Engine Control System - Diagnosis: Diagnosis Lexus LX J100 рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the procedure on the following page.

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1. DIAGNOSIS SYSTEM Description When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand- held tester. Various data output from the vehicle's ECM can then be read. OBD II regulations require that the vehicle's on board 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-209750-S20472950682005121100000) ). 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 «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ). The diagnosis system operates in "normal mode" during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate deletion 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. HINT: Connect the cable of the hand-held tester to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side. If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual. Inspect the battery voltage. Battery Voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the MIL. The MIL comes on when the ignition switch is turned ON and the engine is not running. HINT: If the MIL is not illuminated, troubleshoot the MIL circuit (See «MIL CIRCUIT»(ref-209750-S06139735812005121100000) ). 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 CODED. For the OBD II scan tool, see its instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) 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 comes on and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. 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 or ECD 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: the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF. Start the engine. The MIL should turn off after the engine starts. Simulate the conditions of the malfunction described by the customer. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data. After checking the DTC, inspect the applicable circuit. Clearing DTCs using the OBD II scan tool or the hand-held tester. Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch ON. Erase DTCs and freeze frame data with the OBD II scan tool (complying with SAE J1978) or the hand-held tester. For the hand-held tester: 1) enter the following menus: DIAGNOSIS ENHANCED OBD II / DTC INFO / CLEAR CODES; and 2) press YES. For the OBD II scan tool, see its instruction manual. Clearing the DTCs without using the OBD II scan tool or the hand-held tester. Remove the EFI or ECD 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.
4. FAIL-SAFE CHART If any of the following code is recorded, the ECM enters fail-safe mode.
5. CHECK FOR INTERMITTENT PROBLEMS Hand-held tester only: Inspect the vehicle's ECM using check mode. Intermittent problems are easier to detect when the ECM is in check mode with hand-held tester. In check mode, the ECM uses 1 trip detection logic, which has a higher sensitivity to malfunctions than normal mode (default), which uses 2 trip detection logic. Clear the DTCs. (See step 2 ) Set the check mode. (See step 3 ) Perform a simulation test (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-215704-S08441275112006011800000) ). Check the connector and terminal (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). Wiggle the harness and connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
6. BASIC INSPECTION When the malfunction is not confirmed in the DTC check, troubleshooting should be carried out in all the possible circuits considered as causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location causing the problem can be found quickly and efficiently. Therefore, using this check is essential in the engine troubleshooting. Is battery positive voltage 11 V or more when engine stopped? NO: Charge or replace battery. YES: Go to next step. Is engine cranked? NO: Proceed to «ON-VEHICLE TESTING»(ref-168684-S03478901702004111500000) and «STARTER RELAY TEST»(ref-168684-S41931870972004111500000), and continue to troubleshoot. YES: Go to next step. Does engine start? NO: Go to step 6. YES: Go to next step. Check air filter. PREPARATION: Remove the air filter. CHECK: Visual check that the air filter is not excessively dirty or oily. NG: Repair or replace 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. Shift the transmission into the N position. Connect the OBD II scan tool or hand-held tester to the DLC3 of the vehicle. CHECK Use CURRENT DATA to check the idle speed. OK: Idle speed: 650 to 750 RPM NG: Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-209750-S37864282122005121100000). OK: Go to next step. Check fuel pressure. PREPARATION: Be sure that enough fuel is in the tank. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Use 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-209797-S20312392262005121100000) ). CHECK: Check that the pulsation damper screw rises up when the fuel pump operation (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). HINT: At this time, you will hear a fuel flowing noise. NG: Proceed to page SF-7 and continue to troubleshoot. OK: Go to next step. Check for spark. PREPARATION: Disconnect the ignition coil. 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 to 10 seconds at a time. NG: Proceed to «IGNITION SYSTEM»(ref-209808-S14400878892005121100000) and continue to troubleshoot. OK: Proceed to problem symptoms table on «PROBLEM SYMPTOMS TABLE»(ref-209750-S37864282122005121100000).
7. DATA LIST HINT: Using the hand-held tester DATA LIST allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the DATA LIST early in troubleshooting is one way to shorten labor time. NOTE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST. According to the display on tester, read the "DATA LIST".
8. ACTIVE TEST HINT: Performing the ACTIVE TEST using the hand-held tester or the OBD II scan tool allows the relay, VSV, actuator and so on to operate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one method to shorten diagnostic time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch OFF. Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Push the "ON" button of the hand-held tester or the OBD II scan tool. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST. According to the display on tester, perform the "ACTIVE TEST".
9. DEFINITION OF TERMS
10. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used in this manual along with their definitions.
11. The monitor will run whenever the following DTCs are not present (Monitor disablement List) HINT: This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on the left are being set. As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not performed.
12. O2S TEST RESULT INTRODUCTION The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBD II scan tool. Based on this, you can find the O2S's conditions. The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snapshot" value that is taken after monitoring and therefore is not dynamic. In this repair manual, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items: TEST ID (a code applied to each TEST DATA) Description of TEST DATA Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.) Unit Standard Value If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon. HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER Connect the hand-held tester to the DLC3. On the tester screen, select the following menus: DIAGNOSIS/CARB OBDII/O2S TEST RESULT. A list of the O2S equipped on the vehicle will be displayed. Select the desired O2S and press ENTER. The following screen will appear. Press HELP and * simultaneously. More information will appear. Example: The hand-held tester displays "17" as a value of the "TIME $81" (Scheme 116) 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
13. CHECKING MONITOR STATUS HINT: "MONITOR RESULT" indicates normal or malfunction of each component and system when judgment has done. HOW TO READ DATA (using the hand-held tester) Connect the hand-held tester to the DLC3. Enter the following menus: "MONITOR RESULT" from "DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR RESULT" the Test ID will appear at the beginning of each line, following by INCMP, PASS or FAIL. HINT: INCMP: Stands for "incomplete" the diagnosis is incomplete. PASS: The component or system is operating normally. FAIL: A malfunction has been detected. Select a Test ID that you want from the list and press the "ENTER" button. You will see the following screen: VAL (TEST VALUE) [Test Data] [Unit] LMT (TEST LIMIT) [Test Limit] [Unit] TLT [Test Limit Type] By pressing the "HELP" button, you can see more information. HINT: Monitor test results can be viewed in the MONITOR RESULT screen. Monitor test results indicate the latest malfunction judgement result of this diagnostic. TEST VALUE indicates the detection parameter value (Example: P0128 Thermostat Malfunction = Engine coolant temperature) at the time of malfunction (or normal) judgement is done. TEST LIMIT indicates a threshold of malfunction judgement (Example: P0128 Thermostat Malfunction = 75°C (167°F)). When the monitor runs, the monitored Parameter's VALUE is recorded. The value is then compared to the TEST LIMIT to determine if the result is PASS or FAIL. By comparing the Parameter VALUE to the TEST LIMIT, it is possible to determine the degree of failure. In rare cases, the monitor may have passed even with a DTC set and MIL illuminated. The monitor may have failed on a previous trip, and then passed on the most recent trip. This would indicated an intermittent problem may be the cause of the DTC.

