Sfi System - Diagnosis: Diagnosis — Lexus LS III рестайлинг (2003-2006)

BASIC INSPECTION

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

Scheme 122

Scheme 122: BASIC INSPECTION

CHECK BATTERY VOLTAGE NOTE: Carry out this check with the engine stopped and ignition switch OFF. NG: CHARGE OR REPLACE BATTERY OK: Go to next step.
CHECK IF ENGINE WILL CRANK NG: PROCEED TO PROBLEM SYMPTOMS TABLE. See «PROBLEM SYMPTOMS TABLE»(ref-209347-S16229319672005120900000) OK: Go to next step.
CHECK IF ENGINE STARTS NG: Go to step 6 OK: Go to next step.
CHECK AIR FILTER Visually check that the air filter is not excessively dirty or oily. NG: REPLACE AIR FILTER OK: Go to next step.
CHECK IDLE SPEED (See «INSPECTION»(ref-209391-S24650181782005121000000) ) NG: PROCEED TO PROBLEM SYMPTOMS TABLE. See «PROBLEM SYMPTOMS TABLE»(ref-209347-S16229319672005120900000) . OK: Go to next step. PROCEED TO PROBLEM SYMPTOMS TABLE. See «PROBLEM SYMPTOMS TABLE»(ref-209347-S16229319672005120900000) .
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: PROCEED TO «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) AND CONTINUE TO TROUBLESHOOT OK: Go to next step.
CHECK FOR SPARK (See «ON-VEHICLE INSPECTION»(ref-209414-S21476511922005121000000) ) NG: PROCEED TO «ON-VEHICLE INSPECTION»(ref-209414-S21476511922005121000000) AND CONTINUE TO TROUBLESHOOT OK: Go to next step PROCEED TO PROBLEM SYMPTOMS TABLE. See «PROBLEM SYMPTOMS TABLE»(ref-209347-S16229319672005120900000) .

DIAGNOSTIC TROUBLE CODE TABLE

HINT

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

If a DTC is displayed, check the trouble area for the DTC listed in the table.

DTC	Description
DTC P0010	CAMSHAFT POSITION "A" ACTUATOR CIRCUIT (BANK 1), DTC P0020 CAMSHAFT POSITION "A" ACTUATOR CIRCUIT (BANK 2)
DTC P0011, P0012, P0021, P0022	CAMSHAFT POSITION "A" - TIMING OVER-ADVANCED OR SYSTEM PERFORMANCE (BANK 1)
DTC P0016, P0018	CRANKSHAFT POSITION - CAMSHAFT POSITION CORRELATION (BANK 1 SENSOR A)
DTC P0031, P0032, P0037, P0038, P0051, P0052, P0057, P0058	OXYGEN SENSOR HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)
DTC P0100, P0102, P0103	MASS OR VOLUME AIR FLOW CIRCUIT
DTC P0101	MASS OR VOLUME AIR FLOW CIRCUIT RANGE/PERFORMANCE PROBLEM
DTC P0110, P0112, P0113	INTAKE AIR TEMPERATURE CIRCUIT
DTC P0115	ENGINE COOLANT TEMPERATURE CIRCUIT, DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT LOW INPUT, DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT
DTC P0116	ENGINE COOLANT TEMP. CIRCUIT RANGE/PERFORMANCE PROBLEM
DTC P0120, P0122, P0123, P0220, P0222, P0223, P2135	THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT
DTC P0121	THROTTLE PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE PROBLEM
DTC P0125	INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL
DTC P0128	COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)
DTC P0130, 0150, 2195, 2196	OXYGEN SENSOR CIRCUIT (BANK 1 SENSOR 1)
DTC P0133, P0153	OXYGEN SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)
DTC P0134, P0154	HEATED OXYGEN SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)
DTC P0136, P0156	OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2)
DTC P0171, DTC P0172, DTC P0175	SYSTEM TOO LEAN (FUEL TRIM) (BANK 1)
DTC P0230	FUEL PUMP PRIMARY CIRCUIT
DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308	RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED CYLINDER 1 MISFIRE DETECTED
DTC P0325, P0327, P0328, P0330, P0332, P033	KNOCK SENSOR 1 CIRCUIT (BANK 1 OR SINGLE SENSOR)
DTC P0335, P0339	CRANKSHAFT POSITION SENSOR "A" CIRCUIT
DTC P0340, P0341, P0345, P0346	CAMSHAFT POSITION SENSOR "A" CIRCUIT (BANK 1 OR SINGLE SENSOR)
DTC P0351, P0352, P0353, P0354, P0355, P0356, P0357, P0358	IGNITION COIL "A" PRIMARY CIRCUIT
DTC P0420, P0430	CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 1)
DTC P0441, P0442, P0446, P0455, P0456, P2418	EVAPORATIVE EMISSION CONTROL SYSTEM INCORRECT PURGE FLOW
DTC P0451, P0452, P0453	EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR RANGE/PERFORMANCE
DTC P0500, P0503	VEHICLE SPEED SENSOR "A"
DTC P0504	BRAKE SWITCH "A"/"B" CORRELATION, DTC P0571 BRAKE SWITCH "A" CIRCUIT
DTC P0505	IDLE AIR CONTROL SYSTEM
DTC P0560	SYSTEM VOLTAGE
DTC P0604, P0606, P0607, P0657	INTERNAL CONTROL MODULE RANDOM ACCESS MEMORY (RAM) ERROR
DTC P0617	STARTER RELAY CIRCUIT HIGH
DTC P1340, P1341	CAMSHAFT POSITION SENSOR "A" (BANK 1 SENSOR 2)
DTC P2102, P2103	THROTTLE ACTUATOR CONTROL MOTOR CIRCUIT LOW
DTC P2111, P2112	THROTTLE ACTUATOR CONTROL SYSTEM - STUCK OPEN
DTC P2118	THROTTLE ACTUATOR CONTROL MOTOR CURRENT RANGE/PERFORMANCE
DTC P2119	THROTTLE ACTUATOR CONTROL THROTTLE BODY RANGE/PERFORMANCE
DTC P2120, P2122, P2123, P2125, P2127, P2128, P2138	THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT
DTC P2121	THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT RANGE/PERFORMANCE
DTC U0001	HIGH SPEED CAN COMMUNICATION CIRCUIT

DTC

For more DTC information (Scheme 124)through see scheme 84.

*: MIL flashes while catalyst-deterioration-misfire is detected

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INSPECTION PROCEDURE

HINT

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

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Scheme 130: INSPECTION PROCEDURE

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PERFORM ACTIVE TEST (OCV OPERATION) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Start the engine and warm it up. Turn ON the ignition switch and the hand-held tester main switch. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VVT CTRL B1 (VVT CTRL B2). Operate the OCV and check the engine condition at idling. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NG: Go to next step.
CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) (OPERATION) Disconnect the C2 or C3 OCV connector. Apply battery positive voltage between the terminals of the OCV. Check the engine speed. OK: Rough idle or engine stalled Reconnect the OCV connector. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) OK: Go to next step.
INSPECT ECM (OCV SIGNAL) During idling, check the waveform of the ECM using the oscilloscope. OK: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (OCV - ECM) Disconnect the C2 or C3 OCV connector. Disconnect the E5 or E4 ECM connector. Measure the resistance between the wire harness side connectors. Standard: Reconnect the OCV connectors. Reconnect the ECM connectors. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) )

HINT

Note. DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in the engine oil enters the system. These codes will stay even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.

