Engine Controls - (5VZ-FE) - Diagnostics: Diagnosis Toyota Tundra I рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshoot in accordance with the procedure shown.

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

1. DIAGNOSIS SYSTEM Description When troubleshooting On-Board Diagnostic (OBD II) vehicles, the vehicle must be connected to the OBD II scan tool (in compliance with SAE J1978) or the hand-held tester. Various data output from the vehicle's ECM can then be read. OBD II regulations require that the vehicle's onboard computer illuminates the Malfunction Indicator Light (MIL) on the instrument panel when the computer detects a malfunction in: 1) the emission control system/components, or 2) the powertrain control components (which affect vehicle emissions), or 3) the computer. In addition, the applicable Diagnostic Trouble Codes (DTCs) prescribed by SAE J2012 are recorded in the ECM memory (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). 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 DTCs, 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 DTC chart «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). The diagnosis system operates in normal mode during normal vehicle use. In "normal mode", 2 trip detection logic* is used to ensure accurate detection of malfunctions. A "check mode", is also available to technicians as an option. In "check mode", 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent malfunctions (hand-held tester only) (See step 3 ). *2 trip detection logic: When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the ignition switch is turned OFF and then ON again, and the same malfunction is detected again, the MIL will illuminate (2nd trip). Freeze frame data: The freeze frame data records the engine conditions (fuel system, calculated load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc.) when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred. Priorities for troubleshooting: When multiple DTCs occur, find out the order in which the DTCs should be inspected by checking the component's DTC chart. If no instructions are written in the DTC chart, check DTCs in the following order of priority: DTCs other than fuel trim malfunction DTCs (P0171 and P0172) and misfire DTCs (P0300 - P0306). Fuel trim malfunction DTCs (P0171 and P0172). Misfire DTCs (P0300 - P0306). Check the DLC3. The vehicle's ECM uses the ISO 9141-2 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 OBD II scan tool or the hand-held tester to the DLC3, turn the ignition switch to 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 of the original vehicle. If the communication is still not possible 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 battery voltage. Battery Voltage: 11 to 14V If voltage is below 11 V, recharge the battery before proceeding. Check MIL. The MIL turns on when the ignition switch is turned ON and the engine is not running. HINT: If the MIL does not light up, troubleshoot the combination meter (See «COMBINATION METER»(ref-182158) ). When the engine is started, the MIL should turn off. If the lamp remains on, the diagnosis system has detected a malfunction or abnormality in the system. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) to confirm the details of the DTCs.
2. DTC CHECK / CLEAR (Normal Mode) NOTE: If no DTC appears in the 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. Check the DTC. Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch to 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, select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. For the OBD II scan tool, see its instruction manual. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) to confirm the details of the DTCs. NOTE: When simulating a symptom with the OBD II scan tool (excluding hand- held tester) to check DTCs, use normal mode. For DTCs 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 to OFF after the symptom is simulated once. Then repeat the simulation process again. When the problem has been simulated again, the MIL illuminates and the DTCs are recorded in the ECM. Check the pending fault code using the Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool. Clear the DTC (using OBD II scan tool or hand-held tester). Connect the OBD II scan tool or the hand-held tester to the DLC3. Turn the ignition switch to 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. Clear DTC (not using OBD II scan tool or hand-held tester) Disconnecting the battery cable, or remove the EFI NO. 1 fuse AND ETCS fuse more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).
3. CHECK MODE PROCEDURE HINT: Hand-held tester only: Check mode has a higher sensitivity to detect malfunctions and can detect malfunction that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect. Check mode procedure. 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 to OFF. Connect the hand-held tester to the DLC3 in the at the lower left of the instrument panel. Turn the ignition switch to ON and push the hand-held tester 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 figure. NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the hand-held tester is used to change the ECM from normal mode to check mode or vice-versa; or 2) during check mode, the ignition switch is turned from ON to ACC or OFF. Start the engine. The MIL should turn off after the engine starts. Simulate the conditions of the malfunction described by the customer. After simulating the malfunction conditions, use the hand-held tester diagnosis selector to check the DTC, freeze frame data and other data. After checking the DTC, inspect the applicable circuit. Using OBD II scan tool or hand-held tester: Clear DTC Connect the OBD II scan tool or hand-held tester to the DLC3. Turn the ignition switch to 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.
4. Clear DTC (not using OBD II scan tool or hand-held tester) Disconnecting the battery cable, or remove the EFI NO. 1 fuse more than 60 seconds. After disconnecting the battery terminal, perform the "INITIALIZE" procedure (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).
5. FAIL-SAFE CHART If any of the following codes are recorded, the ECM enters into the ail-safe mode.
6. CHECK FOR INTERMITTENT PROBLEMS HINT: Hand-held tester only: By putting the vehicle's ECM in check mode, 1 trip detection logic is possible instead of 2 trip detection logic and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems. Clear the DTCs (See step 2 ). Set the check mode (See step 3 ). Perform a simulation test (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-181807-S09356980302005080400000) ). Check the connector and terminal (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). Handle the connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
7. BASIC INSPECTION When the malfunction code is not confirmed in the DTC check, troubleshooting should be performed in all the possible circuits considered as the cause of the problems. In many cases, by carrying out the basic engine check shown in the following flow chart, the location causing the problem can be found quickly and efficiently. Therefore, use this check is essential in the engine troubleshooting. Is battery positive voltage 11 V or more when engine is stopped? NO: Charge or replace battery. YES: Go to next step. Is engine cranked? NO: Proceed to «STARTERS»(ref-163557), and continue to troubleshoot. YES: Go to next step. Does engine start? NO: Go to step 7. YES: Go to next step. Check air filter. PREPARATION: Remove the air filter. CHECK: Visually check that the air filter is not dirty or excessive oily. NG: 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 hand-held tester or OBD II scan tool to the DLC3 of the vehicle. CHECK: Use the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL" to check the idle speed. OK: Idle speed: 650 to 750 RPM NG: Proceed to «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000). OK: Go to next step. Check ignition timing (See «IGNITION TIMING (5VZ-FE)»(ref-181735) ). NG: Proceed to «IGNITION SYSTEM (5VZ-FE)»(ref-181836), and continue to troubleshoot. OK: Proceed to «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000). 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. Without hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). CHECK: Check for the fuel pressure in the fuel inlet hose when it is pinched by hand. HINT: At this time, you will hear the fuel flowing noise. NG: Proceed to «FUEL PUMP»(ref-181795-S34907562362006080100000), and continue to troubleshoot. OK: Go to next step. Check for spark. PREPARATION: Remove the ignition coil or disconnect the high-tension cord from the spark plug. Remove the spark plug. Connect the ignition coil or high-tension cord to the spark plug again, and connect the ignition coil connector. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, don't crank the engine for more than 5-10 seconds at a time. NG: Proceed to «IGNITION SYSTEM (5VZ-FE)»(ref-181836), and continue to troubleshoot. OK: Proceed to «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000).
8. DATA LIST HINT: According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time. NOTE: The values given below for "Normal Condition" are representative values. So, a vehicle may still be normal even if its value differs from those listed here. So, do not depend solely on the "Normal Condition" here when deciding whether a part is faulty or not. Warm up the engine. Turn the ignition switch OFF. Connect the OBD II scan tool or the Hand-held tester to the DLC3. Turn the ignition switch to ON. Turn ON the hand-held tester. Select the item: DIAGNOSIS / ENHANCED OBD II / DATA LIST. According to the display on tester, read the DATA LIST.
9. ACTIVE TEST HINT: Performing the ACTIVE TEST using the OBD II scan tool or Hand-held tester 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 of the method to shorten the labor time. It is possible to display the DATA LIST during the ACTIVE TEST. Warm up the engine. Turn the ignition switch OFF. Connect the OBD II scan tool or the Hand-held tester to the DLC3. Turn the ignition switch ON. According to the display on tester, read the "ACTIVE TEST".
10. DEFINITION OF TERMS TERMS DEFINITION CHART Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details). Related DTCs Diagnostic code Typical enabling condition Preconditions that allow the ECM to detect malfunctions. With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction threshold(s). Sequence of operation The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunction. While another sensor is being monitored, the next sensor or component will not be monitored until the previous monitoring has concluded. Required sensor/components The sensors and components that are used by the ECM to detect malfunctions. Frequency of operation The number of times that the ECM checks for malfunctions per driving cycle. "Once per driving cycle" means that the ECM detects malfunction only one time during a single driving cycle. "Continuous" means that the ECM detects malfunction every time when enabling condition is met. Duration The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a DTC. This timing begins after the "typical enabling conditions" are met. Malfunction thresholds Beyond this value, the ECM will conclude that there is a malfunction and set a DTC. MIL operation MIL illumination timing after a defect is detected. "Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction. "2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2nd driving cycle.
11. TOYOTA/LEXUS PART AND SYSTEM NAME LIST This reference list indicates the part names used along with their definitions. PART AND SYSTEM NAME LIST TOYOTA/LEXUS name Definition Toyota HCAC system, Hydro-Carbon Adsorptive Catalyst (HCAC) system, HC adsorptive three-way catalyst HC adsorptive three-way catalytic converter Variable Valve Timing sensor, VVT sensor Camshaft position sensor Variable valve timing system, VVT system Camshaft timing control system Camshaft timing oil control valve, Oil control valve, OCV, VVT, VSV Camshaft timing oil control valve Variable timing and lift, VVTL Camshaft timing and lift control Crankshaft position sensor "A" Crankshaft position sensor Engine speed sensor Crankshaft position sensor THA Intake air temperature Knock control module Engine knock control module Knock sensor Engine knock sensor Mass or volume air flow circuit Mass air flow sensor circuit Vacuum sensor Manifold air pressure sensor Internal control module, Control module, Engine control ECU, PCM Power train control module FC idle Deceleration fuel cut Idle air control valve Idle speed control CCV, Canister close valve VSV for canister control Evaporative emissions canister vent valve EVAP VSV, Vacuum switching valve assembly No. 1, EVAP VSV, Purge VSV Evaporative emissions canister purge valve VSV for pressure switching valve, Bypass VSV Evaporative emission pressure switching valve Vapor pressure sensor, EVAP pressure sensor, Evaporative emission control system pressure sensor Fuel tank pressure sensor Charcoal canister Evaporative emissions canister ORVR system On-board refueling vapor recovery system Intake manifold runner control Intake manifold tuning system Intake manifold runner valve, IMRV, IACV (runner valve) Intake manifold tuning valve Intake control VSV Intake manifold tuning solenoid valve AFS Air fuel ratio sensor O2 sensor Heater oxygen sensor Oxygen sensor pumping current circuit Oxygen sensor output signal Oxygen sensor reference ground circuit Oxygen sensor signal ground Accel position sensor Accelerator pedal position sensor Throttle actuator control motor, Actuator control motor, Electronic throttle motor, Throttle control motor Electronic throttle actuator Electronic throttle control system, Throttle actuator control system Electronic throttle control system Throttle/pedal position sensor, Throttle/pedal position switch, Throttle position sensor/switch Throttle position sensor Turbo press sensor Turbocharger pressure sensor Turbo VSV Turbocharger pressure control solenoid valve P/S pressure switch Power-steering pressure switch VSV for ACM Active control engine mount
12. List of Disable a Monitor HINT: This table below shows the ECM monitoring status for the components listed in the top of the table when the DTCs on the left of the table are 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.
13. O2S TEST RESULT INTRODUCTION The O2S TEST RESULT refers to the results of the engine control module (ECM) when it monitors the oxygen sensor (O2S), and it can be read using the hand-held tester or the generic OBDII scan tool. Based on this, you can find the O2S's conditions. The ECM monitors the O2S in the various items. You can read the monitor result (TEST DATA) of each monitor item using the O2S TEST RESULT. However, the output value of the TEST DATA is the latest "snapshot" value that is it taken after monitoring and therefore it is not dynamic. In this article, the description of the O2S TEST RESULT (for O2S related DTCs) are written in a table. This table consists of 5 items: TEST ID (a code applied to each TEST DATA) Description of TEST DATA Conversion Factor (When Conversion Factor has a value written in the table, multiply the TEST DATA value appearing on the scan tool by the Conversion Factor value. The result will be the required value.) Unit Standard Value If the TEST DATA value appearing on the scan tool is out of the standard value, the O2S is malfunctioning. If it is within the standard value, the O2S is functioning normally. However, if the value is on the borderline of the standard value, the O2S may malfunction very soon. HOW TO READ O2S TEST RESULT USING HAND-HELD TESTER Connect the hand-held tester to the DLC3. On the tester screen, select the following menus: DIAGNOSIS/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 iquest simultaneously. More information will appear. Example: The hand-held tester displays "17" as a value of the "TIME $81" (Scheme 36) Find the Conversion Factor value of "TIME $81" in the O2S TEST RESULT chart below. 0.3906 is specified for $81 in this chart. Multiply "17" in step (1) by 0.3906 (Conversion Factor) in the step (2). 17 x 0.3906 = 6.6% If the answer is within the standard value, the "TIME $81" can be confirmed to be normal. O2S TEST RESULT Chart O2S TEST RESULT DESCRIPTION TEST ID Description of TEST DATA Conversion Factor Unit Standard Value $81 Percentage of monitoring time when the O2S voltage is less than 0.05V Multiply 0.3906 % Within 60 %
14. CHECKING MONITOR STATUS NOTE: The Monitor Status is not applicable to the heated oxygen sensor (HO2S). The HO2S status can be checked with O2S TEST RESULT. INTRODUCTION The purpose of the monitor result (mode 6) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, EVAP and thermostat. The monitor result allows the OBD scan tool to display the monitor status, test value and test limit. The monitor status indicates whether the component is functioning normally or not (PASS or FAIL). The test value is the value that was used to determine the monitor status. When the test value is inside the test limit, the ECM determines the component is functioning normally (PASS). If the test value is outside the test limit, the ECM determines the component is malfunctioning (FAIL). A problem in these components/systems can be found by comparing the test value and test limit. The monitor result information is included under "MONITOR RESULT" in the DTC tests. PROCEDURE NOTE: The monitor result and test value are cleared when the ignition switch is turned OFF. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Clear the DTCs. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN (see «READINESS MONITOR DRIVE PATTERN»(ref-181812-S36362248052005080500000) ). Select from the tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name. INCMP: The component has not been monitored yet. PASS: The component is functioning normally. FAIL: The component is malfunctioning. Confirm that the component is set to either PASS or FAIL. Select the component (Label) and press ENTER. The accuracy test value appears when the monitor result is either PASS or FAIL. VAL The test value LMT: The test limit TLT: The test limit type. Either 0 or 1 is displayed. If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit. Compare the test value with the test limit. The test value is usually significantly higher or lower than the test limit. If the test value is on the borderline of the test limit, there is a potential malfunction in the component.