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

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

If a malfunction code is displayed during the DTC check in check mode, check the circuit for the codes listed in the table below.

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

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

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

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

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CIRCUIT INSPECTION

DTC INDEX

INSPECTION PROCEDURE

HINT

Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records the engine conditions when the malfunction is detected. When troubleshooting, it is useful to determine 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 H7, H8, H9 or H10 heated oxygen sensor connector. CHECK Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to next step.
2. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD 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 between terminals of the ECM connectors and body ground. 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-209797-S20666751432005121100000) ). NG: Check and repair harness or connector between EFI or ECD relay and heated oxygen sensor, and heated oxygen sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records t 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 OBD II scan tool or hand-held tester, and read value of mass air flow rate PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch ON and push the OBD II scan tool or 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: B: Go to step 6 . C: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). 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: NG: Go to step 5 . OK: Go to next step.
3. Check voltage between terminal VG of ECM connector and body ground. PREPARATION: Start the engine. CHECK: Measure the voltage between the specified terminal of the E8 ECM connector. HINT: The shift position should be P or N and the A/C switch should be turned OFF. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ) 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 E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace mass air flow meter.
5. Check for open and short in harness and connector between mass air flow meter and EFI or ECD relay. Check EFI or ECD No. 2 fuse: PREPARATION: Remove the EFI or ECD No. 2 fuse from the cowl side J/B LH. CHECK: Check for continuity in the EFI or ECD No. 2 fuse. OK: Continuity Check harness and connector: PREPARATION: Install the EFI or ECD No. 2 fuse. Disconnect the M1 mass air flow meter connector. Remove the EFI or ECD relay from the engine room R/B. CHECK Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Check ECM power source circuit (See «CIRCUIT DESCRIPTION»(ref-209750-S25607994992005121100000) ).
6. Check continuity between terminal E2G of ECM connector and body ground. CHECK: Check the resistance between terminal of the E8 ECM connector and body ground. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to next step.
7. 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 E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace mass air flow meter.

CIRCUIT DESCRIPTION

Refer to DTC P0100, P0102 - P0103 .

Scheme 160

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 161

1. Are there any other codes (besides DTC P0101) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to DLC3. Turn the ignition switch ON and push the hand-held tester or 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: HINT: If any other codes besides P0101 are output, perform the troubleshooting for those codes first. B: Replace mass air flow meter. A: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ).

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 162

Scheme 163

Scheme 164

Scheme 165

Scheme 166

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: 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-209750-S08930194342005121100000) ). 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: Connect terminals THA and E2 of the E8 ECM connector. HINT: Before checking, do a visual and contact pressure checks 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-215704-S35264831822006011800000) ).
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 E8 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-209797-S20666751432005121100000) ).

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

Scheme 167

Scheme 168

Scheme 169

Scheme 170

Scheme 171

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: 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-209750-S08930194342005121100000) ). A: Go to next step.
2. Check for open in harness or ECM. PREPARATION: Disconnect the E2 engine coolant temperature (ECT) sensor connector. Connect terminals 1 and 2 of the engine coolant temperature 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: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace engine coolant temperature sensor. NG: Go to next step.
3. Check for open in harness or ECM. PREPARATION: Disconnect the E2 engine coolant temperature sensor connector. Connect terminals THW and E2 of the E8 ECM connector. HINT: Before checking, do a visual and contact pressure checks 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: 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-215704-S35264831822006011800000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the E2 engine coolant temperature sensor connector. Turn the ignition switch ON. When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. CHECK: Read the temperature value on the OBD II scan tool or the hand-held tester. OK: Temperature value: -40°C (-40°F) OK: Replace engine coolant temperature sensor. NG: Go to next step.
5. Check for short in harness or ECM. PREPARATION: Disconnect the E8 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: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

Refer to DTC P0115, P0117 - P0118 .

Scheme 172

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

Replace engine coolant temperature sensor.

HINT

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

Hand-held tester

Scheme 173

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Scheme 176

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Scheme 180

1. Connect hand-held tester, and read the voltage for throttle position sensor data. 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 OBD II scan tool main switch ON. 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 T24 throttle control motor and sensor connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to next step.
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminals of the E8 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to next step.
4. Replace throttle body (See «THROTTLE BODY»(ref-209797-S20518331782005121100000) ). Go: Go to next step.
5. Check if DTC output recur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). RESULT: B: System is OK. A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 181

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Scheme 187

1. Check for open and short in harness and connector between ECM and throttle position sensor. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to next step.
2. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminals of the E8 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to next step.
3. Replace throttle body (See «THROTTLE BODY»(ref-209797-S20518331782005121100000) ). Go: Go to next step.
4. Check if DTC output recur. PREPARATION: Clear the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Start the engine. Run the engine at idle for 15 seconds or more. CHECK: Read the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). RESULT: B: System is OK. A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

HINT

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

Replace throttle control motor and sensor (See THROTTLE BODY ).

Refer to DTC P0115, P0117 - P0118 .

Scheme 188

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

Scheme 189

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 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: 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-209750-S20472950682005121100000) ). A: Go to next step.
2. Inspect thermostat (See «INSPECT THERMOSTAT»(ref-209802-S28486614052005121100000) ). NG: Replace thermostat (See «REMOVAL»(ref-209802-S05101733242005121100000) ). OK: Go to next step.
3. Check cooling system. CHECK: Check that there is detect 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: Replace engine coolant temperature sensor.

HINT

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

Scheme 190

1. Are there any other codes (besides DTC P0128) being output? PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or 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: HINT: If any other codes besides P0128 are output, perform the troubleshooting for those DTCs first. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ). A: Go to next step.
2. Check cooling system. CHECK: Check that there is a defect in the cooling system which causes over-cool, such as abnormal radiator fan operation, modified cooling system and so on. NG: Repair or replace cooling system. OK: Go to next step.
3. Check thermostat (See «INSPECT THERMOSTAT»(ref-209802-S28486614052005121100000) ). NG: Replace thermostat. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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.

Scheme 191

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 %.

