Sfi System: Diagnosis Scion xB I

HOW TO PROCEED WITH TROUBLESHOOTING

The hand-held tester can be used in steps 3 , 4 , 5 , 7 and 10 .

1. VEHICLE BROUGHT TO WORKSHOP GO TO NEXT STEP
2. CUSTOMER PROBLEM ANALYSIS (See «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-224516-S18932445872006031000000) ) GO TO NEXT STEP
3. CONNECT HAND-HELD TESTER TO DLC3 HINT: If the display indicates a communication fault in the tester, inspect the DLC3. GO TO NEXT STEP
4. CHECK DTC AND FREEZE FRAME DATA (See «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ) HINT: Record or print DTCs and freeze frame data, if necessary. GO TO NEXT STEP
5. CLEAR DTC AND FREEZE FRAME DATA (See «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ) GO TO NEXT STEP
6. CONDUCT VISUAL INSPECTION GO TO NEXT STEP
7. SET CHECK MODE DIAGNOSIS (See «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ) GO TO NEXT STEP
8. CONFIRM PROBLEM SYMPTOMS HINT: If the engine does not start, perform steps 10 and 12 first. PROBLEM SYMPTOMS MALFUNCTION RESULT REFERENCE Result Proceed To Malfunction does not occur A Malfunction occurs B B: GO TO STEP 10 . A: GO TO NEXT STEP
9. SIMULATE SYMPTOM GO TO NEXT STEP
10. 10 CHECK DTC (See «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ) DTC CHECK/CLEAR MALFUNCTION RESULT REFERENCE Result Proceed To Malfunction code A No code B B: GO TO STEP 12 . A: GO TO NEXT STEP
11. REFER TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) GO TO STEP 14 .
12. CONDUCT BASIC INSPECTION (See «BASIC INSPECTION»(ref-224516-S19571451182006031000000) ) BASIC INSPECTION MALFUNCTION RESULT REFERENCE Result Proceed To Malfunctioning parts not confirmed A Malfunctioning parts confirmed B B: GO TO STEP 17 . A: GO TO NEXT STEP
13. REFER TO PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000) ) PROBLEM SYMPTOMS MALFUNCTION RESULT REFERENCE Result Proceed To Malfunctioning circuit confirmed A Malfunctioning parts confirmed B B: GO TO STEP 17 . A: GO TO NEXT STEP
14. 14 CHECK ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-224516-S01199847272006031000000) ) GO TO NEXT STEP
15. CONDUCT CIRCUIT INSPECTION CONDUCT CIRCUIT MALFUNCTION RESULT REFERENCE Result Proceed To Malfunction not confirmed A Malfunction confirmed B B: GO TO STEP 18 . A: GO TO NEXT STEP
16. CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) GO TO STEP 18 .
17. CONDUCT PARTS INSPECTION GO TO NEXT STEP
18. 18 IDENTIFY PROBLEM GO TO NEXT STEP
19. ADJUST AND/OR REPAIR GO TO NEXT STEP
20. CONDUCT CONFIRMATION TEST END

Scheme 10

BASIC INSPECTION

When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location of the problem can be found quickly and efficiently. Therefore, using this check is essential when engine troubleshooting.

1. CHECK BATTERY VOLTAGE NOTE: Carry out this check with the engine stopped and ignition switch OFF. BATTERY VOLTAGE MALFUNCTION RESULT REFERENCE Result Proceed To 11 V or more OK Below 11 V NG NG: CHARGE OR REPLACE BATTERY OK: Go to next step.
2. CHECK WHETHER ENGINE WILL CRANK NG: PROCEED TO PROBLEM SYMPTOMS TABLE ON PAGE 05-32 «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000) OK: Go to next step.
3. CHECK WHETHER ENGINE STARTS NG: GO TO STEP 6 . OK: Go to next step.
4. CHECK AIR FILTER Visually check that the air filter is not excessively contaminated with dirt or oil. NG: REPLACE AIR FILTER OK: Go to next step.
5. CHECK IDLING SPEED (See «ENGINE»(ref-224535-S01176598232006031000000) ) NG: PROCEED TO «ENGINE»(ref-224535-S01176598232006031000000) AND CONTINUE TROUBLESHOOTING OK: PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000)
6. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) NG: PROCEED TO «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) AND CONTINUE TROUBLESHOOTING OK: Go to next step.
7. CHECK FOR SPARK (See «IGNITION SYSTEM»(ref-224544-S07471355602006031000000) ) NG: PROCEED TO «IGNITION SYSTEM»(ref-224544-S07471355602006031000000) AND CONTINUE TROUBLESHOOTING OK: PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000)

PROBLEM SYMPTOMS TABLE

HINT

When a malfunction is not confirmed by a DTC (Diagnostic Trouble Code) check and the cause of problem cannot be identified through a basic inspection, troubleshoot according to the priority order indicated in the table below.

Scheme 11

Scheme 12

HINT

The standard normal voltage between each pair of ECM terminals is (Scheme 13)or (Scheme 14). The appropriate conditions for checking each pair of terminals is also indicated.

The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the STD Voltage column.

The illustration above can be used as a reference to identify the ECM terminal locations.

Scheme 13

Scheme 14

WAVEFORM 1

Airbag sensor assembly

WAVEFORM 1 REFERENCE

Scheme 15

WAVEFORM 2

Vehicle speed signal

WAVEFORM 2 REFERENCE

HINT

The wavelength becomes shorter as the vehicle speed increases.

Scheme 16

WAVEFORM 3

Engine speed signal

WAVEFORM 3 REFERENCE

HINT

The wavelength becomes shorter as the engine rpm increases.

Scheme 17

WAVEFORM 4

EVAP VSV

WAVEFORM 4 REFERENCE

HINT

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

Scheme 18

WAVEFORM 5

Heated Oxygen (HO2) sensor (sensor 1)

WAVEFORM 5 REFERENCE

HINT

In the DATA LIST, item O2S B1S1 shows the ECM input values from the front HO2 sensor (sensor 1).

Scheme 19

WAVEFORM 6

Heated Oxygen (HO2) sensor (sensor 2)

WAVEFORM 6 REFERENCE

HINT

In the DATA LIST, item O2S B1S2 shows the ECM input values from the front HO2 sensor (sensor 2).

Scheme 20

WAVEFORM 7

1. Camshaft position sensor
2. Crankshaft position sensor

Scheme 21

HINT

The wavelength becomes shorter as the engine rpm increases.

Scheme 22

WAVEFORM 8

Fuel injector

WAVEFORM 8 REFERENCE

HINT

The wavelength becomes shorter as the engine rpm increases.

Scheme 23

WAVEFORM 9

1. Igniter IGT signal (from ECM to igniter)
2. Igniter IGF signal (from igniter to ECM)

Scheme 24

HINT

The wavelength becomes shorter as the engine rpm increases.

Scheme 25

WAVEFORM 10

Camshaft timing oil control valve (OCV)

WAVEFORM 10 REFERENCE

HINT

The wavelength becomes shorter as the engine rpm increases.

Scheme 26

WAVEFORM 11

Knock sensor

WAVEFORM 11 REFERENCE

HINT

1. The wavelength becomes shorter as the engine rpm increases.
2. The waveforms and amplitudes displayed differ slightly depending on the vehicle.

Scheme 27

WAVEFORM 12

Terminal SIL of DLC3

WAVEFORM 12 REFERENCE

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

1. DESCRIPTION When troubleshooting OBD II (On-Board Diagnostics) vehicles, a hand-held tester or OBD II scan tool (complying with SAE J1987) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle's ECM (Engine Control Module) can be then read. OBD II regulations require that the vehicle's on-board computer illuminates the MIL (Malfunction Indicator Lamp) on the instrument panel when the computer detects a malfunction in: The emission control systems and components The power train control components (which affect vehicle emissions) The computer itself In addition, the applicable DTCs (Diagnostic Trouble Codes) prescribed by SAE J2012 are recorded on 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory (see «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ). To check DTCs, connect a hand-held tester or OBD II scan tool to the DLC3. The tester and scan tool display DTCs, freeze frame data, and a variety of engine data. The DTCs and freeze frame data can be erased with the tester and scan tool (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ).
2. NORMAL MODE AND CHECK MODE The diagnosis system operates in the normal mode during normal vehicle use. In normal mode, 2 trip detection logic is used to ensure accurate detection of malfunctions. Check mode is also available as an option for technicians. In check mode, 1 trip detection logic is used for simulating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (hand-held tester only) (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ).
3. TRIP DETECTION LOGIC When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the next subsequent drive cycle, the MIL is illuminated (2nd trip).
4. FREEZE FRAME DATA Freeze frame data record the engine condition (fuel system, calculated engine load, engine coolant temperature, fuel trim, engine speed, vehicle speed, etc) when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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.
5. DLC3 (Data Link Connector 3) 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. REFERENCE TERMINALS Symbols Terminal No. Names Reference terminals Results Conditions SIL 7 Bus "+" line 5 - Signal ground Pulse generation During transmission CG 4 Chassis ground Body ground 1 ohms or less Always SG 5 Signal ground Body ground 1 ohms or less Always BAT 16 Battery positive Body ground 9 to 14 V Always HINT: The DLC3 is the interface prepared for reading various data from the vehicle's ECM. After connecting the cable of a hand-held tester or OBD II scan tool, turn the ignition switch to ON and turn the tester or scan tool ON. If a communication failure message is displayed on the tester or scan tool screen (on the tester: UNABLE TO CONNECT TO VEHICLE), a problem exists in either the vehicle or tester. In order to identify the location of the problem, connect the tester to another vehicle. If communication is normal: Inspect the DLC3 on the original vehicle. If communication is impossible: The problem is probably with the tester itself. Consult the Service Department listed in the instruction manual.
6. BATTERY VOLTAGE Battery Voltage: 11 to 14 V If the voltage is below 11 V, recharge the battery before proceeding.
7. MIL (Malfunction Indicator Lamp) The MIL is illuminated when the ignition switch is first turned to ON (the engine is not running). The MIL should turn off when the engine is started. If the MiL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system. HINT: If the MIL is not illuminated when the ignition switch is first turned to ON, check the MIL circuit (see «MIL CIRCUIT»(ref-224516-S01030247552006031000000) ).

DTC CHECK/CLEAR

Note. Hand-held tester only: 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 are erased. Before changing modes, always check and make a note of DTCs and freeze frame data.

HINT

1. DTCs which are stored in the ECM can be displayed on a hand-held tester or OBD II scan tool. A hand-held tester can display current and pending DTCs.
2. Some DTCs are not set if the ECM does not detect the same malfunction again during a second consecutive driving cycle. However, such malfunctions, detected on only one occasion, are stored as pending DTCs.

Scheme 33

1. CHECK DTC (Using a hand-held tester or OBD II scan tool) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. If using an OBD II scan tool, refer to the instruction manual . Check the DTC(s) and freeze frame data, and then write them down. See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) to check the details of the DTC(s). HINT: When simulating a symptom with an OBD II scan tool to check DTCs in the DIAGNOSTIC TROUBLE CODE CHART, subject to 2 trip detection logic, conduct either of the following operations. (For more information, refer to the scan tool instruction-manual .) Check pending DTCs using the Continuous Test Result function (Mode 07 for SAE J1979). Simulate the symptom again after turning the ignition switch to OFF upon finishing the first symptom simulation, so that the MIL is illuminated and the DTC(s) is stored in the ECM.
2. CLEAR DTC (Using the hand-held tester or OBD II scan tool) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or the scan tool ON. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CLEAR CODES. Press the YES button. If using an OBD II scan tool, refer to the instruction manual.
3. CLEAR DTC (Without using a hand-held tester or OBD II scan tool) Perform either one of the following operations. Disconnect the negative battery cable for more than 1 minute. Remove the EFI and ETCS fuses from the Relay Block (R/B) located inside the engine compartment for more than 1 minute. NOTE: When disconnecting the battery cable, perform the INITIALIZE procedure.

DIAGNOSTIC TROUBLE CODE CHART

HINT

The parameters listed in the chart are for reference only. Factors such as instrument type may cause readings to differ slightly from stated values.

If any DTCs are displayed during a check mode DTC check, check the circuit for the DTCs listed in (Scheme 34), (Scheme 35), (Scheme 36), (Scheme 37), (Scheme 38) and (Scheme 39). For details of each DTC, refer to the page indicated.

*: MIL flashes when a catalyst damaged misfire is detected.

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

DTC INDEX

INSPECTION PROCEDURE

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 40

Scheme 41

1. PERFORM ACTIVE TEST USING HAND-HELD TESTER(OPERATE OCV) Connect a hand-held tester to the DLC3. Start the engine and turn the tester ON. Warm up the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1. Check the engine speed while operating the Oil Control Valve (OCV) using the tester. OK: OPERATE OCV Tester Operations Specified Conditions OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON) NG: Go to step 2 OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) )
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OCV SIGNAL) Disconnect the C2 OCV connector. While idling, check the waveform between the terminals of the C2 OCV connector using an oscilloscope. Standard: SPECIFIED CONDITIONS CHART Tester Connections Specified Conditions OCV+ (C2-1) - OCV- (C2-2) Correct waveform (Scheme 40)Reconnect the OCV connector. NG: Go to step 3. OK: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY
3. INSPECT ECM (OCV SIGNAL) Inspect the ECM using an oscilloscope. While idling, check the waveform between the terminals of the E5 ECM connector. Standard: SPECIFIED CONDITIONS CHART Tester Connections Specified Conditions OCV+ (E5-15) - OCV- (E5-14) Correct waveform (Scheme 41)NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

OBDII scan tool (excluding hand-held tester)

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OPERATE OCV) Disconnect the C2 Oil Control Valve (OCV) connector. Apply positive battery voltage between the terminals of the OCV. Check the engine speed. OK: Rough idling, or the engine stalls. Reconnect the OCV connector. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY OK: Go to next step.
2. INSPECT ECM (OCV SIGNAL) Inspect the ECM using an oscilloscope. During idling, check the waveform between the terminals of the E3 ECM connector. Standard: SPECIFIED CONDITIONS CHART Tester Connections Specified Conditions OCV+ (E5-15) - OCV- (E5-14) Correct waveform (Scheme 43)NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR(CAMSHAFT TIMING OIL CONTROL VALVE (OCV) - ECM) Disconnect the C2 OCV connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): Standard (Check for short): Reconnect the OCV connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) )

Note. DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 48

Scheme 49

Scheme 50

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0011 OR P0012) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DISPLAY (DTC OUTPUT) Display (DTC Output) Proceed To P0011 or P0012 A P0011 or P0012 and other DTCs B HINT: If any DTCs other than P0011 or P0012 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. PERFORM ACTIVE TEST USING HAND-HELD TESTER(OPERATE OCV) Connect the hand-held tester to the DLC3. Start the engine and turn the tester ON. Warm up the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / VVT CTRL B1. Check the engine speed while operating the Oil Control Valve (OCV) using the tester. OK: SPECIFIED CONDITIONS CHART Tester Operations Specified Conditions OCV OFF Normal engine speed OCV ON Engine idles roughly or stalls (soon after OCV switched from OFF to ON) NG: Go to step 4. OK: Go to next step.
3. CHECK WHETHER DTC OUTPUT RECURS(DTC P0011 OR P0012) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Start the engine and warm it up. Switch the ECM from normal mode to check mode using the tester (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ). Drive the vehicle for more than 10 minutes. Read DTCs using the tester. OK: No DTC output. NG: Go to step 4. OK: END
4. CHECK VALVE TIMING(CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) Remove the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). Turn the crankshaft pulley, then align its groove with the timing mark "0" of the timing chain cover. Check that both timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward (Scheme 48) If not, turn the crankshaft 1 revolution (360°), then align the marks as above. OK: The point marks on the camshaft timing gears are aligned with the timing chain cover surface. Reinstall the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). NG: ADJUST VALVE TIMING (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ) OK: Go to next step.
5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OCV) Remove the OCV. Measure the resistance between the terminals of the OCV. Standard: 6.9 to 7.9 ohms at 20°C (68°F) Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation. OK: Valve moves quickly. Reinstall the OCV. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY OK: Go to next step.
6. INSPECT OIL CONTROL VALVE FILTER Remove the generator (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). Remove the OCV filter. Check that the filter is not clogged. OK: Filter is not clogged. Reinstall the OCV filter (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). Reinstall the generator (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). NG: CLEAN OIL CONTROL VALVE FILTER OK: REPLACE CAMSHAFT TIMING GEAR ASSY After replacing the camshaft timing gear, confirm that the DTC output does not recur. Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Start the engine and warm it up. Switch the ECM from normal mode to check mode using the tester (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ). Drive the vehicle for more than 10 minutes. Confirm that no DTC is set using the tester.