HINT

The monitor result might on rare occasions be PASS even if the MIL is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

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 with Diagnostic Trouble Codes (DTCs). Since various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called readiness monitors. The hand-held tester's software must be version 9.0 or newer to view the readiness monitor status. From the "Enhanced OBD II Menu", select "Monitor Status" to view the readiness monitor status. A generic OBD II scan tool can also be used to view the readiness monitor status. When the readiness monitor status reads "complete", the necessary conditions have been met for running performance tests for that readiness monitor. HINT: Many state Inspection and Maintenance (I/M) programs require a vehicle's readiness monitor status to show "complete". The Readiness Monitor will be reset to "incomplete" if: The ECM has lost battery power or blown a fuse DTCs have been cleared. The conditions for running the Readiness Monitor have not been met. If the readiness monitor status shows "incomplete", follow the appropriate readiness monitor drive pattern to change the status to "complete". CAUTION: Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns. NOTE: The following drive patterns are the fastest method of completing all the requirements necessary for making the readiness monitor status read "complete". If forced to momentarily stop a drive pattern due to traffic or other factors, the drive pattern can be resumed. Upon completion of the drive pattern, in most cases, the readiness monitor status will change to "complete". Sudden changes in vehicle load and speed, such as driving up and down hills and / or sudden acceleration, hinder readiness monitor completion.
2. CATALYST MONITOR (A/F sensor TYPE) Preconditions The monitor will not run unless: The MIL is OFF. Engine Coolant Temperature (ECT) is 75°C (167°F) or greater. Intake Air Temperature (IAT) is -10°C (14°F) or greater. NOTE: To complete the readiness test in cold ambient conditions (less than -10°C / 14°F). turn the ignition switch to the off position and then back to the ON position. Perform the drive pattern a second time. Drive Pattern Connect the OBD II scan tool to the DLC3 to check readiness monitor status and preconditions (refer to step "a"). Drive vehicle at 40 to 55mph (64 to 88km/h) for approximately 4 minutes. NOTE: Drive with smooth throttle operation and avoid sudden acceleration. If IAT was less than 10°C (50°F) when the engine was started, drive the vehicle at 40 to 55 mph (64 to 88 km/h) for an additional 4 minutes. Drive the vehicle allowing speed to fluctuate between 40 to 50 mph (64 to 80 km/h) for about 16 minutes. NOTE: Drive with smooth throttle operation and avoid sudden closure of the throttle. Check the status of the readiness monitor on the scan tool display. If readiness monitor status did not switch to complete, ensure preconditions are met, turn the ignition OFF, and then repeat steps (2) and (3).
3. EVAP MONITOR (VACUUM PRESSURE MONITOR) NOTE: A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pressure readiness monitor. Cold Soak Preconditions The monitor will not run unless: The MIL is OFF Fuel level is approximately 1/2 to 3/4 fuel. Altitude is 7,800 feet (2,400m) or less. Cold Soak Procedure Let vehicle cold soak for 8 hours or until the difference between IAT and ECT is less than 7°C (13°F). HINT: Example 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) Example 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) Preconditions The monitor will not run unless: The MIL is OFF Fuel level is approximately 1/2 to 3/4 fuel. The 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)* The cold Soak Procedure has been completed Before starting the engine, the difference between ECT and IAT must be less than 7°C (13°F) HINT: Example 1 ECT = 24°C (75°F) IAT = 16°C (60°F) Difference between ECT and IAT is 8°C (15°F) => The monitor will not run because difference between ECT and IAT is higher than 7°C (13°F) Example 2 ECT = 21°C (70°F) IAT = 20°C (68°F) Difference between ECT and IAT is 1°C (2°F) => The monitor will run because difference between ECT and IAT is less than 7°C (13°F) NOTE: The readiness test can be completed in cold ambient conditions (less than 4.4°C / 40°F) and / or high altitudes (more than 7,800 feet / 2,400 m). Finish the drive pattern, turn the ignition switch OFF and then on again, and repeat the drive pattern a second time. Drive Pattern Connect the OBD II scan tool to DLC3 to check monitor status and preconditions (refer to step "a"). Release pressure in fuel tank by removing the fuel tank cap and then reinstalling it. Start the engine and allow to idle until ECT is 75°C (167°F) or more. Run the engine at 3,000 RPM for about 10 seconds. With the engine idling, turn the A/C ON to create slight electrical load. Wait 15 to 50 minutes. NOTE: If the vehicle does not have A/C, put a slight electrical load on the engine by following the steps below: Set the parking brake securely. Use wheel chocks to secure the tires. Move the shift lever to drive (position D) and allow engine to idle for 15 to 50 minutes. Check if the readiness monitor status.
4. OXYGEN / A/F METER MONITOR (FRONT A/F METER AND REAR O2S SYSTEM) Preconditions The monitor will not run unless: The MIL is OFF Drive Pattern Connect the OBDII 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 40 to 70 mph (64 to 112 km/h) for at least 150 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more. Drive the vehicle at 25 to 40 mph (40 to 64 km/h) for at least 40 seconds. Stop the vehicle and allow the engine to idle for 10 seconds or more Perform steps (5) and (6) ten times. Check the readiness monitor status. If the readiness monitor status did not change to "complete", check the preconditions, turn the ignition switch OFF, and repeat steps (1) to (6).
5. OXYGEN / A/F SENSOR HEATER MONITOR Preconditions The monitor will not run unless: The MIL is OFF Drive Pattern Connect the OBDII 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 readiness monitor status. If the readiness monitor status did not change to "complete", check the preconditions, turn the ignition switch OFF, and repeat steps (2) and (3).

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

If a malfunction code is displayed during the DTC check in the check mode, check the circuit listed in the table below. For details of each code, refer to the appropriate test in the DTC chart.

DIAGNOSTIC TROUBLE CODES

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

CIRCUIT DESCRIPTION

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

HINT

Scheme 53

Scheme 54

1. This DTC is related to A/F sensor is in a malfunction, although the caption is oxygen sensor.
2. The ECM provides a pulse width to control current through the heater. The A/F ratio sensor heater circuit uses a relay on the B+ side of the circuit.

HINT

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

INSPECTION PROCEDURE

HINT

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

Scheme 55

Scheme 56

Scheme 57

Scheme 58

1. Check resistance of A/F sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4ohm at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
2. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step.
3. Check voltage between terminal HAF1 of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminal HAF1 of the ECM connector and body ground. OK: Voltage: 9 to 14V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Check and repair harness or connector between EFI relay (Marking: EFI) and A/F sensor, and A/F sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

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

HINT

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

Scheme 59

Scheme 60

HINT

1. Sensor 1 refers to the sensor closest to the engine body.
2. Sensor 2 refers to the sensor farthest from the engine body.

HINT

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

Scheme 61

Scheme 62

Scheme 63

Scheme 64

1. Check resistance of heated oxygen sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 23 to 16 ohm at 800°C (1,472°F) 23 to 32 ohm NG: Replace heated oxygen sensor. OK: Go to next step.
2. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: NG: Replace EFI relay. OK: Go to next step.
3. Check voltage between terminals HT2B of ECM connectors and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminal HT2B of the ECM connector and the body ground. HINT: Connect terminal HT2B to bank 1 sensor 2. OK: Voltage: 9 to 14V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Check and repair harness or connector between EFI relay (Marking: EFI) and heated oxygen sensor, and heated oxygen sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

The Mass Air Flow (MAF) meter uses a platinum hot wire. The hot wire air flow meter consists of a platinum hot wire, temperature sensor and a control circuit installed in a plastic housing. The hot wire air flow meter works in principle that the hot wire and temperature sensor located in the intake air bypass of the housing detect any changes in the intake air temperature.

The hot wire is maintained at the set temperature by controlling the current flow through the hot wire. This current flow is then measured as the output voltage of the air flow meter.

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

Scheme 65

Scheme 66

HINT

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

Scheme 67

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 68

Scheme 69

Scheme 70

1. Connect hand-held tester or OBD II scan tool, and read value of mass air flow rate. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool main switch ON. Start the engine. Select the item: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF. CHECK: Read the MAF rate on the hand-held tester or the OBD II scan tool. RESULT: MAF RATE RESULT MAF Rate (g/s) Proceed to 0.0 Type I 1 less than equal to MAF Rate less than equal to 270.0 or more ( (1) ) Type II 271.0 or more Type III (1) *1: The value must change when the throttle valve is opened or closed. Type II: Check intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). Type III: Go to step 5 . Type I: Go to next step.
2. Check voltage of mass air flow meter power source. PREPARATION: Disconnect the MAF meter connector. Turn the ignition switch to ON. CHECK: Measure the voltage between terminal 1 of the MAF meter connector and the body ground. OK: Voltage: 9 to 14V NG: Check for open in harness and connector between EFI relay (Marking: EFI) and mass air flow meter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
3. Check voltage between terminal VG of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Start the engine. CHECK: Measure the voltage between terminal VG of the ECM connector and the body ground while the engine is idling. OK: Voltage: 0.5 to 3.0 V (P or N position and A/C switch OFF) OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
4. Check for open and short in harness and connector between mass air flow meter and ECM, and mass air flow meter and EFI relay (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace mass air flow meter.
5. Check continuity between terminal E2G of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Check the continuity between terminal E2G of the ECM connector and the body ground. OK: Continuity (1 ohm or less) NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
6. Check for open in harness and connector between mass air flow meter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace mass air flow meter.