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

RESULT

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

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

Scheme 192

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 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.
3. A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 193

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Scheme 201

Scheme 202

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 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: 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-209750-S20472950682005121100000) ). 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 (See the following table). OK: Go to step 9 . NG: Go to next step
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H7, H8, H9 or H10 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to next step
4. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD 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 H7, H8, H9 or H10 heated oxygen sensor connector. Disconnect the E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to next step
6. Check air induction system (See «SFI SYSTEM»(ref-209797) ). 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-209797-S20312392262005121100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI SYSTEM»(ref-209797) ). OK: Go to next step
8. Check injector injection (See «INSPECTION»(ref-209797-S40200985112005121100000) ). NG: Replace injector. OK: Replace heated oxygen sensor.
9. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go: Go to next step
10. Is there DTC P0130, P0150, P2195, P2196, P2197 or P2198 being output again? NO: Check for Intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

Refer to DTC P0031 - P0032, P0037 - P0038, P0051 - P0052, P0057 - P0058 .

Scheme 203

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 204

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 K 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 205

Scheme 206

Scheme 207

Scheme 208

Scheme 209

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.

Scheme 210

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

Scheme 211

Front HO2S frequency monitor (idling)

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

Scheme 212

Front HO2S frequency monitor (cruse)

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

Scheme 213

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

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

Scheme 214

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

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

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

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

Scheme 215

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Scheme 222

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Scheme 224

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 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: 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-209750-S20472950682005121100000) ). 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 while idling the OBD II scan tool or hand-held tester. OK: Heated oxygen sensor output voltage: Alternates between less than 0.35 V and more than 0.45 V, and period of "t" must exist less than 0.6 seconds (See the following graphic). OK: Go to step 9 . NG: Go to next step
3. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H7, H8, H9 or H10 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to next step
4. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD 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 H7, H8, H9 or H10 heated oxygen sensor connector. Disconnect the E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to next step
6. Check air induction system (See «SFI SYSTEM»(ref-209797) ). 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-209797-S20312392262005121100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI SYSTEM»(ref-209797) ). OK: Go to next step
8. Check injector injection (See «INSPECTION»(ref-209797-S40200985112005121100000) ). NG: Replace injector. OK: Replace heated oxygen sensor.
9. Perform confirmation driving pattern (See «DTC P0130, P0150, P2195, P2196 - P2198»(ref-209750-S38741246702005121100000) ) HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go: GO TO NEXT STEP.
10. Is there DTC P0133 or P0153 being output again? NO: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). YES: Replace heated oxygen sensor.

Refer to DTC P0031 - P0032, P0037 - P0038, P0051 - P0052, P0057 - P0058 .

Scheme 225

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.
4. After confirming DTC P0134 and P0154, check the output voltage of the heated oxygen sensor in the "DIAGNOSIS / ENHANCE OBD II / 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 0.5 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 226

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

For displaying the graph indication, enter "ACTIVE TEST / A/F CONTROL / USER DATA" then select " O2S.

B1S1 and O2S B1S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

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

Scheme 227

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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 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: 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-209750-S20472950682005121100000) ). 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 H7, H8, H9 or H10 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to Next Step
5. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD relay. OK: Go to Next Step
6. Check for open and short in harness and connector between ECM and heated oxygen sensor (bank 1, 2 sensor 1). PREPARATION: Disconnect the H7 or H9 heated oxygen sensor connector. Disconnect the E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: 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 - P0308»(ref-209750-S06613605452005121100000) ). OK: Go to Next Step
8. Check air induction system (See «SFI SYSTEM»(ref-209797) ). 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-209797-S20312392262005121100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI SYSTEM»(ref-209797) ). OK: Go to Next Step
10. Check injector injection (See «INSPECTION»(ref-209797-S40200985112005121100000) ) NG: Replace injector. 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, P0150, P2195, P2196 - P2198»(ref-209750-S38741246702005121100000) ). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go: Go to Next Step
13. Are there DTCs P0134 and P0154 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). 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-209750-S08930194342005121100000) ). YES: DTCs P0134 and P0154 are caused by running out of fuel.

Refer to DTC P0031 - P0032, P0037 - P0038, P0051 - P0052, P0057 - P0058 .

Scheme 236

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.

Scheme 237

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

Scheme 238

Rear HO2S slow response monitor

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

Scheme 239

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.

Scheme 240

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 0.5 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 241

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

or 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.

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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 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: 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-209750-S20472950682005121100000) ). A: Go to Next Page
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 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 H7, H8, H9 or H10 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to Next Step
4. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD 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 H8 or H10 heated oxygen sensor connector. Disconnect the E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace heated oxygen sensor.
6. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go: Go to Next Step
7. Is the DTC P0136 or P0156 being output again? NO: Check for intermittent problems. YES: Replace heated oxygen sensor.

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

The short-term fuel trim is the short-term fuel compensation used to maintain the 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 251

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 recorder. 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 252

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

Example

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

Scheme 253

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Scheme 255

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 0.5 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 256

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).

r 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 (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

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1. Check air induction system (See «SFI SYSTEM»(ref-209797) ). 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-209797-S40200985112005121100000) ). NG: Replace injector. OK: Go to Next Step
4. Check mass air flow meter. PREPARATION: Remove the mass air flow meter. CHECK: Inspect output voltage. Apply battery voltage across terminals +B and E2G. Connect the positive (+) tester 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: 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 «IGNITION SYSTEM»(ref-209808-S14400878892005121100000) ). NG: Repair or replace ignition system. OK: Go to Next Step
7. Check fuel pressure (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and replace fuel pump, pressure regulator, fuel pipe line and filter (See «SFI SYSTEM»(ref-209797) ). 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 (See the following table). OK: Go to step 17 . NG: Go to Next Step
10. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the H7, H8, H9 or H10 heated oxygen sensor connector. CHECK: Measure resistance between terminals of the heated oxygen sensor. OK: NG: Replace heated oxygen sensor. OK: Go to Next Step
11. Check EFI or ECD relay. PREPARATION: Remove the EFI or ECD relay from the engine room R/B. CHECK: Inspect the EFI or ECD relay. OK: NG: Replace EFI or ECD 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 H7, H8, H9 or H10 heated oxygen sensor connector. Disconnect the E7 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Replace or replace harness or connector. OK: Go to Next Step
13. Replace heated oxygen sensor. Go: Go to Next Step
14. Perform confirmation driving pattern. 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-209750-S08930194342005121100000) ). (*1) Start the engine and let it idle until engine coolant temperature is 75 °C (167 °F) or more. (*2) Drive the vehicle at 19 mph (30 km/h) or more for 3 minutes or more. (*3) Let the engine idle for approx. 2 minutes. (*4) Perform steps (e) and (g) at least 3 times. HINT: If a malfunction exists, the MIL will be illuminated during step (f). NOTE: If the conditions in this test are not strictly followed, detecting a malfunction may be difficult. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (e) to (f), and then do step (f) again. GO: Go to Next Step
15. Is there DTC P0171, P0172, P0174 or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ) 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-209750-S08930194342005121100000) ). 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: Go to Next Step
18. Is there DTC P0171, P0172 P0174 and/or P0175 being output again? NO: Go to step 22 . YES: Go to Next Step
19. Replace heated oxygen sensor. GO: Go to Next Step
20. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). GO: Go to Next Step
21. Is the DTC P0171, P0172, P0174 and/or P0175 being output again? YES: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ) 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-209750-S08930194342005121100000) ). 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 271

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Scheme 273

HINT

This diagnostic chart is based on premise that engine is started. If the engine is not started, proceed to 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, as well as other data from the time when a malfunction occurred.