OBDII scan tool (excluding the hand-held tester)

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO DTC P0011 OR P0012) Connect an OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Read DTCs using the scan tool. Result: DISPLAY (DTC OUTPUT) Display (DTC Output) Proceed To P0011 or P0012 A P0011 or P0012 and other DTCs B HINT: If any DTCs other than P0011 or P0012 are output, troubleshoot those DTCs first. B: GO TO DTC CHART(See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. CHECK OPERATION OF OCV Start the engine. Check the engine idling condition twice, when conditions (1) and (2) below. The C2 Oil Control Valve (OCV) connector is disconnected. The battery voltage is applied between the terminals of the OCV. Result: ENGINE IDLING CONDITION Conditions Engine Idling Engine Idling (1) Normal Other than indicated on left (2) Rough, or engine stalls Other than indicated on left Proceed To A B Reconnect the OCV connector. B: Go to step 4. A: Go to next step.
3. CHECK WHETHER DTC OUTPUT RECURS(DTC P0011 OR P0012) Clear the DTC(s) (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Operating the OBD II scan tool to erase the codes, or disconnect the battery cable or remove the EFI and ETCS fuses for more than 60 seconds. Start the engine and warm it up. Drive the vehicle for 10 minutes or more. Turn the ignition switch to OFF. Repeat the steps ( b ) and ( c ). Read output DTCs. OK: No DTC output. OK: VVT SYSTEM OK HINT: DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: Go to next step.
4. INSPECT ECM(OCV SIGNAL) Inspect the ECM using an oscilloscope. While idling, check the waveform between the terminals of the E5 ECM connector. Standard: ECM (OCV SIGNAL) Tester Connections Specified Conditions OCV+ (E5-15) - OCV- (E5-14) Correct waveform (Scheme 52)NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
5. CHECK VALVE TIMING(CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) Remove the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). Turn the crankshaft pulley, then align its groove with the timing mark "0" on the timing chain cover. Check that both timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration. If not, turn the crankshaft 1 revolution (360°), then align the marks as above. OK: The point marks on the camshaft timing gears are aligned with the timing chain cover surface. Reinstall the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). NG: ADJUST VALVE TIMING (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ) OK: Go to next step.
6. INSPECT OIL CONTROL VALVE FILTER Remove the generator (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). Remove the OCV filter. Check that the filter is not clogged. OK: Filter is not clogged. Reinstall the OCV filter (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). Reinstall the generator (see «REPLACEMENT»(ref-224535-S35589298482006031000000) ). NG: CLEAN OIL CONTROL VALVE FILTER OK: Go to next step.
7. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OCV) Remove the OCV. Measure the resistance between the terminals of the OCV. Standard: 6.9 to 7.9 ohms at 20°C (68°F) Apply the positive battery voltage to terminal 1 and negative battery voltage to terminal 2. Check the valve operation. OK: Valve moves quickly. Reinstall the OCV. OK: Go to step 9. NG: Go to next step.
8. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY(OCV) Go to next step.
9. INSPECT CAMSHAFT TIMING GEAR ASSY OK: Camshaft timing gear rotates smoothly when pressure is applied. OK: Go to step 11. NG: Go to next step.
10. REPLACE CAMSHAFT TIMING GEAR ASSY Go to next step.
11. CHECK FOR BLOCKAGES(OCV, OIL CHECK VALVE AND OIL HOLE) OK: No blockage. NG: REPAIR OR REPLACE OK: Go to next step.
12. CHECK WHETHER DTC OUTPUT RECURS(DTC P0011 OR P0012) Clear the DTC(s) (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Operating the OBD II scan tool to erase the codes, or disconnect the battery cable or remove the EFI and ETCS fuses for more than 60 seconds. Start the engine and warm it up. Drive the vehicle for 10 minutes or more. Turn the ignition switch to OFF. Repeat the steps (b) and (c). Read output DTCs. OK: No DTC output. OK: VVT SYSTEM OK HINT: DTC P0011 or P0012 may be set when foreign objects in the engine oil are caught in some parts of the system. The DTC will remain set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter. NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

CIRCUIT DESCRIPTION

Refer to DTC P0335 on DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT .

Scheme 56

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 57

1. CHECK VALVE TIMING(CHECK FOR LOOSE AND JUMPED TEETH ON TIMING CHAIN) Remove the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). Turn the crankshaft pulley, then align its groove with the timing mark "0" on the timing chain cover. Check that both timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward (Scheme 57) If not, turn the crankshaft 1 revolution (360°), then align the marks as above. OK: The point marks on the camshaft timing gears are aligned with the timing chain cover surface. Reinstall the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). NG: ADJUST VALVE TIMING (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) After replacing the ECM or adjusting intake valve timing, confirm that the DTC output does not recur. Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). If using a hand-held tester, switch the ECM from normal mode to check mode (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ). Start the engine and warm it up. Allow the engine to idle for 1 minute or more, and then drive the vehicle for 1 minute or more. If using an OBD II scan tool, turn the ignition switch to OFF, and then repeat steps (f) and (g) above. Confirm that no DTC is set, using the tester or scan tool.

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 58

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1. INSPECT HEATED OXYGEN SENSOR(HEATER RESISTANCE) Disconnect the H3 or H7 Heated Oxygen (HO2) sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: SPECIFIED CONDITIONS CHART Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher HT (H7-1) - +B (H7-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H7-1) - E1 (H7-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
2. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: SPECIFIED CONDITIONS CHART Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
3. INSPECT ECM (HTL OR HTL2 VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the applicable terminals of the E4 and E6 ECM connectors. Standard: HTL OR HTL2 VOLTAGE Tester Connections Specified Conditions HTL (E6-4) - E03 (E6-5) Between 9 and 14 V HTL2 (E4-4) - E03 (E6-5) Between 9 and 14 V OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step.
4. CHECK HARNESS AND CONNECTOR(HEATED OXYGEN SENSOR - ECM, HEATED OXYGEN SENSOR - EFI RELAY) Check the harness and connectors between the ECM and HO2 sensor. Disconnect the H3 or H7 HO2 sensor connector. Disconnect the E4 or E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H3-1) - HTL (E6-4) Below 1 ohms HT (H7-1) - HTL2 (E4-4) Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H3-1) or HTL (E6-4) - Body ground 10 kohms or higher HT (H7-1) or HTL2 (E4-4) - Body ground 10 kohms or higher Reconnect the HO2 sensor connector. Reconnect the ECM connector. Check the harness and connectors between the HO2 sensor and EFI relay. Disconnect the H3 or H7 HO2 sensor connector. Remove the EFI relay from the engine room R/B. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - EFI RELAY (CHECK FOR OPENING) Tester Connections Specified Conditions +B (H3-2) - EFI relay (3) Below 1 ohms +B (H7-2) - EFI relay (3) Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - EFI RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions +B (H3-2) or EFI relay (3) - Body ground 10 kohms or higher +B (H7-2) or EFI relay (3) - Body ground 10 kohms or higher Reconnect the HO2 sensor connector. Reinstall the EFI relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

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

By applying a specific electrical current to the wire, the ECM heats it to a given temperature. The flow of incoming air cools both the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume. The circuit is constructed so that the platinum hot wire and the temperature sensor provide a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain equal to maintain the predetermined temperature.

HINT

When any of these DTCs are set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is calculated by the ECM, according to the engine RPM and throttle valve position. Fail-safe mode continues until a pass condition is detected.

Scheme 66

Scheme 67

HINT

When any of these DTCs are set, check the air-flow rate by selecting the following menu items on a handheld tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAF.If using an OBD II scan tool, refer to the .

Scheme 68

HINT

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

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1. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(MASS AIR FLOW RATE) Connect a hand-held tester or OBD II scan tool to the DLC3. Start the engine. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /MAF. Read the values displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Result: MASS AIR FLOW RATE Mass Air Flow Rate (gm/s) Proceed To 0.0 A 271.0 or more B Between 1.0 and 270.0 ( (1) ) C (1) The value must be changed when the throttle valve is open or closed. B: Go to step 6 . C: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: Go to next step.
2. INSPECT MASS AIR FLOW METER (POWER SOURCE VOLTAGE) Disconnect the M1 Mass Air Flow (MAF) meter connector. Turn the ignition switch to ON. Measure the voltage between the terminal of the wire harness side connector and body ground. Standard: POWER SOURCE VOLTAGE Tester Connections Specified Conditions +B (M1-1) - Body ground Between 9 V and 14 V Reconnect the MAF meter connector. NG: Go to step 5 . OK: Go to next step.
3. INSPECT ECM (VG VOLTAGE) Start the engine. Measure the voltage between the specified terminals of the E6 ECM connector. HINT: The transmission gear selector lever should be in the P or N position and the A/C switch should be turned OFF. Standard: ECM (VG VOLTAGE) Tester Connections Conditions Specified Conditions VG (E6-24) - EVG (E6-32) Engine idling Between 0.5 V and 3.0 V OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step.
4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Disconnect the M1 MAF meter connector. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): MASS AIR FLOW METER - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions VG (M1-3) - VG (E6-24) Below 1 ohms E2G (M1-2)- EVG (E6-32) Below 1 ohms Standard (Check for short): MASS AIR FLOW METER - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions VG (M1-3) or VG (E6-24) - Body ground 10 kohms or higher Reconnect the MAF meter connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MASS AIR FLOW METER
5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - EFI RELAY) Remove the EFI relay from the engine room R/B. Disconnect the M1 MAF meter connector. Check the resistance. Standard (Check for open): MASS AIR FLOW METER - EFI RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions +B (M1-1)- EFI relay (3) Below 1 ohms Standard (Check for short): MASS AIR FLOW METER - EFI RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions +B (M1-1) or EFI relay (3) - Body ground 10 kohms or higher Reconnect the MAF meter connector. Reinstall the EFI relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: INSPECT ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-224516-S01199847272006031000000) )
6. INSPECT ECM (SENSOR GROUND) Check the resistance. Standard: ECM (SENSOR GROUND) Tester Connections Specified Conditions EVG (E6-32) - Body ground Below 1 ohms NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Disconnect the M1 MAF meter connector. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): MASS AIR FLOW METER - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions VG (M1-3) - VG (E6-24) Below 1 ohms E2G (M1-2)- EVG (E6-32) Below 1 ohms Standard (Check for short): MASS AIR FLOW METER - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions VG (M1-3) or VG (E6-24) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the MAF meter connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MASS AIR FLOW METER

Refer to DTC P0100 on DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE PROBLEM .

Scheme 78

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ANY OTHER DTCS OUTPUT(IN ADDITION TO DTC P0101) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0101 and other DTCs A P0101 B HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first. B: REPLACE MASS AIR FLOW METER A: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) )

The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the IAT. The IAT sensor has a built in thermistor with a resistance that varies according to the temperature of the intake air. When the IAT is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in resistance are transmitted to the ECM as voltage changes (Scheme 79)

The IAT sensor is powered by a 5 V supply from the THA terminal of the ECM, via resistor R.

Resistor R and the IAT sensor are connected in series. When the resistance value of the IAT sensor changes, according to changes in the IAT, the voltage at terminal THA also varies. Based on this signal, the ECM increases the fuel injection volume when the engine is cold to improve drivability.

Scheme 79

HINT

When any of DTCs P0110, P0112 and P0113 are set, the ECM enters fail-safe mode. During fail-safe mode, the IAT is estimated to be 20°C (68°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

Scheme 80

HINT

When any of these DTCs are set, check the IAT by selecting the following menu items on a hand-held tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. If using an OBD II scan tool, refer to the instruction manual .

TEMPERATURE REFERENCE

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 81

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1. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(INTAKE AIR TEMPERATURE) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /INTAKE AIR. Read the values displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: Same as actual Intake Air Temperature (IAT). Result: TEMPERATURE REFERENCE Temperature Displayed Proceed To -40 °C (-40 °F) A 140°C(284°F) or higher B Same as actual IAT C HINT: If there is an open circuit, the hand-held tester or OBD II scan tool indicates -40°C (-40°F). If there is a short circuit, the hand-held tester or OBD II scan tool indicates 140°C (284°F) or higher. B: Go to step 4. C: CHECK FOR INTERMITTENT PROBLEMS(See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR OPEN IN WIRE HARNESS) Disconnect the M1 Mass Air Flow (MAF) meter connector. Connect terminals THA and E2 of the MAF meter wire harness side connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: 140°C (284°F) or higher Reconnect the MAF meter connector. OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER NG: Go to next step.
3. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR OPEN IN ECM) Disconnect the M1 MAF meter connector. Connect terminals THA and E2 of the E5 ECM connector. HINT: Before checking, do visual and contact pressure checks on the ECM connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: 140°C (284°F) or higher Reconnect the MAF meter connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
4. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR SHORT IN WIRE HARNESS) Disconnect the M1 MAF meter connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: -40°C (-40°F) Reconnect the MAF meter connector. OK: REPLACE MASS AIR FLOW METER NG: Go to next step.
5. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR SHORT IN ECM) Disconnect the E5 ECM connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / INTAKE AIR. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: -40°C (-40°F) Reconnect the ECM connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value varies according to the ECT.

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

HINT

When any of DTCs P0115, P0117 and P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the ECT is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

Scheme 88

HINT

When any of these DTCs are set, check the ECT by selecting the following menu items on a hand-held tester: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. If using an OBD II scan tool, refer to the .

TEMPERATURE REFERENCE

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 89

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1. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL (ENGINE COOLANT TEMPERATURE) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /COOLANT TEMP. Read the values displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: Between 80°C and 97°C (176°F and 207°F) with warm engine. Result: TEMPERATURE REFERENCE Temperature Displayed Proceed To -40 °C (-40 °F) A 140°C (284°F) or higher B Between 80° C and 97° C (176°F and 207° F) C HINT: If there is an open circuit, the hand-held tester or OBD II scan tool indicates -40°C (-40°F). If there is a short circuit, the hand-held tester or OBD II scan tool indicates 140°C (284°F) or higher. B: Go to step 4 . C: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR OPEN IN WIRE HARNESS) Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: 140°C (284°F) or higher Reconnect the ECT sensor connector. OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR NG: Go to next step.
3. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR OPEN IN ECM) Disconnect the E2 ECT sensor connector. Connect terminals THW and E2 of the E5 ECM connector. HINT: Before checking, do visual and contact pressure checks on the ECM connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: 140°C (284°F) or higher Reconnect the ECT sensor connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
4. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E2 ECT sensor connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: -40°C (-40°F) Reconnect the ECT sensor connector. OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR NG: Go to next step.
5. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(CHECK FOR SHORT IN ECM) Disconnect the E5 ECM connector. Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: -40°C (-40°F) Reconnect the ECM sensor connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

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

Scheme 96

HINT

1. If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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

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1. READ VALUE USING HAND-HELD TESTER (THROTTLE VALVE OPENING PERCENTAGE) Connect a hand-held tester or OBD II scan tool to the DLC3. Start the engine. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / THROTTLE POS. Read its value displayed on the tester when the accelerator pedal is released and depressed. Result: THROTTLE VALVE OPENING PERCENTAGE Throttle Valve Opening Angle (%) Proceed To 0 A From approximately 0 to 75 B Approximately 100 C B: CHECK FOR INTERMITTENT PROBLEMS C: Go to step 4 . A: Go to next step.
2. INSPECT THROTTLE POSITION SENSOR Disconnect the T1 Throttle Position (TP) sensor connector. Measure the resistance between the terminals of the TP sensor. Standard: THROTTLE POSITION SENSOR Tester Connections Throttle Valve Positions Specified Conditions VC (T1-1) - E2 (T1-2) - Between 2.5 kohms and 5.9 kohms VTA(T1-3) - E2 (T1-2) Fully closed Between 0.2 kohms and 5.7 kohms VTA(T1-3) - E2 (T1-2) Fully open Between 2.0 kohms and 10.2 kohms Reconnect the TP sensor connector. NG: REPLACE THROTTLE POSITION SENSOR OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (ECM - THROTTLE POSITION SENSOR) Disconnect the E5 ECM connector. Measure the resistance between the terminals of the E5 ECM connector. Standard: ECM - THROTTLE POSITION SENSOR Tester Connections Throttle Valve Positions Specified Conditions VC (E5-18) - E2 (E5-28) - Between 2.5 kohms and 5.9 kohms VTA(E5-21) - E2 (E5-28) Fully closed Between 0.2 kohms and 5.7 kohms VTA(E5-21) - E2 (E5-28) Fully open Between 2.0 kohms and 10.2 kohms Check the resistance between the terminals of the E5 ECM connector. Standard (Check for short): ECM - THROTTLE POSITION SENSOR (CHECK FOR SHORT) Tester Connections Specified Conditions VC (E5-18) - Body ground 10 kohms or higher VTA (E5-28) - Body ground 10 kohms or higher Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
4. INSPECT THROTTLE POSITION SENSOR Disconnect the T1 TP sensor connector. Measure the resistance between the terminals of the TP sensor. Standard: THROTTLE POSITION SENSOR Tester Connections Throttle Valve Positions Specified Conditions VC (T1-1) - E2 (T1-2) - Between 2.5 kohms and 5.9 kohms VTA (T1-3) - E2 (T1-2) Fully closed Between 0.2 kohms and 5.7 kohms VTA (T1-3) - E2 (T1-2) Fully open Between 2.0 kohms and 10.2 kohms Reconnect the TP sensor connector. NG: REPLACE THROTTLE POSITION SENSOR OK: Go to next step.
5. CHECK HARNESS AND CONNECTOR (ECM - THROTTLE POSITION SENSOR) Disconnect the E5 ECM connector. Disconnect the T1 TP sensor connector. Check the resistance. Standard (Check for open): ECM - THROTTLE POSITION SENSOR (CHECK FOR OPEN) Tester Connections Specified Conditions VC (T1-1) - VC (E5-18) Below 1 ohms VTA (T1-3) - VTA (E5-21) Below 1 ohms E2 (T1-2) - E2 (E5-28) Below 1 ohms Standard (Check for short): ECM - THROTTLE POSITION SENSOR (CHECK FOR SHORT) Tester Connections Specified Conditions VC (T1-1) or VC (E5-18) - Body ground 10 kohms or higher VTA (T1-3) or VTA (E5-21) - Body ground 10 kohms or higher Reconnect the TP sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

OBD II scan tool (excluding the hand-held tester)

Scheme 103

Scheme 104

Scheme 105

Scheme 106

Scheme 107

1. INSPECT THROTTLE POSITION SENSOR Disconnect the T1 Throttle Position (TP) sensor connector. Measure the resistance between the terminals of the TP sensor. Standard: Reconnect the TP sensor connector. NG: REPLACE THROTTLE POSITION SENSOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the E5 ECM connector. Measure the resistance between the terminals of the E5 ECM connector. Standard: Check the resistance. Standard (Check for short): Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0121) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0121 and other DTCs A P0121 B HINT: If any DTCs other than P0121 are output, troubleshoot those DTCs first. B: REPLACE THROTTLE POSITION SENSOR A: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) )

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

Scheme 108

HINT

1. If any of DTCs P0115, P0116, P0117 or P0118 are set simultaneously with DTC P0125, the Engine Coolant Temperature (ECT) sensor may have an open or a short circuit. Troubleshoot those DTCs first.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ANY OTHER DTCS OUTPUT(IN ADDITION TO DTC P0125) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0125 A P0125 and other DTCs B HINT: If any DTCs other than P0125 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. INSPECT THERMOSTAT (See «INSPECTION»(ref-224540-S12598440602006031000000) ) Remove the thermostat (See «REPLACEMENT»(ref-224540-S08692023812006031000000) ). Check the valve opening temperature of the thermostat. Standard: 80° to 84°C (176° to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the thermostat (see «REPLACEMENT»(ref-224540-S08692023812006031000000) ). NG: REPLACE THERMOSTAT (see «REPLACEMENT»(ref-224540-S08692023812006031000000) ) OK: Go to next step.
3. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG: REPAIR OR REPLACE COOLING SYSTEM OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0128 A P0128 and other DTCs B HINT: If any DTCs other than P0128 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. CHECK COOLING SYSTEM Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications. NG: REPAIR OR REPLACE COOLING SYSTEM OK: Go to next step.
3. INSPECT THERMOSTAT (See «INSPECTION»(ref-224540-S12598440602006031000000) ) Remove the thermostat (see «REPLACEMENT»(ref-224540-S08692023812006031000000) ). Check the valve opening temperature of the thermostat. Standard: 80° to 84°C (176° to 183°F) HINT: In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard. Reinstall the thermostat (see «REPLACEMENT»(ref-224540-S08692023812006031000000) ). NG: REPLACE THERMOSTAT (see «REPLACEMENT»(ref-224540-S08692023812006031000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

O2S TEST RESULT

Refer to O2S TEST RESULT for detailed information on O2S Test Result.