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

Scheme 71

HINT

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

1. Are there any other codes (besides DTC P0101) being output? NG: Replace mass air flow meter. YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ).

The intake air temperature sensor is built in the MAF meter and senses the intake air temperature.

A thermistor built in the sensor changes the resistance value according to the intake air temperature.

The lower the intake air temperature is, the greater the thermistor resistance value becomes, and the higher the intake air temperature is, the lower the thermistor resistance value becomes (Scheme 72)

The intake air temperature sensor is connected to the ECM (See below). The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA via resistor R. That is, resistor R and the intake air temperature sensor are connected in series. When the resistance value of the intake air temperature sensor changes in accordance with changes in the intake air temperature, the potential at terminal THA also changes. Based on this signal, the ECM increases the fuel injection volume to improve driveability during cold engine operation. If the ECM detects the DTC P0110, it operates the fail safe function in which the intake air temperature is assumed to be 20°C (68°F).

Scheme 72

Scheme 73

HINT

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

TEMPERATURE DISPLAY

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 74

Scheme 75

Scheme 76

Scheme 77

1. Connect hand-held tester or OBD II scan tool, and read value of intake air temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Same value as actual intake air temperature HINT: If there is open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F). If there is short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more. NG: -40 °C (-40°F) Go to step 2. 140°C (284°F) or more Go to step 4 . OK: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).
2. Check for open in harness or ECM. PREPARATION: Disconnect the MAF meter connector. Connect the sensor wire harness terminals together. Turn the ignition switch to ON. Select the Item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace mass air flow meter. NG: Go to next step.
3. Check for open in harness or ECM. PREPARATION: Disconnect the MAF meter connector. Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Connect terminals THA and E2 of the ECM connector together. Turn the ignition switch to ON. Select the Item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR". HINT: The MAF meter connector is disconnected. Before checking, do a visual and contact check of the pressure of the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK: Open in harness between terminals E2 and THA, repair or replace harness. NG: Confirm good connection at ECM. If OK, replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the MAF meter connector. Turn the ignition switch to ON. Select the Item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: - 40°C (-40°F) OK: Replace mass air flow meter. NG: Go to next step.
5. Check for short in harness or ECM. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Disconnect the E7 ECM connector. HINT: The MAF meter connector is disconnected. Turn the ignition switch to ON. Select the Item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: - 40°C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

A thermistor built in the Engine Coolant Temperature (ECT) sensor changes the resistance value according to the ECT.

The structure of the sensor and connection to the ECM is the same as those of the intake air temperature circuit malfunction. See DTC P0110 Intake Air Temperature Circuit, DTC P0112 Intake Air Temperature Circuit Low Input, DTC P0113 Intake Air Temperature Circuit High Input .

HINT

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

Scheme 78

HINT

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

TEMPERATURE DISPLAY

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 79

Scheme 80

Scheme 81

Scheme 82

1. Connect hand-held tester or OBD II scan tool, and read value of engine coolant temperature. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Same as actual engine coolant temperature HINT: If there is open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F). If there is short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more. NG: -40 °C (-40°F) Go to step 2. 140°C (284°F) or more Go to step 4 . OK: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).
2. Check for open in harness or ECM. PREPARATION: Disconnect the ECT sensor connector. Connect the sensor wire harness terminals together. Turn the ignition switch to ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK: Confirm good connection at sensor. If OK, replace engine coolant temperature sensor. NG: Go to next step.
3. Check for open in harness or ECM. PREPARATION: Disconnect the ECT sensor connector. Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Connect terminals THW and E2 of the ECM connector. HINT: The ECT sensor connector is disconnected. Before checking, do a visual and contact pressure check of the pressure of the ECM connector (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). Turn the ignition switch to ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: 140°C (284°F) or more OK: Open in harness between terminals E2 and THW, repair or replace harness. NG: Confirm good connection at ECM. If OK, Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
4. Check for short in harness and ECM. PREPARATION: Disconnect the ECT sensor connector. Turn the ignition switch to ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK: Replace engine coolant temperature sensor (See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR»(ref-181795-S27754801142006080100000) ). NG: Go to next step.
5. Check for short in harness or ECM. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Disconnect the E7 ECM connector. HINT: The ECT sensor connector is disconnected. Turn the ignition switch to ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP". CHECK: Read the temperature value on the hand-held tester or the OBD II scan tool. OK: Temperature value: -40°C (-40°F) OK: Repair or replace harness or connector. NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

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

Scheme 83

HINT

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

1. Are there any other codes (beside DTC P0116) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check thermostat (See «THERMOSTAT (5VZ-FE)»(ref-181801) ). NG: Replace thermostat. OK: Replace engine coolant temperature sensor.

HINT

This is the procedure of throttle position sensor.

The throttle position sensor is mounted on the throttle body and it have 2 sensors to detect the throttle opening angle and a malfunction of the throttle position sensor.

The voltage applied to the terminals VTA and VTA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the throttle valve. The VTA is a signal to indicate the actual throttle valve opening angle which is used for the engine control, and the VTA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.

The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to the driving condition.

If this DTC is stored, the ECM shuts down the power for the throttle motor and the electromagnetic clutch, and the throttle valve is fully closed by the return spring.

However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 84

Scheme 85

HINT

Scheme 86

HINT

1. After confirming DTC P0120, P0122, P0123, P0220, P0222, P0223 and P2135 use the hand-held tester or the OBD II scan tool to confirm the throttle valve opening percentage and closed throttle position switch condition.
2. The THROTTLE POS means VTA signal as well as the THROTTLE POS #2 for the VTA2 signal.

Scheme 87

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.

Hand-held tester

Scheme 88

Scheme 89

Scheme 90

1. Connect hand-held tester, and read throttle valve opening percentage. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. CHECK: Read the throttle valve opening percentage for the VTA circuit and read the voltage for the VTA2 circuit. OK: ACCELERATOR PEDAL VALVE OPENING Accelerator pedal Throttle valve opening position expressed as percentage (VTA) Voltage (VTA2) Released 8 to 20 % 2.0 to 2.9 V Depressed 64 to 96 % 4.7 to 5.1V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
2. Check throttle position sensor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
4. Check voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VTA and E2, and VTA2 and E2 of the ECM connector. OK: VOLTAGE CHECK Accelerator pedal VTA - E2 VTA2 - E2 Released 0.4 to 1.0V 2.0 to 2.9V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Check for open and short in harness and connector in VC, VTA, VTA and E2 circuits between ECM and throttle position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 91

Scheme 92

1. Check throttle position sensor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
2. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
3. Check voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VTA and E2, and VTA2 and E2 of the ECM connector. OK: VOLTAGE CHECK Accelerator pedal VTA - E2 VTA2 - E2 Released 0.4 to 1.0V 2.0 to 2.9V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Check for open and short in harness and connector in VC, VTA, VTA and E2 circuits between ECM and throttle position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

Refer to DTC P0120 DTC P0120: THROTTLE PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT; DTC P0122: THROTTLE PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT; DTC P0123: THROTTLE PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT; DTC P0220: THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT; DTC P0222: THROTTLE PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT LOW INPUT; DTC P0223: THROTTLE PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT; DTC P2135: THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRECTION .

HINT

This is the procedure of throttle position sensor.

CONDITION (DTC P0121)

HINT

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

1. Are there any other codes (besides DTC P0121) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Replace throttle position sensor.

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

Scheme 93

HINT

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

1. Are there any other codes (beside P0125) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check thermostat (See «THERMOSTAT (5VZ-FE)»(ref-181801) ). NG: Replace thermostat. OK: Go to next step.
3. Check cooling system. CHECK: Check the cooling system for excessive cooling, such as abnormal radiator fan operation, modified cooling system and other defects. NG: Repair or replace cooling system. OK: Replace engine coolant temperature sensor.

HINT

This is the troubleshooting procedure of thermostat.

If the ECT does not reach 75°C (167°F) even after warming up, it is abnormal.

Scheme 94

Scheme 95

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

HINT

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

1. Check thermostat (See «THERMOSTAT (5VZ-FE)»(ref-181801) ). NG: Replace thermostat (See «THERMOSTAT (5VZ-FE)»(ref-181801) ). OK: Go to next step.
2. Check cooling system. CHECK: Check the cooling system for excessive cooling, such as abnormal radiator fan operation, modified cooling system and other defects. NG: Repair or replace cooling system. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

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

HINT

This DTC is related to A/F sensor, although the caption is oxygen sensor.

Scheme 96

HINT

1. Sensor 1 refers to the sensor closest to the engine body.
2. Sensor 2 refers to the sensor farthest from the engine body.
3. After confirming DTC P0134, use the hand-held tester or the OBD II scan tool to confirm output voltage of the A/F sensor (bank 1 sensor 1) from the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL".
4. The ECM controls the voltage of AF1+ and AF1- terminals of the ECM to the fixed voltage. Therefore it is impossible to confirm the A/F sensor output voltage without the hand-held tester or the OBD II scan tool.
5. OBD II scan tool (excluding hand-held tester) displays the one fifth of the A/F sensor output voltage which is displayed on the hand-held tester.

HINT

Hand-held tester only

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

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

HINT

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

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

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

Scheme 97

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

To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

1. A low A/F sensor voltage could be caused by a RICH air-fuel mixture. Check for conditions that would cause the engine to run with a RICH air-fuel mixture.
2. A high A/F sensor voltage could be caused by a LEAN air-fuel mixture. Check for conditions that would cause the engine to run with a LEAN air-fuel mixture.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
4. If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0134 is recorded. The MIL then comes on.

Scheme 98

Scheme 99

Scheme 100

1. Are there any other codes (besides DTC P0134) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Connect hand-held tester or OBD II scan tool, and read value for voltage output of A/F sensor (bank 1 sensor 1). PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensor (bank 1 sensor 1) with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the hand-held tester or the OBD II scan tool. CHECK: Hand-held tester only: Select the "DIAGNOSIS/ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow engine to idle for 30 seconds. Engine is racing at approx. 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully closed quickly. OK: Standard: Condition (1) and (2) Voltage change a little in the vicinity of 3.3 V (0.66 V)* (between approx. 3.1 to 3.5 V) as shown in the figure. Condition (3) A/F ratio sensor voltage increase to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the figure. HINT: Whenever the output voltage of the A/F sensor remains at approx. 3.3 V (0.660 V)* (see Malfunction Condition in (Scheme 98) ) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit). Whenever the output voltage of the A/F sensor remains at a certain value of approx. 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see Malfunction Condition in (Scheme 98) ) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F ratio sensor or ECM, you can obtain a constant voltage. *: When using the OBD II scan tool (excluding hand-held tester). OK: Go to step 15. NG: Go to next step.
3. Check connection of PCV valve and hose. NG: Repair or replace PCV valve and hose. OK: Go to next step.
4. Check resistance of A/F sensor heater (bank 1 sensor 1). PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4 ohm at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
5. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: TESTING CONNECTION CONDITION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
6. Check for open and short in harness and connector between ECM and A/F sensor (bank 1 sensor 1) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
7. Check air induction system (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). CHECK: Check for vacuum leaks in the air induction system. NG: Repair or replace. OK: Go to next step.
8. Check gas leak on exhaust system. NG: Repair or replace. OK: Go to next step.
9. Check fuel pressure (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). CHECK: Check fuel pressure (high or low fuel pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). OK: Go to next step.
10. Check injector injection (See «INJECTOR»(ref-181795-S05748533512006080100000) ). CHECK: Check injector injection (high or low fuel injection quantity or poor injection pattern). NG: Replace injector. OK: Go to next step.
11. Replace A/F sensor. Go to next step.
12. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
13. Is there DTC P0134 being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). NO: Go to next step.
14. Did vehicle run out of fuel in past? NG: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P0134 is caused by shortage of fuel.
15. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
16. Is there DTC P0134 being output again? NG: Go to step 20. YES: Go to next step.
17. Replace A/F sensor. Go to next step.
18. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
19. Is there DTC P0134 being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). NO: Go to next step.
20. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P0134 is caused by shortage of fuel.