Scheme 137

Scheme 137: INSPECTION PROCEDURE

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PERFORM ACTIVE TEST (OCV OPERATION) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Start the engine and warm it up. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ VVT CTRL B1 (or VVT CTRL B2). Using the hand-held tester, operate the OCV and check the engine speed. Standard: NG: Go to step 4 . OK: Go to next step.
PERFORM ACTIVE TEST (OCV OPERATION) Enter the following menus: ACTIVE TEST / VVT B1 or VVT B2. Change the VVT B1 and VVT B2 values to a value between - 100 % to 100 %. HINT: VVT B1 and VVT B2 values should be added to the current OCV duty ratio. Confirm the current VVT angle by checking VVT CHNG ANGL#1 and VVT CHNG ANGL#2. OK: Operation of VVT B1 or VVT B2 leads to an immediate, linear change in the VVT angle. NOTE: With the engine idling and with advanced camshaft timing (VVT B1 or VVT B2 has a value of 0 % to 100%), engine revolutions will be rough or the engine will stall. When the vehicle is being driven, if the engine is turned off or the throttle valve is open, this ACTIVE TEST will automatically be canceled. NG: Go to step 4 . OK: Go to next step.
CHECK IF DTC OUTPUTS REOCCUR Select check mode. Start and warm up the engine. Drive the vehicle for 10 minutes or more. Read DTC. OK: No DTC output. OK: END NG: Go to next step.
CHECK VALVE TIMING Remove the engine cover. Remove the drive belt. Remove the timing belt cover LH and RH. Turn the crankshaft to align the matchmarks of the crankshaft. Align the notch of the crankshaft pulley to the "0" position. Confirm whether the camshaft pulley's matchmark and the matchmark of the cylinder head cover face each other. Turn the crankshaft clockwise by 360° if these do not face each other. Confirm whether or not these face each other once again. OK: The matchmarks of the camshaft pulley and the cylinder head cover face each other when the notch of the crankshaft pulley is in the "0" position. NG: ADJUST VALVE TIMING (See «TIMING BELT»(ref-209391-S10462282172005121000000) ) OK: Go to next step.
CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) Measure the resistance between the terminals of the OCV. Standard: 6.9 to 7.9 ohm at 20°C (68°F) Remove the OCV. Apply battery positive voltage to terminal 1 and battery negative voltage to terminal 2. Check the valve operation. OK: The valve moves quickly. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) OK: Go to next step.
CHECK OIL CONTROL VALVE FILTER Remove the cylinder head cover. Remove the camshaft bearing cap and the OCV filter. Check that the filter is not clogged. OK: The filter is not clogged. NG: CLEAN OIL CONTROL VALVE FILTER OK: Go to next step. REPLACE VVT ACTUATOR (See «REPLACEMENT»(ref-209391-S14715843932005121000000) and «REPLACEMENT»(ref-209391-S09002787942005121000000) ) After replacing the camshaft timing gear, check the DTC. Clear the DTC and select check mode. Start and warm up the engine. Drive the vehicle for 10 minutes or more. Read DTC and check no DTC set.

Scheme 141

Scheme 141: CIRCUIT DESCRIPTION

HINT

Scheme 142

Scheme 142: INSPECTION PROCEDURE

CHECK VALVE TIMING Remove the engine cover. Remove the drive belt. Remove the timing belt cover LH and RH. Turn the crankshaft to align the matchmarks of the crankshaft. Align the notch of the crankshaft pulley to the "0" position. Confirm whether the camshaft pulley's matchmark and the matchmark of the cylinder head cover face each other. Turn the crankshaft clockwise by 360° if these do not face each other. Confirm whether or not these face each other once again. OK: The matchmarks of the camshaft pulley and the cylinder head cover face each other when the notch of the crankshaft pulley is in the "0" position. NG: ADJUST VALVE TIMING (See «TIMING BELT»(ref-209391-S10462282172005121000000) ) OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

HINT

Read freeze frame data using hand-held tester, as freeze frame data records the engine conditions v a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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Scheme 143: INSPECTION PROCEDURE

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INSPECT HEATED OXYGEN SENSOR (HT1A, HT2A, HT1B, HT2B VOLTAGE) Disconnect the H9, H10, H19 or H20 HO2S connector. Measure the resistance between the terminals of the HO2S connector. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT RELAY (EFI MAIN) Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance in the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
INSPECT ECM (HT1A, HT2A, HT1B, HT2B VOLTAGE) Turn the ignition switch ON. Measure the voltage of the ECM. Standard: OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) NG: Go to next step.
CHECK WIRE HARNESS Check the wire harness between the ECM and HO2S. Disconnect the H9, H10, H19 or H20 HO2S connector. Disconnect the E2, E4 or E6 ECM connector. Measure the resistance of the wire harness side connectors. Standard: Check the wire harness between the HO2S and EFI MAIN relay. Disconnect the H9, H10, H19 or H20 HO2S connector. Remove the EFI MAIN relay from the engine room R/B. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

CIRCUIT DESCRIPTION

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

By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire and an internal thermistor, 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. The ECM interprets this voltage as the intake air amount. The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.

Scheme 154

Scheme 154: CIRCUIT DESCRIPTION

Scheme 155

HINT

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

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Scheme 156: INSPECTION PROCEDURE

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READ VALUE OF HAND-HELD TESTER (MASS AIR FLOW RATE) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect to the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ MAF. Allow the engine to idle. Read the MAF. Result: B: Go to step 6 . C: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step.
CHECK MAF METER (POWER SOUCE VOLTAGE) Turn the ignition switch ON. Disconnect the M1 MAF meter connector. Measure the voltage between the terminal of the wire harness side connector and the body ground. Standard: NG: Go to step 5 . OK: Go to next step.
INSPECT ECM (VG VOLTAGE) Start the engine. Measure the voltage between the specified terminals of the E4 ECM connector. HINT: The shift lever position should be P or N and the A/C switch should be turned OFF. Standard: OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) NG: Go to next step.
CHECK WIRE HARNESS (MAF METER - ECM) Disconnect the M1 MAF meter connector. Disconnect the E4 ECM connector. Measure the resistance between the wire harness connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE MAF METER
CHECK WIRE HARNESS (MAF METER - EFI MAIN RELAY) Disconnect the M1 MAF meter connector. Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. INSPECT ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-209347-S32118634772005120900000) )
INSPECT ECM (SENSOR GROUND) Measure the resistance of the ECM. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (MAF METER - ECM) Disconnect the M1 MAF meter connector. Disconnect the E4 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE MAF METER

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

Scheme 172

Scheme 172: CIRCUIT DESCRIPTION

HINT

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

Scheme 173

Scheme 173: INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101) Result: HINT: If any other codes besides P0101 are output, perform the troubleshooting for those codes first. B: REPLACE MAF meter A: Go to next step. GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) )

The Intake Air Temperature (IAT) sensor, mounted on the Mass Air Flow (MAF) meter, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the intake air temperature. When the intake air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal (Scheme 175)

The IAT sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the IAT sensor from terminal THA via resistor R.

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

Scheme 174

Scheme 174: CIRCUIT DESCRIPTION

Scheme 175

HINT

Confirm the IAT using the hand-held tester. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ INTAKE AIR.

Scheme 176

HINT

If DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.

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

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READ VALUE OF HAND-HELD TESTER (INTAKE AIR TEMPERATURE) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ INTAKE AIR. Read the INTAKE AIR value. Result: HINT: If there is an open circuit, the hand-held tester should indicate -40°C (-40°F). If there is a short circuit, the hand-held tester should indicate 140°C (284°F) or more. B: Go to step 4 . C: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the M1 MAF meter connector. Connect terminals THA and E2 of the MAF meter harness side connector. Turn the ignition switch ON. Read the INTAKE AIR value. Standard: 140°C (284°F) or more OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE MAF METER NG: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR OPEN IN ECM) Disconnect the M1 MAF meter connector. Connect terminals THA of the E4 ECM connector and E2 of the E5 ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM connector. Turn the ignition switch ON. Read the INTAKE AIR value. Standard: 140°C (284°F) or more NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step. REPAIR OR REPLACE HARNESS AND CONNECTOR
READ VALUE OF HAND-HELD TESTER (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the M1 MAF meter connector. Turn the ignition switch ON. Read the INTAKE AIR value. Standard: -40°C (-40°F) OK: REPLACE MAF METER NG: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR SHORT IN HARNESS OR ECM Disconnect the M1 MAF meter connector. Disconnect the E4 and E5 ECM connector. Turn the ignition switch ON. Read the INTAKE AIR value. Standard: -40°C (-40°F) Reconnect the ECM connector. Reconnect the MAF meter connector. NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step. REPAIR OR REPLACE HARNESS AND CONNECTOR

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

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

HINT

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

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Scheme 185: CIRCUIT DESCRIPTION

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HINT

Confirm the ECT using the hand-held tester. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ COOLANT TEMP.

Scheme 187

HINT

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

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READ VALUE OF HAND-HELD TESTER (ENGINE COOLANT TEMPERATURE) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL/COOLANT TEMP. Read the COOLANT TEMP value. Standard: Same value as the actual ECT. Result: HINT: If there is an open circuit, the hand-held tester indicates -40°C (-40°F). If there is a short circuit, the hand-held tester 140°C (284°F) or more. B: Go to step 4 . C: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the E7 ECT sensor connector. Connect terminals 1 and 2 of the ECT sensor wire harness side connector. Turn the ignition switch ON. Read the COOLANT TEMP value. Standard: 140°C (284°F) or more OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ECT SENSOR NG: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR OPEN IN ECM) Disconnect the E7 ECT sensor connector. Connect terminals THW of the E4 ECM cnnector and E2 of the E5 ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM connector. Turn the ignition switch ON. Read the COOLANT TEMP value. Standard: 140°C (284°F) or more NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM OK: Go to next step. REPAIR OR REPLACE HARNESS AND CONNECTOR
READ VALUE OF HAND-HELD TESTER (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E7 ECT sensor connector. Turn the ignition switch ON. Read the COOLANT TEMP value. Standard: -40°C (-40°F) OK: REPLACE ECT SENSOR NG: Go to next step.
READ VALUE OF HAND-HELD TESTER (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E7 ECT sensor connector. Disconnect the E4 and E5 ECM connectors. Turn the ignition switch ON. Read the COOLANT TEMP value. Standard: -40°C (-40°F) NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: REPAIR OR REPLACE HARNESS AND CONNECTOR

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 196

Scheme 196: CIRCUIT DESCRIPTION

HINT

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

REPLACE ECT SENSOR

HINT

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

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READ VALUE OF HAND-HELD TESTER (THROTTLE POS #1 AND THROTTLE POS #2) On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA / ALL / THROTTLE POS #1 and THROTTLE POS #2. Read the values. Result: B: Go to step 5 . A: Go to next step
CHECK WIRE HARNESS (TP SENSOR - ECM) Disconnect the T20 throttle actuator connector. Disconnect the E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT ECM (VC VOLTAGE) Turn the ignition switch ON. Measure the voltage of the ECM. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) NEXT
READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC. Start the engine and allow the engine to idle for 15 seconds or more. Read the DTC. Result: B: SYSTEM OK A: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

HINT

REPLACE THROTTLE BODY ASSY (See REPLACEMENT )

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 204

Scheme 204: CIRCUIT DESCRIPTION

HINT

If DTCs P0115, P0116, P0117, P0118 and P0125 are output simultaneously, ECT sensor circuit may be open or short. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.