TEST ITEM DESCRIPTIONS

Scheme 109

Scheme 110

HINT

This confirmation driving pattern is used in step 9 of the following diagnostic troubleshooting procedure.

1. Connect a hand-held tester or OBD II scan tool the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester or scan tool ON.
4. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ).
5. If using a hand-held tester, switch the ECM from normal mode to check mode (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ).
6. Start the engine.
7. Allow the engine to idle until the engine coolant temperature reaches 75°C (167°F).
8. Drive the vehicle at an engine speed of more than 25 mph (40 km/h) for 35 seconds or more.
9. Allow the engine to idle for 40 seconds or more.
10. Repeat steps (g) and (h) described above at least 3 times.
11. Allow the engine to idle for 40 seconds or more.
12. If using an OBD II scan tool, conduct the following additional operations: Turn the ignition switch to OFF. Repeat steps from ( g ) through ( k ) described above.

HINT

1. When using a hand-held tester: The MIL will be illuminated during step (k) if a malfunction still exists.
2. When using an OBD II scan tool: The MIL will be illuminated during step (k) the second time if a malfunction still exists.

Note. If the conditions in this test are not strictly followed, malfunctions may not be detected.

HINT

Hand-held tester only

Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Heated Oxygen (HO2) sensors and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.

1. Connect a hand-held tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the voltage outputs of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester.

HINT

1. The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Standard

FUEL INJECTION VOLUME STANDARD

Note. The front HO2 sensor has an output delay of a few seconds and the rear HO2 sensor has a maximum output delay of approximately 20 seconds.

Scheme 111

1. Following the A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the front and rear HO2 sensors.
2. To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/ A/F CONTROL / USER DATA / AFS B1S2 and OS2 B1B2, and press the YES button and then the ENTER button followed by the F4 button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes lean and HO2 sensor DTCs are recorded, and the ECM illuminates the MIL.

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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. A high HO2 sensor (sensor 1) voltage (0.55 V or more) could be caused by a rich air-fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low HO2 sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air-fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 112

Scheme 113

Scheme 114

Scheme 115

Scheme 116

Scheme 117

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO HEATED OXYGEN SENSOR DTCS) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0130, P2195 and/or P2196 A P0130, P2195 and/or P2196 and other DTCs B HINT: If any DTCs other than P0130, P2195 and/or P2196 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Start the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /O2S B1S1. Warm up the Heated Oxygen (HO2) sensor at an engine speed of 2,500 rpm for approximately 90 seconds. Read the voltage output of the front HO2 sensor displayed on the tester, while the engine is idling. If using an OBD II scan tool, refer to the instruction manual . Standard: Fluctuates between less than 0.4 V and more than 0.55 V (refer to table below). OK: Go to step 9 . NG: Go to next step.
3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H3 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
4. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the H3 HO2 sensor connector. Turn the ignition switch to ON. Measure the voltage between the +B terminal of the H3 HO2 sensor connector and body ground. Standard: HEATED OXYGEN SENSOR - ECM Tester Connections Specified Conditions +B (H3-2) - Body ground Between 9 V and 14 V Turn the ignition switch to OFF. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H3-1) - HTL (E6-4) Below 1 ohms OX (H3-3) - OXL1 (E6-23) Below 1 ohms E1 (H3-4) - Body ground Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H3-1) or HTL (E6-4) - Body ground 10 kohms or higher OX (H3-3) or OXL1 (E6-23) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
6. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leaks. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure (high or low pressure). NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
8. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) (See «INSPECTION»(ref-224533-S14983714392006031000000) ) Check the injector injection and volume. NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-224533-S14956516082006031000000) ) OK: REPLACE HEATED OXYGEN SENSOR
9. PERFORM CONFIRMATION DRIVING PATTERN Go to next step.
10. CHECK WHETHER DTC OUTPUT RECURS(HEATED OXYGEN SENSOR DTCS) Read DTCs using the hand-held tester or OBD II scan tool. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed To P0130, P2195 and/or P2196 A No output B B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: REPLACE HEATED OXYGEN SENSOR

O2S TEST RESULT (MODE 05 DATA)

Refer to O2S TEST RESULT for detailed information on O2S Test Result.

TEST DATA DESCRIPTION

HINT

Hand-held tester only

Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Heated Oxygen (HO2) sensors and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.

1. Connect a hand-held tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the voltage output of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester.

HINT

1. The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Standard

INJECTION VOLUMES STANDARD

Note. The front HO2 sensor has an output delay of a few seconds and the rear HO2 sensor has a maximum output delay of approximately 20 seconds.

Scheme 118

1. Following A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the front and rear HO2 sensors.
2. To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/ A/F CONTROL / USER DATA / AFS B1S2 and OS2 B1B2, and press the YES button and then the ENTER button followed by the F4 button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes lean and HO2 sensor DTCs are recorded, and the ECM illuminates the MIL.

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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. A high HO2 sensor (sensor 1) voltage (0.55 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low HO2 sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 119

Scheme 120

Scheme 121

Scheme 122

Scheme 123

Scheme 124

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO DTC P0133) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0133 A P0133 and other DTCs B HINT: If any DTCs other than P0133 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(HEATED OXYGEN SENSOR DURING IDLING) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Start the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /O2S B1S1. Warm up the Heated Oxygen (HO2) sensor at an engine speed of 2,500 rpm for approximately 90 seconds. Read the voltage output of the front HO2 sensor displayed on the tester, while the engine is idling. If using an OBD II scan tool, refer to the instruction manual . Standard: Fluctuates between less than 0.40 V and more than 0.45 V, and period t must last for less than 0.6 seconds (refer to table below). OK: Go to step 9 . NG: Go to next step.
3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H3 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: HEATED OXYGEN SENSOR (HEATER RESISTANCE) Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
4. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3-5 10 kohms or higher 3-5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the H3 HO2 sensor connector. Turn the ignition switch to ON. Measure the voltage between the +B terminal of the H5 HO2 sensor connector and body ground. Standard: HEATED OXYGEN SENSOR - ECM Tester Connections Specified Conditions +B (H3-2) - Body ground Between 9 V and 14 V Turn the ignition switch to OFF. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H3-1) - HTL (E6-4) Below 1 ohms OX (H3-3) - OXL1 (E6-23) Below 1 ohms E1 (H3-4) - Body ground Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H3-1) or HTL (E6-4) - Body ground 10 kohms or higher OX (H3-3) or OXL1 (E6-23) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
6. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leaks. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure (high or low pressure). NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
8. INSPECT FUEL INJECTOR ASSY(INJECTION AND VOLUME) (See «INSPECTION»(ref-224533-S14983714392006031000000) ) Check the injector injection and volume. NG: REPLACE FUEL INJECTOR ASSY OK: REPLACE HEATED OXYGEN SENSOR
9. PERFORM CONFIRMATION DRIVING PATTERN (See «READINESS MONITOR DRIVE PATTERN»(ref-224516-S07241703912006031000000) ) Go to next step.
10. CHECK WHETHER DTC OUTPUT RECURS (DTC P0133) 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 ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0133 A No output B B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: REPLACE HEATED OXYGEN SENSOR

HINT

Hand-held tester only

Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Heated Oxygen (HO2) sensors and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.

1. Connect a hand-held tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the voltage output of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester.

HINT

1. The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Standard

FUEL INJECTION VOLUME STANDARD

Note. The front HO2 sensor has an output delay of a few seconds and the rear HO2 sensor has a maximum output delay of approximately 20 seconds.

Scheme 125

1. Following A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the front and rear HO2 sensors.
2. To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/ A/F CONTROL / USER DATA / AFS B1S2 and OS2 B1B2, and press the YES button and then the ENTER button followed by the F4 button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes lean and HO2 sensor DTCs are recorded, and the ECM illuminates the MIL.

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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. A high HO2 sensor (sensor 1) voltage (0.55 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low HO2 sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 126

Scheme 127

Scheme 128

Scheme 129

Scheme 130

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO PTC P0134) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed to P0134 A P0134 and other DTCs B HINT: If any DTCs other than P0134 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Start the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S1 and ENGINE SPD. Warm up the engine until the engine coolant temperature reaches more than 75°C (169°F). Rev the engine up to 4,000 rpm, 3 times using the accelerator pedal. Read the output voltage of the front Heated Oxygen (HO2) sensor displayed on the tester, when the engine speed is suddenly increased. If using an OBD II scan tool, refer to the instruction manual . Standard: HO2 sensor voltage output indicates 0.45 V or more (rich signal) at least once. OK: Go to step 12 . NG: Go to next step.
3. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
4. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H3 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: HEATED OXYGEN SENSOR (HEATER RESISTANCE) Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
5. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the H3 HO2 sensor connector. Turn the ignition switch to ON. Measure the voltage between the +B terminal of the H3 HO2 sensor connector and body ground. Standard: HEATED OXYGEN SENSOR - ECM Tester Connections Specified Conditions +B (H3-2) - Body ground Between 9 V and 14 V Turn the ignition switch to OFF. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H3-1) - HTL (E6-4) Below 1 ohms OX (H3-3) - OXL1 (E6-23) Below 1 ohms E1 (H6-4) - Body ground Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H3-1) or HTL (E6-4) - Body ground 10 kohms or higher OX (H3-3) or OXL1 (E6-23) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
7. CHECK WHETHER MISFIRE OCCURS BY MONITORING PTC AND DATA LIST NG: TROUBLESHOOT MISFIRE (See «DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED»(ref-224516-S10212381102006031000000) ) OK: Go to next step.
8. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leaks. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
9. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure. NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
10. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) (See «INSPECTION»(ref-224533-S14983714392006031000000) ) Check the injector injection and volume. NG: REPLACE FUEL INJECTOR ASSY OK: Go to next step.
11. CHECK FOR EXHAUST GAS LEAKS NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: REPLACE HEATED OXYGEN SENSOR
12. 12 PERFORM CONFIRMATION DRIVING PATTERN (See «READINESS MONITOR DRIVE PATTERN»(ref-224516-S07241703912006031000000) ) Go to next step.
13. CHECK WHETHER PTC OUTPUT RECURS(DTC P0134) Read DTCs using the hand-held tester or OBD II scan tool. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed To No output A P0134 B B: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) A: Go to next step.
14. CONFIRM WHETHER VEHICLE HAS RUN OUT OF FUEL IN PAST NO: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) YES: DTC CAUSED BY RUNNING OUT OF FUEL

The rear Heated Oxygen (HO2) sensor is located behind the Three-Way Catalytic Converter (TWC), and detects the oxygen concentration in the exhaust gas. For optimum TWC operation, the air fuel mixture must be maintained as close as possible to the stoichiometric ratio. The HO2 sensor output voltage changes dramatically in the vicinity of the stoichiometric ratio. By making adjustments in accordance to these signal voltage changes, the ECM adjusts the fuel injection time so that the air-fuel ratio remains as close as possible to stoichiometric levels.

The rear HO2 sensor generates a voltage that ranges from 0.1 V to 0.9 V according to the oxygen concentration in the exhaust gas. When the oxygen concentration in the exhaust gas increases, the HO2 sensor voltage drops below 0.45 V. The ECM interprets this as the air-fuel ratio being lean. Alternatively, the sensor voltage rises to more than 0.45 V when there is no oxygen in the exhaust gas. The ECM interprets this as the air-fuel ratio being rich.

Scheme 131

Refer to O2S TEST RESULT for detailed information.

TEST ITEMS STANDARD VALUE

HINT

Hand-held tester only

Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Heated Oxygen (HO2) sensors and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.

1. Connect a hand-held tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the voltage output of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester.

HINT

1. The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume.

Standard

FUEL INJECTION VOLUME STANDARD

Note. The front HO2 sensor has an output delay of a few seconds and the rear HO2 sensor has a maximum output delay of approximately 20 seconds.

Scheme 132

1. Following A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the front and rear HO2 sensors.
2. To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/ A/F CONTROL / USER DATA / AFS B1S2 and OS2 B1B2, and press the YES button and then the ENTER button followed by the F4 button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes lean and HO2 sensor DTCs are recorded, and the ECM illuminates the MIL.

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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. A high HO2 sensor (sensor 1) voltage (0.55 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low HO2 sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Scheme 133

Scheme 134

Scheme 135

Scheme 136

Scheme 137

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0136 AND/OR P0138) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed To P0136 and/or P0138 A P0136 and/or P0138, and other DTCs B HINT: If any DTCs other than P0136 and/or P0138 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Start the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / O2S B1S2 and ENGINE SPD. Warm up the engine. Run the engine at an engine speed of 2,500 rpm for 3 minutes. Rev the engine up to 4,000 rpm 3 times using the accelerator pedal. Read the output voltage of the rear Heated Oxygen (HO2) sensor displayed on the tester, when the engine speed is suddenly increased. If using an ODB II scan tool, refer to the instruction manual . Standard: Rear HO2 sensor voltage output fluctuates between less than 0.4 V and more than 0.55 V. OK: Go to step 6 . NG: Go to next step.
3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H8 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: HEATED OXYGEN SENSOR (HEATER RESISTANCE) Tester Connections Specified Conditions HT (H7-2) - +B (H7-1) Between 11 ohms and 16 ohms at 20 °C (68 °F) HT (H7-2) - E1 (H7-3) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
4. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the resistance of the EFI relay. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the H7 HO2 sensor connector. Disconnect the E4 and E6 ECM connectors. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H7-2) - HTL2 (E4-4) Below 1 ohms OX (H7-4) - OXL2 (E6-21) Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H7-2) or HTL2 (E4-4) - Body ground 10 kohms or higher OX (H7-4) or OXL2 (E6-21) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE HEATED OXYGEN SENSOR
6. PERFORM CONFIRMATION DRIVING PATTERN Next: Go to next step.
7. CHECK WHETHER DTC OUTPUT RECURS (DTC P0136 AND/OR P0138) Read DTCs using the hand-held tester or OBD II scan tool. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO/CURRENT CODES. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed To P0136 and/or P0138 A No output B B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) A: REPLACE HEATED OXYGEN SENSOR

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

The short-term fuel trim is fuel compensation that is used to constantly maintain the air-fuel ratio at stoichiometric levels. The signal from the front Heated Oxygen (HO2) sensor indicates whether the air-fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air-fuel ratio is rich and an increase in the fuel injection volume if it is lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

If both the short-term and long-term fuel trims are lean or rich beyond predetermined values, it is interpreted as a malfunction, and the ECM illuminates the MIL and sets a DTC.

Scheme 138

HINT

1. When DTC P0171 is set, the actual air-fuel ratio is on the lean side. When DTC P0172 is set, 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 may be set. The MIL is then illuminated.
3. When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is more than 75°C [167°F]), the system is functioning normally.

HINT

Hand-held tester only

Malfunctioning areas can be identified by performing the A/F CONTROL function provided in the ACTIVE TEST. The A/F CONTROL function can help to determine whether the Heated Oxygen (HO2) sensors and other potential trouble areas are malfunctioning.

The following instructions describe how to conduct the A/F CONTROL operation using a hand-held tester.

1. Connect a hand-held tester to the DLC3.
2. Start the engine and turn the tester ON.
3. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds.
4. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
5. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume).
6. Monitor the voltage outputs of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester.

HINT

1. The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
2. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Standard: FUEL INJECTION VOLUME STANDARD Tester Display (Sensor) Injection Volumes Status Voltages O2S B1S1 (Front HO2 Sensor) +25 % Rich More than 0.55 O2S B1S1 (Front HO2 Sensor) -12.5 % Lean Less than 0.4 O2S B1S2 (Rear HO2 Sensor) +25 % Rich More than 0.5 O2S B1S2 (Rear HO2 Sensor) -12.5 % Lean Less than 0.4

Note. The front HO2 sensor has an output delay of a few seconds and the rear HO2 sensor has a maximum output delay of approximately 20 seconds.

Scheme 139

1. Following A/F CONTROL procedure enables technicians to check and graph the voltage outputs of both the front and rear HO2 sensors.
2. To display the graph, select the following menu items on the tester: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST/ A/F CONTROL / USER DATA / AFS B1S2 and OS2 B1B2, and press the YES button and then the ENTER button followed by the F4 button.

Note. If the vehicle is short of fuel, the air-fuel ratio becomes lean and HO2 sensor DTCs are recorded, and the ECM illuminates the MIL.