Scheme 274

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1. Check voltage between terminal FPR and E1 of ECM. CHECK: Measure the voltage between terminals of E8 and E10 ECM connectors. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). 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: 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 E8 ECM connector. CHECK: Measure the resistance between wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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 or 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 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: 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 «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ). 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: 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 (See «IGNITION SYSTEM»(ref-209808-S14400878892005121100000) ). Check electrode gap. OK: No large carbon deposit present. Not wet with gasoline or oil. Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.) NOTE: If adjusting the gap of a new spark plug, bend only "the base / ground" electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug. PREPARATION: Install the spark plug to the ignition coil assembly. Disconnect the injector connector. Ground spark plug. CHECK: Check if spark occurs while engine is being cracked. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. OK: Spark 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: Go To Next Step
7. Check for open and short in harness and connector between ignition coil and ECM. Check the harness and connector between the ignition coil and the ECM (IGF terminal) connectors: PREPARATION: Disconnect the l1,l2,l3,l4,l5,l6,l7 or l8 ignition coil connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: Check the harness and connector between the ignition coil and the ECM (IGT terminal) connectors: PREPARATION: Disconnect the l1,l2,l3,l4,l5,l6,l7 or l8 ignition coil connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: OK: Replace ignition coil with igniter, then confirm that there is no misfire. NG: Repair or replace harness or connector.
8. Check ECM terminal of misfiring cylinder. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between the terminals of the E6, E7 and E8 ECM connectors. OK: OK: Go to step 11 . NG: Go To Next Step
9. Check injector resistance of misfiring cylinder (See «INJECTOR»(ref-209797-S10710492902005121100000) ). NG: Replace injector. 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 l9,l10,l11,l12,l13,l14,l15 or l16 injector connector. Disconnect the E6, E7 or E8 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: Check the harness and connector between the injector connector and the ignition switch: PREPARATION: Disconnect the l9,l10,l11,l12,l13,l14,l15 or l16 injector connector. Disconnect the l18 ignition switch connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to Next Step
11. Check injector injection of misfiring cylinder (See «INSPECTION»(ref-209797-S40200985112005121100000) ). NG: Replace injector. OK: Go to Next Step
12. Check compression pressure of misfiring cylinder (See «COMPRESSION»(ref-209781-S28614946852005121100000) ). NG: Repair or replace. OK: Go to Next Step
13. Check valve clearance of misfiring cylinder (See «VALVE CLEARANCE»(ref-209781-S12332874272005121100000) ). NG: Adjust valve clearance. OK: Go to Next Step
14. Check result of step 4 switch step by number of misfire cylinder. B: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). A: Go to Next Step
15. Check valve timing (Check for looseness or a jumped tooth of timing belt) (See «INSTALLATION»(ref-209781-S20467061782005121100000) ). NG: Adjust valve timing (Repair or replace timing belt). OK: Go to Next Step
16. Check fuel pressure (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «SFI SYSTEM»(ref-209797) ). 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. Select the item "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. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF". Read its value displayed on the hand-held tester or the OBD II scan tool. OK: 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 sensor. OK: Go to Next Step
19. Switch step by number of misfire cylinder (Refer result of step 4). B: Go to step 5 . A: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ).

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 303

HINT

1. Bank 1 refers to the bank that includes cylinder No. 1.
2. Bank 2 refers 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.

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

HINT

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

Scheme 304

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

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1. Connect OBD II scan tool or hand-held tester, and check knock sensor circuit. PREPARATION: Connect the OBD II scan tool or hand-held tester to the DLC3. Disconnect the EC1 connector. Connect the terminals of the disconnected EC1 male connector and EC1 female as follows. Turn ignition switch ON and push the OBD II scan tool or hand-held tester main switch ON. After the engine is warmed up, perform quick racing to 4,000 RPM 3 times. CHECK: Check the DTC. RESULT: Type II: Go to step 3 . Type I: Go to Next Step
2. Check for open and short in harness and connector between EC1 connector and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
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-215704-S35264831822006011800000) ). HINT: If DTC P0325 has changed to P0330, check the knock sensor circuit on the bank 1 side. If DTC P0330 has changed to P0325, check the knock sensor circuit on the bank 2 side. NG: Repair or replace harness or connector. OK: Replace knock sensor.

The crankshaft position sensor 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 308

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 309

Scheme 310

HINT

1. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data record 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

1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
2. Start the engine and push the hand-held tester or the OBD II scan tool main switch ON.
3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD".

1. 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 311

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1. Check resistance of crankshaft position sensor. PREPARATION: Disconnect the C3 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 C3 crankshaft position sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: 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 «REMOVAL»(ref-209781-S38297666172005121100000) ). CHECK: Check the teeth of sensor plate. NG: Replace sensor plate. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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 316

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 317

Scheme 318

HINT

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

Scheme 319

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1. Check resistance of camshaft position sensor. PREPARATION: Disconnect the C1 camshaft position sensor connector. CHECK: Measure the resistance between terminals 1 and 2. OK: NOTE: " Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). NG: Replace camshaft position sensor. OK: Go to next step
2. Check for open and short in harness and connector between ECM and camshaft position sensor. PREPARATION: Disconnect the C1 camshaft position sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: 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 «REMOVAL»(ref-209781-S19449274192005121100000) ). CHECK: Check the LH camshaft timing belt pulley. NG: Replace LH camshaft timing pulley. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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

Scheme 324

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1. Check spark plug and spark (See «IGNITION SYSTEM»(ref-209808-S14400878892005121100000) ). 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 l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil will igniter connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connectors. OK: 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 l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil with igniter connector. Turn the ignition switch ON. CHECK: Measure the voltage between the E6 and E8 ECM connectors. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Replace Ignition coil with igniter.
4. Check for open and short in harness and connector in IGT signal circuit between ECM and ignition coil with igniter. PREPARATION: Disconnect the l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil connector. Disconnect the E8 ECM connector. CHECK: Check the resistance between the wire harness side connector. OK: 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 E6 and E8 ECM connectors when the engine is cranked. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to next step
6. Disconnect ignition coil with igniter connector, and check voltage between terminals IGT1 - IGT8 of ECM connector. PREPARATION: Disconnect the l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil with igniter connector. CHECK: Measure the voltage between terminals the E6 and E8 ECM connectors when the engine is cranked. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to next step
7. Check ignition coil with igniter power source circuit. PREPARATION: Disconnect the l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil with igniter connector. CHECK: Measure the voltage between the terminal of the wire harness side connector and body ground. OK: OK: Repair ignition coil with igniter. NG: Go to next step
8. Check for open and short in harness and connector between ignition switch and ignition coil with igniter. PREPARATION: Disconnect the l1, l2, l3, l4, l5, l6, l7 or l8 ignition coil with igniter connector. Disconnect the l18 ignition switch connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace ignition coil with igniter.