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

Scheme 205

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0125) Result: HINT: If any other codes besides P0125 is output, perform the troubleshooting for those codes first. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
INSPECT THERMOSTAT (See «INSPECTION»(ref-209405-S39390751782005121000000) ) Check the valve opening temperature of the thermostat. OK: Valve opening temperature is 80 to 84°C (176 to 183°F) HINT: Also check that the valve is completely closed under opening temperature as above. NG: REPLACE THERMOSTAT (See «REPLACEMENT»(ref-209409-S33364848832005121000000) ) OK: Go to next step.
CHECK COOLING SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209405-S34157841912005121000000) ) Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or a modified cooling system. NG: REPAIR OR REPLACE COOLING SYSTEM OK: REPLACE ECT SENSOR

This DTC is output when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

Scheme 206

Scheme 206: CIRCUIT DESCRIPTION

Scheme 207

Scheme 207: MONITOR DESCRIPTION

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

Scheme 208

Scheme 208: MONITOR STRATEGY

Scheme 209

Scheme 209: TYPICAL ENABLING CONDITIONS

Scheme 210

Scheme 210: TYPICAL MALFUNCTION THRESHOLDS

Scheme 211

Scheme 211: MONITOR RESULT

Refer to CHECKING MONITOR STATUS for detailed information.

HINT

Scheme 212

Scheme 212: INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0128) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read the DTCs. Result: HINT: If any other codes besides P0128 are output, perform the troubleshooting for those DTCs first. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK COOLING SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209405-S34157841912005121000000) ) Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or a modified cooling system. Check the valve opening temperature of the thermostat. OK: Valve opening temperature is 80 to 84°C (176 to 183°F) HINT: Also check that the valve is completely closed under opening temperature as above. NG: REPAIR OR REPLACE COOLING SYSTEM OK: Go to next step.
INSPECT THERMOSTAT (See «INSPECTION»(ref-209405-S39390751782005121000000) ) NG: REPLACE THERMOSTAT OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

HINT

It is possible the malfunctioning area can be found using the active test "Control the injection volume A/F sensor" operation. The active test can determine if the HO2S or other potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5 % (decrease) or +25 % (increase) by the active test.

The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss.

Procedure

Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds.
Enter the following menus: Active Test/ Control the injection volume A/F sensor.
Perform the active test at the engine idling.

Standard

The HO2S reacts in accordance with increase and decrease of injection volume +25% --> Rich output: more than 0.55 V

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

Note. The HO2S (sensor 1) output has a few seconds of delay and the HO2S (sensor 2) output has a maximum of 20 seconds of delay. If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded.

Scheme 213

HINT

Scheme 214

Scheme 215

Scheme 216

Scheme 217

Scheme 218

Scheme 219

Scheme 220

Scheme 221

Scheme 222

Scheme 223

CHECK OTHER DTC OUTPUT Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DTC INFO/ CURRENT CODES. Read the CURRENT CODES. Result: B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (HO2S VOLTAGE) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ O2S B1S1 (or O2S B2S1). Allow the engine to run for 90 seconds by 2,500 RPM. Read the HO2S voltage at the engine idling. OK: The HO2S voltage alternates between below 0.4 V and more than 0.55 V (see the following figure). OK: Go to step 9 NG: Go to next step.
INSPECT HEATED OXYGEN SENSOR Disconnect the H9 or H10 HO2S connector. Measure the resistance of the HO2S. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance in the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (HO2S - ECM) Disconnect the H9 or H10 HO2S connector. Disconnect the E4 or E5 ECM connector. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OF REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK AIR INDUCTION SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209390-S37328991922005121000000) ) Check the air induction system for vacuum leaks. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
INSPECT FUEL INJECTOR ASSY (See «INSPECTION»(ref-209388-S07458260912005121000000) ) NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209388-S38831422642005121000000) ) OK: Go to next step. REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern. NEXT
READ OUTPUT DTC B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step. REPLACE HEATED OXYGEN SENSOR

HINT

It is possible the malfunctioning area can be found using the active test "Control the injection volume sensor" operation. The active test can determine if the HO2S or other potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5% (decrease) or +25% (increase) by the active test.

The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss.

Procedure

Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds.
Enter the following menus: Active Test/ Control the injection volume A/F sensor.
Perform the active test at the engine idling.

Standard

The HO2S reacts in accordance with increase and decrease of injection volume +25% - Rich output: more than 0.55 V

12.5% -> Lean output: Less than 0.4 V

Scheme 224

HINT

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

Scheme 225

Scheme 226

Scheme 227

Scheme 228

Scheme 229

Scheme 230

Scheme 231

Scheme 232

Scheme 233

Scheme 234

CHECK OTHER DTC OUTPUT B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (HO2S VOLTAGE) Connect the hand-held tester to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ O2S B1S1 (O2S B2S1). Allow the engine to run for 90 seconds by 2,500 RPM. Read the HO2S voltage with the engine idling. OK: The HO2S voltage alternates between less than 0.4 V and more than 0.55 V, and the period "t" must be less than 0.9 seconds (see the following figure). OK: Go to step 9 NG: Go to next step.
INSPECT HEATED OXYGEN SENSOR Disconnect the H9 or H10 HO2S connector. Measure the resistance between the terminals of HO2S. Standard: Reconnect the HO2S connector. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay. Measure the resistance in the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (HO2S - ECM) Disconnect the H9 or H10 HO2S connector. Disconnect the E4 or E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK AIR INDUCTION SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209390-S37328991922005121000000) ) Check the air induction system for vacuum leaks. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
INSPECT FUEL INJECTOR ASSY (See «INSPECTION»(ref-209388-S07458260912005121000000) ) NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209388-S38831422642005121000000) ) OK: Go to next step. REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern. NEXT
READ OUTPUT DTC (DTC P0133 OR P0153 IS OUTPUT AGAIN) B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step. REPLACE HEATED OXYGEN SENSOR

HINT

The injection volume can be switched to -12.5% (decrease) or +25% (increase) by the active test.

The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss.

Procedure

Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds.
Enter the following menus: Active Test/ Control the injection volume A/F sensor.
Perform the active test at the engine idling.

Standard

The HO2S reacts in accordance with increase and decrease of injection volume +25% --> Rich output: more than 0.55 V

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

Scheme 235

HINT

Scheme 236

Scheme 237

Scheme 238

Scheme 239

Scheme 240

Scheme 241

Scheme 242

Scheme 243

Scheme 244

CHECK OTHER DTC OUTPUT B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (FRONT HO2S VOLTAGE) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ O2S B1S1 (O2S B2S1). Allow the engine to idle until the ECT reaches 40°C (104°F). Quickly depress the accelerator pedal 3 times until the engine RPM reaches 4,000 RPM. Then, read the front HO2S voltage. Standard: The front HO2S voltage is 0.45 V or more at least once. OK: Go to step 11 . NG: Go to next step.
CHECK CONNECTION OF PCV HOSE OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
INSPECT HEATED OXYGEN SENSOR Disconnect the H9 or H10 HO2S connector. Measure the resistance of the HO2S. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance in the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (HO2S - ECM) Disconnect the H9 or H10 HO2S connector. Disconnect the E4 or E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK AIR INDUCTION SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209390-S37328991922005121000000) ) Check the air induction system for vacuum leaks. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
INSPECT FUEL INJECTOR ASSY (See «INSPECTION»(ref-209388-S07458260912005121000000) ) NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209388-S38831422642005121000000) ) OK: Go to next step.
CHECK FOR EXHAUST GAS LEAKAGE NG: REPAIR OR REPLACE EXHAUST SYSTEM OK: Go to next step. REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern. NEXT
READ OUTPUT DTC B: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) A: Go to next step.
CONFIRM IF VEHICLE HAS RUN OUT OF FUEL If the vehicle has run out of fuel, proceed to A. If the vehicle has not run out of fuel, proceed to B. B: CHECK FOR INTERMITTENT PROBLEMS (see «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step. DTC IS CAUSED BY RUNNING OUT OF FUEL

HINT

The injection volume can be switched to -12.5 % (decrease) or +25 % (increase) by the active test.