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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. A high HO2 sensor (sensor 1) voltage (0.55 V or more) could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A low HO2 sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

Hand-held tester

Scheme 140

Scheme 141

Scheme 142

Scheme 143

Scheme 144

Scheme 145

Scheme 146

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171 OR P0172) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0171 or P0172 A P0171 or P0172 and other DTCs B HINT: If any DTCs other than P0171 or P0172 are output, perform troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly, and is not damaged. NG: REPAIR OR REPLACE PCV HOSE (See «ON-VEHICLE INSPECTION»(ref-224534-S40131610082006031000000) ) OK: Go to next step.
3. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
4. PERFORM ACTIVE TEST USING HAND-HELD TESTER(A/F CONTROL) Connect the hand-held tester to the DLC3. Start the engine and turn the tester ON. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage output of the Heated Oxygen (HO2) sensors (O2S B1S1 and O2S B1S2) displayed on the tester. HINT: The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Standard: FUEL INJECTION VOLUME STANDARD Tester Display (Sensor) Injection Volumes Status Voltages O2S B1S1 (Front HO2 Sensor) +25% Rich More than 0.55 O2S B1S1 (Front HO2 Sensor) -12.5% Lean Less than 0.4 O2S B1S2 (Rear HO2 Sensor) +25% Rich More than 0.5 O2S B1S2 (Rear HO2 Sensor) -12.5% Lean Less than 0.4 Result: Lean: During A/F CONTROL, both the front and rear HO2 sensor output voltages (O2S) are consistently less than 0.4 V. Rich During A/F CONTROL, both the O2S voltages are consistently more than 0.55 V. B: Go to step 11 . C: Go to step 15 . A: Go to next step.
5. READ VALUE USING HAND-HELD TESTER (COOLANT TEMP) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the COOLANT TEMP twice, when the engine is cold and also when warmed up. Standard: With cold engine: Same as ambient air temperature. With warm engine: Between 75°C and 95°C (167°F and 203°F) NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR OK: Go to next step.
6. READ VALUE USING HAND-HELD TESTER(MAF) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAF and COOLANT TEMP. Allow the engine to idle until the COOLANT TEMP reaches 75°C (167°F). Read the MAF with the engine in an idling condition and at an engine speed of 2,500 rpm. Standard: MAF while engine idling: Between 1.4 gm/s and 2.3 gm/s (A/C: OFF). MAF at engine speed of 2,500 rpm: Between 5.4 gm/s and 7.9 gm/s (A/C: OFF). NG: REPLACE MASS AIR FLOW METER OK: Go to next step.
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure (high or low pressure). NG: REPAIR OR REPLACE FUEL SYSTEM (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) OK: Go to next step.
8. CHECK FOR EXHAUST GAS LEAKAGE OK: No gas leakage. NG: REPAIR OR REPLACE EXHAUST SYSTEM OK: Go to next step.
9. CHECK FOR SPARKS AND IGNITION HINT: If the spark plugs or ignition system malfunctions, engine misfire may occur. The misfire count can be read using a hand-held tester. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL #1 (to CYL #4). NG: REPAIR OR REPLACE IGNITION SYSTEM OK: Go to next step.
10. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) HINT: If the injectors malfunction, engine misfire may occur. The misfire count can be read using a hand-held tester. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL #1 (to CYL #4). NG: REPLACE FUEL INJECTOR ASSY OK: Go to next step.
11. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H3 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: HEATED OXYGEN SENSOR (HEATER RESISTANCE) Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
12. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
13. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM) Disconnect the H3 HO2 sensor connector. Turn the ignition switch to ON. Measure the voltage between the +B terminal of the H3 HO2 sensor connector and body ground. Standard: HEATED OXYGEN SENSOR (SENSOR 1) - ECM Tester Connections Specified Conditions +B (H3-2) - Body ground Between 9 V and 14 V Turn the ignition switch to OFF. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR (SENSOR 1) - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H5-1) - HTL (E4-4) Below 1 ohms OX (H5-3) - OXL1 (E4-23) Below 1 ohms E1 (H5-4) - Body ground Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR (SENSOR 1) - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H5-1) or HT1A (E4-4) - Body ground 10 kohms or higher OX (H5-3) or OX1A (E4-23) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
14. REPLACE HEATED OXYGEN SENSOR (SENSOR 1) Go to next step.
15. PERFORM CONFIRMATION DRIVING PATTERN Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Clear DTCs. (See «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ) Switch the ECM from normal mode to check mode using the tester (see «CHECK MODE PROCEDURE»(ref-224516-S30770394862006031000000) ). Start the engine and warm it up with all accessaries switched OFF. Drive the vehicle at 31 mph (50 km/h) or more for 3 to 5 minutes. Allow the engine to idle for 2 minutes. Perform steps ( f ) and ( g ) at least 3 times. Go to next step.
16. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171 OR P0172) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the hand-held tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To No output A P0171 or P0172 B B: Go to step 5 A: END

OBDII scan tool (excluding the hand-held tester)

Scheme 147

Scheme 148

Scheme 149

Scheme 150

Scheme 151

Scheme 152

Scheme 153

1. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
2. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly, and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
3. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) (See «INSPECTION»(ref-224533-S14983714392006031000000) ) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor). NG: REPLACE FUEL INJECTOR ASSY OK: Go to next step.
4. READ VALUE USING OBD II SCAN TOOL(COOLANT TEMP) Connect an OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Read the engine coolant temperature value using the scan tool twice, when the engine is cold and also warmed up. Standard: With cold engine: Same as ambient air temperature. With warm engine: Between 75°C and 95°C (167°F and 203°F) NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR OK: Go to next step.
5. READ VALUE USING OBD II SCAN TOOL(MAF) Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Allow the engine to idle until the coolant temperature reaches 75°C (167°F). Read the MAF value using the scan tool at idle rpm and 2,500 rpm. Standard: Mass air flow rate at idle rpm: 1.4 to 2.3 gm/s (shift position: N and A/C: OFF) Mass air flow rate at 2,500 rpm: 5.4 to 7.9 gm/s (shift position: N and A/C: OFF) NG: REPLACE MASS AIR FLOW METER OK: Go to next step.
6. CHECK FOR SPARKS AND IGNITION (See «DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED»(ref-224516-S10212381102006031000000) ) OK: Sparks occur. NG: REPAIR OR REPLACE MALFUNCTION PARTS OK: Go to next step.
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure. NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
8. CHECK FOR EXHAUST GAS LEAKAGE OK: No gas leakage. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: Go to next step.
9. READ VALUE USING OBD II SCAN TOOL(OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR (SENSOR 1)) Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Start the engine. Warm up the front Heated Oxygen (HO2) sensor at an engine speed of 2,500 rpm for approximately 90 seconds. Read the output voltage of the front HO2 sensor using the OBD II scan tool while idling. Standard: Fluctuates between less than 0.4 V and more than 0.55 V (Scheme 147) NG: Go to step 16 OK: Go to next step.
10. PERFORM CONFIRMATION DRIVING PATTERN Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Start the engine. Warm up the engine. Drive the vehicle at 31 mph (50 km/h) or more for 3 to 5 minutes. Allow the engine to idle for 2 minutes. Repeat steps ( f ) and ( g ) above at least 3 times. Turn the ignition switch to OFF and repeat steps from ( d ) through ( h ) described above. Go to next step.
11. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171 OR P0172) Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the OBD II scan tool ON. Read DTCs using the OBD II scan tool. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0171 or P0172 A No output B B: Go to step 15 A: Go to next step
12. REPLACE HEATED OXYGEN SENSOR(SENSOR 1) Go to next step.
13. PERFORM CONFIRMATION DRIVING PATTERN HINT: Refer to step 10 Go to next step.
14. CHECK WHETHER DTC OUTPUT RECURS(DTC P0171 OR P0172) Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the OBD II scan tool ON. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To No output A P0171 or P0172 B B: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) AND PERFORM CONFIRMATION DRIVING PATTERN (Refer to step 10 ) A: Go to next step.
15. CONFIRM WHETHER VEHICLE HAS RUN OUT OF FUEL IN PAST NO: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) YES: DTC CAUSED BY RUNNING OUT OF FUEL(DTCS P0171 AND/OR P0172)
16. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H3 HO2 sensor connector. Measure the resistance between the terminals of the HO2 sensor connector. Standard: HEATED OXYGEN SENSOR (HEATER RESISTANCE) Tester Connections Specified Conditions HT (H3-1) - +B (H3-2) Between 11 ohms and 16 ohms at 20°C (68°F) HT (H3-1) - E1 (H3-4) 10 kohms or higher Reconnect the HO2 sensor connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
17. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
18. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR (SENSOR 1) - ECM) Disconnect the H3 HO2 sensor connector. Turn the ignition switch to ON. Measure the voltage between the +B terminal of the H3 HO2 sensor connector and body ground. Standard: HEATED OXYGEN SENSOR (SENSOR 1) - ECM Tester Connections Specified Conditions +B (H3-2) - Body ground Between 9 V and 14 V Turn the ignition switch to OFF. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): HEATED OXYGEN SENSOR (SENSOR 1) - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions HT (H5-1) - HTL (E4-4) Below 1 ohms OX (H5-3) - OXL1 (E4-23) Below 1 ohms E1 (H5-4) - Body ground Below 1 ohms Standard (Check for short): HEATED OXYGEN SENSOR (SENSOR 1) - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions HT (H5-1) or HTL (E4-4) - Body ground 10 kohms or higher OX (H5-3) or OXL1 (E4-23) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the HO2 sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
19. REPLACE HEATED OXYGEN SENSOR(SENSOR 1) Go to next step.
20. PERFORM CONFIRMATION DRIVING PATTERN HINT: Refer to step 10. Go to next step.
21. CHECK WHETHER DTC OUTPUT RECURS(DTC P0171 OR P0172) Connect the OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the OBD II scan tool ON. Read DTCs using the OBD II scan tool. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To No output A P0171 or P0172 B B: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) AND PERFORM CONFIRMATION DRIVING PATTERN (Refer to step 10 ) A: Go to next step.
22. CONFIRM WHETHER VEHICLE HAS RUN OUT OF FUEL IN PAST NO: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) YES: DTC CAUSED BY RUNNING OUT OF FUEL (DTCS P0171 OR P0172)

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increase in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent this increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds.

If the misfire exceeds the threshold levels, and could cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

Scheme 154

Scheme 155

HINT

When the DTCs for misfiring cylinders are recorded repeatedly but no random misfire DTC is recorded, it indicates that the misfires have been set and recorded at different times. Random misfire codes are recorded only when several misfires occur at the same time.

Reference: Inspection using the oscilloscope

With the engine idling, check the waveform between terminals #1 to #4 and E01 of the ECM connectors.

TERMINAL REFERENCE

HINT

The correct waveform is (Scheme 156)

Scheme 156

HINT

1. If any DTCs other than the misfire DTCs are output, troubleshoot those DTCs first.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.
3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the freeze frame data.
4. The misfire still cannot be reproduced even though the conditions stored in the freeze frame data have been duplicated, one of the following factors is considered to be a possible cause of the problem: The fuel tank is low full. Improper fuel is used. The ignition plugs have been contaminated. The problem is complex.
5. After finishing repairs, check the misfire counts of the cylinders (CYL #1, #2, #3 and #4).
6. Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern, after repairs.
7. For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set. In the event of DTC P0300 being present, perform the following operations: Clear the DTC (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Start the engine and conduct the confirmation driving pattern. Read the misfiring rates of each cylinder or DTC(s) using the tester or scan tool. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
8. When one of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data is outside the range of +/-20%, the air-fuel ratio may be rich (-20% or less) or lean (+20% or more).
9. When the COOLANT TEMP in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.

Scheme 157

Scheme 158

Scheme 159

Scheme 160

Scheme 161

Scheme 162

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO MISFIRE DTCS) Connect a hand-held tester or 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 ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0300, P0301, P0302, P0303 and/or P0304 A "P0300, P0301, P0302, P0303 and/or P0304" and other DTCs B HINT: If any other DTCs besides P0300, P0301, P0302, P0303 and P0304 are output, perform troubleshooting for those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. READ VALUE USING HAND-HELD TESTER(MISFIRE RPM AND MISFIRE LOAD) NOTE: If a hand-held tester is not available, proceed to step 3. Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / MISFIRE RPM and MISFIRE LOAD. Read and note the MISFIRE RPM and the MISFIRE LOAD (engine load) values. HINT: The MISFIRE RPM and MISFIRE LOAD indicate the vehicle conditions under which the misfire occurred. Next: Go to next step.
3. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly, and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
4. CHECK MISFIRE COUNT(CYL #1, #2, #3 AND #4) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Clear DTC (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). If using an OBD II scan tool, go to step 5 . On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / CYL #1, #2, #3 and #4. Allow the engine to idle. Read each value of CYL #1 to #4 displayed on the tester. If no misfire counts occur in any cylinders, perform the following operations: Shift the gear selector lever to the D position. Repeat steps ( d ) and ( f ) above. Check the CYL #1 to #4. If misfire counts are still not displayed, repeat (g) and then check the misfire counts again. Drive the vehicle with the MISFIRE RPM and MISFIRE LOAD noted in step 2 . Read the CYL #1 to #4 or DTCs displayed on the tester. Result: MISFIRE COUNT RESULT Misfire Count Proceed To One or two cylinders have misfire counts A Three cylinders or more have misfire counts B B: Go to step 13 A: Go to next step
5. CHECK SPARK PLUG Remove the cylinder head cover No. 2. Remove the ignition coil and the spark plug of misfire cylinder. Measure the spark plug electrode gap. Standard: Between 0.7 mm and 0.8 mm (0.028 in. and 0.032 in.) Maximum electrode gap: 1.16 mm (0.046 in.) Check the electrode for carbon deposits. Recommended spark plug: SPARK PLUG SPECIFICATION DENSO K16R-U NGK BKR5EYA NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap. NG: REPLACE SPARK PLUG OK: Go to next step.
6. CHECK FOR SPARKS AND IGNITION Disconnect the injector connectors to prevent the engine starting. Install the spark plug to the ignition coil. Attach the spark plug to the cylinder head cover. Crank the engine within 2 seconds and check the spark. OK: Spark jumps across electrode gap Reconnect the injector connectors. NG: Go to step 8 OK: Go to next step.
7. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER (See «ENGINE»(ref-224535-S01176598232006031000000) ) Measure the cylinder compression pressure of the misfiring cylinder. OK: Go to step 9 NG: REPAIR OR REPLACE MALFUNCTION PARTS
8. CHANGE NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Change to a normal spark plug. Perform a spark test. CAUTION: Always disconnect each injector connector. NOTE: Do not crank the engine for more than 2 seconds. Install the spark plug to the ignition coil and connect the ignition coil connector. Disconnect the injector connector. Ground the spark plug. Check if sparks occur while the engine is being cranked. OK: Spark jumps across electrode gap. NG: REPLACE IGNITION COIL NO.1 (See «CYLINDER HEAD ASSY»(ref-224535-S37156053672006031000000) ) THEN CONFIRM THAT THERE IS NO MISFIRE OK: REPLACE SPARK PLUG
9. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#1, #2, #3 AND/OR #4 VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E5 ECM connector. Standard: ECM TERMINAL OF MISFIRING CYLINDER (#1, #2, #3 AND/OR #4 VOLTAGE) Tester Connections Specified Conditions #1 (E5-1) - E01 (E5-7) Between 9 V and 14 V #2 (E5-2) - E01 (E5-7) Between 9 V and 14 V #3 (E5-3) - E01 (E5-7) Between 9 V and 14 V #4 (E5-4) - E01 (E5-7) Between 9 V and 14 V OK: Go to step 11 NG: Go to next step.
10. CHECK HARNESS AND CONNECTOR (INJECTOR - ECM) Disconnect the injector connector (of the misfire cylinder). Disconnect the E5 ECM connector. Turn the ignition switch to ON. Measure the resistance and voltage between the injector and the ECM connector terminals. Standard (Cylinder No. 1): INJECTOR - ECM Tester Connections Specified Conditions I6-1 - Ground Between 11 V and 14 V I6-2 - Ground 10 kohms or higher I6-2 - #1 (E5-1) Below 1 ohms Standard (Cylinder No. 2): TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions I7-1 - Ground Between 11 V and 14 V I7-2 - Ground 10 kohms or higher I7-2 - #2 (E5-2) Below 1 ohms Standard (Cylinder No. 2): TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions I8-1 - Ground Between 11 V and 14 V I8-2 - Ground 10 kohms or higher I8-2 - #3 (E5-3) Below 1 ohms Standard (Cylinder No. 2): TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions I9-1 - Ground Between 11 V and 14 V I-2 - Ground 10 kohms or higher I9-2 - #4 (E5-4) Below 1 ohms Reconnect the injector connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
11. 11 CHECK FUEL INJECTOR OF MISFIRING CYLINDER (See «INSPECTION»(ref-224533-S14983714392006031000000) ) Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor). NG: REPLACE FUEL INJECTOR ASSY OK: Go to next step.
12. CHECK VALVE CLEARANCE OF MISFIRING CYLINDER (See «VALVE CLEARANCE»(ref-224535-S26341689762006031000000) ) NG: ADJUST VALVE CLEARANCE (See «ADJUSTMENT»(ref-224535-S38584494132006031000000) ) OK: Go to next step.
13. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leaks. OK: No leakage from air induction system. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
14. CHECK VALVE TIMING Remove the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). Turn the crankshaft pulley, then align its groove with the timing mark "0" of the timing chain cover. Check that both timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration. If not, turn the crankshaft 1 revolution (360°), then align the marks as above. OK: Point marks on camshaft timing gears are aligned with timing chain cover surface. Reinstall the cylinder head cover (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ). NG: ADJUST VALVE TIMING (See «REPLACEMENT»(ref-224535-S28916890002006031000000) ) OK: Go to next step.
15. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-224533-S39815869062006031000000) ) Check the fuel pressure. NG: CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND FILTER OK: Go to next step.
16. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL (COOLANT TEMP) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP. Read the COOLANT TEMP twice, when the engine is both cold and warmed up. If using an OBD II scan tool, refer to the instruction manual . Standard: With cold engine: Same as ambient air temperature. With warm engine: Between 75°C and 95°C (167°F and 203°F). NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR OK: Go to next step.
17. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL(MAF) Connect the hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / MAF and COOLANT TEMP. Allow the engine to idle until the COOLANT TEMP reaches 75°C (167°F) or more. Read the MAF with the engine in an idling condition and at an engine speed of 2,500 rpm. If using an OBD II scan tool, refer to the instruction manual . Standard: MAF while engine idling: Between 1.4 gm/s and 2.3 gm/s (shift position: N, A/C: OFF). MAF at engine speed of 2,500 rpm: Between 5.4 gm/s and 7.9 gm/s (shift position: N, A/C: OFF). NG: REPLACE MASS AIR FLOW METER OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) )

The knock sensor is fitted on the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, the ignition timing is delayed to suppress it.

Scheme 163

HINT

When DTC P0325 is set, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is retarded to its maximum retardation. Fail-safe mode continues until the ignition switch is turned to OFF.

Reference: Inspection using an oscilloscope.