To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the vicinity of the stoichiometric air-fuel ratio. This is used to detect the oxygen concentration in the exhaust gas and provide feedback to the computer for control of the air-fuel ratio.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the oxygen sensor informs the ECM of the LEAN condition (small electromotive force: < 0.45 V).

When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio the oxygen concentration in the exhaust gas in reduced and the oxygen sensor informs the ECM of the RICH condition (large electromotive force: > 0.45V).

The ECM judges by the electromotive force from the oxygen sensor whether the air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the oxygen sensor causes output of abnormal electromotive force, the ECM is unable to perform accurate air-fuel ratio control.

The oxygen sensors include a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.

Scheme 101

Scheme 102

HINT

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

O2S TEST RESULT

Refer to PRE-CHECK for detailed information.

HO2S Output Voltage (Rich or lean stuck)

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

OUTPUT VOLTAGE (RICH OR LEAN STUCK)

HO2S Output Voltage (Stuck Low)

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

OUTPUT VOLTAGE (STUCK LOW)

HINT

Hand-held tester only

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

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

HINT

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

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

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

Scheme 103

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

To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

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 104

Scheme 105

1. Are there any other codes (besides DTC P0136) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check output voltage of heated oxygen sensor. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. After warming up the engine, run the engine at 2,500 RPM for 3 minutes. On the 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 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 sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 11 to 16 ohm at 800°C (1,472°F) 23 to 32 ohm OK: Replace heated oxygen sensor. NG: Go to next step.
4. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: RELAY CONNECTION CONDITION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
5. Check for open and short in harness and connector between ECM and heated oxygen sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace heated oxygen sensor.
6. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000) . HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
7. Is the DTC P0136 being output again? NO: Check for intermittent problems. YES: Replace heated oxygen sensor.

The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim includes the short-term fuel trim and the long-term fuel trim. The short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal theoretical value. The signal from the A/F sensor is approximately proportional to the existing air-fuel ratio. Comparing it with the ideal theoretical value, the ECM reduces fuel volume immediately if the air-fuel ratio is RICH and increases fuel volume if it is LEAN. The long-term fuel trim compensates for the deviation from the central value of the short-term fuel trim which is stored up by each engine tolerance, and the deviation from the central value due to the passage of time and changes of environment. If both the short-term fuel trim and the long-term fuel trim exceed a certain value, it is detected as a malfunction and the MIL lights up.

Scheme 106

HINT

1. When DTC P0171 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 is recorded, the actual air-fuel ratio is on the RICH side.
2. If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 is recorded. The MIL then comes on.
3. If the total of the short-term fuel trim value and long-term fuel trim value is within +/- 35 % (75°C) or more), the system is functioning normally.
4. The A/F sensor (bank 1 sensor 1) output voltage and the short-term fuel trim value can be read using the hand-held tester or the OBD II scan tool.
5. The ECM controls the voltage of the AF1+ and AF1- terminals of the ECM to the fixed voltage. Therefore, it is impossible to confirm the A/F sensor output voltage without the hand-held tester or the OBD II scan tool.
6. OBD II scan tool (excluding hand-held tester) displays the one fifth of the A/F sensor (bank 1 sensor 1) output voltage which is displayed on the hand-held tester.

Scheme 107

Under closed-loop fuel control, fuel injection amounts that deviate from the ECM's estimated fuel amount will cause a change in the long-term fuel trim compensation value. This long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. And the deviation from the simulated fuel injection amount by the ECM affects 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

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

HINT

Hand-held tester only

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

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

HINT

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

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

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

Scheme 108

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

To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

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

Scheme 109

Scheme 110

Scheme 111

Scheme 112

1. Check air induction system (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace. OK: Go to next step.
2. Check connection of PCV valve and hose. NG: Repair or replace PCV valve and hose. OK: Go to next step.
3. Check injector injection (See «INJECTOR»(ref-181795-S05748533512006080100000) ). NG: Replace injector. OK: Go to next step.
4. Check mass air flow meter (See «MASS AIR FLOW (MAF) METER»(ref-181795-S03314201312006080100000) ) and engine coolant temperature sensor (See «INSPECTION»(ref-181795-S06199959392006080100000) ). NG: Repair or replace. OK: Go to next step.
5. Check for spark and ignition (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). NG: Repair or replace. OK: Go to next step.
6. Check fuel pressure (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). CHECK: Check the fuel pressure (high or low pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). OK: Go to next step.
7. Check gas leak on exhaust system. NG: Repair or replace. OK: Go to next step.
8. Connect the hand-held tester or OBD II scan tool and read value for voltage output of A/F sensor. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensor (bank 1 sensor 1) with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the hand-held tester or OBD II scan tool. CHECK: Hand-held tester only: Select the "DIAGNOSIS/ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow engine to idle for 30 seconds. Engine is racing at approx. 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully closed quickly. OK: Standard: Condition (1) and (2) Voltage change a little in the vicinity of 3.3 V (0.66 V)* (between approx. 3.1 to 3.5 V) as shown in the figure. Condition (3) A/F ratio sensor voltage increase to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the figure. HINT: Whenever the output voltage of the A/F sensor remains at approx. 3.3 V (0.660 V)* (see Malfunction Condition in (Scheme 109) ) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approx. 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see Malfunction Condition in (Scheme 109) ) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F ratio sensor or ECM, you can obtain a constant voltage. *: When using the OBD II scan tool (excluding hand-held tester). OK: Go to step 16. NG: Go to next step.
9. Check resistance of A/F sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4ohm at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
10. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: EFI RELAY CONDITION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
11. Check for open and short in harness and connector between ECM and A/F sensor (bank 1 sensor 1) (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
12. Replace A/F sensor. Go to next step.
13. Perform confirmation driving pattern. Clear the DTCs. Disconnect the battery cable or remove the EFI NO. 1 and ETCS fuses for 60 seconds or more. Connect the hand-held tester to the DLC3. Switch the hand-held tester from the normal mode to the check mode (see «PRE-CHECK»(ref-181812-S42723497822005080500000) ). Start the engine and warm it up with all the accessory switches OFF. Drive the vehicle at 38 to 75 RPM (60 to 120 km/h) and engine speed at 1,400 to 3,200 RPM for 3 to 5 minutes. HINT: If a malfunction exists, the MIL will be illuminated during step (e). 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 (d) to (e), and then do step (e) again. Go to next step.
14. Is there DTC P0171 or P0172 being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. NO: Go to next step.
15. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P0171 or P0172 is caused by shortage of fuel.
16. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
17. Is there DTC P0171 or P0172 being output again? NO: Go to step 21. YES: Go to next step.
18. Replace A/F sensor. Go to next step.
19. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
20. Are there DTC P0171 and/or P0172 being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). NO: Go to next step.
21. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P0171 or P0172 is caused by shortage of fuel.

Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in the crankshaft rotation for each cylinder.

The ECM counts the number of times the engine speed change rate indicates that misfire has occurred. And when the misfire rate equals to or exceeds the count of indicating that the engine condition has deteriorated, the MIL lights up.

If the misfire rate is high enough and the driving conditions will cause the catalyst to overheat, the MIL blinks when misfiring occurs.

HINT

1. For any particular 200 revolutions of engine, misfiring is detected, which can cause catalyst to overheat (This cause MIL to blink. 1 trip detection logic).
2. For any particular 1,000 revolutions of engine, misfiring is detected, which causes deterioration in emissions (This cause MIL to light up. 2 trip detection logic).

Scheme 113

HINT

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

Scheme 114

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

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

The ECM blinks the MIL (MIL blinks immediately) if

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

Scheme 115

HINT

1. If DTCs besides misfire are memorized simultaneously, first perform the troubleshooting for them.
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 vehicle is brought to the workshop and the misfire is not occurred, 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 the confirmation driving pattern).
4. On 6 and 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only an general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (i. e., P0301 - P0308). Under the following conditions, only P0300 code may be stored. Misfire starts in the high engine speed area or Misfire occurs only in the high engine speed area. Therefore, when a general misfire fault code (i.e., P0300) is only stored, erase the DTCs after read freeze frame data with the hand-held tester or the OBD II scan tool. Start the engine and drive the confirmation pattern (See the CONFIRMATION DRIVING PATTERN) and read the value of the misfire ratio for each cylinder (or DTC). Perform the repair correspond to the high misfire ratio cylinder (or the misfiring cylinder indicated by DTC). After completing the repair, confirm no misfire is occurring by driving the confirmation pattern.
5. When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data is besides the range of +/-20 %, there is a possibility that the air-fuel ratio is inclining either to RICH (-20 % or less) or LEAN (+20 % or more).
6. When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility or misfire only during warming up.
7. If the misfire cannot be reproduced, the reason may be because of the driving with lack or fuel, the use of improper fuel, a stain on ignition plug, etc.
8. Be sure to check the value on the misfire counter after the repair.

Scheme 116

Scheme 117

Scheme 118

1. Are there any other codes (besides DTC P0300, P0301, P0302, P0303, P0304, P0305 or P0306) being output? HINT: If any other code besides DTC (P0300, P0301, P0302, P0303, P0304, P0305 or P0306) output, perform the troubleshoot on that DTC. YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check wire harness and vacuum hose in engine room. CHECK: Check the connection conditions of wire harness and connector. Check the disconnection, piping and break of vacuum hose. NG: Repair or replace, then confirm that there is no misfire (See confirmation driving pattern). 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 to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/CYL #1 - CYL #6". Start the engine. CHECK: Read the number of misfire on the hand-held tester. HINT: When a misfire is not is reproduced, be sure to branch below based on the stored DTC. RESULT: HIGH MISFIRE High Misfire Rate Cylinder Proceed to 1 or 2 cylinders Type I More than 3 cylinders Type II Type II: Go to step 17 . Type I: Go to next step.
5. Check spark plug and spark of misfiring cylinder. PREPARATION: Remove the ignition coil (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). Remove the spark plug. CHECK: Check spark plug type. Check the electrode for carbon deposits. Check the electrode gap. OK: Recommended spark plug: SPARK PLUG RECOMMENDED Brand Part No. DENSO made K16TR11 NGK made BKR5EKB-11 No large carbon deposit present. Not wet with gasoline or oil. Correct electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.) PREPARATION: Install the spark plug to the ignition coil, and connect the ignition coil connector. Disconnect injector connector. Ground the spark plug. CHECK: Check if spark occurs while 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. OK: Spark jumps across electrode gap. OK: Go to step 10 . NG: Go to next step.
6. Change normal spark plug and check spark of misfiring cylinder. PREPARATION: Disconnect the spark plug. Replace the normal spark plug. Install the spark plug to the ignition coil, and connect the ignition coil connector. Disconnect the injector connector. Ground the spark plug. CHECK: Check if spark occurs while the engine is being cranked. NOTE: To prevent excess fuel from being injected from the injectors during this test, don't crank the engine for more than 5 to 10 seconds at a time. OK: Spark jumps across electrode gap. OK: Replace spark plug. NG: Go to next step.
7. Inspect high tension cords for misfiring cylinder (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). NG: Replace high tension cords. OK: Go to next step.
8. Inspect ignition coil for misfiring cylinder (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). NG: Replace ignition coil. OK: Go to next step.
9. Check for open and short in harness and connector between igniter and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
10. Check voltage of ECM terminal for injector of failed cylinder. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between applicable terminal of the ECM connector and body ground. OK: Voltage: 9 to 14V Reference: INSPECTION USING OSCILLOSCOPE With the engine idling, check the waveform between terminals #10 - #60 and E01 of the ECM connectors. HINT: The correct waveform is as shown. OK: Go to step 12 . NG: Go to next step.
11. Check resistance of injector of misfiring cylinder (See «INJECTOR»(ref-181795-S05748533512006080100000) ). NG: Replace injector. OK: Go to next step.
12. Check for open and short in harness and connector between ignition switch and injector, injector and ECM of misfiring cylinder (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
13. Check injector injection of misfiring cylinder (See «INJECTOR»(ref-181795-S05748533512006080100000) ). NG: Replace injector. OK: Go to next step.
14. Check compression pressure of misfiring cylinder (See «COMPRESSION (5VZ-FE)»(ref-181733) ). NG: Repair or replace. OK: Go to next step.
15. Check valve clearance of misfiring cylinder (See «VALVE CLEARANCE (5VZ-FE)»(ref-181734) ). NG: Adjust valve clearance. OK: Go to next step.
16. Switch the step by the number of misfire cylinder (Refer the result of Step 4 ). HIGH MISFIRE High Misfire Rate Cylinder Proceed to 1 or 2 cylinders Type I More than 3 cylinders Type II Type II: Check intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). Type I: Go to next step.
17. Check valve timing (Check for loose and jumping teeth of timing belt) (See «TIMING BELT (5VZ-FE)»(ref-181737) ). NG: Adjust valve timing (Repair or replace timing belt). OK: Go to next step.
18. Check fuel pressure (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). OK: Go to next step.
19. Check mass air flow meter (See «MASS AIR FLOW (MAF) METER»(ref-181795-S03314201312006080100000) ). NG: Repair mass air flow meter. OK: Go to next step.
20. Check engine coolant temperature sensor (See «INSPECTION»(ref-181795-S06199959392006080100000) ). NG: Replace engine coolant temperature sensor. OK: Go to next step.
21. Switch the step by the number of misfire cylinder (Refer the result of Step 4 ). HIGH MISFIRE High Misfire Rate Cylinder Proceed to 1 or 2 cylinders Type I More than 3 cylinders Type II Type II: Go to step 5 . Type I: Check intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).