The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss.

Procedure

Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds.
Enter the following menus: Active Test/ Control the injection volume A/F sensor.
Perform the active test at the engine idling.

Standard

The HO2S reacts in accordance with increase and decrease of injection volume +25 % --> Rich output: more than 0.55 V

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

Scheme 245

HINT

Scheme 246

Scheme 247

Scheme 248

Scheme 249

Scheme 250

Scheme 251

Scheme 252

Scheme 253

Scheme 254

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0136 OR P0156) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES. Read the DTCs. Result: HINT: If any other codes besides P0136 or P0156 are output, perform the troubleshooting for those DTCs first. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
READ VALUE OF HAND-HELD TESTER (HO2S VOLTAGE) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ O2S B1S2 (O2S B2S2). Allow the engine to run at 2,500 RPM for 3 minutes. Depress the accelerator pedal quickly to open until the engine RPM reaches 4,000 RPM 3 times. OK: The HO2S voltage alternates from below 0.4 V to 0.5 V or more. OK: Go to step 6 NG: Go to next step.
INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H19 or H20 HO2S (sensor 2) connector. Measure the resistance the HO2S. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance in the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (ECM - HO2S) Disconnect the H19 and H20 HO2S connectors. Disconnect the E2 ECM connector. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE HEATED OXYGEN SENSOR
PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern. NEXT
READ OUTPUT DTC B: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: REPLACE HEATED OXYGEN SENSOR

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

The short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at stoichiometric air-fuel ratio. The signal from the Heated Oxygen Sensor (HO2S) indicates whether the air-fuel ratio is RICH or LEAN compared to the stoichiometric air-fuel ratio. This variance triggers a reduction in the fuel volume if the air-fuel ratio is RICH, and an increase in the fuel volume if it is LEAN.

The short-term fuel trim varies from the central value due to individual engine differences, wear over time and changes in the operating environment. The long-term fuel trim, which controls overall fuel compensation, steadies long-term deviations of the short-term fuel trim from the central value.

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

Scheme 255

Scheme 255: CIRCUIT DESCRIPTION

HINT

When DTC P0171 or P0174 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 or P0175 is recorded, the actual air-fuel ratio is on the RICH side.
If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 or P0174 may be recorded. The MIL then turns on.
If the total of the short-term fuel trim value and long-term fuel trim value is within the malfunction threshold (and ECT is more than 75°C (167°F)), the system is functioning normally.

HINT

It is possible the malfunctioning area can be found using the active test "Control the injection volume A/F sensor" operation. The active test can determine if the HO2S or the potential trouble areas are malfunctioning or not.

The injection volume can be switched to -12.5 % (decrease) or +25 % (increase) by the active test.

The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss.

Procedure

Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3.
Turn the ignition switch ON.
Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds.
Enter the following menus: Active Test/ Control the injection volume A/F sensor.
Perform the active test at the engine idling.

Standard

The HO2S reacts in accordance with increase and decrease of injection volume +25 % --> Rich output: more than 0.55 V

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

Scheme 256

HINT

A high HO2S (sensor 1) voltage (0.55 V or more) indicates a RICH air fuel ratio.

A low HO2S (sensor 1) voltage (0.4 V or less) indicates a LEAN air fuel ratio.

Scheme 257

Scheme 258

Scheme 259

Scheme 260

Scheme 261

Scheme 262

Scheme 263

Scheme 264

Scheme 265

Scheme 266

CHECK OTHER DTC OUTPUT B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK CONNECTION OF PCV HOSE OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
CHECK AIR INDUCTION SYSTEM (See «ON-VEHICLE INSPECTION»(ref-209390-S37328991922005121000000) ) Check the air induction system for vacuum leaks. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
PERFORM ACTIVE TEST (A/F CONTROL) Perform the ACTIVE TEST A/F CONTROL with the hand-held tester and check the HO2S status. Standard: HO2S reacts in accordance with increase and decrease of injection volume +25 % --> Rich output: More than 0.55 V -12.5 % --> Lean output: Less than 0.4 V
READ VALUE OF HAND HELD TESTER (COOLANT TEMP) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: ENHANCED OBD II/ DATA LIST/ ALL/ COOLANT TEMP. Read the COOLANT TEMP value when the engine is cold and warm-up. Standard: ECT when the engine is cold: same as ambient temperature. ECT when the engine is warm-up: 75 to 95°C (167 to 203°F) NG: REPLACE ECT SENSOR OK: Go to next step.
READ VALUE OF HAND-HELD TESTER (MAF) Enter the following menus: DATA LIST/ ALL / MAF. Allow the engine to idle until the ECT reaches 75°C (167°F). Read the MAF value at idle RPM and 3,000 RPM. Standard: MAF at idle RPM: 3 to 6 g/s (shift position: N and A/C: OFF) MAF at 3,000 RPM: 11 to 23 g/s (shift position: N and A/C: OFF) NG: REPLACE MAF METER OK: Go to next step.
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: REPAIR OR REPLACE FUEL SYSTEM OK: Go to next step.
CHECK FOR EXHAUST GAS LEAKAGE NG: REPAIR OR REPLACE EXHAUST SYSTEM OK: Go to next step.
CHECK FOR SPARK AND IGNITION (See «ON-VEHICLE INSPECTION»(ref-209414-S21476511922005121000000) ) HINT: If the spark plugs or ignition system malfunction, engine misfire may occur. The misfire counter can be read with the hand-held tester. Enter the following menus: ENHANCED OBD II/ DATA LIST/ ALL/ CYL#1 (to CYL#8). NG: REPAIR OR REPLACE IGNITION SYSTEM OK: Go to next step.
INSPECT FUEL INJECTOR ASSY (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) HINT: If the injectors malfunction, engine misfire may occur. The misfire counter can be red with the hand-held tester. Enter the following menus: ENHANCED OBD II/ DATA LIST/ ALL/ CYL#1 (to CYL#8). NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209388-S38831422642005121000000) ) OK: Go to next step.
INSPECT HEATED OXYGEN SENSOR Disconnect the H9 or H10 HO2S connector. Measure the resistance of the HO2S. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay from the engine room Relay block (R/B). Measure the resistance of the EFI MAIN relay. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (HO2S - ECM) Disconnect the H9 or H10 HO2S connector. Disconnect the E4 or E5 ECM connectors. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
REPLACE HEATED OXYGEN SENSOR NEXT
PERFORM CONFIRMATION DRIVING PATTERN Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Switch from normal mode to check mode. Warm up the engine until the Engine Coolant Temperature (ECT) reaches to 75°C (167°F). Drive the vehicle at 50 km/h (31 mph) or more for 3 to 5 minutes. Allow the engine to idle for 2 minutes. Perform procedure (d) and (e) at least 3 times. Confirm that no DTC occurs. NEXT END

When the engine is cranked, current flows from terminal ST of the ignition switch to the starter relay coil and also current flows to terminal STA of the ECM (STA signal). When the STA signal and NE signal are input to the ECM, Transistor 1 (Tr1) of the ECM is turned ON, current flows to the coil of the circuit opening relay (Marking C/OPN), the relay switches on, power is supplied to the fuel pump, and the fuel pump operates. While the NE signal is generated (engine running), the ECM keeps Tr1 ON (circuit opening relay ON) and the fuel pump also keeps operating. The fuel pump speed is controlled at two levels (high speed or low speed) by the condition of the engine (starting, light load, heavy load).

The fuel pump operates at high speed when: 1) the engine starts and the STA signal is ON; and 2) Transistor 2 (Tr2) of the ECM is OFF, causing the fuel pump relay (Marking: F/PMP) to close and battery positive voltage to be applied directly to the fuel pump.

The fuel pump operates at low speed when: 1)after the engine starts, the engine is idling or has a light load; and 2) since the ECM's Tr2 is ON, battery positive voltage is applied to the fuel pump via the fuel pump resistor.

Scheme 267

Scheme 267: CIRCUIT DESCRIPTION

Scheme 268

Scheme 269

Scheme 269: WIRING DIAGRAM

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

Scheme 270

Scheme 270: INSPECTION PROCEDURE

Scheme 271

Scheme 272

Scheme 273

Scheme 274

Scheme 275

INSPECT ECM (FPR VOLTAGE) Measure the voltage of the ECM connectors. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
INSPECT RELAY (F/PMP) Remove the F/PMP relay from the engine room Relay Block (R/B). Measure the resistance. Standard: NG: REPLACE RELAY (F/PMP) OK: Go to next step.
CHECK WIRE HARNESS (F/PMP RELAY - ECM) Remove the F/PMP relay from the engine room R/B. Disconnect the E3 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

Scheme 276

Scheme 276: CIRCUIT DESCRIPTION

When a misfire occurs in the engine, hydrocarbons (HC) enter the exhaust in high concentrations. If the HC concentration is too high, exhaust emissions levels may increase. High concentrations of HC can also cause the temperature of the catalyst to increase, possibly damaging the catalyst. To prevent this increase in emissions and limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the catalyst reaches a point of thermal degradation, the ECM will continuously flash the MIL. For monitoring misfire, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. The misfire counter records how many times the crankshaft rotation speed variations exceed threshold values.