HINT

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

Scheme 341

Scheme 342

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 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: HINT: If any other codes besides "P0420 and/or P0430" are output, perform the troubleshooting for those DTCs SST. B: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ). 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 «INSPECTION»(ref-209797-S35931656872005121100000) ). HINT: Refer to the hint following the end of this flowchart. NG: Replace heated oxygen sensor. OK: Go to Next Step
4. Check heated oxygen sensor (bank 1, 2 sensor 2) (See «INSPECTION»(ref-209797-S35931656872005121100000) ). HINT: Refer to the hint following the end of this flowchart. NG: Replace heated oxygen sensor. OK: Replace the front and rear three-way catalytic converter in the bank a malfunction is detected. 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). 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 0.5 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 (0.5 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich. A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV) or P2418 (Pressure switching valve) or P0451 (Evaporative Pressure Sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
3. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Hand-held tester

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1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go to Next Step
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to Next Step
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-209795-S12055191302005121100000) ). NG: Replace fuel tank cap. OK: Go to Next Step
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to Next Step
5. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the EVAP VSV from the charcoal canister. Start the engine. Select the item "EVAP (ALON) / ALL" in the ACTIVE TEST and operate EVAP VSV. CHECK: When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK: Go to step 9. NG: Go to Next Step
6. Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole, damage and blockage. NG: Repair or replace vacuum hose. OK: Go to Next Step
7. Check operation of EVAP VSV (See «INSPECTION»(ref-209797-S11715519692005121100000) ). NG: Replace EVAP VSV. OK: Go to Next Step
8. Check for open and short in harness and connector between EFI or ECD relay and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
9. Check CCV. PREPARATION: Disconnect the vacuum hose for the CCV VSV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the item "CAN CTRL VSV / ALL" in the ACTIVE TEST and operate 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. OK: Go to step 13 . NG: Go to Next Step
10. Check vacuum hose between CCV and charcoal canister. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage, and blockage. NG: Repair or replace vacuum hose. OK: Go to Next Step
11. Check operation of CCV (See «INSPECTION»(ref-209797-S27543420192005121100000) ). NG: Replace CCV. OK: Go to Next Step
12. Check for open and short in harness and connector between EFI or ECD relay and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
13. Check pressure switching valve. PREPARATION: Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD II / ACTIVE TEST" mode on the hand-held tester. Select the item "TANK BYPASS VSV / ALL" in the ACTIVE TEST and operate pressure switching valve. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 16 . NG: Go to Next Step
14. Check operation of pressure switching valve (See «INSPECTION»(ref-209797-S33929497542005121100000) ). NG: Replace pressure switching valve. OK: Go to Next Step
15. Check for open and short in harness and connector between EFI or ECD relay and pressure switching valve, and pressure switching valve and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
16. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Fuel tank filler pipe Hoses and tubes around fuel tank NG: Repair or replace evaporative emission leak part. OK: Go to Next Step
17. Check vacuum hoses between vapor pressure sensor and fuel tank, and charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG: Repair or replace vacuum hose. OK: Go to Next Step
18. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe (See «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-209795-S35747622232005121100000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace hose and tube. OK: Go to Next Step
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Turn the ignition switch ON. CHECK: Measure the voltage between terminals the E8 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors at following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 22 . NG: Go to Next Step
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
22. Check fuel tank inlet valve. NG: Replace fuel tank inlet valve. OK: Go to Next Step
23. Check fuel tank. NG: Replace fuel tank. OK: Go to Next Step
24. Check charcoal canister for cranks, hole and damage. NG: Replace charcoal canister. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check that fuel tank cap meets OEM specifications. NG: Replace with a cap that meets OEM specifications. OK: Go to Next Step
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to Next Step
3. Check fuel tank cap (See «EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM»(ref-209795-S12055191302005121100000) ). NG: Replace fuel tank cap. OK: Go to Next Step
4. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to Next Step
5. Check whether hose close to fuel tank has been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace evaporative emissions leak part. OK: Go to Next Step
6. Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal canister and pressure switching valve. CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG: Repair or replace vacuum hose. OK: Go to Next Step
7. Check hose and tube between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe (See «PARTS LAYOUT AND SCHEMATIC DRAWING»(ref-209795-S35747622232005121100000) ), fuel EVAP pipe and fuel tube under the floor, fuel tube under the floor and charcoal canister. Check the hose and tube for cracks, hole and damage. NG: Repair or replace hose and tube. OK: Go to Next Step
8. Check vacuum hoses ((8) and (9) in see scheme 370 in «CIRCUIT DESCRIPTION»(ref-209750-S04033243792005121100000) ). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage, and blockage. NG: Repair or replace vacuum hose. OK: Go to Next Step
9. Check VSV connector for EVAP, VSV connector for CCV, VSV connector for pressure switching valve and vapor pressure sensor connector for looseness and disconnection. NG: Repair or connect VSV or sensor connector. OK: Go to Next Step
10. Check charcoal canister for cracks, hole and damage. NG: Replace charcoal canister. OK: Go to Next Step
11. Check voltage between terminals VC and E2 of ECM connector. CHECK: Turn the ignition switch ON. CHECK: Measure the voltage between terminals the E8 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step
12. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors at following condition (1) and (2). Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Condition (1) Voltage: 2.9 to 3.7 V Condition (2) Voltage: 0.5 V or less OK: Go to step 14. NG: Go to Next Step
13. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
14. Check EVAP VSV. PREPARATION: Remove the glove compartment door (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal PRG of the ECM connector and body ground (ON). Disconnect between terminal PRG of the ECM connector and body ground (OFF). OK: VSV is ON: Air from port E flows out through port F. VSV is OFF: Air does not flow from port E to port F. OK: Go to step 17. NG: Go to Next Step
15. Check operation of EVAP VSV (See «INSPECTION»(ref-209797-S11715519692005121100000) ). NG: Replace EVAP VSV. OK: Go to Next Step
16. Check for open and short in harness and connector between EFI or ECD relay and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
17. Check CCV. PREPARATION: Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal CCV of the ECM connector and body ground (ON). Disconnect the terminal CCV of the ECM connect and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 20. NG: Go to Next Step.
18. Check operation of CCV (See «INSPECTION»(ref-209797-S27543420192005121100000) ). NG: Replace CCV. OK: Go to Next Step.
19. Check for open and short in harness and connector between EFI or ECD relay and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
20. Check pressure switching valve. PREPARATION: Turn the ignition switch ON. CHECK: Check the VSV function. Connect the terminal TBP of the ECM connector and body ground (ON). Disconnect the terminal TBP of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 23. NG: Go to Next Step.
21. Check operation of pressure switching valve (See «INSPECTION»(ref-209797-S33929497542005121100000) ). NG: Replace pressure switching valve. OK: Go to Next Step.
22. Check for open and short in harness and connector between EFI or ECD relay and pressure switching valve, and pressure switching valve, and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).
23. Check fuel tank inlet valve. NG: Replace fuel tank inlet valve. OK: Go to Next Step.
24. Check fuel tank. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap.

