery terminals or remove the EFI NO. 1 fuse and ETCS fuse (Clear DTCs). Start the engine. Drive the engine at idle for 15 seconds or more. CHECK: Read the DTC output. OK: No DTC output. OK: System is OK. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ).

HINT

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

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1. Connect hand-held tester, and read the voltage for accelerator pedal position sensor data. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: ACCELERATOR PEDAL VOLTAGE Accelerator pedal ACCEL POS #1 ACCEL POS #2 Released 0.5 to 1.1 V 1.2 to 2.0 V Depressed 2.6 to 4.5 V 3.4 to 5.3 V OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). NG: Go To Next Step
2. Check wire harness or connector between ECM and accelerator pedal position sensor. PREPARATION: Disconnect the A20 accelerator pedal position (APP) sensor connector. Disconnect the E3 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Specified Condition VPA (A20-6) - VPA (E3-22) Below 1 ohm EPA (A20-5) - EPA (E3-28) Below 1 ohm VCPA (A20-4) - VCPA (E3-26) Below 1 ohm VPA2 (A20-3) - VPA2 (E3-23) Below 1 ohm EPA2 (A20-2) - EPA2 (E3-29) Below 1 ohm VCP2 (A20-1) - VCP2 (E3-27) Below 1 ohm VPA (A20-6) or VPA (E3-22) - Body ground 10 kohm or higher EPA (A20-5) or EPA (E3-28) - Body ground 10 kohm or higher VCPA (A20-4) or VCPA (E3-26) - Body ground 10 kohm or higher VPA2 (A20-3) or VPA2 (E3-23) - Body ground 10 kohm or higher EPA2 (A20-2) or EPA2 (E3-29) - Body ground 10 kohm or higher VCP2 (A20-1) or VCP2 (E3-27) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Replace accelerator pedal assembly.

When the ignition switch is turned ON, battery positive voltage is applied to terminal IGSW of the ECM and the EFI main relay (Marking: EFI) control circuit in the ECM sends a signal to terminal MREL of the ECM switching on the EFI main relay.

This signal causes current to flow to the coil, closing the contacts of the EFI main relay and supplying power to terminals +B of the ECM.

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

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1. Check voltage between terminals +B and E1 of ECM connectors. PREPARATION: Remove the glove compartment (see «INSPECTION»(ref-181796-S30062878212006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals +B and E1 of the ECM connectors. OK: Voltage: 9 - 14 V OK: Proceed to next circuit inspection shown on Problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-181813-S31416712262005080400000) ). 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-181807-S35860315572005080400000) ). 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 glove compartment (see «INSPECTION»(ref-181796-S30062878212006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGSW of the ECM and the body ground. OK: Voltage: 9 - 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 & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM.
6. Check voltage between terminal MREL of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «INSPECTION»(ref-181796-S30062878212006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal MREL of the ECM connector and the body ground. OK: Voltage: 9 - 14 V NG: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
7. Check EFI NO.1 fuse (See «DTC P0560 SYSTEM VOLTAGE»(ref-181813-S13320787682005080400000) ). NG: Check for short in all harness and components connected to EFI NO.1 fuse. OK: Go To Next Step
8. Check EFI main relay (Marking: EFI) (See «EFI MAIN RELAY»(ref-181796-S18000069342006080100000) ). NG: Replace EFI main relay. OK: Go To Next Step
9. Check for open and short in harness and connector between terminal MREL of ECM and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair and replace harness or connector. OK: Check and repair harness or connector between EFI NO.1 fuse and battery.

The starter is controlled by the ECM, when the ECM detects a start signal (STSW) from the ignition switch, this system monitors the engine RPM and continues to operate the starter unit it has determined that the engine has started (the engine RPM reaches approximately 500 RPM). If the engine is already running and the ignition switch is turned to start, the ECM will not operate the starter.

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Hand-held tester

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1. Check operation of engine cranking. CHECK: When turning the ignition switch to the ST position, check whether the starter motor starts. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ) NG: Go To Next Step
2. Connect hand-held tester, and 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. 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: Go to step 7 . OK: Go To Next Step
3. Check voltage between terminal STAR of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal STAR of the ECM connector and the body ground, while cranking the engine (ignition switch START position) and while not engine cranking the engine (ignition switch position ON). OK: Voltage: 9 - 14 V NG: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
4. Check park/neutral position switch. PREPARATION: Remove the park/neutral position switch connector. CHECK: Check continuity between each terminal shown below when the shift lever is moved to each range. OK: There is continuity. NG: Replace the park/neutral position switch. OK: Go To Next Step
5. Check starter relay (Marking: ST) (See «STARTERS»(ref-163557) ). NG: Replace starter relay. OK: Go To Next Step
6. Check for open and short in harness and connector between ECM and park/neutral position switch, park/neutral position switch and starter relay, starter relay and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ).
7. Check STA fuse. PREPARATION: Remove the STA (ST*) fuse from the driver side J/B (engine room J/B*). CHECK: Check continuity of STA (ST*) fuse. OK: Continuity *: DOUBLE CAB NG: Check for short in all the harness and components connected to STA fuse (See attached wiring diagram.). OK: Go To Next Step
8. Check ignition switch. PREPARATION: Remove the lower finish panel. Disconnect the ignition switch connector. CHECK: Check continuity between terminals shown below. OK: NG: Replace ignition switch OK: Go To Next Step
9. Check for open in harness and connector between terminal STSW of ECM connector and STA fuse, ignition switch and STA fuse (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check operation of engine cranking. CHECK: When turning the ignition switch to the ST position, check whether the starter motor starts. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ) NG: Go To Next Step
2. Check voltage between terminal STSW of ECM connector and body ground. PREPARATION: Remove the glove compartment door (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). 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 START position) and while not engine cranking the engine (ignition switch position ON). OK: Voltage: 6 V or more NG: Go to step 8 . OK: Go To Next Step
3. Check voltage between terminal STAR of ECM connector and body ground. PREPARATION: Remove the glove compartment (see «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal STAR of the ECM connector and the body ground, while cranking the engine (ignition switch START position) and while not engine cranking the engine (ignition switch position ON). OK: Voltage: 9 - 14 V NG: Check and replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-181796-S23719593312006080100000) ). OK: Go To Next Step
4. Check park/neutral position switch. PREPARATION: Remove the park/neutral position switch connector. CHECK: Check continuity between each terminal shown below when the shift lever is moved to each range. OK: There is continuity. NG: Replace the park/neutral position switch. OK: Go To Next Step
5. Check starter relay (Marking: ST) (See «STARTERS»(ref-163557) ). NG: Replace starter relay. OK: Go To Next Step
6. Check for open and short in harness and connector between ECM and park/neutral position switch, park/neutral position switch and starter relay, starter relay and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ).
7. Check STA fuse. PREPARATION: Remove the STA (ST*) fuse from the driver side J/B (engine room J/B*). CHECK: Check continuity of STA (ST*) fuse. OK: Continuity *: DOUBLE CAB NG: Check for short in all the harness and components connected to STA fuse (See attached wiring diagram.). OK: Go To Next Step
8. Check ignition switch. PREPARATION: Remove the lower finish panel. Disconnect the ignition switch connector. CHECK: Check continuity between terminals shown below. OK: NG: Replace ignition switch. OK: Go To Next Step
9. Check for open in harness and connector between terminal STSW of ECM connector and STA fuse, ignition switch and STA fuse (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181813-S00378289582005080400000) ).