If the misfiring rate exceeds the threshold value and could cause emissions deterioration, the ECM illuminates the MIL and set a DTC.

Scheme 277

HINT

When several codes for misfired cylinders are recorded repeatedly but no random misfire codes are recorded, this indicates that the misfires were detected and recorded at different times. Random misfire codes are recorded only when several misfires occur at the same time.

Reference: Inspection using an oscilloscope.

With the engine idling, check the waveform between terminals #10 to #80 and E1 of the ECM connector The correct waveform is as shown.

Scheme 278

HINT

If DTCs besides misfire DTCs are memorized simultaneously, troubleshoot the non-misfire DTCs first.

Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
If the misfire does not occur when the vehicle is brought to the workshop, the misfire can be confirmed by reproducing the condition of the freeze frame data. Also, after finishing the repair, confirm that there is no misfire (see «CONFIRMATION DRIVING PATTERN»(ref-209347-S28638052682005120900000) ).
On 6 and 8 cylinder engines, cylinder specific misfire fault codes are disabled at high engine speeds. If the misfire starts in a high engine speed area or the misfire occurs only in a high engine speed area, only the general fault code P0300 will be stored. When only a general misfire fault code like P0300 is stored: Erase the general misfire fault code from the scan tool. Start the engine and drive the confirmation pattern (see «CONFIRMATION DRIVING PATTERN»(ref-209347-S28638052682005120900000) ). Read the value of the misfire ratio for each cylinder. Or, read the DTC. Perform repairs on the cylinder that has a high misfire ratio. Or repair the cylinder indicated by the DTC. After finishing repairs, drive the confirmation pattern again and confirm that no misfire occurs.
When either of SHORT FT #1, LONG FT #1, SHORT FT #2 or LONG FT #2 in the freeze frame data is over the range of +/-20 %, there is a possibility that the air-fuel ratio is becoming RICH (-20 % or less) or LEAN (+20 % or more). When COOLANT TEMP in the freeze frame data is less than 75°C (167°F), there is a possibility of misfire only during engine warm-up.
If the misfire cannot be reproduced, the following reasons may apply: 1) the vehicle has low fuel, 2) improper fuel is being used, 3) the ignition plug is contaminated, or 4) another problem.
Be sure to check the value on the misfire counter after the repair.

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CHECK DTC Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Read and note DTCs and the freeze frame data. Result: B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK MISFIRE RPM AND MISFIRE LOAD Read and note the MISFIRE RPM and the MISFIRE LOAD (engine load) with the DATA LIST. HINT: The MISFIRE RPM and MISFIRE LOAD indicate the vehicle conditions in which misfire occurs. NEXT
CHECK CONNECTION OF PCV HOSE OK: PCV hose is connected correctly and is not damaged. NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
CHECK MISFIRE COUNT (CYL#1, #2, #3, #4, #5, #6, #7 or #8) Clear the DTCs. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST. Select the engine RPM, calculated load, CYL#1, #2, #3, #4, #5, #6, #7 and #8 of the DATA LIST. Allow the engine to idle. Read the misfire count of the cylinders #1 to #8. If no misfire counts in all the cylinders, move the shift lever into the D position and repeat steps (b) to (e). If misfire counts still do not occur, perform steps (f) and (g). Drive the vehicle with the MISFIRE RPM and the MISFIRE LOAD. Read the misfire count of the cylinders #1 to #8, or DTCs. Result: HINT: If it is difficult to reproduce misfires for each cylinder, check the DATA LIST item called MISFIRE MAR GIN. Try to find vehicle driving conditions that lower the MISFIRE MARGIN value. Values above 3 are considered normal. If the freeze frame data's record of the ECT is below 75°C (167°F), the misfire may be detected only when the engine is cold. If the freeze frame data's record of the ENGINE RUN TIME is below 120 seconds, the misfire may be detected right after the engine is started. *Misfire margin indicates possibility that misfires do not occur. The misfires are counted when the misfire margin is 0 % or less. There is little possibility of misfires if the misfire margin is less than 30 %. Misfire margin is calculated with the following arithmetic expression. B: Go to step 14 . A: Go to next step.
PERFORM ACTIVE TEST (FUEL CUT#1 - #8) Allow the engine to idle. Enter the following menus: DIAGNOSIS/ENHANCED OBDII / ACTIVE TEST/ FUEL CUT#1 (to #8). If a cylinder has a high misfire count, cut fuel to the cylinder. Compare the misfire count of the cylinder before fuel cut and after fuel cut. Result: HINT: "The misfire count of the cylinder before fuel cut and after fuel cut are roughly the same" means the cylinder is misfiring. "The misfire count of the cylinder before fuel cut is lower than after fuel cut" means the cylinder misfires sometimes. NOTE: This ACTIVE TEST cannot be performed while the vehicle is being driven. B: Go to step 12 A: Go to next step.
CHECK SPARK PLUG Remove the engine cover. Remove the ignition coil and the spark plug of misfire cylinder). Measure the spark plug electrode gap. Standard: The electrode gap is 1.0 to 1.3 mm (0.039 to 0.051 in.) Check the electrode for carbon deposits. Recommended spark plug: NOTE: If the electrode gap is larger than the standard, replace the spark plug. Do not adjust the electrode gap. NG: REPLACE SPARK PLUG OK: Go to next step.
CHECK SPARK 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 occurs Reconnect the injector connectors NG: Go to step 9 OK: Go to next step.
CHECK CYLINDER COMPRESSION PRESSURE ON MISFIRING CYLINDER (See «INSPECTION»(ref-209391-S24650181782005121000000) ) Measure the cylinder compression pressure of the misfiring cylinder. NG: REPAIR OR REPLACE OK: Go to step 10
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 a spark occurs while the engine is being cranked. OK: Spark jumps across electrode gap. OK: REPLACE SPARK PLUG NG: Go to next step. REPLACE IGNITION COIL ASSY (See «REPLACEMENT»(ref-209414-S06627920402005121000000) ) (THEN CONFIRM THAT THERE IS NO MISFIRE)
INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70 OR #80 VOLTAGE) Turn the ignition switch ON. Measure the voltage the ECM connectors. Standard: OK: Go to step 12 NG: Go to next step.
CHECK WIRE HARNESS (INJECTOR - ECM) Disconnect the injector connector (of the misfire cylinder and the E4 and E5 ECM connectors. Turn the ignition switch ON. Measure the resistance and voltage between the injector and the ECM connector terminals. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK FUEL INJECTOR OF MISFIRING CYLINDER (See «INSPECTION»(ref-209388-S07458260912005121000000) ) NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209388-S38831422642005121000000) ) OK: Go to next step.
CHECK VALVE CLEARANCE OF MISFIRING CYLINDER (See «INSPECTION»(ref-209391-S24650181782005121000000) ) NG: ADJUST VALVE CLEARANCE (See «ADJUSTMENT»(ref-209391-S02884753962005121000000) ) OK: Go to next step.
CHECK AIR INDUCTION SYSTEM NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
CHECK VALVE TIMING Remove the engine cover. Remove the drive belt. Remove the timing belt cover LH and RH. Turn the crankshaft to align the matchmarks of the crankshaft. Align the notch of the crankshaft pulley to the "0" position. Confirm whether the camshaft pulley's matchmark and the matchmark of the cylinder head cover face each other. Turn the crankshaft clockwise by 360° if these do not face each other. Confirm whether or not these face each other once again. OK: The matchmarks of the camshaft pulley and the cylinder head cover face each other when the notch of the crankshaft pulley is in the "0" position. NG: ADJUST VALVE TIMING (See «TIMING BELT»(ref-209391-S10462282172005121000000) ) OK: Go to next step.
CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) ) NG: CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND FILTER OK: Go to next step.
READ VALUE OF HAND HELD TESTER (COOLANT TEMP) Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Enter the following menus: ENHANCED OBD II/ DATA LIST/ ALL/ COOLANT TEMP. Read the COOLANT TEMP value when the engine is cold and warm-up. Standard: ECT when the engine is cold: same as ambient temperature. ECT when the engine is warm-up: 75 to 95°C (167 to 203°F) NG: REPLACE ECT SENSOR OK: Go to next step.
READ VALUE OF HAND-HELD TESTER (MAF) Enter the following menus: DATA LIST/ ALL / MAF. Allow the engine to idle until the ECT reaches 75°C (167°F). Read the MAF value at idle RPM and 3,000 RPM. Standard: MAF at idle RPM: 3 to 6 g/s (shift position: N and A/C: OFF) MAF at 3,000 RPM: 11 to 23 g/s (shift position: N and A/C: OFF) NG: REPLACE MAF METER OK: Go to next step. CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) )

***at type knock sensor (non-resonant type) can detect vibration in a wide band of frequency (6 kHz to 15 kHz).

The sensor, located on the cylinder block, detects spark knock. When a spark knock occurs, the knock sensor picks up vibrations in a specific frequency range. When the ECM detects signal voltage in this frequency range, it retards the ignition timing to suppress the knocking. The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults in the sensor.