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

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1. Check voltage between terminals VC and E2 of ECM connector. CHECK: Turn the ignition switch ON. CHECK: Measure the voltage between terminals of the E8 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step.
2. Check voltage between terminals PTNK and E2 of ECM connectors. 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-209750-S08930194342005121100000) ). NG: Go to Next Step.
3. Check for open and short in harness and connector between vapor pressure sensor and ECM. PREPARATION: Disconnect the V1 vapor pressure sensor connector. Disconnect the E8 and E10 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: 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.

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HINT

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

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1. Check operation of speedometer. CHECK: Drive the vehicle and check if the operation of the speedometer in the combination meter is normal. HINT: The vehicle speed is operating normally if the speedometer display is normal. NG: Check speedometer circuit. (See «TROUBLESHOOTING»(ref-215711) ). OK: Go to Next Step.
2. Check voltage between terminal SPD and E1 of ECM connector. PREPARATION: Shift the shift lever to neutral. Jack up the rear wheel on one side. Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminal of the E6 and E9 ECM connector when the wheel is turned slowly. OK: HINT: The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly. NG: Check and repair harness and connector between combination meter and ECM. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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 ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.

HINT

Normal condition is as shown in the table.

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HINT

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

Hand-held tester

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1. Check operation of stop light. CHECK: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG: Check and repair stop light circuit. OK: Go to Next Step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the cowl side J/B LH. 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-215719) ). NG: Replace stop light switch. OK: Go to Next Step.
4. Check STP signal and ST1- 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: CHECK: Measure the voltage between the specified terminals of the E6 and E9 ECM connectors. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). NG: Go to Next Step.
5. Check harness and connector between ECM and stop light switch. PREPARATION: Disconnect the S5 stop light switch connector. Disconnect the E9 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check operation of stop light. CHECK: Check if the stop lights come on and go off normally when the brake pedal is operated and released. NG: Check and repair stop light circuit. OK: Go to Next Step.
2. Check STOP fuse. PREPARATION: Remove the STOP fuse from the cowl side J/B LH. CHECK: Check the continuity of the STOP fuse. OK: Continuity NG: Check for short in all harness and components connected to STOP fuse. OK
3. Check stop light switch (See «STOP LIGHT SYSTEM»(ref-215719) ). NG: Replace stop light switch. OK: Go to Next Step.
4. Check STP signal. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminals of the E6 and E9 ECM connectors. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). NG: Go to Next Step.
5. Check harness and connector between ECM and stop light switch. PREPARATION: Disconnect the S5 stop light switch connector. Disconnect the E9 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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

Scheme 380

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 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: 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-209750-S20472950682005121100000) ). A: Go to Next Step
2. Check connection of PCV pining. NG: Repair or replace PCV piping. OK: Go to Next Step.
3. Check air induction system (See «SFI SYSTEM»(ref-209797) ). 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-209797-S20518331782005121100000) ).

HINT

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

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1. Check EFI or ECD No.1 fuse of engine room J/B PREPARATION: Remove the EFI or ECD No. 1 fuse from the engine room J/B. CHECK: Check the continuity of the EFI or ECD No. 1 fuse. OK: Continuity NG: Check for short in all harness and components connected to EFI or ECD No. 1 fuse. OK: Go to Next Step
2. Check voltage between terminal BATT and E1 of ECM connector. CHECK: Measure the voltage between terminals of the E6 and E10 ECM connector. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). NG: Go to next step
3. Check for open and short in harness and connector between ECM and EFI or ECD No. 1 fuse, EFI or ECD No. 1 fuse and battery. Check the harness and the connector between the EFI or ECD No. 1 fuse and the ECM: PREPARATION: Remove the EFI or ECD No. 1 fuse from the engine room J/B. Disconnect the E10 ECM connector. CHECK: Measure the resistance between the wire harness side connector. OK: Check the harness and connector between the EFI or ECD No. 1 fuse and the battery: PREPARATION: Remove the EFI or ECD No. 1 fuse from the engine room J/B. Disconnect the battery positive terminal. CHECK: Measure the resistance between the wire harness side connector. OK: NG: Repair or replace harness or connector. OK: Check and replace engine room J/B.

HINT

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

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

HINT

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

Hand-held tester

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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: OK: Go to step 5 . NG: Go to Next Step
2. Check park/neutral position switch (See «CIRCUIT INSPECTION»(ref-209752-S08130835522005121100000) ). NG: Replace park/neutral position switch. Go to next step 5 after the replacement. OK: Go to Next Step
3. Check ignition switch (See «INSPECTION»(ref-215713-S40721109212006011800000) ). NG: Replace ignition switch. Go the next step 5 after the replacement. OK: Go to Next Step
4. 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: NG: Repair or replace harness or connector. OK: Go to Next Step
5. Check DTC reoccur. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. Clear DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccur. RESULT: A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). B: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: 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: Go to step 5 . NG: Go to Next Step
2. Check park/neutral position switch (See «CIRCUIT INSPECTION»(ref-209752-S08130835522005121100000) ). NG: Replace park/neutral position switch. Go to next step 5 after the replacement. OK: Go to Next Step
3. Check ignition switch (See «INSPECTION»(ref-215713-S40721109212006011800000) ). NG: Replace ignition switch. Go to next step 5 after the replacement. OK: Go to Next Step
4. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: 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) NG: Repair or replace harness or connector. OK: Go to Next Step
5. Check DTC reoccur. REPARATION: Connect the OBD II scan tool to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. Clear DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Drive the vehicle more than 40 km/h (25 mph) for 20 seconds or more. CHECK: Check DTC reoccur. RESULT: A: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). B: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ).