HINT

The correct waveform is shown on the left.

TERMINAL REFERENCE

Scheme 164

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 HARNESS AND CONNECTOR Disconnect the K1 knock sensor connector. Check the resistance between the knock sensor connector and the body ground. Standard: 1 Mohms or more Reconnect the knock sensor connector. OK: Go to step 3 NG: Go to next step.
2. INSPECT KNOCK SENSOR (See «INSPECTION»(ref-224532-S22009511002006031000000) ) NG: REPLACE KNOCK SENSOR OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (ECM - KNOCK SENSOR) Disconnect the K1 knock sensor connector. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): ECM - KNOCK SENSOR (CHECK FOR OPEN) Tester Connections Specified Conditions Knock sensor (K1-1) - KNK1 (E6-1) Below 1 ohms Standard (Check for short): ECM - KNOCK SENSOR (CHECK FOR SHORT) Tester Connections Specified Conditions Knock sensor (K1-1) or KNK1 (E6-1) - Body ground 10 kohms or higher Reconnect the knock sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
4. CONFIRM THE MALFUNCTION DISAPPEAR WHEN A GOOD KNOCK SENSOR IS INSTALLED Replace the knock sensor with a new knock sensor. Using SST, remove the installed knock sensor. Install the new knock sensor using SST. SST 09816-30010 Torque: 44 N.m (450 kgf.cm, 32.6 ft.lbf) Connect a hand-held tester or OBD II scan tool to the DLC 3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Start the engine and perform a driving test. If using a hand-held tester, select the following menu items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODES. Read DTCs. If using an OBD II scan tool, refer to the instruction manual . Result: DTC OUTPUT RESULT Display (DTC output) Proceed To P0325 A Not output B B: SECURELY REINSTALL SENSOR A: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

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

Scheme 166

Reference: Inspection using an oscilloscope.

HINT

Scheme 167

1. The correct waveform is (Scheme 167)
2. G2+ stands for the Camshaft Position (CMP) sensor signal, and NE+ stands for the CKP sensor signal. TERMINAL REFERENCE Items Contents Terminals CH1: G2 - NE- CH2: NE - NE- Equipment Settings 5V/Division, 20ms/Division Conditions Cranking or idling

HINT

1. If no problem is found by this diagnostic troubleshooting procedure, troubleshoot the engine mechanical systems.
2. Check the engine speed. The engine speed can be checked by using a hand-held tester or OBD II scan tool. To check, follow the operation below: Connect a hand-held tester or OBD II scan tool to the DLC3. Start the engine. Turn the tester or scan tool ON. If using a hand-held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / ENGINE SPD. If using an OBD II scan tool, refer to the instruction manual . The engine speed may be indicated as zero despite the engine revolving normally. This is caused by a lack of NE signals from the Crankshaft Position (CKP) sensor. Alternatively, the engine speed may be indicated as lower than the actual engine speed, if the CKP sensor voltage output is insufficient.
3. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 168

Scheme 169

Scheme 170

Scheme 171

1. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Disconnect the C3 Crankshaft Position (CKP) sensor connector. Measure the resistance between terminals 1 and 2. Standard: CRANKSHAFT POSITION SENSOR (RESISTANCE) Tester Connections Specified Conditions 1 - 2 Between 985 ohms and 1,600 ohms at cold 1 - 2 Between 1,265 ohms. and 1,890 ohms. at hot NOTE: Terms cold and hot refer to the temperature of the coils. Cold means approximately -10° to 50°C (14° to 122°F). Hot means approximately 50° to 100°C (122° to 212°F). Reconnect the CKP sensor connector. NG: REPLACE CRANKSHAFT POSITION SENSOR (See «INSPECTION»(ref-224544-S09838421062006031000000) ) OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the C3 CKP sensor connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): CRANKSHAFT POSITION SENSOR - ECM (CHECK FOR OPEN) Tester connections Specified Conditions NE+ (C3-1) - NE (E5-27) Below 1 ohms NE- (C3-2) - NE- (E5-34) Below 1 ohms. Standard (Check for short): CRANKSHAFT POSITION SENSOR - ECM (CHECK FOR SHORT) Tester connections Specified Conditions NE+ (C3-1) or NE (E5-27) - Body ground 10 kohms or higher NE- (C3-2) or NE- (E5-34) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the CKP sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) Check the CKP sensor installation. OK: Sensor is installed correctly. NG: SECURELY REINSTALL SENSOR OK: Go to next step.
4. CHECK CRANKSHAFT POSITION SENSOR PLATE(TEETH OF SENSOR PLATE) Check the teeth of the sensor plate. OK: Sensor plate does not have any cracks or deformation. NG: REPLACE CRANKSHAFT POSITION SENSOR PLATE OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

The Camshaft Position (CMP) sensor consists of a magnet and an iron core which is wrapped with copper wire, and is installed on the cylinder head. When the camshaft rotates, each of 3 teeth on the camshaft passes through the CMP sensor. This activates the internal magnet in the sensor, generating a voltage in the copper wire. The camshaft rotation is synchronized with the crankshaft rotation. When the crankshaft turns twice the voltage is generated 3 times in the CMP sensor. The generated voltage in the sensor acts as a signal, allowing the ECM to locate the camshaft position. This signal is then used to control ignition timing, fuel injection timing, and the VVT system.

Scheme 172

HINT

1. DTC P0340 indicates a malfunction relating to the CMP sensor (+) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).
2. DTC P0341 indicates a malfunction relating to the CMP sensor (-) circuit (the wire harness between the ECM and CMP sensor, and the CMP sensor itself).

Reference: Inspection using an oscilloscope.

HINT

Scheme 173

1. The correct waveform is (Scheme 173)
2. G2 stands for the CMP sensor signal, and NE stands for the Crankshaft Position (CKP1 sensor signal. TERMINAL REFERENCE Items Contents Terminals CH1: G2 - NE- CH2: NE - NE- Equipment Settings 5V/Division, 20ms/Division Conditions Cranking or idling

HINT

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

Scheme 174

Scheme 175

Scheme 176

Scheme 177

1. INSPECT CAMSHAFT POSITION SENSOR (RESISTANCE) Disconnect the C1 Camshaft Position (CMP) sensor connector. Measure the resistance between terminals 1 and 2. Standard: CAMSHAFT POSITION SENSOR (RESISTANCE) Tester Connections Specified Conditions 1 - 2 Between 1,630 ohms. and 2,740 ohms. at cold 1 - 2 Between 2,065 ohms. and 3,225 ohms. at hot NOTE: Terms cold and hot refer to the temperature of the coils. Cold means approximately -10° to 50°C (14° to 122°F). Hot means approximately 50° to 100°C (122° to 212°F). Reconnect the CMP sensor connector. NG: REPLACE CAMSHAFT POSITION SENSOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM) Disconnect the C1 CMP sensor connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): CAMSHAFT POSITION SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions G+ (C1-1) - G2 (E5-26) Below 1 ohms. G- (C1-2) - NE- (E5-34) Below 1 ohms. Standard (Check for short): CAMSHAFT POSITION SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions G+ (C1 -1) or G2 (E5-26) - Body ground 10 kohms or higher G- (C1-2) or NE- (E5-34) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the CMP sensor connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR) Check the CMP sensor installation. OK: Sensor is installed correctly. NG: SECURELY REINSTALL SENSOR OK: Go to next step.
4. CHECK CAMSHAFT(TEETH OF PLATE) Check the teeth of the camshaft. OK: Camshaft teeth do not have any cracks or deformation. NG: REPLACE CAMSHAFT OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 178

Scheme 179

Scheme 180

Scheme 181

Scheme 182

Scheme 183

Scheme 184

1. CHECK WHETHER PTC OUTPUT RECURS(DTC P0351, P0352, P0353 OR P0354) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Shuffle arrangement of the ignition coils with igniters (among No. 1 to No. 4 cylinders). NOTE: Do not shuffle the connectors. Perform a simulation test. Check DTCs displayed on the tester or scan tool. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0351, P0352, P0353 or P0354 A Any other DTCs B B: REPLACE IGNITION COIL ASSY (See «VALVE CLEARANCE»(ref-224535-S26341689762006031000000) ) A: Go to next step
2. INSPECT ECM (IGT1, IGT2, IGT3, IGT4 AND IGF SIGNAL) Inspect the ECM using an oscilloscope. While cranking or idling, check the waveform between the terminals of the E5 and E6 ECM connector. Standard: ECM (IGT1, IGT2, IGT3, IGT4 AND IGF SIGNAL) Tester Connections Specified Conditions IGT1 (E5-8) - E1 (E6-7) Correct waveform shown IGT2 (E5-9) - E1 (E6-7) Correct waveform shown IGT3 (E5-10) - E1 (E6-7) Correct waveform shown IGT4 (E5-11) - E1 (E6-7) Correct waveform shown IGF (E5-23) - E1 (E6-7) Correct waveform shown NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): IGNITION COIL ASSY - ECM (1 Of 4) Tester Connections Specified Conditions IGF (I2-2) - IGF (E5-23) Below 1 ohms IGF (I3-2) - IGF (E5-23) Below 1 ohms IGF (I4-2) - IGF (E5-23) Below 1 ohms IGF (I5-2) - IGF (E5-23) Below 1 ohms Standard (Check for open): IGNITION COIL ASSY - ECM (2 Of 4) Tester Connections Specified Conditions IGT (I2-3) - IGT1 (E5-8) Below 1 ohms IGT (I3-3) - IGT2 (E5-9) Below 1 ohms IGT (I4-3) - IGT3 (E5-10) Below 1 ohms IGT (I5-3) - IGT4 (E5-11) Below 1 ohms Standard (Check for short): IGNITION COIL ASSY - ECM (3 Of 4) Tester Connections Specified Conditions IGF (I2-2) or IGF (E5-23) - Body ground 10 kohms or higher IGF (I3-2) or IGF (E5-23) - Body ground 10 kohms or higher IGF (I4-2) or IGF (E5-23) - Body ground 10 kohms or higher IGF (I5-2) or IGF (E5-23) - Body ground 10 kohms or higher Standard (Check for short): IGNITION COIL ASSY - ECM (4 Of 4) Tester Connections Specified Conditions IGT (I2-3) or IGT1 (E5-8) - Body ground 10 kohms or higher IGT (I3-3) or IGT2 (E5-9) - Body ground 10 kohms or higher IGT (I4-3) or IGT3 (E5-10) - Body ground 10 kohms or higher IGT (I5-3) or IGT4 (E5-11) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the ignition coil with igniter connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
4. INSPECT IGNITION COIL ASSY (POWER SOURCE) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector. Check the resistance. Standard (Check for open): IGNITION COIL ASSY (POWER SOURCE) (FOR SHORT OPEN) Tester Connections Specified Conditions GND (I1-4) - Body ground Below 1 ohms GND (I2-4) - Body ground GND (I3-4) - Body ground GND (I4-4) - Body ground Turn the ignition switch to ON. Measure the voltage between the terminals of the wire harness side connector. Standard: IGNITION COIL ASSY (POWER SOURCE) Tester Connections Specified Conditions +B (I2-1) - GND (I2-4) Beiween 9 V and 14 V +B (I3-1) - GND (I3-4) Beiween 9 V and 14 V +B (I4-1) - GND (I4-4) Beiween 9 V and 14 V +B (I5-1) - GND (I5-4) Beiween 9 V and 14 V Reconnect the ignition coil with igniter connector. NG: Go to step 5 OK: REPLACE IGNITION COIL ASSY (See «VALVE CLEARANCE»(ref-224535-S26341689762006031000000) )
5. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - IGNITION SWITCH) Disconnect the I2, I3, I4 or I5 ignition coil with igniter connector. Disconnect the I10 ignition switch connector. Check the resistance. Standard (Check for open): IGNITION COIL ASSY - IGNITION SWITCH (CHECK FOR OPEN) Tester Connections Specified Conditions +B (I2-1) - IG2 (I10-6) Below 1 ohms +B (I3-1) - IG2 (I10-6) Below 1 ohms +B (I4-1) - IG2 (I10-6) Below 1 ohms +B (I5-1) - IG2 (I10-6) Below 1 ohms Standard (Check for short): IGNITION COIL ASSY - IGNITION SWITCH (CHECK FOR SHORT) Tester Connections Specified Conditions +B (I2-1) or IG2 (I10-6) - Body ground 10 kohms or higher +B (I3-1) or IG2 (I10-6) - Body ground 10 kohms or higher +B (I4-1) or IG2 (I10-6) - Body ground 10 kohms or higher +B (I5-1) or IG2 (I10-6) - Body ground 10 kohms. or higher Reconnect the ignition coil with igniter connector. Reconnect the ignition switch connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE IGNITION COIL ASSY (See «VALVE CLEARANCE»(ref-224535-S26341689762006031000000) )

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 185

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO PTC P0420) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. DTC OUTPUT RESULT Display (DTC output) Proceed to P0420 A P0420 and other DTCs B HINT: If any DTCs other than P0420 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step.
2. PERFORM ACTIVE TEST USING HAND-HELD TESTER (A/F CONTROL) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Start the engine. Warm up the engine at an engine speed of 2,500 rpm for approximately 90 seconds. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. Perform the A/F CONTROL operation with the engine in an idling condition (press the RIGHT or LEFT button to change the fuel injection volume). Monitor the voltage outputs of the HO2 sensors (O2S B1S1 and OS2 B1S2) displayed on the tester. HINT: The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%. Each sensor reacts in accordance with increases and decreases in the fuel injection volume. Standard: FUEL INJECTION VOLUME STANDARD Tester Display (Sensor) Injection Volumes Status Voltages O2S B1S1 (Front HO2 Sensor) +25 % Rich More than 0.55 O2S B1S1 (Front HO2 Sensor) -12.5 % Lean Less than 0.4 O2S B1S2 (Rear HO2 Sensor) +25 % Rich More than 0.5 O2S B1S2 (Rear HO2 Sensor) -12.5 % Lean Less than 0.4 Result: Lean: During A/F CONTROL, the HO2 sensor (sensors 1 and 2) output voltages are consistently less than 0.4 V. Rich: During A/F CONTROL, the HO2 sensor (sensors 1 and 2) output voltages are consistently more than 0.50 to 0.55 V. B: CHECK AND REPLACE OXYGEN SENSOR (SENSOR 1) C: CHECK AND REPLACE OXYGEN NO.2 SENSOR (SENSOR 2), OR CHECK AND REPAIR EXHAUST GAS LEAKAGE A: Go to next step
3. CHECK FOR EXHAUST GAS LEAKAGE (SEE «REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY»(ref-224538-S23456327792006031000000) ) OK: No gas leakage. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: REPLACE THREE-WAY CATALYTIC CONVERTER (EXHAUST MANIFOLD) NOTE: Replace both the front and rear catalysts (front exhaust pipe). OBD II scan tool (excluding the hand-held tester)

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO PTC P0420) Connect an OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Read DTCs using the scan tool. Result: DTC OUTPUT RESULT Display (DTC output) Proceed to P0420 A P0420 and other DTCs B HINT: If any DTCs other than P0420 are output, troubleshoot those DTCs first. B: GO TO DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) A: Go to next step
2. CHECK FOR EXHAUST GAS LEAKAGE (SEE «REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY»(ref-224538-S23456327792006031000000) ) OK: No gas leakage. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: Go to next step.
3. INSPECT OXYGEN SENSOR(BANK1 SENSOR1) (See «DTC P0130 OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1), DTC P2195 OXYGEN SENSOR SIGNAL STUCK LEAN (BANK1 SENSOR 1), DTC P2196 OXYGEN SENSOR SIGNAL STUCK RICH (BANK1 SENSOR 1)»(ref-224516-S02553862232006031000000) ) NG: REPLACE OXYGEN SENSOR (SENSOR 1) OK: Go to next step.
4. INSPECT OXYGEN NO.2 SENSOR(BANK1 SENSOR2) (See «DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2), DTC P0138 HEATED OXYGEN SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)»(ref-224516-S02023750472006031000000) ) NG: REPLACE OXYGEN NO.2 SENSOR (SENSOR 2) OK: REPLACE THREE-WAY CATALYTIC CONVERTER (FRONT PIPE) NOTE: Replace both the front and rear catalysts (front exhaust pipe).

The vapor pressure sensor, VSV for CCV (Vacuum Switching Valve for Canister Closed Valve), and VSV for EVAP (Evaporative Emission) are used to detect abnormalities in the EVAP control system.

The ECM determines whether there is an abnormality in the EVAP control system based on the vapor pressure sensor signal.

DTCs P0441 and P0446 are set by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 186) below, and when there is a malfunction in either VSV for EVAP and VSV for CCV, or in the vapor pressure sensor itself.

Scheme 186

Scheme 187

Scheme 188

Scheme 189

CONFIRMATION READINESS TEST

First Trip Procedures

Scheme 190

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Scheme 197

1. The engine must be cold, and the ambient temperature must be approximately between 10°C and 35°C (50°F and 95°F).
2. The intake air temperature and the engine coolant temperature are almost equal.
3. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Disconnect the battery terminal or remove the EFI fuse for more than 60 seconds. READINESS TESTS will show INCMPL (incomplete).
4. Drive the vehicle on a freeway. Write down the initial status of the READINESS TESTS. As each Readiness Test passes EVAP evaluation monitors, its status will change to COMPL (complete). This procedure may take approximately 20 minutes or more. NOTE: Do not shut off the engine - the results will be invalid. Pass Condition - No Problem Found by the ECM When the EVAP EVAL shows COMPL, go to the Non-Continuous Tests screen . NOTE: Do not shut off the engine - the results will be invalid. To enter the Non-Continuous Tests screen, go to ENHANCED OBD II, Onboard Tests, Non-continuous Tests . If all of the tests in the Time $02 category show Pass, the EVAP Evaluation Monitor has operated and no problem was detected. Fail Condition - Problem Detected by the ECM If the EVAP EVAL shows INCMPL, go to the Non-Continuous Test screen . If all of the Tests show Pass, the following may have occurred. The EVAP Evaluation Monitor did not operate. The EVAP Evaluation Monitor has not yet been finished. The ECM has not yet finished the judgement process. If one or more of the tests in the Time $02 category show Fail, the EVAP Evaluation Monitor did operate and the ECM has detected a problem. Go to Continuous Tests screen . This is the only place DTC's are listed for the first trip. NOTE: The DTC listed may not be valid. A second trip is needed to confirm the DTC. Second Trip Procedures
5. The engine must be cold, and the ambient temperature must be approximately between 10°C and 35°C (50°F and 95°F).
6. Go to the READINESS TESTS screen.
7. Drive the vehicle on a freeway. Write down the initial status of the READINESS TESTS. This procedure may take approximately 20 minutes or more. NOTE: Do not shut off the engine - the results will be invalid.
8. If the READNESS TESTS change to COMPL, the EVAP evaluation monitor has operated. Check for any stored DTCs. If a DTC was stored, the problem has been detected and confirmed by the ECM. If no DTC was found, the EVAP monitor operated but no problem was detected.