Scheme 292

Scheme 292: CIRCUIT DESCRIPTION

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 293

Scheme 294

HINT

DTC P0325, P0327 and P0328 are for the bank 1 knock sensor circuit.

DTC P0330, P0332 and P0333 are for the bank 2 knock sensor circuit.

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

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READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT) Disconnect the EC2 connector. Using lead wires, connect the EC2 terminals as follow Warm up the engine. Run the engine at 3,000 RPM for 10 seconds or more. Check the DTC. Result: B: Go to step 4 C: Go to step 5 A: Go to next step.
CHECK WIRE HARNESS (EC2 CONNECTOR - ECM) Disconnect the EC2 connector. Disconnect the E6 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT ECM Reconnect the E7 ECM connector. Turn the ignition switch ON. Measure the voltage of the ECM. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step. CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NOTE: Fault may be intermittent. Check harness and connectors carefully and retest.
INSPECT KNOCK SENSOR Check the knock sensor installation. Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) NG: TIGHTEN SENSOR OK: Go to next step. REPLACE KNOCK SENSOR (See «REPLACEMENT»(ref-209387-S23722362592005121000000) )
INSPECT KNOCK SENSOR Disconnect the EC2 connector. Measure the resistance of the EA1 male connector. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NG: Go to next step.
CHECK WIRE HARNESS HINT: If DTC P0327 or P0328 has changed to P0332 or P0333, check the knock sensor circuit on the bank 1 side. If DTC P0332 or P0333 has changed to P0327 or P0328, check the knock sensor circuit on the bank 2 side. Disconnect the EC2 connector. Disconnect the K2 or K3 knock sensor connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE KNOCK SENSOR (See «REPLACEMENT»(ref-209387-S23722362592005121000000) )

The Crankshaft Position (CKP) sensor system consists of a CKP sensor plate and a magnetic coil.

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

Scheme 309

Scheme 309: CIRCUIT DESCRIPTION

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

Scheme 310

Scheme 311

HINT

Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
The engine speed can be confirmed in DATA LIST using the hand-held tester. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ ENGINE SPD. If no NE signals are sent from the CKP sensor even though the engine is revolving, the engine speed will be indicated as zero. If the voltage output of the CKP sensor is insufficient, the engine speed will be indicated as lower than actual RPM.

Scheme 312

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INSPECT CRANKSHAFT POSITION SENSOR Disconnect the C4 CKP sensor connector. Measure the resistance of the sensor. Standard: NOTE: In the above section, the 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). NG: REPLACE CRANKSHAFT POSITION SENSOR (See «REPLACEMENT»(ref-209414-S19314207992005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (CKP SENSOR - ECM) Disconnect the C6 CKP sensor connector. Disconnect the E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK SENSOR INSTALLATION (CKP SENSOR) OK: The CKP sensor is installed properly. NG: TIGHTEN SENSOR OK: Go to next step.
CHECK CRANKSHAFT TIMING PULLEY (TEETH OF PLATE) OK: Timing pulley's teeth have no deformation or cracks. NG: REPLACE CRANKSHAFT TIMING PULLEY OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The Variable Valve Timing (VVT) sensor consists of a magnet, iron core and pickup coil. The VVT signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotates, changes occur on the camshaft protrusions and the pickup coil air gaps. These changes cause fluctuations in the magnetic field and generate voltage in the pickup coil.

Each sensor monitors its timing rotor, which is located on the camshaft. The ECM uses the sensor to detect the camshaft angle. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates the rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, ECM controls camshaft position.

Scheme 318

Scheme 318: CIRCUIT DESCRIPTION

HINT

DTC P0340 and P0345 indicate a malfunction related to the VVT sensor (+) circuit (wire harness (from ECM to VVT sensor) and VVT sensor).
DTC P0341 and P0346 indicate a malfunction related to the VVT sensor (-) circuit (wire harness (from ECM to VVT sensor) and VVT sensor).

Reference: Inspection using an oscilloscope.

During cranking or idling, check the waveform of the ECM connector.

Scheme 319

Scheme 320

HINT

If DTC P0340 and P0341 are displayed, check the left bank VVT sensor.
If DTC P0345 and P0346 are displayed, check the right bank VVT sensor.
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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INSPECT VVT SENSOR Disconnect the V5 or V6 VVT sensor connector. Measure the resistance between the terminals of the VVT sensor. Standard: NOTE: In the above chart, the 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 VVT sensor connector. NG: REPLACE VVT SENSOR (See «OVERHAUL»(ref-209391-S25987520032005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (VVT SENSOR - ECM) Disconnect the V5 or V6 VVT sensor connector. Disconnect the E5 or E4 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
CHECK SENSOR INSTALLATION (VVT SENSOR) OK: The VVT sensor is installed properly. NG: TIGHTEN SENSOR OK: Go to next step.
CHECK CRANKSHAFT TIMING PULLEY Check the teeth of the camshaft timing pulley. NG: REPLACE CRANKSHAFT TIMING PULLEY OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

HINT

Scheme 327

Scheme 327: INSPECTION PROCEDURE

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CHECK SPARK PLUG Remove the engine cover. Remove the ignition coil and the spark plug of the misfire cylinder. Measure the spark plug's electrode gap. Standard: Electrode gap: 1.0 to 1.3 mm (0.039 to 0.051 in.) Check the electrode for carbon deposits. Recommended spark plug: NOTE: If the electrode gap is larger than the standard, replace the spark plug. Do not adjust the electrode gap. NG: REPLACE SPARK PLUG OK: Go to next step.
CHECK SPARK 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 occurs NG: Go to step 5 OK: Go to next step.
CHECK WIRE HARNESS (IGNITION COIL - ECM) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector. Disconnect the E4 ECM connector. Measure the resistance of the wire harness side connectors. Standard: Reconnect the ECM connector. Reconnect the ignition coil connector. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT ECM (IGF1 AND IGF2 VOLTAGE) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector. Turn the ignition switch ON. Measure the voltage of the ECM. Standard: Reconnect the ignition coil connector. NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step. REPLACE IGNITION COIL ASSY (See «REPLACEMENT»(ref-209414-S06627920402005121000000) )
CHECK WIRE HARNESS (IGNITION COIL - ECM) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector. Disconnect the E4 or E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5, IGT6, IGT7 AND IGT8 VOLTAGE) Measure the voltage of the ECM when the engine is cranked. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
INSPECT IGNITION COIL ASSY (POWER SOURCE) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil connector. Turn the ignition switch ON and START position. Measure the voltage of the wire harness side connector. Standard: Reconnect the ignition coil connector. OK: REPLACE IGNITION COIL ASSY (See «REPLACEMENT»(ref-209414-S06627920402005121000000) ) NG: Go to next step.
CHECK WIRE HARNESS (IGNITION COIL - IGNITION SWITCH) Inspect the IGN fuse. Remove the IGN fuse from the engine room Relay Block (R/B). Measure the resistance of the IGN fuse. Standard: Below 1 ohm Reinstall the IGN fuse. Disconnect ignition coil connectors I1, I2, I3, I4, I5 or I6. Disconnect the I15 ignition switch connector. Measure the resistance of the wire harness side connectors. Standard: Reconnect the ignition switch connector. Reconnect the ignition coil connector. Reinstall the IGN fuse. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE IGNITION COIL ASSY (See «REPLACEMENT»(ref-209414-S06627920402005121000000) )

HINT

Scheme 346

Scheme 346: INSPECTION PROCEDURE

Scheme 347

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CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0420, P0430) B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK FOR EXHAUST GAS LEAKAGE NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT OK: Go to next step.
INSPECT HEATED OXYGEN SENSOR (RESISTANCE) Disconnect the H9, H10, H19 and H20 HO2S connectors. Measure the resistance of the sensor. Standard: NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step.
PERFORM ACTIVE TEST (A/F CONTROL) It is possible the malfunctioning area can be found using the active test "Control the injection volume sensor" operation. The active test can determine if the HO2S or other potential trouble areas are malfuncting or not. The injection volume can be switched to - 12.5 % (decrease) or +25 % (increase) by the active test. The active test procedure enables a technician to check and graph the voltage outputs of the HO2Ss. Procedure: Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Turn the ignition switch ON. Warm up the engine by running the engine at 2,500 RPM for approximately 90 seconds. Enter the following menus: Active Test/ Control the injection volume A/F sensor. Perform the active test at the engine idling. Standard: The HO2S reacts in accordance with increase and decrease of injection volume +25% --> Rich output: more than 0.55 V -12.5% --> Lean output: Less than 0.4 V NOTE: The HO2S (sensor 1) output has a few seconds of delay and the HO2S (sensor 2) output has a maximum of 20 seconds of delay. If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and the DTCs will be recorded. NG: REPLACE HEATED OXYGEN SENSOR OK: Go to next step. REPLACE CATALYST CONVERTER (BANK 1 OR BANK 2) AND FRONT EXHAUST PIPE NOTE: Replace both the front catalyst and rear catalyst (front exhaust pipe) of the damaged bank.