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 394

HINT

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

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1. Check throttle control motor. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. CHECK: Measure the resistance between terminals of the throttle control motor. OK: NG: Replace throttle body (See «THROTTLE BODY»(ref-209797-S20518331782005121100000) ). OK: Go to Next Step
2. Check for open and short in harness and connector between throttle control motor and ECM. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to next Step
3. Visually check throttle valve. CHECK: Check between the throttle valve and the housing for foreign objects. Also, check if the valve can open and close smoothly. NG: Remove foreign object and clean throttle body. OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ).

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 400

HINT

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

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1. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check whether or not a foreign matter is caught between the throttle valve and housing. Also, if the valve can open and close smoothly. NG: Remove foreign matter and clean throttle body. OK: Go to Next Step
2. Check throttle control motor. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. CHECK: Measure the resistance between terminals of the throttle control motor. OK: NG: Replace throttle body (See «THROTTLE BODY»(ref-209797-S20518331782005121100000) ). OK: Go to Next Step
3. Check for open and short in harness and connector between ECM and throttle control motor. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. Disconnect the E6 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ).

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

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HINT

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

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1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse from the engine room J/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 E6 and E9 ECM connector. OK: OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). NG: Go to Next Step
3. Check for open or short in harness or connector between battery and ETCS fuse, ETCS fuse and ECM. Check the harness and the connector between the ETCS fuse and the ECM: PREPARATION: Remove the ETCS fuse from the engine room J/B. Disconnect the E9 ECM connector. CHECK: Measure the resistance between the wire harness side connector. OK: Check the harness and connector between the ETCS fuse and the battery: PREPARATION: Remove the ETCS fuse from the engine room J/B. Disconnect the battery positive terminal. CHECK: Measure the resistance between the wire harness side connector. OK: NG: Repair or replace harness or connector. OK: Check engine room J/B.

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

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

Scheme 415

HINT

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

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1. 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 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: 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-209750-S20472950682005121100000) ). A: Go to Next Step
2. Check throttle control motor. PREPARATION: Disconnect the T24 throttle control motor and sensor connector. CHECK: Measure the resistance between terminals of the throttle control motor. OK: NG: Replace throttle body (See «THROTTLE BODY»(ref-209797-S20518331782005121100000) ). OK: Go to Next Step
3. Replace ECM and clear DTC (Check if DTC outputs reoccur). PREPARATION: Replace ECM. Clear the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). 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. OK: No DTC output. OK: System is normal. NG: Replace throttle body.

HINT

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

Hand-held tester

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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: OK: Go to step 5 . NG
2. Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2 EPA and EPA2 circuit between ECM and accelerator pedal position sensor. PREPARATION: Disconnect the A13 accelerator pedal position sensor connector. Disconnect the E10 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or 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 A13 accelerator pedal position sensor connector. CHECK: Measure the voltage between the specified terminals of the E10 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step.
4. Replace accelerator pedal assembly (See «ACCELERATOR PEDAL POSITION SENSOR»(ref-209797-S14889557932005121100000) ). Go: Go to Next Step.
5. Check if DTC output recur? PREPARATION: Connect the hand-held tester to the DLC3. Disconnect the battery terminals or remove the EFI or ECD 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-209797-S20666751432005121100000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check for open and short in harness and connector in VCPA, VCP2, VPA, VPA2 EPA and EPA2 circuit between ECM and accelerator pedal position sensor. PREPARATION: Disconnect the A13 accelerator pedal position sensor connector. Disconnect the E10 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: NG: Repair or replace harness or connector. OK: Go to Next Step.
2. Check voltage between terminals VCPA and EPA, and VCP2 and EPA2 of ECM terminals. PREPARATION: Turn the ignition switch ON. Disconnect the A13 accelerator pedal position sensor connector. CHECK: Measure the voltage between the specified terminals of the E10 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step.
3. Replace accelerator pedal assembly (See «ACCELERATOR PEDAL POSITION SENSOR»(ref-209797-S14889557932005121100000) ). Go: Go to Next Step.
4. Check if DTC output recur? PREPARATION: Connect the OBD II scan tool to the DLC3. Disconnect the battery terminals or remove the EFI or ECD 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-209797-S20666751432005121100000) ).

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

Hand-held tester

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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: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). NG: Go to Next Step.
2. Check for open and short in harness and connector between accelerator pedal position sensor and ECM. PREPARATION: Disconnect the A13 accelerator pedal position sensor connector. Disconnect the E10 ECM connector. CHECK: Measure the resistance between the wire harness side connectors. OK: Standard (Check for open): Standard (Check for short): NG: Repair or replace harness or connector. OK: Replace accelerator pedal assembly.

OBD II scan tool (excluding hand-held tester)

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1. Check voltage between terminals VPA and EPA, VPA2 and EPA2 of ECM connector. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between the specified terminals of the E10 ECM connector. OK: OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). NG: Go to Next Step.
2. Check for open and short in harness and connector between accelerator pedal position sensor and ECM. PREPARATION: Turn the ignition switch ON. Disconnect the A13 accelerator pedal position sensor connector. CHECK: Measure the voltage between the specified terminals of the E10 ECM connector. OK: NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Replace accelerator pedal assembly.

ECM Power Source Circuit

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

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

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1. Check voltage between terminals +B and E1 of ECM connectors. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminals +B and E1 of the ECM connectors. OK: Voltage: 9 to 14 V OK: Proceed to next circuit inspection shown on problem symptoms table (See «TROUBLESHOOTING»(ref-215711) ). 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-215704-S35264831822006011800000) ). 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: Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGSW of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Go to step 6 . NG: Go to Next Step.
4. Check IGN fuse. PREPARATION: Remove the IGN fuse from the cowl side J/B RH. 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 «INSPECTION»(ref-215713-S40721109212006011800000) ). NG: Replace ignition switch. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
6. Check voltage between terminal MREL of ECM connector and body ground. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminal MREL of the ECM connector and body ground. OK: Voltage: 9 to 14 V NG: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). OK: Go to Next Step.
7. Check EFI or ECD No. 1 fuse of engine room J/B. PREPARATION: Remove the EFI or ECD No. 1 fuse from the engine room J/B. CHECK: Check continuity of EFI or ECD No. 1 fuse. OK: Continuity NG: Check for short in all harness and components connected to EFI or ECD No. 1 fuse. OK: Go to Next Step.
8. Check EFI or ECD relay (See «EFI MAIN RELAY»(ref-209797-S00700444072005121100000) ). NG: Replace EFI or ECD 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-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Check and repair harness or connector between EFI or ECD No. 1 fuse and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

Refer to DTC P0230 FUEL PUMP PRIMARY CIRCUIT .