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

Scheme 119

HINT

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

Scheme 120

Scheme 121

1. Connect hand-held tester or OBD II scan tool, and check knock sensor circuit. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC3. Disconnect the EE1 connector. Connect the terminals of the disconnected EE1 male connector and EE1 female as follows. CONNECTOR TEST CONNECTION Male connector Female connector Terminal 1 Terminal 2 Terminal 2 Terminal 1 Turn the ignition switch to ON and turn the hand-held tester or the OBD II scan tool main switch ON. After the engine is warmed up, perform quick racing to 4,000 RPM 3 times. CHECK: Check the DTC. RESULT: RESULT Condition Proceed To DTC same as when vehicle brought in P0325 --> P0325 or P0330 --> P0330 Type I DTC different to when vehicle brought in P0325 --> P0330 or P0330 --> P0325 Type II Reference: INSPECTION USING OSCILLOSCOPE With the engine racing (4,000 RPM), Check the waveform between terminals KNK1, KNK2 of the ECM connector and body ground. HINT: The correct waveform is as shown. Spread the time on the horizontal axis, and confirm that period of the wave is 0.141 m/sec. (Normal mode vibration frequency of knock sensor: 7.1 kHz) HINT: If normal mode vibration frequency is not 7.1 kHz, the sensor is malfunctions or ECM (terminal KNK1, 2). Type II: Go to step 3 . Type I: Go to next step.
2. Check for open and short in harness and connector between EE1 connector and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
3. Check for open and short in harness and connector between EE1 connector and knock sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). HINT: If DTC P0325 has changed to P0330 check the knock sensor circuit on the right bank side. If DTC P0330 has changed to P0325 check the knock sensor circuit on the left bank side. NG: Repair or replace harness or connector. OK: Replace knock sensor.

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

The NE signal plate has 34 teeth. The NE signal sensor generates 34 signals at every engine revolution.

The engine ECM detects the crankshaft angle and the engine speed based on the NE signals, and identify the cylinder on the G2 (Camshaft position sensor) and NE signals.

Scheme 122

HINT

1. Perform a troubleshooting of DTC P0335 first. If no trouble is found, troubleshoot the following mechanical systems.
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 123

1. Check resistance of crankshaft position sensor (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). Reference: INSPECTION USING OSCILLOSCOPE During cranking or idling, check the waveforms between terminals G2 and NE-, and NE+ and NE- of the ECM connector. HINT: The correct waveforms are as shown. NG: Replace crankshaft position sensor. OK: Go to next step.
2. Check for open and short in harness and connector between ECM and crankshaft position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
3. Inspect sensor installation and teeth of crankshaft timing pulley. NG: Tighten the sensor. Replace crankshaft timing pulley. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

The camshaft position sensor (G2 signal) consists of a magnet, iron core and pickup coil.

The G signal plate has 1 tooth on its outer circumference and is mounted on the RH camshaft timing pulley.

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

The NE signal plate has 34 teeth and is mounted on the crankshaft timing pulley. The NE signal sensor generates 34 signals at every engine revolution. The engine ECM detects the crankshaft angle and the engine speed based on the NE signals, and identify the cylinder on the G2 (Camshaft position sensor) and NE signals.

Scheme 124

HINT

1. DTC P0340 indicate a malfunction related to the camshaft position sensor (+) circuit. (Wire harness (ECM camshaft position sensor) and camshaft position sensor)
2. DTC P0341 indicate a malfunction related to the camshaft position sensor (-) circuit. (Wire harness (ECM camshaft position sensor) and camshaft position sensor)

HINT

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

1. Check resistance of camshaft position sensor (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). Reference: INSPECTION USING OSCILLOSCOPE Refer to DTC P0335 «DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT, DTC P0339 CRANKSHAFT POSITION SENSOR "A" CIRCUIT INTERMITTENT»(ref-181812-S18593004332005080500000) . NG: Replace camshaft position sensor. OK: Go to next step.
2. Check for open and short in harness and connector between ECM and camshaft position sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
3. Inspect sensor installation (See «CYLINDER HEAD (5VZ-FE)»(ref-181738) ) and tooth of RH camshaft timing pulley (See «TIMING BELT (5VZ-FE)»(ref-181737) ). NG: Tighten sensor. Replace RH camshaft timing pulley. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

There DTCs indicate a malfunction related to primary circuit.

A Direct Ignition System (DIS) has been adopted. The DIS improves the ignition timing accuracy, reduces high-voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor. The DIS is a 2-cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with one ignition coil. In the 2-cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark plugs. The sparks of the 2 spark plugs passes simultaneously from the center electrode to the ground electrode (No. 1, 5 and 3 cylinder) and from the ground electrode to the center electrode (No. 4, 2 and 6 cylinder). The ECM determines the ignition timing end outputs the ignition signal (IGT) for each cylinder. Based on the IGT signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time, the igniter also sends an ignition confirmation signal (IGF) as a fail-safe measure to the ECM.

Scheme 125

Scheme 126

Scheme 127

If the ECM does not receive the IGF after sending the IGT, it interprets this as a fault in the igniter and sets a DTC.

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 128

Scheme 129

Scheme 130

Scheme 131

Scheme 132

1. Check spark plug and spark of misfiring cylinder (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). NG: Go to step 4 . OK: Go to next step.
2. Check for open and short in harness and connector in IGF signal circuit between ECM and igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
3. Disconnect igniter connector and check voltage between terminal IGF of ECM connector and body ground. PREPARATION: Disconnect the igniter connector. Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminal IGF of the ECM connector and body ground. OK: Voltage: 4.5 to 5.5 V OK: Replace igniter. NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
4. Check for open and short in harness and connector in IGT1 - IGT3 signal circuit between ECM and igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
5. Disconnect igniter connector, and check voltage between terminals IGT1 - IGT3 of ECM connector and body ground. PREPARATION: Disconnect the igniter connector. Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminals IGT1 - IGT3 of the ECM connector and body ground when the engine is cranked. OK: Voltage: More than 0.1 V and less than 5.0 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
6. Check voltage between terminals IGT1 - IGT3 of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal IGT1 - IGT3 of the ECM connector and body ground when the engine is cranked. OK: Voltage: More than 0.1 V and less than 4.5 V Reference: INSPECTION USING OSCILLOSCOPE During idling, check the waveforms between terminals IGT1 - IGT3, and IGF and E1 of the ECM connector. HINT: The correct waveforms are as shown. NG: Go to step 9 . OK: Go to next step.
7. Check voltage between terminal 9 of igniter connector and body ground. PREPARATION: Disconnect the igniter connector. CHECK: Measure the voltage between terminal 9 of the igniter connector and body ground when the ignition switch is turned to ON and START positions. OK: Voltage: 9 to 14 V NG: Check and repair igniter power source circuit. OK: Go to next step.
8. Check for open and short in harness and connector between ignition switch and ignition coil, and ignition coil and igniter (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
9. Check ignition coil and spark plug resistive cord (See «IGNITION SYSTEM (5VZ-FE)»(ref-181836) ). NG: Replace ignition coil. OK: Replace igniter.

The ECM observes the waveform of the heated oxygen sensor located behind the catalyst to determine whether the catalyst is performance has deteriorated. If the catalyst is functioning normally, the waveform of the heated oxygen sensor located behind the catalyst switches back and forth between rich and lean much more slowly. When the waveform of the heated oxygen sensor located behind the catalyst alternates flatteringly between rich and lean, it indicates that catalyst performance has deteriorated.

Scheme 133

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 134

1. Are there any other codes (besides DTC P0420) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check gas leakage on exhaust system. NG: Repair or replace. OK: Go to next step.
3. Check A/F sensor (bank 1 sensor 1) (See «AIR-FUEL RATIO (A/F) SENSOR»(ref-181795-S18659291592006080100000) ). NG: Repair or replace. OK: Go to next step.
4. Check heated oxygen sensor (bank 1 sensor 2) (See «HEATED OXYGEN SENSOR»(ref-181795-S38966559602006080100000) ). NG: Repair or replace. OK: Replace front and rear three-way catalytic converter. HINT: Hand-held tester only: The narrowing down the trouble area is possible by performing ACTIVE TEST of the following "A/F CONTROL" (A/F sensor, heated oxygen sensor or another can be distinguished). Perform ACTIVE TEST by hand-held tester (A/F CONTROL). HINT: The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 25 %. Connect the hand-held tester to the DLC3 on the vehicle. Turn the ignition switch to ON. Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds. Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. Perform the A/F CONTROL operation with the engine in an idle condition (press the right or left button). Result: A/F sensor reacts in accordance with increase and decrease of injection volume: +25 % => rich output: Less than 3.0 V -12.5 % => lean output: More than 3.35 V Heated oxygen sensor reacts in accordance with increase and decrease of injection volume: +25 % => rich output: More than 0.55 V -12.5 % => lean output: Less than 0.4 V NOTE: The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about 20 seconds of delay at maximum The following A/F CONTROL procedure enables the technician to check and graph the voltage outputs of both the A/F sensor and the heated oxygen sensor. To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

1. When using the hand-held tester, follow the procedures under the title "Hand-held tester" (see «Hand-held tester»(ref-181812-S00415763552005092200000) ).
2. When using the OBD II scan tool, follow the procedures under the title "OBD II scan tool (excluding hand-held tester)" (see «OBD II scan tool (excluding hand-held tester)»(ref-181812-S01846092252005092200000) ).
3. Always troubleshoot DTCs P0441 (purge flow), P0446 (CCV), P0451, P0452 and P0453 (evaporative pressure sensor) before troubleshooting DTC P0442 or P0456.
4. Ask the customer if the following situations occurred. When the MIL illuminated, if the fuel tank cap was loose and if it was then tightened. When refueling, if the fuel tank cap was loose. If the fuel tank cap was loose, that is the why the DTC was stored. If the fuel cap was not loose or if the customer cannot remember, troubleshoot according to «Hand-held tester»(ref-181812-S00415763552005092200000) .
5. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
6. If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