HINT

1. If any of DTC P0441, P0446 or P0451 are set simultaneously with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.
3. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Hand-held tester

Scheme 198

Scheme 199

Scheme 200

Scheme 201

Scheme 202

Scheme 203

Scheme 204

Scheme 205

Scheme 206

1. CHECK FOR EVAPORATIVE EMISSION LEAK Check whether any hoses close to the fuel tank have been modified, and check if there are any signs of accidents and damage near the fuel tank and the charcoal canister. Check the following parts and components for cracks, deformation and loose connections: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around the fuel tank and charcoal canister NG: REPAIR OR REPLACE OK: Go to next step.
2. INSPECT FUEL TANK CAP ASSY (CHECK THAT FUEL TANK GENUINE PARTS) NG: REPLACE TO GENUINE PARTS OK: Go to next step.
3. CHECK THAT FUEL TANK CAP CORRECTLY INSTALLED NG: CORRECTLY INSTALL FUEL TANK CAP OK: Go to next step.
4. INSPECT FUEL TANK CAP ASSY (See «ON-VEHICLE INSPECTION»(ref-224534-S40131610082006031000000) ) NG: REPLACE FUEL TANK CAP ASSY OK: Go to next step.
5. CHECK FILLER NECK FOR DAMAGE Remove the fuel tank cap. Visually check the fuel inlet pipe for damage. Reinstall the fuel tank cap. NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY OK: Go to next step.
6. CHECK HOSES AND TUBES (VAPOR PRESSURE SENSOR - FUEL TANK) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, and blockages. NG: REPAIR OR REPLACE HOSES AND TUBES OK: Go to next step.
7. CHECK HOSES AND TUBES (FUEL TANK - CHARCOAL CANISTER) Check the connections between the fuel tank and fuel EVAP (Evaporative Emission) pipe, fuel EVAP pipe and under-floor fuel tube, and under-floor fuel tube and charcoal canister. Check the hose and tube for cracks, holes damage and blockages. NG: REPAIR OR REPLACE HOSES AND TUBES OK: Go to next step.
8. CHECK EACH CONNECTOR FOR LOOSENESS AND DISCONNECTION (VSV FOR EVAP, VSV FOR CCV AND VAPOR PRESSURE SENSOR) NG: REPAIR OR CONNECT VSV AND SENSOR CONNECTOR OK: Go to next step.
9. CHECK VACUUM HOSES((9), (10) AND (11) IN (Scheme 186) IN CIRCUIT DESCRIPTION) Check that the vacuum hoses are connected correctly. Check the vacuum hoses for looseness and disconnection. Check the vacuum hoses for cracks, holes, damage and blockages. NG: REPAIR OR REPLACE OK: Go to next step.
10. INSPECT ECM (VC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E5 ECM connector. Standard: ECM (VC VOLTAGE) Tester Connections Specified Conditions VC (E5-18) - E2 (E5-28) Between 4.5 V and 5.5 V NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
11. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Standard (1): ECM (PTNK VOLTAGE) - STANDARD (1) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) Between 2.9 V and 3.7 V NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg). Using a MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg) to the vapor pressure sensor. Standard (2): ECM (PTNK VOLTAGE) - STANDARD (2) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) 0.5 V or less Reinstall the vapor pressure sensor. OK: Go to step 13 NG: Go to next step.
12. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the V3 vapor pressure sensor connector. Disconnect the E3 and E5 ECM connectors. Check the resistance. Standard (Check for open): VAPOR PRESSURE SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions PTNK (V3-2) - PTNK (E3-21) Below 1 ohms GND (V3-1) - E2 (E5-28) Below 1 ohms VCC (V3-3) - VC (E5-18) Below 1 ohms Standard (Check for short): VAPOR PRESSURE SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions PTNK (V3-2) or PTNK (E3-21) - Body ground 10 kohms or higher VCC (V3-3) or VC (E5-18) - Body ground 10 kohms or higher Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE VAPOR PRESSURE SENSOR ASSY
13. PERFORM ACTIVE TEST USING HAND-HELD TESTER (VSV FOR EVAP PURGE FLOW) Disconnect the vacuum hose of the VSV (Vacuum Switch Valve) for EVAP from the charcoal canister. Connect a hand-held tester to the DLC3. Start the engine and turn the tester ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (press the right or left button). Use your finger to check whether the disconnected hose has suction when the EVAP VSV is turned ON. OK: VSV FOR EVAP PURGE FLOW Tester Operations Specified Conditions EVAP VSV: ON Suction applied to your finger EVAP VSV: OFF No suction applied to your finger Reconnect the vacuum hose. OK: Go to step 17 NG: Go to next step.
14. CHECK VACUUM HOSES (INTAKE MANIFOLD - VSV FOR EVAP, VSV FOR EVAP - CHARCOAL CANISTER) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose and disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, and blockages. NG: REPAIR OR REPLACE OK: Go to next step.
15. CHECK OPERATION OF VSV FOR EVAP (See «INSPECTION»(ref-224534-S17717337462006031000000) ) NG: REPLACE VSV AND CLEAN VACUUM HOSES, AND THEN CHECK CHARCOAL CANISTER OK: Go to next step.
16. CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY) Disconnect the V1 VSV for EVAP connector. Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Measure the voltage between the terminal of the V1 VSV for EVAP connector and body ground. Standard: VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY (1 OF 3) Tester Connections Specified Conditions VSV for EVAP (V1-1) - Body ground Between 9 V and 14 V On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (press the right or left button). Measure the voltage between the specified terminals of the V1 VSV for EVAP connector twice, when the EVAP VSV is turn ON and OFF using the tester. Standard: VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY (2 OF 3) Tester Operations Tester Connections Specified Conditions EVAP VSV: ON VSV for EVAP: (V1-1) - (V1-2) Between 9 V to 14V EVAP VSV: OFF VSV for EVAP: (V1-1) - (V1-2) 0 V Turn the ignition switch to OFF. Check the resistance. Standard: VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY (3 OF 3) Tester Connections Specified Conditions VSV for EVAP (V1-1) - Body ground 10 ohms or higher VSV for EVAP (V1-2) - Body ground Reconnect the VSV for EVAP connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
17. PERFORM ACTIVE TEST USING HAND-HELD TESTER (VSV FOR CCV) Remove the VSV for CCV (Canister Closed Valve). Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / CAN CTRL VSV (press the right or left button). Check the VSV for CCV operation, when it is turned ON and OFF using the tester. OK: VSV FOR CCV Tester Operations Specified Conditions CCV VSV: ON Air does not flow from ports E to F CCV VSV: OFF Air from port E flows out through port F Reinstall the VSV for CCV. OK: Go to step 21 NG: Go to next step.
18. CHECK VACUUM HOSES(VSV FOR CCV - CHARCOAL CANISTER) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose and disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, and blockage. NG: REPAIR OR REPLACE OK: Go to next step.
19. CHECK OPERATION OF VSV FOR CCV (See «INSPECTION»(ref-224534-S17717337462006031000000) ) NG: REPLACE VSV AND CLEAN VACUUM HOSES, AND THEN CHECK CHARCOAL CANISTER OK: Go to next step.
20. CHECK HARNESS AND CONNECTOR (VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY) Disconnect the V4 VSV for CCV connector. Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Measure the voltage between the terminal of the V4 VSV for CCV connector and body ground. Standard: VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY (1 OF 3) Tester Connections Specified Conditions VSV for CCV (V4-2) - Body ground Between 9 V and 14 V On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / CAN CTRL VSV (press the right or left button). Measure the voltage between the specified terminals of the V4 VSV for CCV connector twice, when the VSV for CCV is turned ON and OFF, using the tester. Standard: VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY (2 OF 3) Tester Operations Tester Connections Specified Conditions CCV VSV: ON VSV for CCV: (V4-1) - (V4-2) Between 9 V and 14 V CCV VSV: OFF VSV for CCV: (V4-1) - (V4-2) 0 V Turn the ignition switch to OFF. Check the resistance. Standard: VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY (3 OF 3) Tester Connections Specified Conditions VSV for CCV (V4-1) - Body ground 10 ohms or higher VSV for CCV (V4-2) - Body ground Reconnect the VSV for CCV connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
21. 21 INSPECT FUEL TANK ASSY(CRACKS AND DAMAGE) NG: REPLACE FUEL TANK ASSY OK: Go to next step.
22. INSPECT CHARCOAL CANISTER ASSY(CRACKS AND DAMAGE) NG: REPLACE CHARCOAL CANISTER ASSY OK: Go to next step.
23. INSPECT CHARCOAL CANISTER ASSY (See «INSPECTION»(ref-224534-S17717337462006031000000) ) NG: REPLACE CHARCOAL CANISTER ASSY OK: Go to next step.
24. CHECK FUEL TANK OVER FILL CHECK VALVE NG: REPLACE FUEL TANK OVER FILL CHECK VALVE OR FUEL TANK OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

OBD II scan tool (excluding the hand-held tester)

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Scheme 218

Scheme 219

1. CHECK FOR EVAPORATIVE EMISSION LEAK Check whether any hoses close to the fuel tank have been modified, and check if there are any signs of accidents and damage near the fuel tank and the charcoal canister. Check the following parts and components for cracks, deformation and loose connections: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around the fuel tank and charcoal canister NG: REPAIR OR REPLACE OK: Go to next step.
2. INSPECT FUEL TANK CAP ASSY(CHECK THAT FUEL TANK GENUINE PARTS) NG: REPLACE TO GENUINE PARTS OK: Go to next step.
3. CHECK THAT FUEL TANK CAP CORRECTLY INSTALLED NG: CORRECTLY INSTALL FUEL TANK CAP OK: Go to next step.
4. INSPECT FUEL TANK CAP ASSY (See «ON-VEHICLE INSPECTION»(ref-224534-S40131610082006031000000) ) NG: REPLACE FUEL TANK CAP ASSY OK: Go to next step.
5. CHECK FILLER NECK FOR DAMAGE NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY OK: Go to next step.
6. CHECK EACH CONNECTOR FOR LOOSENESS AND DISCONNECTION(VSV FOR EVAP, VSV FOR CCV AND VAPOR PRESSURE SENSOR) NG: REPAIR OR CONNECT VSV AND SENSOR CONNECTOR OK: Go to next step.
7. CHECK VACUUM HOSES((9), (10) AND (11) IN (Scheme 186) CIRCUIT DESCRIPTION) Check that the vacuum hoses are connected correctly. Check the vacuum hoses for looseness and disconnection. Check the vacuum hoses for cracks, holes, damage and blockages. NG: REPAIR OR REPLACE OK: Go to next step.
8. INSPECT ECM (VC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E5 ECM connector. Standard: ECM (VC VOLTAGE) Tester Connections Specified Conditions VC (E5-18) - E2 (E5-28) Between 4.5 V and 5.5 V NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
9. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Remove the vapor pressure sensor. Standard (1): ECM (PTNK VOLTAGE) - STANDARD 1 Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) Between 2.9 V and 3.7 V Using a 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). Standard (2): ECM (PTNK VOLTAGE) - STANDARD (2) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) 0.5 V or less Reinstall the vapor pressure sensor. OK: Go to step 11 NG: Go to next step.
10. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the V3 vapor pressure sensor connector. Disconnect the E3 and E5 ECM connectors. Check the resistance. Standard (Check for open): VAPOR PRESSURE SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions PTNK (V3-2) - PTNK (E3-21) Below 1 ohms GND (V3-1) - E2 (E5-28) VCC (V3-3) - VC (E5-18) Standard (Check for short): VAPOR PRESSURE SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions PTNK (V3-2) or PTNK (E3-21) - Body ground 10 kohms or higher VCC (V3-3) or VC (E5-18) - Body ground Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE VAPOR PRESSURE SENSOR ASSY
11. INSPECT DUTY VACUUM SWITCHING VALVE (FUNCTION OF VSV FOR EVAP) Remove the VSV for EVAP. Turn the ignition switch to ON. Check the VSV function. Connect terminal PRG (E5-12) of the ECM connector and the body ground (VSV for EVAP should be OPEN, i.e. ON). OK (1): Air from port E flows out through port F. Disconnect between terminal PRG of the ECM connector and the body ground (VSV for EVAP should CLOSED, i.e. OFF). OK (2): Air does not flow from port E to port F. Reinstall the VSV for EVAP. OK: Go to step 14 NG: Go to next step.
12. CHECK OPERATION OF VSV FOR EVAP (See «INSPECTION»(ref-224534-S17717337462006031000000) ) NG: REPLACE VSV AND CLEAN VACUUM HOSES, AND THEN CHECK CHARCOAL CANISTER OK: Go to next step.
13. CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY) Check the harness and the connector between the VSV for EVAP connector and the ECM connector. Disconnect the V1 VSV for EVAP connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): VSV FOR EVAP - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions VSV for EVAP (V1-1) - PRG (E5-12) Below 1 ohms Standard (Check for short): VSV FOR EVAP - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions VSV for EVAP (V1-1) or PRG (E5-12) - Body ground 10 kohms or higher Reconnect the VSV for EVAP connector. Reconnect the ECM connector. Check the harness and the connector between the VSV for EVAP connector and the EFI relay. Disconnect the V1 VSV for EVAP connector. Remove the EFI relay from the engine room R/B. Check the resistance. Standard (Check for open): VSV FOR EVAP - EFI RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions VSV for EVAP (V1-2) - EFI relay (3) Below 1 ohms Standard (Check for short): VSV FOR EVAP - EFI RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions VSV for EVAP (V1-2) or EFI relay (3) - Body ground 10 kohms or higher Reconnect the VSV for EVAP connector. Reinstall the EFI relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
14. INSPECT VSV FOR CCV (FUNCTION OF VSV FOR CCV) Remove the VSV for CCV. Turn the ignition switch to ON. Check the VSV function. Connect terminal CCV (E4-1) of the ECM connector and the body ground (VSV for CCV should be CLOSED, i.e. ON). OK (1): Air does not flow from port E to port F. Disconnect between terminal CCV of the ECM connector and the body ground (VSV for CCV should be OPEN, i.e. OFF). OK (2): Air from port E flows out through port F. Reinstall the VSV for CCV. OK: Go to step 17 NG: Go to next step.
15. CHECK OPERATION OF VSV FOR CCV (See «INSPECTION»(ref-224534-S17717337462006031000000) ) NG: REPLACE VSV AND CLEAN VACUUM HOSES, AND THEN CHECK CHARCOAL CANISTER OK: Go to next step.
16. CHECK HARNESS AND CONNECTOR (VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY) Check the harness and the connector between the VSV for CCV connector and the ECM connector. Disconnect the V4 VSV for CCV connector. Disconnect the E4 ECM connector. Check the resistance. Standard (Check for open): VSV FOR CCV - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions VSV for CCV (V4-2) - CCV (E4-1) Below 1 ohms Standard (Check for short): VSV FOR CCV - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions VSV for CCV (V4-2) or CCV (E4-1) - Body ground 10 kohms or higher Reconnect the VSV for CCV connector. Reconnect the ECM connector. Check the harness and the connector between the VSV for CCV connector and the EFI relay. Disconnect the V4 VSV for CCV connector. Remove the EFI relay from the engine room R/B. Check the resistance. Standard (Check for open): VSV FOR CCV - EFI RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions VSV for CCV (V4-1) - EFI relay (3) Below 1 ohms Standard (Check for short): VSV FOR CCV - EFI RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions VSV for CCV (V4-1) or EFI relay (3) - Body ground 10 kohms or higher Reconnect the VSV for CCV connector. Reinstall the EFI relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
17. CHECK FUEL TANK OVER FILL CHECK VALVE NG: REPLACE FUEL TANK OVER FILL CHECK VALVE OR FUEL TANK OK: CHECK AND REPLACE CHARCOAL CANISTER ASSY

The vapor pressure sensor and the VSV for CCV (Canister Closed Valve) are used to detect abnormalities in the EVAP (Evaporative Emission) control system. The ECM determines whether there is an abnormality in the EVAP control system based on the vapor pressure sensor signal.

DTC P0442 or P0456 is set by the ECM when evaporative emissions leak from the components within the dotted line in (Scheme 220) below, and when the vapor pressure sensor malfunctions.