Hand-held tester

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1. Check fuel pump operation (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). OK: Go to step 8 . NG: Go to Next Step
2. Connect hand-held tester, and check operation of fuel pump relay. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD. CHECK: Check the operation of the fuel pump relay when it is switched ON and OFF by the hand-held tester. OK: Operating noise can be heard from the relay. OK: Go to step 4 . NG: Go to Next Step.
3. Check operation of fuel pump relay (See «FUEL PUMP RELAY»(ref-209797-S33948859932005121100000) ). NG: Replace fuel pump relay. OK: Go to Next Step.
4. Check fuel pump (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). NG: Repair or replace fuel pump. OK: Go to Next Step.
5. Check circuit opening relay (See «CIRCUIT OPENING RELAY»(ref-209797-S32231583742005121100000) ). NG: Replace circuit opening relay. OK: Go to Next Step.
6. Check for open in harness and connector between EFI or ECD relay and fuel pump, and fuel pump and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Go to Next Step.
7. Check voltage between terminal FC and E1 of ECM connector. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminal FC of the ECM connector and body ground. OK: Voltage: 9 to 14 V NG: Check for open in harness and connector between battery and FC terminal of ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). OK: Proceed to problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-209750-S37864282122005121100000) ).
8. Check fuel pump resistor (See «FUEL PUMP RESISTOR»(ref-209797-S32845905832005121100000) ). NG: Replace fuel pump resistor. OK: Check for open in harness and connector between circuit opening relay and fuel pump resistor, and fuel pump resistor and fuel pump (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

OBD II scan tool (excluding hand-held tester)

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1. Check operation of fuel pump (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). OK: Go to step 7 . NG: Go to Next Step
2. Check operation of fuel pump relay (See «FUEL PUMP RELAY»(ref-209797-S33948859932005121100000) ). NG: Replace fuel pump relay. OK: Go to Next Step
3. Check fuel pump (See «FUEL PUMP»(ref-209797-S20312392262005121100000) ). NG: Repair or replace fuel pump. OK: Go to Next Step.
4. Check circuit opening relay (See «CIRCUIT OPENING RELAY»(ref-209797-S32231583742005121100000) ). NG: Replace circuit opening relay. OK: Go to Next Step.
5. Check for open in harness and connector between EFI or ECD relay and fuel pump, and fuel pump and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Go to Next Step.
6. Check voltage between terminal FC of ECM connector and body ground. PREPARATION: Turn the ignition switch ON. CHECK: Measure the voltage between terminal FC of the ECM connector and body ground. OK: Voltage: 9 to 14 V NG: Check for open in harness and connector between battery and FC terminal of ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). OK: Proceed to problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-209750-S37864282122005121100000) ).
7. Check fuel pump resistor (See «FUEL PUMP RESISTOR»(ref-209797-S32845905832005121100000) ). NG: Replace fuel pump resistor. OK: Check for open in harness and connector between circuit opening relay and fuel pump resistor, fuel pump resistor and fuel pump (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

The starter is controlled by the ECM, when the ECM detects a start signal (STSW) from the ignition switch, this system monitors the engine speed (NE) and continues to operate the starter until it has determined that the engine has started (engine speed 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 START position, check whether the starter motor starts. OK: Starter motor starts. OK: Check for intermittent problems (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). 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. 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: NG: Go to step 5 . OK: Go to Next Step.
3. Check voltage between terminal STAR, STSW and E1 of ECM connector. CHECK: Measure the voltage between the terminals of the E6 and E7 ECM connectors, while cranking the engine (ignition switch START position). OK: RESULT: B: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). C: Go to step 9 . A: Go to Next Step.
4. Check park/neutral position switch. PREPARATION: Remove the P1 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: Check and repair harness and connector between park/neutral position switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
5. Check starter relay (See «STARTERS»(ref-168684) ). NG: Replace starter relay. OK: Go to Next Step.
6. Check for open and short in harness and connector between park/neutral position switch and starter relay, starter relay and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Go to Next Step
7. Check engine room R/B (Starter relay voltage). PREPARATION: Remove the starter relay from the engine room R/B. CHECK: Measure the voltage between the terminal of the engine room R/B and body ground. OK: NG: Check and repair harness and connector between starter relay and battery. OK: Go to Next Step.
8. Check starter (See «STARTERS»(ref-168684) ). NG: Repair or replace starter. OK: Go to Next Step
9. 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: Check for open in harness and connector between ECM and ignition switch, ignition switch and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

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-209750-S08930194342005121100000) ). NG: Go to Next Step.
2. Check voltage between terminal STSW, STAR, STA and E1 of ECM connector. CHECK: Measure the voltage between the terminals of E6, E7 and E8 ECM connectors, while cranking the engine (ignition switch START position). OK: RESULT: B: Go to step 7 . C: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). D: Go to step 8 . A: Go to Next Step.
3. Check starter relay (See «STARTERS»(ref-168684) ). NG: Replace starter relay. OK: Go to Next Step.
4. Check for open and short in harness and connector between park/neutral position switch and starter relay, starter relay and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). NG: Repair or replace harness or connector. OK: Go to Next Step.
5. Check engine room R/B (Starter relay voltage). PREPARATION: Remove the starter relay from the engine room R/B. CHECK: Measure the voltage between the terminal of the engine room R/B and body ground. OK: NG: Check and repair harness and connector between starter relay and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ). OK: Go to Next Step.
6. Check starter (See «STARTERS»(ref-168684) ). NG: Repair or replace starter. OK: Check and repair harness and connector between starter relay and starter, starter and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
7. Check park/neutral position switch. PREPARATION: Remove the P1 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: Check and repair harness and connector between park/neutral position switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
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: Check and replace harness and connector between ECM and ignition switch, ignition switch and battery (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).

If the ECM detects a trouble, the MIL lights up. At this time, the ECM records a DTC in the memory.

Scheme 469

HINT

Troubleshoot each trouble symptom in accordance with the chart below.

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1. Clear DTC. 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. Read the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Clear the DTC (See «PRE-CHECK»(ref-209750-S08930194342005121100000) ). Check that MIL does not light up. Standard: MIL does not light up OK: Repair circuit indicated by output code (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209750-S20472950682005121100000) ). NG: Go to Next Step.
2. Check harness and connector (Check for short in wire harness). Disconnect the E10 ECM connector. Turn the ignition switch ON. Check that MIL does not light up. Standard: MIL does not light up OK: Replace ECM (See «ENGINE CONTROL MODULE (ECM)»(ref-209797-S20666751432005121100000) ). NG: Check and repair harness and connector between combination meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).
3. Check that MIL lights up. Check that MIL lights up when turning the ignition switch ON. Standard: MIL lights up OK: System OK. NG: Go to Next Step.
4. Inspect combination meter assy (MIL circuit). See the combination meter troubleshooting in «INSPECTION»(ref-215722-S40655477152006011900000) . NG: Repair or replace bulb or combination meter assembly. OK: Check and repair harness and connector between combination meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-215704-S35264831822006011800000) ).