DTC OUTPUT

HINT

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

Scheme 135

Scheme 136

Scheme 137

Scheme 138

Scheme 139

Scheme 140

Scheme 141

1. Read output DTC. PREPARATION: Connect the hand-held tester to the DLC3. CHECK: Read the output DTC. Troubleshoot the problems, according to the DTC output. B: Go to step 6 . C: Go to step 10 . A: Go to next step.
2. Check that fuel tank cap meets OEM specifications. NG: Replace fuel cap. OK: Go to next step.
3. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to next step.
4. Check fuel tank cap (See «INSPECTION»(ref-181793-S06085606322006083000000) ). NG: Replace fuel tank cap. OK: Go to next step.
5. Check filler neck for damage. PREPARATION: Remove the fuel tank cap. CHECK: Visually inspect the filler neck for damage. NG: Replace filler pipe. OK: Go to next step.
6. Check purge flow. PREPARATION: Connect the hand-held tester to the DLC3. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Disconnect the vacuum hose for the VSV for the EVAP from the charcoal canister. Start the engine. Select the item "EVAP (ALON)/ALL" in the ACTIVE TEST and operate EVAP VSV. CHECK: When the VSV for the EVAP is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: VSV is ON: Disconnected hose applies suction to your finger. VSV is OFF: Disconnected hose applies no suction to your finger. OK: Go to step 10 . NG: Go to next step.
7. Check vacuum hose between intake manifold 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. OK: Go to next step.
8. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-181795-S27928165242006080100000) ). NG: Replace EVAP VSV. OK: Go to next step.
9. Check for open and short in harness and connector between EFI relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
10. Check CCV. PREPARATION: Disconnect the vacuum hose for the VSV for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Select the item "INTAKE CTL VSV/ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. VSV OPERATION PROCEED VSV operation Output DTC Proceed to NG - A ..... P0446 output B OK P0446 does not output C B: Go to step 13 . C: Go to step 15 . A: Go to next step.
11. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-181795-S41532299762006080100000) ). PREPARATION: Disconnect the CCV connector. Apply the battery voltage to the CCV. CHECK: Check that air cannot flow freely. OK: When battery voltage is applied to the CCV, air cannot flow freely. NG: Replace CCV. OK: Go to next step.
12. Check for open and short in harness and connector between EFI relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
13. Check leakage for between CCV and canister. CHECK: Check that the CCV is correctly installed. Check the O-ring. NG: Repair or replace. OK: Go to next step.
14. Perform active test for CCV (Check that charcoal canister filter is not clogged). PREPARATION: Disconnect the vacuum hose for the VSV for the CCV from the charcoal canister. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the "ENHANCED OBD2/ACTIVE TEST" mode on the hand-held tester. Select the item "INTAKE CTL VSV/ALL" in the ACTIVE TEST and operate CCV. CHECK: Check the VSV operation when it is operated by the hand-held tester. OK: VSV is ON: Air does not flow from charcoal canister filter port to port F. VSV is OFF: Air from charcoal canister filter port flows out through port F. NG: Replace charcoal canister filter. OK: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
15. Check whether hose close to fuel tank have been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace. OK: Go to next step.
16. Check hoses and tube (purge line and EVAP line). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole and damage. NG: Repair or replace. OK: Go to next step.
17. Check hose between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe (See «INSPECTION»(ref-181793-S06085606322006083000000) ), 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. OK: Go to next step.
18. Check charcoal canister for cracks, hole and damage (See «INSPECTION»(ref-181793-S06085606322006083000000) ). NG: Repair or replace. OK: Go to next step.
19. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 - 5.5 V NG: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
20. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connector. Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Voltage: 2.9 - 3.7 V Voltage: 0.5 V or less OK: Go to step 22 . NG: Go to next step.
21. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.
22. Check fuel tank for cracks and damage. NG: Replace fuel tank. OK: It is likely that vehicle user did not properly close fuel tank cap. Please explain to customer how to properly install fuel tank cap.

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

Scheme 147

1. Check that fuel tank cap meets OEM specification. NG: Replace fuel cap. OK: Go to next step.
2. Check that fuel tank cap is correctly installed. NG: Correctly install fuel tank cap. OK: Go to next step.
3. Check fuel tank cap (See «INSPECTION»(ref-181793-S06085606322006083000000) ). 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 have been modified, and check whether there are signs of any accident near fuel tank or charcoal canister. CHECK: Check for cracks, deformation and loose connection of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: Repair or replace. OK: Go to next step.
6. Check hose between fuel tank and charcoal canister. CHECK: Check for proper connection of the fuel tank and fuel EVAP pipe (See «INSPECTION»(ref-181793-S06085606322006083000000) ), 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. OK: Go to next step.
7. Check VSV connector for EVAP, VSV connector for CCV and vapor pressure sensor connector for looseness and disconnection. NG: Repair or connect VSV or sensor connector. OK: Go to next step.
8. Check hoses and tube (purge line and EVAP line). CHECK: Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage and blockage. NG: Repair or replace. OK: Go to next step.
9. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 - 5.5 V NG: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
10. Check voltage between terminals PTNK and E2 of ECM connector. PREPARATION: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connector. 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). Voltage: 2.9 - 3.7 V Voltage: 0.5 V or less OK: Go to step 12 . NG: Go to next step.
11. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.
12. Check EVAP VSV. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal EVP1 of the ECM connector and body ground (ON). Disconnect between terminal EVP1 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 15 . NG: Go to next step.
13. Check operation of EVAP VSV (See «VSV FOR EVAPORATIVE EMISSION (EVAP)»(ref-181795-S27928165242006080100000) ). OK: Go to step 14. NG: Replace VSV and clean vacuum hoses between throttle body and EVAP VSV, and EVAP VSV and charcoal canister, and then check charcoal canister.
14. Check for open and short in harness and connector between EFI relay (Marking: EFI) and EVAP VSV, and EVAP VSV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
15. Check CCV. PREPARATION: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal CCV of the ECM connector and body ground (ON). Disconnect between terminal CCV of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from port E to port F. VSV is OFF: Air from port E flows out through port F. OK: Go to step 19 . NG: Go to next step.
16. Check charcoal canister filter (Check that charcoal canister filter is not clogged). PREPARATION: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Check the VSV function. Connect between terminal CCV of the ECM connector and body ground (ON). Disconnect between terminal CCV of the ECM connector and body ground (OFF). OK: VSV is ON: Air does not flow from charcoal canister filter port to port F. VSV is OFF: Air from charcoal canister filter port flows out through port F. NG: Replace charcoal canister filter. OK: Go to next step.
17. Check operation of CCV (See «VSV FOR CANISTER CLOSED VALVE (CCV)»(ref-181795-S41532299762006080100000) ). OK: Go to step 18. NG: Replace VSV and charcoal canister, and then check leakage for between charcoal canister and CCV.
18. Check for open and short in harness and connector between EFI relay (Marking: EFI) and CCV, and CCV and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Check and replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
19. Check the fuel tank over fill check valve (See «INSPECTION»(ref-181793-S06085606322006083000000) ). NG: Replace fuel tank over fill check valve or fuel tank. OK: Check and replace charcoal canister (See «INSPECTION»(ref-181793-S06085606322006083000000) ).

HINT

1. If DTC P0441 (Purge Flow), P0446 (CCV or VSV for Pressure switching valve), P0451 P0452 or P0453 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446, P0451. P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Read freeze frame data using the hand-held tester or the 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 EVAP VSV, charcoal canister and vapor pressure sensor.
4. If DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

Scheme 148

Scheme 149

1. Check voltage between terminals VC and E2 of ECM connector. CHECK: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
2. Check voltage between terminals PTNK and E2 of ECM connectors. PREPARATION: Remove the grove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals PTNK and E2 of the ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Using the MITYVAC (Hand-held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. Check the vapor pressure sensor output waveform using a hand-held tester. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). OK: Voltage: 2.9 to 3.7 V Voltage: 0.5 V or less A consecutive waveform presents OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
3. Check for open and short in harness and connector between vapor pressure sensor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace vapor pressure sensor.

The vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.

Scheme 150

Scheme 151

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 152

Scheme 153

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 «COMBINATION METER»(ref-182158) ). OK: Go to next step.
2. Check voltage between terminal SP1 of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Disconnect the E3 connector from the ECM. Shift the shift lever to the neutral. Jack up a rear wheel on one side. Turn the ignition switch to ON. CHECK: Measure the voltage between terminal SP1 of the ECM connector and body ground when the wheel is turned slowly. OK: Voltage is generated intermittently. NG: Check and repair harness and connector between combination meter and ECM. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

The idle speed is controlled by the Electric Throttle Control System (ETCS).

ETCS is composed of the throttle motor to operate the throttle valve, the magnetic clutch to connect the throttle motor with the throttle valve, the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position, the ECM to control the ETCS and the one valve type throttle body.

The ECM controls the throttle motor to make the throttle valve opening angle properly for the target idle speed.

Scheme 154

HINT

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

1. Are there any other codes (besides P0505) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check connection of PCV valve and hose. NG: Repair or replace PCV valve and hose. OK: Go to next step.
3. Check air induction system (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace. OK: Go to next step.
4. Check electric throttle control system (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle body assy (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for use by the DTC memory and air-fuel ratio adaptive control value memory, etc.

Scheme 155

HINT

If DTC P0560 is displayed, the ECM does not store another DTC.

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 156

1. Check voltage between terminal BATT of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal BATT of the ECM connector and the body ground. OK: Voltage: 9 to 14 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
2. Check EFI NO. 1 fuse. PREPARATION: Remove the EFI NO. 1 fuse. CHECK: Check the continuity of the EFI NO. 1 fuse. OK: Continuity NG: Check for short in all harness and components connected to EFI NO. 1 fuse. OK: Check and repair harness or connector between battery and EFI NO. 1 fuse, and EFI NO. 1 fuse and 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, and other data from the time the malfunction occurred.

1. Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

HINT

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

Hand-held tester

1. Connect hand-held tester, and check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG". CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: IGNITION SWITCH POSITION Ignition Switch Position ON START STA Signal OFF ON OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
2. Check ignition switch (See «IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch (Go to next step after the replacement). OK: Go to next step.
3. Connect hand-held tester, and check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG". CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: STA SIGNAL Ignition Switch Position ON START STA Signal OFF ON OK: System OK. NG: Go to next step.
4. Check park/neutral position (PNP) switch (A/T) (See «DTC P0705: TRANSMISSION RANGE SENSOR MALFUNCTION (PRNDL INPUT); DTC P0850: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181812-S23729905952005080500000) ) or clutch start switch (M/T) (See «CLUTCH»(ref-181827) ). NG: Replace park/neutral position switch or clutch start switch (Go to next step after the replacement). OK: Go to next step.
5. Connect hand-held tester, and check STA signal. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG". CHECK: Read the STA signal on the hand-held tester while the starter operates. OK: STA SIGNAL Ignition Switch Position ON START STA Signal OFF ON OK: System OK. NG: Check for short in harness and connector between ECM and park/neutral position (PNP) switch (A/T) (See «DTC P0705: TRANSMISSION RANGE SENSOR MALFUNCTION (PRNDL INPUT); DTC P0850: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181812-S23729905952005080500000) ) or clutch start switch (M/T) (See «CLUTCH»(ref-181827) ).

OBD II scan tool (excluding hand-held tester)

Scheme 157

Scheme 158

Scheme 159

1. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal STA of the ECM connector and the body ground, during the engine cranking (ignition switch START position) and does not engine cranking (ignition switch position ON). OK: Voltage: 6 V or more (ignition switch START position) 0 V (ignition switch ON position) OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
2. Check ignition switch (See «IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch (Go to next step after the replacement). OK: Go to next step.
3. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal STA of the ECM connector and the body ground, during the engine cranking (ignition switch START position) and does not engine cranking (ignition switch position ON). OK: Voltage: 6 V or more (ignition switch START position) 0 V (ignition switch ON position) OK: System OK. NG: Go to next step.
4. Check park/neutral position (PNP) switch (A/T) (See «DTC P0705: TRANSMISSION RANGE SENSOR MALFUNCTION (PRNDL INPUT); DTC P0850: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181812-S23729905952005080500000) ) or clutch start switch (M/T) (See «CLUTCH»(ref-181827) ). NG: Replace park/neutral position switch or clutch start switch (Go to next step after the replacement). OK: Go to next step.
5. Check voltage between terminal STA of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal STA of the ECM connector and the body ground, during the engine cranking (ignition switch START position) and does not engine cranking (ignition switch position ON). OK: Voltage: 6 V or more (ignition switch START position) 0 V (ignition switch ON position) OK: System OK. NG: Check for short in harness and connector between ECM and park/neutral position (PNP) switch (A/T) (See «DTC P0705: TRANSMISSION RANGE SENSOR MALFUNCTION (PRNDL INPUT); DTC P0850: PARK/NEUTRAL SWITCH INPUT CIRCUIT»(ref-181812-S23729905952005080500000) ) or clutch start switch (M/T) (See «CLUTCH»(ref-181827) ).