Scheme 220

Scheme 221

Scheme 222

HINT

1. If any of DTC P0441, P0446 or P0451 are set simultaneously with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tightened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not sure if it was loose, troubleshoot according to the following procedure.
3. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.
4. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 223

Scheme 224

Scheme 225

Scheme 226

Scheme 227

1. CHECK FOR EVAPORATIVE EMISSION LEAK Check whether any hoses close to the fuel tank have been modified, and check if there are any signs of accidents and damage near the fuel tank and the charcoal canister. Check the following parts and components for cracks, deformation and loose connections: 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.
2. INSPECT FUEL TANK CAP ASSY (CHECK THAT FUEL TANK GENUINE PARTS) NG: REPLACE TO GENUINE PARTS OK: Go to next step.
3. CHECK THAT FUEL TANK CAP CORRECTLY INSTALLED NG: CORRECTLY INSTALL FUEL TANK CAP OK: Go to next step.
4. INSPECT FUEL TANK CAP ASSY (See «ON-VEHICLE INSPECTION»(ref-224534-S40131610082006031000000) ) NG: REPLACE FUEL TANK CAP ASSY OK: Go to next step.
5. CHECK FILLER NECK FOR DAMAGE NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY OK: Go to next step.
6. CHECK HOSES AND TUBES (VAPOR PRESSURE SENSOR - FUEL TANK) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose and disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, and blockages. NG: REPAIR OR REPLACE HOSES AND TUBES OK: Go to next step.
7. CHECK HOSES AND TUBES (FUEL TANK - CHARCOAL CANISTER) Check the connections between the fuel tank and fuel EVAP pipe, fuel EVAP pipe and under-floor fuel tube, and under-floor fuel tube and charcoal canister. Check the hoses and tubes for cracks, holes, damage, and blockages. NG: REPAIR OR REPLACE HOSES AND TUBES OK: Go to next step.
8. INSPECT CHARCOAL CANISTER ASSY (CRACKS AND DAMAGE) NG: REPLACE CHARCOAL CANISTER ASSY OK: Go to next step.
9. INSPECT ECM(VC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the specified terminals of the E5 ECM connector. Standard: TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions VC (E5-18) - E2 (E5-28) Between 4.5 V and 5.5 V NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
10. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Remove the vapor pressure sensor. Standard (1): ECM (PTNK VOLTAGE) - STANDARD (1) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) Between 2.9 V and 3.7 V Using a 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). Standard (2): ECM (PTNK VOLTAGE) - STANDARD (2) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) 0.5 V or less Reinstall the vapor pressure sensor. OK: Go to step 12 NG: Go to next step.
11. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the V3 vapor pressure sensor connector. Disconnect the E3 and E5 ECM connectors. Check the resistance. Standard (Check for open): VAPOR PRESSURE SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions PTNK (V3-2) - PTNK (E3-21) Below 1 ohms GND (V3-1) - E2 (E5-28) VCC (V3-3) - VC (E5-18) Standard (Check for short): VAPOR PRESSURE SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions PTNK (V3-2) or PTNK (E3-21) - Body ground 10 kohms or higher VCC (V3-3) or VC (E5-18) - Body ground Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE VAPOR PRESSURE SENSOR ASSY
12. 12 CHECK FUEL TANK OVER FILL CHECK VALVE NG: REPLACE FUEL TANK OVER FILL CHECK VALVE OR FUEL TANK OK: IT IS LIKELY THAT FUEL TANK CAP WAS NOT CLOSED PROPERLY

The vapor pressure sensor, VSV for CCV (Vacuum Switching Valve for Canister Closed Valve) and VSV for EVAP (Evaporative Emission) are used to detect abnormalities in the EVAP control system.

The ECM determines whether there is an abnormality in the EVAP control system based on the vapor pressure sensor signal.

Scheme 228

Scheme 229

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. If any of DTC P0441, P0446 or P0451 are set simultaneously with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446 or P0451. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
3. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

Scheme 230

Scheme 231

Scheme 232

Scheme 233

1. INSPECT ECM (VC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E5 ECM connector. Standard: ECM (VC VOLTAGE) Tester Connections Specified Conditions VC (E5-18) - E2 (E5-28) Between 4.5 V and 5.5 V NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
2. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Remove the vapor pressure sensor. Standard (1): ECM (PTNK VOLTAGE) - STANDARD (1) Tester Connections Specified Conditions PTNK (E3-21) - E2 (E5-28) Between 2.9 V and 3.7 V Using a 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). Standard (2): ECM (PTNK VOLTAGE) - STANDARD (2) Tester Connections Specified Conditions PTNK(E3-21) - E2 (E5-28) 0.5 V or less Reinstall the vapor pressure sensor. NG: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the V3 vapor pressure sensor connector. Disconnect the E3 and E5 ECM connectors. Check the resistance. Standard (Check for open): VAPOR PRESSURE SENSOR - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions PTNK (V3-2) - PTNK (E3-21) Below 1 ohms GND (V3-1) - E2 (E5-28) VCC (V3-3) - VC (E5-18) Standard (Check for short): VAPOR PRESSURE SENSOR - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions PTNK (V3-2) or PTNK (E3-21) - Body ground 10 kohms or higher VCC (V3-3) or VC (E5-18) - Body ground Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE VAPOR PRESSURE SENSOR ASSY

Vehicles, which are equipped with ABS (Anti-Lock Brake System), detect the vehicle speed using the skid control ECU and wheel speed sensor. The wheel speed sensor monitors the wheel rotation speed and sends a signal to the skid control ECU. The skid control ECU converts the wheel speed signal into a 4-pulse signal and transmits it to the ECM via the combination meter. The ECM determines the vehicle speed based on the frequency of the pulse signal.

Scheme 234

Scheme 235

HINT

Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 236

Scheme 237

1. CHECK OPERATION OF SPEEDOMETER Drive the vehicle and check if the operation of the speedometer in the combination meter is normal. HINT: The vehicle speed sensor is operating normally if the speedometer reading is normal. NG: CHECK SPEEDOMETER CIRCUIT (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-224528-S20737354612006031000000) ) OK: Go to next step.
2. INSPECT ECM (SPD VOLTAGE) Shift the transmission gear selector lever to the neutral position. Jack up the vehicle. Turn the ignition switch to ON. Check the voltage between the terminals of the E4 and E6 ECM connectors as the wheel is turned slowly. Standard: ECM (SPD VOLTAGE) Tester Connections Specified Conditions SPD (E4-17) - E1 (E6-7) Voltage generated intermittently HINT: The output voltage should fluctuate up and down similarly to (Scheme 237) when the wheel is turned slowly. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

The Idle Air Control (IAC) valve, of a rotary solenoid type, is located under the throttle body. Intake air, bypassing the throttle valve, flows into the IAC valve through a passage.

The valve regulates the volume of intake air that bypasses the throttle valve and allows the engine idling speed to be controlled.

The IAC valve is used by the ECM to perform idle-up and its feedback signal is used as one factor in target engine idling speed regulation.

Scheme 238

Scheme 239

Scheme 240

The IAC valve controls the volume of air that bypasses the throttle valve.

Idling speed is determined by the volume of air that passes through the Intake Air Control (IAC) valve. When the volume is large, the idling speed increases. Conversely, when it is small, the idling speed decreases, the ECM sends a duty signal to the IAC valve and drives the IAC valve motor to regulate this air volume. If any of the following conditions apply, the ECM determines that the IAC system is malfunctioning, and illuminates the MIL and sets a DTC. The actual engine idling speed does not reach the target idling speed, the IAC learned valve angle remains at the maximum or minimum, or the duty ratio signal to the IAC valve is stuck.

Example

The ECM sets DTC P0505 if either of the following conditions applies

1. The difference between the actual and target engine idling speeds exceeds 200* rpm while the engine idles, and this occurs 5 times.
2. The IAC learned valve angle remains at the maximum or minimum for 5 seconds.

The ECM sets DTC P0511 (open/short circuit) if the following condition applies

1. The duty ratio signal to the IAC valve is stuck at 0% or 100%.

*: The threshold varies according to engine load.

HINT

1. When the throttle position is slightly opened (the accelerator pedal is slightly depressed) because a floor carpet is overlapped on the accelerator pedal, or if not fully releasing the accelerator pedal, etc., DTC P505 will possibly be detected.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 241

Scheme 242

Scheme 243

1. CHECK ANY OTHER DTCS OUTPUT(IN ADDITION TO PTC P0505) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read DTCs. Result: DTC OUTPUT RESULT Display (DTC Output) Proceed To P0505 A P0511 and other DTCs B B: Go to step 7 . A: Go to next step.
2. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
3. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK: No leakage from air induction system. NG: REPAIR OR REPLACE OK: Go to next step.
4. PERFORM ACTIVE TEST USING HAND-HELD TESTER (CHECK IAC VALVE OPERATION) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Start the engine and warm it up to the normal operating temperature. Switch off all the accessories (where on). Switch off A/C (where on). Move the gear selector lever to the N position. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / IAC DUTY RATIO. Check that the engine speed varies when the Idle Air Control (IAC) duty ratio is changed using the tester. OK: Engine speed fluctuates according to IAC duty ratio variation. OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) NG: Go to next step
5. CHECK A/C SIGNAL CIRCUIT NG: REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step.
6. CHECK FOR BLOCKAGE IN IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE NG: REPLACE IDLE AIR CONTROL VALVE OK: Go to next step.
7. CHECK HARNESS AND CONNECTOR (BATTERY - IAC VALVE, IAC VALVE - BODY GROUND) Disconnect the I1 IAC valve connector. Turn the ignition switch to ON. Measure the voltage between the terminals of the IAC valve wire harness side connector. Standard: BATTERY - IAC VALVE, IAC VALVE - BODY GROUND Tester Connections Specified Conditions VISC (I1-2) - GND (I1-3) between 9 V and 14 V Reconnect the IAC valve connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
8. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) Disconnect the I1 IAC valve connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): IAC VALVE - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions DUTY (I1-1) - RSD (E5-5) Below 1 ohms GND (I1-3) - E01 (E5-7) Below 1 ohms Standard (Check for short): IAC VALVE - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions DUTY (I1-1) or RSD (E3-5) - Body ground 10 kohms or higher Reconnect the ECM connector. Reconnect the IAC valve connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
9. INSPECT IDLE AIR CONTROL VALVE (See «ON-VEHICLE INSPECTION»(ref-224532-S19945189112006031000000) ) NG: REPLACE IDLE AIR CONTROL VALVE OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

OBD II scan tool (excluding the hand-held tester)

Scheme 244

Scheme 245

Scheme 246

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO PTC P0505) Connect an OBD II scan tool to the DLC3. Turn the ignition switch to ON and turn the scan tool ON. Read DTCs using the scan tool. Result: DTC OUTPUT RESULT Display (DTC output) Proceed To P0505 A P0511 and other DTCs B B: Go to step 6 A: Go to next step
2. CHECK PCV HOSE CONNECTIONS OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
3. CHECK AIR INDUCTION SYSTEM Check the air induction system for vacuum leakage. OK: No leakage from air induction system. NG: REPAIR OR REPLACE OK: Go to next step.
4. CHECK A/C SIGNAL CIRCUIT NG: REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA OK: Go to next step.
5. CHECK FOR BLOCKAGE IN IAC VALVE AND PASSAGE TO BYPASS THROTTLE VALVE NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (BATTERY - IAC VALVE, IAC VALVE - BODY GROUND) Disconnect the I1 Idle Air Control (IAC) valve connector. Turn the ignition switch to ON. Measure the voltage between the terminals of the IAC valve wire harness side connector. Standard: BATTERY - IAC VALVE, IAC VALVE - BODY GROUND Tester Connections Specified Conditions VISC (I1-2) - GND (I1-3) Between 9 V and 14 V Reconnect the IAC valve connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
7. CHECK HARNESS AND CONNECTOR (IAC VALVE - ECM) Disconnect the I1 IAC valve connector. Disconnect the E5 ECM connector. Check the resistance. Standard (Check for open): IAC VALVE - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions DUTY (I1-1) - RSD (E5-5) Below 1 ohms GND (I1-3) - E01 (E5-7) Below 1 ohms Standard (Check for short): IAC VALVE - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions DUTY (I1-1) or RSD (E5-5) - Body around 10 kohms or higher Reconnect the ECM connector. Reconnect the IAC valve connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
8. INSPECT IDLE AIR CONTROL VALVE (See «ON-VEHICLE INSPECTION»(ref-224532-S19945189112006031000000) ) NG: REPAIR OR REPLACE IDLE AIR CONTROL VALVE OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

The power steering oil pressure sensor is turned ON when a power steering wheel load occurs by turning the steering wheel. The ECM regulates the engine idling RPM according to the voltage output of the sensor.

Scheme 247

Scheme 248

HINT

1. If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 249

Scheme 250

1. CHECK POWER STEERING OIL PRESSURE SENSOR Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the tester or scan tool ON. Start the engine. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / PS SIGNAL. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . OK: POWER STEERING OIL PRESSURE SENSOR CONDITION Conditions Power steering oil pressure sensor Steering wheel lock ON In an idle OFF OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (ECM - POWER STEERING OIL PRESSURE SENSOR) Disconnect the E5 and E6 ECM connectors. Disconnect the P1 power steering oil pressure sensor connector. Check the resistance. Standard (Check for open): ECM - POWER STEERING OIL PRESSURE SENSOR (CHECK FOR OPEN) Specified Tester Connections Conditions VOUT (P1-2) - PSP (E6-29) Below 1 ohms VC (P1-3) - VC (E5-18) GND (P1-1) - E2 (E5-28) Standard (Check for short): ECM - POWER STEERING OIL PRESSURE SENSOR (CHECK FOR SHORT) Tester Connections Specified Conditions VOUT (P1-2) or PSP (E6-29) - Body ground 10 kohms or higher GND (P1-1) or E2 (E5-28) - Body around Reconnect the power steering oil pressure sensor connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE POWER STEERING OIL PRESSURE SENSOR

HINT

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

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1. CHECK FUSE (EFI FUSE) Remove the EFI fuse from the engine room R/B. Check the resistance. Standard: Below 1 ohms Reinstall the EFI fuse. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step.
2. INSPECT ECM (BATT VOLTAGE) Measure the voltage between the terminals of the E3 and E6 ECM connectors. Standard: ECM (BATT VOLTAGE) Tester Connections Specified Conditions BATT (E3-3) - E1 (E6-7) Between 9 V and 14 V NG: Go to step 3 OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
3. CHECK HARNESS AND CONNECTOR (ECM - EFI FUSE, EFI FUSE - BATTERY) Check the harness and the connector between the EFI fuse and ECM. Remove the EFI fuse from the engine room R/B. Disconnect the E3 ECM connector. Check the resistance. Standard (Check for open): ECM - EFI FUSE (CHECK FOR OPEN) Tester Connections Specified Conditions EFI fuse (2) - BATT (E3-3) Below 1 ohms Standard (Check for short): ECM - EFI FUSE (CHECK FOR SHORT) Tester Connections Specified Conditions EFI fuse (2) or BATT (E6-3) - Body ground 10 kohms or higher Reconnect the ECM connector. Reinstall the EFI fuse. Check the harness and the connector between the EFI fuse and battery. Remove the EFI fuse from the engine room R/B. Disconnect the positive battery terminal. Check the resistance. Standard (Check for open): EFI FUSE - BATTERY (CHECK FOR OPEN) Tester Connections Specified Conditions Battery positive terminal - EFI fuse (1) Below 1 ohms Standard (Check for short): EFI FUSE - BATTERY (CHECK FOR SHORT) Tester Connections Specified Conditions Battery positive terminal or EFI fuse (1) - Body ground 10 kohms or higher Reconnect the positive battery terminal. Reinstall the EFI fuse. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
4. INSPECT BATTERY Check that the battery is not depleted. NG: REPLACE BATTERY OK: CHECK AND REPLACE ENGINE ROOM RELAY BLOCK

HINT

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

REPLACE ECM (See REPLACEMENT )

HINT

1. The following troubleshooting flowchart is based on the premise that the engine is cranked normally. If the engine will not crank, proceed to the problem symptoms table in «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000) .
2. Read freeze frame data using a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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

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1. READ VALUE USING HAND-HELD TESTER (STARTER SIGNAL) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. Check the value displayed on the tester when the ignition switch is turned to the ON and START positions. OK: IGNITION SWITCH POSITIONS Ignition Switch Positions ON START STARTER SIG OFF ON OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step.
2. INSPECT PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Inspect the Park/Neutral Position (PNP) switch. (For A/T models) Disconnect the A3 PNP switch connector. Check the resistance when the transmission gear selector lever is moved to each position. Standard: PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Gear Selector Lever Positions Tester Connections Specified Conditions P 1 - 3, 6 - 9 Below 1 ohms R 2 - 3 Below 1 ohms N 3 - 5, 6 - 9 Below 1 ohms D 3 - 7 Below 1 ohms 2 3 - 4 Below 1 ohms L 3 - 8 Below 1 ohms Reconnect the PNP switch connector. Inspect the clutch start switch. (For M/T models) Disconnect the C5 clutch start switch connector. Check the resistance when the clutch start switch is ON and OFF. Standard: PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Ignition Switch Positions Tester Connections Specified Conditions ON (pushed) 1 - 2 Below 1 ohms OFF (free) 1 - 2 10 kohms or higher Reconnect the clutch start switch connector. NG: REPLACE PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH (GO TO STEP 3 AFTER REPLACEMENT) OK: Go to next step.
3. READ VALUE USING HAND-HELD TESTER (STARTER SIGNAL) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. Check the value displayed on the tester when the ignition switch is turned to the ON and START positions. OK: IGNITION SWITCH POSITIONS Ignition Switch Positions ON START STARTER SIG OFF ON OK: SYSTEM OK NG: Go to next step
4. INSPECT IGNITION OR STARTER SWITCH ASSY Disconnect the I10 ignition switch connector. Check the resistance. IGNITION OR STARTER SWITCH ASSY Switch Position Tester Connection Specified Condition LOCK All Terminals 10 kohms or higher ACC 1-3 Below 1 ohms ON 1-2, 1-3, 2-3, 5-6 Below 1 ohms START 1-2, 4-5, 4-6, 5-6 Below 1 ohms Reconnect the ignition switch connector. NG: REPLACE IGNITION OR STARTER SWITCH ASSY (GO TO STEP 5 AFTER REPLACEMENT OK: Go to next step.
5. READ VALUE USING HAND-HELD TESTER(STARTER SIGNAL) Connect the hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STARTER SIG. Check the value displayed on the tester when the ignition switch is turned to the ON and START positions. Result: IGNITION SWITCH POSITIONS Ignition Switch Positions ON START STARTER SIG OFF ON OK: SYSTEM OK NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OBD II scan tool (excluding the hand-held tester)

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1. INSPECT ECM (STA VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E6 ECM connector. Standard: ECM (STA VOLTAGE) Tester Connection Specified Condition STA (E6-9) - E1 (E6-7) 0 V Measure the voltage between the terminals of the E6 ECM connector when the engine is cranked. Standard: ECM (STA VOLTAGE) Tester Connections Specified Condition STA (E6-9) - E1 (E6-7) 5.5 V or more OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step.
2. INSPECT PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Inspect the Park/Neutral Position (PNP) switch. (For A/T models) Disconnect the A3 PNP switch connector. Check the resistance when the transmission gear selector lever is moved to each position. Standard: PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Shift Range Tester Connection Specified Condition P 1 - 3, 6 - 9 Below 1 ohms R 2 - 3 Below 1 ohms N 3 - 5, 6 - 9 Below 1 ohms D 3 - 7 Below 1 ohms 2 3-4 Below 1 ohms L 3 - 8 Below 1 ohms Reconnect the PNP switch connector Inspect the clutch start switch. (For M/T models) Disconnect the C5 clutch start switch connector. Check the resistance when the clutch start switch is ON and OFF. Standard: PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH Ignition Switch Positions Tester Connections Specified Conditions ON (pushed) 1 - 2 Below 1 ohms OFF (free) 1 - 2 10 kohms or higher Reconnect the clutch start switch connector. NG: REPLACE PARK/NEUTRAL POSITION SWITCH OR CLUTCH START SWITCH (GO TO STEP 3 AFTER REPLACEMENT) OK: Go to next step.
3. INSPECT ECM (STA VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E6 ECM connector. Standard: ECM (STA VOLTAGE) Tester Connections Specified Conditions STA (E6-9) - E1 (E6-7) 0V Measure the voltage between the terminals of the E6 ECM connector when the engine is cranked. Standard: TESTER CONNECTIONS RESISTANCE SPECIFIED CONDITION Tester Connections Specified Conditions STA (E6-9) - E1 (E6-7) 5.5 V or more OK: SYSTEM OK NG: Go to next step
4. INSPECT IGNITION OR STARTER SWITCH ASSY Disconnect the I10 ignition switch connector. Check the resistance. IGNITION OR STARTER SWITCH ASSY Ignition Switch Positions Tester Connections Specified Conditions LOCK All Terminals 10 kohms or higher ACC 1-3 Below 1 ohms ON 1-2, 1-3, 2-3, 5-6 Below 1 ohms START 1-2, 4-5, 4-6, 5-6 Below 1 ohms Reconnect the ignition switch connector. NG: REPLACE IGNITION OR STARTER SWITCH ASSY (GO TO STEP 5 AFTER REPLACEMENT) OK: Go to next step.
5. INSPECT ECM (STA VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E6 ECM connector. Standard: ECM (STA VOLTAGE) (E6 ECM CONNECTOR) Tester Connections Specified Conditions STA (E6-9) - E1 (E6-7) 0V Measure the voltage between the terminals of the E6 ECM connector when the engine is cranked. Standard: ECM (STA VOLTAGE) (E6 ECM CONNECTOR WHEN ENGINE IS CRANKED) Tester Connections Specified Conditions STA (E6-9) - E1 (E6-7) 5.5 V or more OK: SYSTEM OK NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

When the ignition switch is turned to ON, the positive battery voltage is applied to the coil, which closes the contacts of the EFI main relay (Marked: EFI) and supplies power to terminal +B of the ECM.