Scheme 350

Scheme 350: CIRCUIT DESCRIPTION

The Evaporative emissions (EVAP) system is equipped to reduce EVAP in the fuel tank.

The EVAP system contains the following

Scheme 351

Canister: Stores EVAP that is created in the fuel tank.
Fuel Tank Pressure (FTP) sensor: Measures the FTP.
EVAP VSV: Opens and purges EVAP in the EVAP canister into the intake manifold. ON: open OFF: closed
Canister Closed Valve (CCV): Introduces atmosphere to the EVAP canister when it opens. The CCV opens under the normal condition. ON: closed OFF: open
Bypass VSV: Connects the fuel tank and EVAP canister.

Scheme 352

Scheme 352: MONITOR DESCRIPTION

The ECM monitors EVAP leak and the components on the EVAP system using a continuous test called the EVAP System Test. The EVAP System Test is done according to the following procedures

The ECM starts the EVAP System Test when the following conditions are met. The Engine Coolant Temperature (ECT) and the Intake Air Temperature (IAT) are 10 to 35°C (50 95°F) when the engine is started (P0455, P0456). The ECT and IAT is 10 to 32°C (50 to 90°F) when the engine was started (P0442). The difference of the ECT and IAT is -7 to 11°C (-12.6 to 20°F) when the engine was started. FTP is stabilized.
The ECM measures the increase in EVAP (increase in FTP).
The ECM closes the CCV to shut out the atmosphere and opens the bypass VSV to connect the EVAP canister and the fuel tank. Then the ECM opens the EVAP VSV to use the intake manifold's pressure to create a vacuum (negative pressure) in the EVAP canister and fuel tank.
If the FTP does not decrease while a vacuum was being introduced (step (C)), the ECM determines that the EVAP VSV is stuck closed. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P0441.
The ECM closes the EVAP VSV to seal the EVAP system. The ECM then performs an EVAP leak check by monitoring FTP increase for 5 seconds. If the FTP increase is larger than the specified value, the ECM interprets this as an EVAP 0.02 inch leak. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P0456. If the FTP increase is larger than an EVAP 0.02 inch leak, the ECM interprets this as an EVAP 0.04 inch leak. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P0442. If the FTP does not drop to -18 mmHg-g (-2.4 kPa) when creation of vacuum (negative pressure) is finished, the ECM interprets this as an EVAP gross leak. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P0455.
The ECM opens the CCV to check CCV operation. If the FTP increase is smaller than the specified value, the ECM determines that the CCV is stuck closed. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P0446.
The ECM closes the bypass VSV to check bypass VSV operation.

If the FTP increase is larger than the specified value, the ECM interprets this as a bypass VSV malfunction. The ECM illuminates the MIL (2 trip detection logic) and sets DTC P2418.

If the FTP is less than the specified value, the ECM determines that the EVAP VSV is stuck open or the CCV to check closed. The ECM illuminates the MIL (2 trip detection logic) and sets DTCs P0441 and P0446.

Scheme 353

Scheme 353: MONITOR STRATEGY

Scheme 354

Scheme 354: TYPICAL ENABLING CONDITIONS

HINT

If DTC P0441 (purge flow), P0446, P2418 (CCV or bypass VSV), P0451, P0452 or P0453 (evaporate pressure sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446, P2418, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
Ask the customer if, after the MIL came on, the customer found the fuel tank cap was loose and tightened it. Also ask the customer if 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 that was loose, troubleshoot according to the following procedure.
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the FTP sensor.

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CHECK FUEL TANK CAP ASSY OK: The fuel cap meets OEM specifications. NG: REPLACE WITH A CAP THAT MEETS OEM SPECIFICATIONS OK: Go to next step.
CHECK THAT FUEL TANK CAP IS CORRECTLY INSTALLED OK: The fuel cap is tightened securely. NG: CORRECTLY INSTALL FUEL TANK CAP OK: Go to next step.
INSPECT FUEL TANK CAP ASSY (See «ON-VEHICLE INSPECTION»(ref-209389-S22844090202005121000000) ) NG: REPLACE FUEL TANK CAP ASSY OK: Go to next step.
CHECK FILLER NECK FOR DAMAGE Remove the fuel tank cap. Visually inspect the filler neck for damage. Reinstall the fuel tank cap. NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY OK: Go to next step.
PERFORM ACTIVE TEST (EVAP VSV) Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ACTIVE TEST. Disconnect the vacuum hose of the EVAP VSV from the EVAP canister. Start the engine. Select the item EVAP VSV (ALON)/ ALL in the ACTIVE TEST and operate the EVAP VSV (press the right or left button). When the EVAP VSV is operated by the hand-held tester, check whether the disconnected hose applies suction to your finger. OK: OK: Go to step 9 NG: Go to next step.
CHECK VACUUM HOSES (INTAKE MANIFOLD - EVAP VSV - CANISTER) Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, holes, damage and blockage. NG: REPAIR OR REPLACE VACUUM HOSES OK: Go to next step.
INSPECT EVAP VSV (OPERATION) (See «ON-VEHICLE INSPECTION»(ref-209389-S22844090202005121000000) ) Check that air flows with difficulty from ports F to E. Apply battery positive voltage across the terminals. Check that air flows without resistance from ports F to E. NG: REPLACE EVAP VSV OK: Go to next step.
CHECK WIRE HARNESS (EVAP VSV - ECM - EFI MAIN RELAY) Disconnect the V4 EVAP VSV connector. Disconnect the E5 ECM connector. Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )
PERFORM ACTIVE TEST (CCV) Disconnect the vacuum hose of the CCV from the charcoal canister. Start the engine. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST/ CAN CTRL VSV. Operate the CCV with the hand-held tester and check air flow of the CCV. Standard: OK: Go to step 13 NG: Go to next step.
CHECK VACUUM HOSES (CCV - CANISTER) Check that the vacuum hose is connected correctly. Check the vacuum hose for looseness and disconnection. Check the vacuum hose for cracks, hole damage and blockage. NG: REPAIR OR REPLACE VACUUM HOSES OK: Go to next step.
INSPECT CCV (OPERATION) (See «INSPECTION»(ref-209389-S37094468482005121000000) ) Check that the air flows from ports A to B. Apply battery positive voltage across the terminals. Check that the air does not flow from ports A to B. NG: REPLACE CCV OK: Go to next step.
CHECK WIRE HARNESS (ECM - CCV - EFI MAIN RELAY) Disconnect the V3 CCV connector. Disconnect the E2 ECM connector. Remove the EFI MAIN relay from the engine room R/B. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )
PERFORM ACTIVE TEST (BYPASS VSV) Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ ACTIVE TEST / TANK BYPASS VSV. Press the right or left button, operate the bypass VSV. Check air flow when operating the bypass VSV. Standard: OK: Go to step 16 NG: Go to next step.
INSPECT BYPASS VSV (OPERATION) (See «INSPECTION»(ref-209389-S37094468482005121000000) ) Check that the air flows with difficulty from ports E to F. Apply battery positive voltage across the terminals. Check that the air flows from ports E to F. NG: REPLACE BYPASS VSV OK: Go to next step.
CHECK WIRE HARNESS (EFI MAIN RELAY - BYPASS VSV - ECM) Disconnect the V11 bypass VSV connector. Disconnect the E3 ECM connector. Remove the EFI MAIN relay from the engine room R/B. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )
CHECK FOR EVAP LEAK (NEAR FUEL TANK) Check whether hoses close to the fuel tank have been modified, and check whether there are signs of any damage near the fuel tank or the charcoal canister. Check for cracks, deformation or loose connection of the following parts: Fuel tank EVAP canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister NG: REPAIR OR REPLACE EVAP LEAK PART OK: Go to next step.
CHECK HOSE AND TUBE Check the connection between the fuel tank and fuel EVAP pipe, the fuel EVAP pipe and under-floor fuel tube, and the under-floor fuel tube and EVAP canister. Check the hose and the tube for cracks, holes and damage. NG: REPLACE HOSE AND TUBE OK: Go to next step.
CHECK EVAP CANISTER (FOR CRACKS, HOLE AND DAMAGE) NG: REPLACE EVAP CANISTER OK: Go to next step.
INSPECT FUEL TANK NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step. REPLACE FUEL TANK ASSY (See «REPLACEMENT»(ref-209388-S30688375432005121000000) )

The Fuel Tank Pressure (FTP) sensor, the Evaporative Emissions (EVAP) Vacuum Switching Valve (VSV), Canister Closed Valve (CCV) and bypass VSV are used to detect abnormalities in the EVAP control system. The ECM decides whether or not there is an abnormality in the EVAP system based on the FTP sensor signals.