The park/neutral position switch go on when the shift lever is in the N or P shift position. When it goes on terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage becomes 0V. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off, so the voltage of ECM. Terminal NSW becomes battery voltage, the voltage of the ECM internal power source. If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction and for idle speed control (estimated control), etc.

Scheme 160

HINT

After confirming DTC P0705 and P0850 use the hand-held tester to confirm the PNP switch signal from the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/PNP SW [NSW]".

Refer to DTC P0705: TRANSMISSION RANGE SENSOR MALFUNCTION (PRNDL INPUT); DTC P0850: PARK/NEUTRAL SWITCH INPUT CIRCUIT .

This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut-off engine speed. (The fuel cut-off engine speed is reduced slightly when the vehicle is braking).

Scheme 161

Scheme 162

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 163

1. Check operation of stop light. CHECK: Check if the stop lights go on and off normally when the brake pedal is operated and released. NG: Check and repair stop light circuit and stop light switch (See «STOP LIGHT SYSTEM»(ref-182154) ). OK: Go to next step.
2. Check STP signal. When using hand-held tester: PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. CHECK: Read the STP signal on the hand-held tester. OK: STP SIGNAL Brake Pedal STP Signal Depressed ON Release OFF When not using Hand-held tester: PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Check the voltage between terminal STP of the ECM connector and body ground. OK: BREAK PEDAL VOLTAGE Brake Pedal Voltage Depressed 7.5 to 14 V Release Below 1.5 V OK: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). NG: Go to next step.
3. Check harness and connector between stop light switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

Magnetic clutch is mounted between the throttle motor and the valve, and it connects the throttle motor with the throttle valve.

Therefore, the throttle motor opens and closes the throttle valve through the magnetic clutch.

If the electric throttle control system has a malfunction, the magnetic clutch separates the throttle motor from the throttle valve in order not to operate the throttle valve by the throttle motor.

If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.

However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 164

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 165

1. Check magnetic clutch circuit. When using hand-held tester: PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and push the hand-held tester main switch ON. CHECK: Read the magnetic clutch current value on the hand-held tester. OK: Current: 0.8 to 1.0 A When not using hand-held tester: PREPARATION: Connect the oscilloscope between terminals CL+ and CL- of the ECM connector. Start the engine. CHECK: Check the waveform between terminals CL+ and CL- of the ECM connector when the engine is idling. OK: The correct waveform is as shown. NG: Go to step 4 . OK: Go to next step.
2. Check magnetic clutch (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle control motor with magnetic clutch (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
3. Check for open and short in harness and connector between magnetic clutch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace. OK: Go to next step.
4. Check operation of magnetic clutch. CHECK: Clear the DTC. Perform the following steps and check the DTC. Turn the ignition switch to ON. Start the engine. Turn the ignition switch to OFF and wait 3 seconds. Turn the ignition switch to ON. OK: DTC P1126 is not stored. NG: Replace throttle control motor with magnetic clutch (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

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 and it provides feedback to the ECM to control the throttle motor in order to the throttle valve opening angle properly in response to the driving condition.

If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.

However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 166

HINT

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

1. Check throttle control motor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle control motor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
2. Check for open and short in harness and connector between throttle control motor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace. OK: Go to next step.
3. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Visually 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 «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

Throttle motor is operated by the ECM and it opens and closes the throttle valve by a gear. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body and it provides feedback to the ECM to control the throttle motor in order the throttle valve opening angle properly in response to driving condition. If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring. However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 167

HINT

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

1. Visually check throttle valve. PREPARATION: Remove the intake air connector. CHECK: Check whether or not a foreign body is caught between the throttle valve and the housing. Also, check if the valve can open and close smoothly. NG: Remove a foreign body and clean throttle body. OK: Go to next step.
2. Check throttle control motor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle control motor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
3. Check for open and short in harness and connector between throttle control motor and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace, harness or connector. OK: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ).

Battery positive voltage is supplied to terminal +BM of the ECM even once when the ignition switch is OFF for the ETCS control system.

If this DTC is stored, the ECM shuts down the power for the ETCS motor and the magnetic clutch, and the ETCS valve is fully closed by the return spring.

However, the opening angle of the ETCS valve can be controlled by the accelerator pedal through the ETCS cable.

Scheme 168

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 169

1. Check ETCS fuse. PREPARATION: Remove the ETCS fuse. CHECK: Check the continuity of the ETCS fuse. OK: Continuity NG: Check for short in all harness and components connected to ETCS fuse. OK: Go to next step.
2. Check voltage between terminal +BM of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). CHECK: Measure the voltage between terminal +BM of the ECM connector and body ground. OK: Voltage: 9 to 14 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
3. Check harness and connector between battery and ETCS fuse, and ETCS fuse and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

The Electric Throttle Control System (ETCS) is composed of the throttle motor to operate the throttle valve, the electromagnetic clutch to connect the throttle motor with the throttle valve, the throttle position sensor to detect the opening angle of the throttle valve, the accelerator pedal position sensor to detect the accelerator pedal position, the ECM to control the ETCS and the one valve type throttle body.

The ECM controls the throttle motor to make the throttle valve opening angle properly in response driving condition.

The throttle position sensor which is mounted on the throttle body detects the opening angle of the throttle valve, and it provides feedback to the ECM to control the throttle motor.

If the ETCS has a malfunction, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.

However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 170

HINT

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

1. Are there any other codes (besides DTC P2119) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Check throttle body (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace throttle body (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
3. Replace ECM and Clear DTC (Check if DTC output recur). PREPARATION: Replace the ECM. Clear the DTC (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). Start and warm up the engine. Drive the engine at idle for 15 sec. or more. CHECK: Read the DTC using the hand-held tester or the OBD II scan tool. OK: Standard: No DTC output OK: System is OK. NG: Replace throttle body (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ).

The Accelerator pedal position sensor is mounted on the throttle body and it has the 2 sensors to detects the accelerator position and a malfunction of the accelerator position's own.

The accelerator pedal position sensor is connected with the accelerator pedal by the accelerator wire and the voltage applied to the terminals VPA and VPA2 of the ECM changes between 0 V and 5 V in proportion to the opening angle of the accelerator pedal. The VPA is a signal to indicate the actual accelerator pedal opening angle which is used for the engine control, and the VPA2 is a signal to indicate the information about the opening angle which is used for detecting a malfunction.

The ECM judges the current opening angle of the accelerator pedal from these signals input from terminals VPA and VPA2 and the ECM controls the throttle motor based on these signals.

If this DTC is stored, the ECM shuts down the power for the throttle motor and the magnetic clutch, and the throttle valve is fully closed by the return spring.

However, the opening angle of the throttle valve can be controlled by the accelerator pedal through the throttle cable.

Scheme 171

Scheme 172

HINT

After confirming DTC P2120, P2122, P2123, P2125, P2127, P2128 and P2138 use the hand-held tester or the OBD II scan tool to confirm the throttle valve opening percentage.

Scheme 173

HINT

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

Hand-held tester

Scheme 174

Scheme 175

Scheme 176

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 to ON and turn the hand-held tester main switch ON. CHECK: Read the voltage for the accelerator pedal position sensor data. OK: PEDAL VOLTAGE Accelerator Pedal VPA VPA2 Released 0.3 to 0.9 V 1.8 to 2.7 V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
2. Check accelerator pedal position sensor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace accelerator pedal position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
3. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
4. Check voltage between terminals VPA and E2, and VPA2 and E2 of ECM connectors. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VPA and E2, and VPA2 and E2 of the ECM connectors. OK: VOLTAGE Accelerator pedal VPA - E2 VPA2 - E2 Released 0.3 to 0.9 V 1.8 to 2.7 V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
5. Check for open and short in harness and connector in VC VPA, VPA2 and E2 circuits between ECM and accelerator pedal sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 177

Scheme 178

1. Check accelerator pedal position sensor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace accelerator pedal position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
2. Check voltage between terminals VC and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VC and E2 of the ECM connector. OK: Voltage: 4.5 to 5.5 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
3. Check voltage between terminals VPA and E2, and VPA2 and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VPA and E2, and VPA2 and E2 of the ECM connectors. OK: ACCELERATOR PEDAL VOLTAGE Accelerator pedal VPA - E2 VPA2 - E2 Released 0.3 to 0.9 V 1.8 to 2.7 V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
4. Check for open and short in harness and connector in VC VPA, VPA2 and E2 circuits between ECM and accelerator pedal sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

HINT

This is repair procedure of "accelerator pedal position sensor".

Refer to DTC P2120 DTC P2120 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT, DTC P2122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT LOW INPUT, DTC P2123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT HIGH INPUT, DTC P2125 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT, DTC P2127 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT LOW INPUT, DTC P2128 THROTTLE/PEDAL POSITION SENSOR/SWITCH "E" CIRCUIT HIGH INPUT, DTC P2138 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D"/"E" VOLTAGE CORRELATION .

CIRCUIT DESCRIPTION (DTC P2121)

HINT

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

Scheme 179

1. Check accelerator pedal position sensor (See «THROTTLE BODY»(ref-181795-S37116747182006080100000) ). NG: Replace accelerator pedal position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ). OK: Go to next step.
2. Check voltage between terminals VPA and E2, and VPA2 and E2 of ECM connector. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminals VPA and E2, and VPA2 and E2 of the ECM connectors. OK: TERMINAL VOLTAGE MEASURING Accelerator pedal VPA - E2 VPA2 - E2 Released 0.3 to 0.9 V 1.8 to 2.7 V Depressed 3.2 to 4.8 V 4.7 to 5.1 V OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Go to next step.
3. Check for open and short in harness and connector in VC VPA, VPA2 and E2 circuits between ECM and accelerator pedal sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace accelerator pedal position sensor (See «REPLACEMENT»(ref-181795-S13057012632006080100000) ).

HINT

This DTC is related to A/F sensor, although the caption is oxygen sensor.

To obtain a high purification rate of the CO, HC and NOx components of the exhaust gas, a three-way catalytic converter is used. But, for the most efficient use of the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.

The A/F sensor has a characteristic that the output voltage * becomes approximately proportional to the existing air-fuel ratio. The A/F sensor output voltage * is used to provide feedback for the ECM to control the air-fuel ratio. By the A/F sensor output, the ECM can determine the deviation amount from the stoichiometric air-fuel ratio and control the proper injection time immediately. If the A/F sensor malfunctions, the ECM is unable to perform the accurate air-fuel ratio control. The A/F sensor is equipped with a heater which heats the zirconia element. The heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is low), the current flows to the heater to heat the sensor for the accurate oxygen concentration detection.

* : The voltage value changes at the inside of the ECM only.

Scheme 180

Scheme 181

HINT

1. After confirming DTC P2195 and P2196, use the hand-held tester or the OBD II scan tool to confirm an output voltage of the A/F sensor (AFS B1 S1) from the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL".
2. The A/F sensor's output voltage and the short-term fuel value can be read using the OBD II scan tool or hand-held tester.
3. The ECM controls the voltage of AF1+ and AF1- terminals of ECM to the fixed voltage. Therefore, it is impossible to confirm the A/F sensor output voltage without the hand-held tester or the OBD II scan tool.
4. OBD II scan tool (excluding hand-held tester) displays the one fifth of the A/F sensor output voltage which is displayed on the hand-held tester.