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

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1. INSPECT ECM (+B VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E6 ECM connectors. Standard: ECM (+B VOLTAGE) Tester Connections Specified Conditions +B (E3-1) - E1 (E6-7) Between 9 V and 14 V OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step
2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) Disconnect the negative battery cable. Disconnect the E6 ECM connector. Check the resistance. Standard (Check for open): ECM - BODY GROUND (CHECK FOR OPEN) Tester Connections Specified Conditions E1 (E6-7) - Body ground Below 1 ohms Reconnect the ECM connector. Reconnect the negative battery cable. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. INSPECT IGNITION OR STARTER SWITCH ASSY Disconnect the I10 ignition switch connector. Check the resistance. IGNITION OR STARTER SWITCH ASSY Ignition Switch Positions Tester Connections Specified Conditions LOCK All Terminals 10 kohms or higher ACC 1-3 Below 1 ohms ON 1-2, 1-3, 2-3, 5-6 Below 1 ohms START 4-5, 4-6, 5-6, 1-2 Below 1 ohms Reconnect the ignition switch connector. NG: REPLACE IGNITION OR STARTER SWITCH ASSY OK: Go to next step.
4. CHECK FUSE (EFI FUSE) Remove the EFI fuse from the engine room R/B. Check the EFI fuse resistance. Standard: Below 1 ohms Reinstall the EFI fuse. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step.
5. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Check the EFI relay resistance. Standard: EFI RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (When battery voltage applied to terminals 1 and 2) Reinstall the EFI relay. NG: REPLACE EFI RELAY OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) Check the harness and connector between the EFI relay and ECM. Remove the EFI relay from the engine room R/B. Disconnect the E3 ECM connector. Check the resistance. Standard (Check for open): EFI RELAY - ECM, EFI RELAY - BODY GROUND (CHECK FOR OPEN) Tester Connections Specified Conditions EFI relay (3)-+B (E3-1) Below 1 ohms Standard (Check for short): EFI RELAY - ECM, EFI RELAY - BODY GROUND (CHECK FOR SHORT) Tester Connections Specified Conditions EFI relay (3) or +B (E3-1) - Body ground 10 kohms or higher Reinstall the EFI relay. Reconnect the ECM connector. Check the harness and connector between the EFI relay and body ground. Remove the EFI relay from the engine room R/B. Check the resistance. Standard (Check for open): EFI RELAY - BODY GROUND (CHECK FOR OPEN) Tester Connections Specified Conditions EFI relay (1) - Body ground Below 1 ohms Reinstall the EFI relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
7. CHECK FUSE (AM2 FUSE) Remove the AM2 fuse from the engine room R/B. Check the AM2 fuse resistance. Standard: Below 1 ohms Reinstall the AM2 fuse. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE OK: Go to next step.
8. CHECK HARNESS AND CONNECTOR (EFI RELAY - EFI FUSE) Remove the EFI relay from the engine room R/B. Remove the EFI fuse from the engine room R/B. Check the resistance. Standard (Check for open): EFI RELAY - EFI FUSE Tester Connections Specified Conditions EFI relay (5) - EFI fuse (2) Below 1 ohms Standard (Check for short): EFI RELAY - EFI FUSE Tester Connections Specified Conditions EFI relay (5) - EFI fuse (2) - Body ground 10 kohms or higher Reinstall the EFI relay. Reinstall the EFI fuse. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
9. CHECK HARNESS AND CONNECTOR (EFI RELAY - IGNITION SWITCH) Remove the EFI relay from the engine room R/B. Disconnect the I10 ignition switch connector. Check the resistance. Standard (Check for open): EFI RELAY - IGNITION SWITCH (CHECK FOR OPEN) Tester Connections Specified conditions IG2 (I10-6) - EFI relay (2) Below 1 ohms Standard (Check for short): EFI RELAY - IGNITION SWITCH (CHECK FOR SHORT) Tester Connections Specified conditions IG2 (I10-6) or EFI relay (2) - Body ground 10 kohms or higher Reinstall the EFI relay. Reconnect the ignition switch connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
10. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - AM2 FUSE) Disconnect the I10 ignition switch connector. Remove the AM2 fuse from the engine room R/B. Check the resistance. Standard (Check for open): IGNITION SWITCH - AM2 FUSE (CHECK FOR OPEN) Tester Connections Specified conditions AM2 (I10-5) - AM2fuse (2) Below 1 ohms Standard (Check for short): IGNITION SWITCH - AM2 FUSE (CHECK FOR SHORT) Tester Connections Specified conditions AM2 (I10-5) - AM2fuse (2) - Body ground 10kohms or higher Reconnect the ignition switch connector. Reinstall the AM2 fuse. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: CHECK AND REPAIR HARNESS AND CONNECTOR (AM2 FUSE - POSITIVE BATTERY TERMINAL, EFI FUSE - POSITIVE BATTERY TERMINAL)

When the engine is cranked, a current flows from terminal ST2 of the ignition switch into the ST (starter) relay coil and a current also flows into terminal STA of the ECM (STA signal).

When the STA and NE signals are received by the ECM, TR (power transistor) is switched on, allowing a current to flow into the circuit opening relay coil. The circuit opening relay switches on, power is supplied to the fuel pump and the fuel pump operates.

While the NE signal is being generated (engine running), the ECM keeps TR ON, therefore keeping the circuit opening relay ON, so that the fuel pump continues to operate.

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Hand-held tester

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1. PERFORM ACTIVE TEST USING HAND-HELD TESTER (OPERATION OF CIRCUIT OPENING RELAY) Connect a hand-held tester to the DLC3. Turn the ignition switch to ON and turn the tester ON. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/ SPD. Check whether operating sounds can be heard while operating the relay using the tester. OK: Operating sounds can be heard from relay. OK: Go to step 7 . NG: Go to next step.
2. INSPECT ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-224516-S01199847272006031000000) ) NG: REPAIR OR REPLACE POWER SOURCE CIRCUIT OK: Go to next step.
3. INSPECT CIRCUIT OPENING RELAY Remove the circuit opening relay from the instrument panel J/B. Check the circuit opening relay resistance. Standard: CIRCUIT OPENING RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage applied to terminals 1 and 2) Reinstall the circuit opening relay. NG: REPLACE CIRCUIT OPENING RELAY OK: Go to next step.
4. INSPECT ECM (FC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Standard: ECM (FC VOLTAGE) Tester Connections Specified Conditions FC (E3-10) - E01 (E5-7) Between 9 V and 14 V OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step
5. CHECK HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) Remove the EFI relay from the engine room R/B. Remove the circuit opening relay from the instrument panel J/B. Check the resistance. Standard (Check for open): EFI RELAY - CIRCUIT OPENING RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions EFI relay (3) - Circuit opening relay (1) Below 1 ohms EFI relay (3) - Circuit opening relay (5) Below 1 ohms Standard (Check for short): EFI RELAY - CIRCUIT OPENING RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions EFI relay (3) or Circuit opening relay (1) - Body ground 10 kohms or higher EFI relay (3) or Circuit opening relay (5) - Body ground 10 kohms or higher Reinstall the EFI relay. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) Disconnect the E3 ECM connector. Remove the circuit opening relay from the instrument panel J/B. Check the resistance. Standard (Check for open): ECM - CIRCUIT OPENING RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions FC (E3-10) - Instrument panel J/B (Circuit opening relay terminal 2) Below 1 ohms Standard (Check for short): ECM - CIRCUIT OPENING RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions FC (E3-10) or Instrument panel J/B (Circuit opening relay terminal 2) 10 kohms or higher Reconnect the ECM connector. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
7. INSPECT FUEL PUMP ASSY (See «INSPECTION»(ref-224533-S14983714392006031000000) ) NG: REPLACE FUEL PUMP ASSY (See «REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY»(ref-224533-S28624486032006031000000) ) OK: Go to next step.
8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) Remove the circuit opening relay from the instrument panel J/B. Disconnect the F14 fuel pump connector. Check the resistance. Standard (Check for Open): CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND (CHECK FOR OPEN) Tester Connections Specified Conditions Instrument panel J/B (Circuit opening relay terminal 3) - Fuel pump (F14-4) Below 1 ohms Fuel pump (F14-5) - Body ground Below 1 ohms Standard (Check for short): CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND (CHECK FOR SHORT) Tester Connections Specified Conditions Instrument panel J/B (Circuit opening relay terminal 3) or Fuel pump (F14-4) - Body ground 10 kohms or higher Reconnect the fuel pump connector. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

OBD II scan tool (excluding the hand-held tester)

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1. CHECK OPERATION OF FUEL PUMP Turn the ignition switch to ON. Connect terminals FC and E01 of the ECM connector. Check for fuel pressure in the fuel inlet hose when it is pinched off. Result: There is pressure in fuel inlet hose. HINT: At this time, operating sounds can be heard from the fuel pump. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-224516-S32767397082006031000000) ) NG: Go to next step.
2. INSPECT ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-224516-S01199847272006031000000) ) NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT OK: Go to next step.
3. INSPECT CIRCUIT OPENING RELAY Remove the circuit opening relay from the instrument panel J/B. Check the circuit opening relay resistance. Standard: CIRCUIT OPENING RELAY Tester Connections Specified Conditions 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage applied to terminals 1 and 2) Reinstall the circuit opening relay. NG: REPLACE CIRCUIT OPENING RELAY OK: Go to next step.
4. INSPECT ECM (FC VOLTAGE) Turn the ignition switch to ON. Measure the voltage between the terminals of the E3 and E5 ECM connectors. Standard: ECM (FC VOLTAGE) Tester Connections Specified Conditions FC (E3-10) - E01 (E5-7) Between 9 V and 14 V OK: REPLACE ECM (SEE «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: Go to next step
5. CHECK HARNESS AND CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) Remove the EFI relay from the engine room R/B. Remove the circuit opening relay from the instrument panel J/B. Check the resistance. Standard (Check for open): EFI RELAY - CIRCUIT OPENING RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions EFI relay (3) - Circuit opening relay (1) Below 1 ohms EFI relay (3) - Circuit opening relay (5) Below 1 ohms Standard (Check for short): EFI RELAY - CIRCUIT OPENING RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions EFI relay (3) or Circuit opening relay (1) - Body ground 10 kohms or higher EFI relay (3) or Circuit opening relay (5) - Body ground 10 kohms or higher Reinstall the EFI relay. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
6. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) Disconnect the E3 ECM connector. Remove the circuit opening relay from the instrument panel J/B. Check the resistance. Standard (Check for Open): ECM - CIRCUIT OPENING RELAY (CHECK FOR OPEN) Tester Connections Specified Conditions FC (E3-10) - Instrument panel J/B (Circuit opening relay terminal 2) Below 1 ohms Standard (Check for short): ECM - CIRCUIT OPENING RELAY (CHECK FOR SHORT) Tester Connections Specified Conditions FC (E3-10) or Instrument panel J/B (Circuit opening relay terminal 2) - Body Ground 10 kohms or higher Reconnect the ECM connector. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )
7. INSPECT FUEL PUMP ASSY (See «INSPECTION»(ref-224533-S14983714392006031000000) ) NG: REPLACE FUEL PUMP ASSY (See «REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY»(ref-224533-S28624486032006031000000) ) OK: Go to next step.
8. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) Remove the circuit opening relay from the instrument panel J/B. Disconnect the F14 fuel pump connector. Check the resistance. Standard (Check for open): CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND (CHECK FOR OPEN) Tester Connections Specified Conditions Instrument panel J/B (Circuit opening relay terminal 3) - Fuel pump (F14-4) Below 1 ohms Fuel pump (F14-5) - Body ground Below 1 ohms Standard (Check for short): CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND (CHECK FOR SHORT) Tester Connections Specified Conditions Instrument panel J/B (Circuit opening relay terminal 3) or higher Fuel pump (F14-4) - Body ground 10 kohms or higher Reconnect the fuel pump connector. Reinstall the circuit opening relay. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

When the brake pedal is depressed, the stop lamp switch turns on and transmits an STP signal to the ECM. Upon receipt of the STP signal, the ECM determines that the brakes have been applied. The signal voltage level is the same as that of the voltage which is applied to the stop lamps. In addition, the STP signal is used to control the fuel cut-off engine speed. Therefore, the fuel cut-off engine speed, is slightly reduced when the vehicle is braking.

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1. CHECK OPERATION OF STOP LAMP Check whether the stop lamps turn on and off normally when the brake pedal is depressed and released. OK: Stop lamps turn ON when brake pedal is depressed. NG: REPAIR OR REPLACE STOP LAMP SWITCH CIRCUIT OK: Go to next step.
2. READ VALUE USING HAND-HELD TESTER OR OBD II SCAN TOOL (STP SIGNAL AND ST1- VOLTAGE) Connect a hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON. On the tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / STOP LIGHT SW. Read the value displayed on the tester. If using an OBD II scan tool, refer to the instruction manual . Standard: STP SIGNAL AND ST1- VOLTAGE Brake Pedal Operations Specified Conditions Depressed STP Signal ON Released STP Signal OFF OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-224516-S28750937892006031000000) ) NG: Go to next step
3. INSPECT STOP LAMP SWITCH ASSY Check the resistance when the stop lamp switch is ON and OFF. Standard: STOP LAMP SWITCH ASSY Switch Positions Tester Connections Specified Conditions ON (Free) 1 - 2 Below 1 ohms OFF (Pushed in) 1 - 2 10 kohms or higher NG: REPLACE STOP LAMP SWITCH ASSY OK: Go to next step.
4. CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH - ECM) Disconnect the S8 stop lamp switch connector. Disconnect the E4 ECM connector. Check the resistance. Standard (Check for open): STOP LAMP SWITCH - ECM (CHECK FOR OPEN) Tester Connections Specified Conditions Stop lamp switch (S8-1) - STP (E4-19) Below 1 ohms Standard (Check for short): STOP LAMP SWITCH - ECM (CHECK FOR SHORT) Tester Connections Specified Conditions Stop lamp switch (S8-1) or STP (E4-19) - Body ground 10 kohms or higher Reconnect the stop lamp switch connector. Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) )

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM.

By turning the ignition switch to ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually: When the ignition switch is first turned to ON, the MIL should be illuminated and should then turn OFF. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using a hand-held tester or OBD II scan tool.

Scheme 303

HINT

Troubleshoot each trouble symptom in accordance with TROUBLESHOOTING SYMPTOM CHART .

TROUBLESHOOTING SYMPTOM CHART

Scheme 304

1. CHECK WHETHER MIL TURNS OFF Connect hand-held tester or OBD II scan tool to the DLC3. Turn the ignition switch to ON. Turn the tester or scan tool ON Check whether any DTCs have been stored (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Note them down if necessary. Clear DTCs (see «DTC CHECK/CLEAR»(ref-224516-S34313455932006031000000) ). Check if the MIL turns off. Standard: MIL should turn off. OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-224516-S21173080532006031000000) ) NG: Go to next step
2. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E3 ECM connector. Turn the ignition switch to ON. Check that MIL is not illuminated. Standard: MIL is not illuminated Reconnect the ECM connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-224532-S35163313352006031000000) ) NG: CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)
3. CHECK THAT MIL IS ILLUMINATED Check if the MIL is illuminated when the ignition switch is turned to ON. Standard: MIL should be illuminated. OK: SYSTEM OK NG: Go to next step.
4. INSPECT COMBINATION METER ASSY (MIL CIRCUIT) See the combination meter troubleshooting procedure (see «PROBLEM SYMPTOMS TABLE»(ref-224528-S07928367572006031000000) ). NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY OK: CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)