HINT

Hand-held tester only

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

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

HINT

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

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

Result

A/F sensor reacts in accordance with increase and decrease of injection volume

+25 % => rich output: Less than 3.0 V

12.5 % => lean output: More than 3.35 V

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

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

12.5 % => lean output: Less than 0.4 V

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

Scheme 182

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

To display the graph, enter ACTIVE TEST / A/F CONTROL / USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

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

Scheme 183

Scheme 184

Scheme 185

1. Are there any other codes (besides A/F sensor circuit DTC codes) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Connect hand-held tester or OBD II scan tool, and read value for voltage output of A/F sensor (bank 1 sensor 1). PREPARATION: Connect the OBD II scan tool or the hand-held tester to the DLC 3. Warm up the A/F sensor (bank 1 sensor 1) with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the OBD II scan tool or hand-held tester. CHECK: Hand-held tester only: Select the "DIAGNOSIS/ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow engine to idle for 30 seconds. Engine is racing at approx. 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully closed quickly. OK: Standard: Condition (1) and (2) Voltage change a little in the vicinity of 3.3 V (0.66 V) * (between approx. 3.1 to 3.5 V) as shown in the figure. Condition (3) A/F ratio sensor voltage increase to 3.8 V (0.76 V) * or more during engine deceleration (when fuel cut) as shown in the figure. HINT: Whenever the output voltage of the A/F sensor remains at approx. 3.3 V (0.660 V) * (see Malfunction Condition in (Scheme 183) ) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approx. 3.8 V (0.76 V) * or more, or 2.8 V (0.56 V) * or less (see Malfunction Condition in (Scheme 183) ) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V) * during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F ratio sensor or ECM, you can obtain a constant voltage. *: When using the OBD II scan tool (excluding hand-held tester). OK: Go to step 13 NG: Go to next step.
3. Check resistance of A/F sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4 ohm; at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
4. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: EFI RELAY CONDITION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
5. Check for open and short in harness and connector between ECM and A/F sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
6. Check air induction system (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace. OK: Go to next step.
7. Check fuel pressure (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). CHECK: Check fuel pressure (high or low fuel pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). OK: Go to next step.
8. Check injector injection (See «INJECTOR»(ref-181795-S05748533512006080100000) ). CHECK: Check injector injection (high or low fuel injection quantity or poor injection pattern). NG: Replace injector. OK: Go to next step.
9. Replace A/F sensor. Go to next step..
10. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
11. Are there A/F sensor circuit DTC codes being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. NO: Go to next step.
12. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: A/F sensor circuit DTC codes are caused by shortage of fuel.
13. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
14. Are there A/F sensor circuit DTC codes being output again? NO: Go to step 18 YES: Go to next step.
15. Replace A/F sensor. Go to next step.
16. Perform confirmation driving pattern. HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
17. Are there A/F sensor circuit DTC codes being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NO: Go to next step.
18. Did vehicle run out of fuel in the past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: A/F sensor circuit DTC codes is caused by shortage of fuel.

HINT

This DTC is related to A/F sensor, although the caption is oxygen sensor.

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

Scheme 186

HINT

Hand-held tester only

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

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

HINT

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

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

Result

A/F sensor reacts in accordance with increase and decrease of injection volume

+25 % => rich output: Less than 3.0 V

12.5 % => lean output: More than 3.35 V

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

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

12.5 % => lean output: Less than 0.4 V

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

Scheme 187

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

To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

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

Scheme 188

Scheme 189

1. Check resistance of A/F sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4 ohm at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
2. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: EFI RELAY CONDITION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
3. Check for open and short in harness and connector between ECM and A/F sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace A/F sensor.

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

Scheme 190

Scheme 191

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

HINT

Hand-held tester only

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

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

HINT

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

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

Result

A/F sensor reacts in accordance with increase and decrease of injection volume

+25 % => rich output: Less than 3.0 V

12.5 % => lean output: More than 3.35 V

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

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

12.5 % => lean output: Less than 0.4 V

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

Scheme 192

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

To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.

HINT

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

Scheme 193

Scheme 194

Scheme 195

1. Are there any other codes (besides DTC P2A00) being output? YES: Go to relevant DTC chart (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-181812-S02039846342005080500000) ). NO: Go to next step.
2. Connect hand-held tester or OBD II scan tool, and read value for voltage output of A/F sensor. PREPARATION: Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensor (bank 1 sensor 1) with the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage on the hand-held tester or the OBD II scan tool. CHECK: Hand-held tester only: Select the "DIAGNOSIS/ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage under the condition as follows. Allow engine to idle for 30 seconds. Engine is racing at approx. 2,500 RPM (when engine revolution is not suddenly changed). Raise the engine speed to 4,000 RPM and release the accelerator pedal fully closed quickly. OK: Standard: Condition (1) and (2) Voltage change a little in the vicinity of 3.3 V (0.66 V)* (between approx. 3.1 to 3.5 V) as shown in the figure. Condition (3) A/F ratio sensor voltage increase to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the figure HINT: Whenever the output voltage of the A/F sensor remains at approx. 3.3 V (0.660 V)* (see Malfunction Condition in (Scheme 193) ) under any conditions as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approx. 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see Malfunction Condition in (Scheme 193) ) under any conditions as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F ratio sensor voltage. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to relearn the closed throttle position. When the vehicle is driven: In the case that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor are functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F ratio sensor or ECM, you can obtain a constant voltage. *: When using the OBD II scan tool (excluding hand-held tester). OK: Go to step 14 NG: Go to next step.
3. Check resistance of A/F sensor heater. PREPARATION: Disconnect the sensor connector. CHECK: Using an ohmmeter, measure the resistance between terminals +B and HT. OK: RESISTANCE CHECK Temperature Resistance at 20°C (68°F) 0.8 to 1.4 ohm at 800°C (1,472°F) 1.8 to 3.2 ohm NG: Replace A/F sensor. OK: Go to next step.
4. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: EFI RELAY TESTER SPECIFICATION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
5. Check for open and short in harness and connector between ECM and A/F sensor (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
6. Check air induction system (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). CHECK: Check for vacuum leaks in air induction system. NG: Repair or replace. OK: Go to next step.
7. Check connection of PCV hose. NG: Repair or replace PCV hose. OK: Go to next step.
8. Check fuel pressure (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). CHECK: Check fuel pressure (high or low fuel pressure). NG: Check and repair fuel pump, pressure regulator, fuel pipe line and filter (See «PRECAUTION»(ref-181795-S34470276282005080400000) ). OK: Go to next step.
9. Check injector injection (See «INJECTOR»(ref-181795-S05748533512006080100000) ). CHECK: Check injector injection (high or low fuel injection quantity or poor injection pattern). NG: Replace injector. OK: Go to next step.
10. Replace A/F sensor. Go to next step.
11. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
12. Is there DTC P2A00 being output again? YES: Replace ECM. See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern (See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). NO: Go to next step
13. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P2A00 is caused by shortage of fuel.
14. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go
15. Is there DTC P2A00 being output again? NO: Go to step 19 YES: Go to next step.
16. Replace A/F sensor. Go to next step.
17. Perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). HINT: Clear all DTCs prior to performing the confirmation driving pattern. Go to next step.
18. Is there DTC P2A00 being output again? YES: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ) and perform confirmation driving pattern. See «DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1)»(ref-181812-S10428389802005080500000). NO: Go to next step
19. Did vehicle run out of fuel in past? NO: Check for intermittent problems (See «PRE-CHECK»(ref-181812-S42723497822005080500000) ). YES: DTC P2A00 is caused by shortage of fuel.

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

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

Scheme 196

Scheme 197

Scheme 198

Scheme 199

Scheme 200

1. Check voltage between terminals +B and E1 or ECM connectors. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). 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»(ref-181812-S21115412142005080500000). NG: Go to next step
2. Check for open in harness and connector between terminal E1 of ECM connector and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
3. Check voltage between terminal IGSW of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal IGSW of the ECM connector and the 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. CHECK: Check the continuity of the IGN fuse. OK: Continuity NG: Check for short in all harness and components connected to IGN fuse (Scheme 196) OK: Go to next step.
5. Check ignition switch (See «IGNITION SWITCH & KEY UNLOCK WARNING SYSTEM»(ref-182147) ). NG: Replace ignition switch. OK: Check and repair harness and connector between battery and ignition switch, and ignition switch and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).
6. Check voltage between terminal MREL of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch ON. CHECK: Measure the voltage between terminal MREL of the ECM connector and the body ground. OK: Voltage: 9 to 14 V NG: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). OK: Go to next step.
7. Check EFI NO. 1 fuse (See «DTC P0560 SYSTEM VOLTAGE»(ref-181812-S41568245792005080500000), step 2). NG: Check for short in all harness and components connected to EFI NO. 1 fuse (Scheme 196) OK: Go to next step.
8. Check EFI relay (Marking: EFI). PREPARATION: Remove the EFI relay. CHECK: Inspect the EFI relay. OK: EFI RELAY TESTER SPECIFICATION Condition Tester connection Specified condition Constant 1 - 2 Continuity Constant 3 - 5 No continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity NG: Replace EFI relay. OK: Go to next step.
9. Check for open and short in harness and connector between terminal MREL of ECM and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or harness or connector. OK: Check and repair harness or connector between EFI NO. 1 fuse and battery.

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

When the STA signal and NE signal are input to the ECM, Tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates. While the NE signal is generated (engine running), the ECM keeps Tr on (circuit opening relay on) and the fuel pump also keeps operating.

Scheme 201

Scheme 202

Hand-held tester

Scheme 203

Scheme 204

1. Check operation of fuel pump. PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/FUEL PUMP/SPD". CHECK: Check for the fuel pressure in the fuel inlet hose when it is pinched by hand. OK: There is pressure in the fuel inlet hose. HINT: At this time, you will hear a fuel flowing noise. OK: Proceed to next circuit inspection shown on «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000) . NG: Go to next step.
2. Check fuel pump (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). NG: Replace fuel pump. OK: Go to next step.
3. Check circuit opening relay (See «CIRCUIT OPENING RELAY»(ref-181795-S24910129812006080100000) ). NG: Replace circuit opening relay. OK: Go to next step.
4. Check for open in harness and connector between circuit opening relay and fuel pump, and fuel pump and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
5. Check voltage between terminal FC of ECM and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminal FC of the ECM connector and the body ground. OK: Voltage: 9 to 14 V OK: Proceed to next circuit inspection shown on «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000) . NG: Go to next step.
6. Check for open in harness and connector between circuit opening relay and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).

OBD II scan tool (excluding hand-held tester)

Scheme 205

Scheme 206

1. Check operation of fuel pump. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Connect terminal FC of the ECM connector and the body ground. Check for the fuel pressure in the inlet hose when it is pinched by hand. OK: There is pressure in the fuel inlet hose. HINT: At this time, you will hear a fuel flowing noise. OK: Proceed to next circuit inspection shown on «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000) . NG: Go to next step.
2. Check fuel pump (See «FUEL PUMP»(ref-181795-S34907562362006080100000) ). NG: Replace fuel pump. OK: Go to next step.
3. Check circuit opening relay (See «CIRCUIT OPENING RELAY»(ref-181795-S24910129812006080100000) ). NG: Replace circuit opening relay. OK: Go to next step.
4. Check for open in harness and connector between circuit opening relay and fuel pump, and fuel pump and body ground (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Go to next step.
5. Check voltage between terminal FC of ECM connector and body ground. PREPARATION: Remove the glove compartment (See «ENGINE CONTROL MODULE (ECM)»(ref-181795-S34113173392006080100000) ). Turn the ignition switch to ON. CHECK: Measure the voltage between terminal FC of the ECM connector and the body ground. OK: Voltage: 9 to 14 V OK: Proceed to next circuit inspection shown on «PROBLEM SYMPTOMS TABLE»(ref-181812-S21115412142005080500000) . NG: Go to next step.
6. Check for open in harness and connector between circuit opening relay and ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ). NG: Repair or replace harness or connector. OK: Replace ECM (See «HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE»(ref-181807-S35860315572005080400000) ).