Scheme 380

Scheme 380: CIRCUIT DESCRIPTION

Scheme 381

HINT

If DTC P0441 (purge flow), P0446, P2418 (CCV or bypass VSV), P0451, P0452 or P0453 (FTP sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446, P2418, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the FTP sensor.

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INSPECT ECM (VCP2 VOLTAGE) Turn the ignition switch ON. Measure the voltage between the terminals of the E2 ECM connector. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch ON. Disconnect the hose from the FTP sensor. Measure the voltage between the terminal E2-25 (PTNK) and the terminal E2-26 (EPA2) of the ECM connector. Standard: 2.9 to 3.7 V Then, check the voltage fluctuation. Standard: The voltage fluctuates within 0.3 V for 10 seconds. (No noise is found on the FTP sensor outputs.) Apply a vacuum of 4 kPa (30 mmHg, 1.18 in.Hg) to the FTP sensor using a vacuum pump. Standard: Below 0.5 V NOTE: The vacuum applied to the FTP sensor must be less than 66.7 kPA (500 mmHg, 19.7 in.Hg). OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NG: Go to next step.
CHECK WIRE HARNESS (FTP SENSOR - ECM) Disconnect the V10 FTP sensor connector. Disconnect the E2 ECM connector. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The Vehicle Speed Sensor (VSS) outputs a 4-pulse signal for every revolution of the rotor shaft, which is rotated by the transmission output shaft via the driven gear. The ECM determines the vehicle speed based on this signal.

Scheme 388

Scheme 388: CIRCUIT DESCRIPTION

Scheme 389

HINT

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

Scheme 390

Scheme 390: INSPECTION PROCEDURE

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READ VALUE OF HAND HELD TESTER (VEHICLE SPEED) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST/ VEHICLE SPD. Drive the vehicle at 2,500 RPM or more. Result: B: Go to step 3 . C: CHECK FOR INTERMITTENT PROBLEM (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step.
CHECK WIRE HARNESS (VSS - ECM) Disconnect the V1 VSS connector. Disconnect the E6 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT SPEED SENSOR (VSS WAVEFORM) Check the waveform of the ECM when the vehicle speed is approximately 60 km/h (37 mph). OK: The correct waveforms are as shown. NG: REPLACE SPEED SENSOR OK: Go to next step.
INSPECT SPEED SENSOR (INSTALLATION) OK: The VSS is installed securely. NG: TIGHTEN SPEED SENSOR OK: Go to next step.
INSPECT SPEED SENSOR (RESISTANCE) Measure the resistance between the terminals of the VSS. Standard: 560 to 680 ohm NG: REPLACE SPEED SENSOR OK: Go to next step.
CHECK DTC Connect the hand-held tester to the CAN VIM. Then connect the CAN VIM to the DLC3. Drive the vehicle at 3,000 RPM or more for 10 seconds or more. Read DTCs Result: B: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) A: Go to next step. END

In addition to turning on the stop lamps, the stop lamp switch signals are used for a variety of engine, transmission and suspension functions. The stop lamp switch is designed with two complementary signal outputs, STP and ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.

Scheme 399

Scheme 399: CIRCUIT DESCRIPTION

HINT

Normal condition is as shown in the figure (Scheme 401) below. The signals can be read using the hand-held tester.

Scheme 400

Scheme 401

Scheme 401: WIRING DIAGRAM

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Scheme 403: INSPECTION PROCEDURE

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CHECK STOP LAMP SWITCH ASSY Check if the stop lights turn on and off normally when the brake pedal is depressed and released. NG: REPAIR OR REPLACE STOP LAMP SWITCH CIRCUIT OK: Go to next step.
INSPECT STOP LAMP SWITCH ASSY Measure the resistance between each pair of the terminals. Standard: NG: REPLACE STOP LAMP SWITCH ASSY OK: Go to next step.
READ VALUE OF HAND-HELD TESTER (DRIVER SIDE J/B ASSY ECU - ECM) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Turn the ignition switch ON. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ STOP LIGHT SW. Confirm the stop lamp switch status when the brake pedal depressed and released. Standard: Measure the voltage of the ECM when the brake pedal depressed and released. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NG: Go to next step.
CHECK WIRE HARNESS (STOP LAMP SWITCH - ECM) Disconnect the S19 stop lamp switch connector. Disconnect the E2 and E3 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The idle speed is controlled by the Electronic Throttle Control System (ETCS). The ETCS is comprised of: 1) a one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the Throttle Position (TP) sensor, which detects the opening angle of the throttle valve; 4) the Accelerator Pedal Position (APP) sensor, which detects the accelerator pedal position; 5) the ECM, which controls the ETCS. Based on the target idle speed, the ECM controls the throttle actuator to provide the proper throttle valve opening angle.

Scheme 411

Scheme 411: CIRCUIT DESCRIPTION

HINT

The detection of DTC P0505 may also be caused by: 1) the floor carpet overlapping onto the accelerator pedal, causing the accelerator pedal to be slightly depressed (TP to be slightly open); or 2) the accelerator pedal not being fully released.
Read freeze frame data using the hand - held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

Scheme 412

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0505) B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK CONNECTION OF PCV HOSE NG: REPAIR OR REPLACE PCV HOSE OK: Go to next step.
CHECK AIR INDUCTION SYSTEM NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM OK: Go to next step.
CHECK THROTTLE VALVE Check the throttle valve condition. NG: REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

REPLACE ECM (SEE REPLACEMENT )

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

The opening angle of the throttle valve is detected by the Throttle Position (TP) sensor which is mounted on the throttle body. The TP sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

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

Scheme 413

Scheme 413: CIRCUIT DESCRIPTION

HINT

Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
The throttle actuator current (THROTTLE MOT) and the throttle actuator duty ratio (THROTTLE OPN /THROTTLE CLS) can be read using hand-held tester. However the ECM shuts off the throttle actuator current when the ETCS malfunctions.

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INSPECT THROTTLE BODY ASSY (THROTTLE ACTUATOR RESISTANCE) Disconnect the T20 throttle actuator connector. Measure the resistance between the terminal 1 and 2 the throttle actuator. Standard: 0.3 to 100 ohm at 20°C (68°F) NG: REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (THROTTLE ACTUATOR - ECM) Disconnect the E5 ECM connector. Measure the resistance between the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT THROTTLE BODY Check between the throttle valve and the housing for foreign objects. NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY OK: Go to next step.
INSPECT THROTTLE VALVE Check if the throttle valve can open and close smoothly. NG: REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The throttle actuator is operated by the ECM and it opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the Throttle Position (TP) sensor, which is mounted on the throttle body. The TP sensor provides feedback to the ECM to control the throttle actuator and set the throttle valve angle in response to driver input.

HINT

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

Scheme 418

Scheme 418: CIRCUIT DESCRIPTION

HINT

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

Scheme 419

Scheme 419: INSPECTION PROCEDURE

Scheme 420

CHECK OTHER DTC OUTPUT B: GO TO RELEVANT DTC CHART (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step.
CHECK THROTTLE BODY ASSY (VISUALLY CHECK THROTTLE VALVE) Check for contamination between the throttle valve and the housing. If necessary, clean the throttle body. Also, check that the throttle valve moves smoothly. NG: REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) OK: Go to next step.
CHECK DTC OUTPUT Clear the DTC. Start the engine and fully depress/fully release the accelerator pedal quickly (fully open/fully closed the throttle valve). Read DTC. Result: B: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) A: Go to next step. CHECK FOR INTERMITTENT PROBLEM (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) )

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

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

HINT

The ETCS does not use a throttle cable.

Scheme 421

Scheme 421: CIRCUIT DESCRIPTION

Scheme 422

HINT

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

Scheme 423

Scheme 423: INSPECTION PROCEDURE

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INSPECT FUSE (ETCS) Remove the ETCS fuse from the engine room Relay Block (R/B). Measure the resistance in the ETCS fuse. Standard: Below 1 ohm If the fuse is open, replace the fuse. NG: CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED FUSE OK: Go to next step.
READ VALUE OF HAND-HELD TESTER (+BM VOLTAGE) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Turn the ignition switch ON. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ +BM. Standard: 9 to 14 V OK: CHECK FOR INTERMITTENT PROBLEM (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) NG: Go to next step.
CHECK WIRE HARNESS (ECM - BATTERY - ETCS FUSE) Check the wire harness between the ETCS fuse the battery positive terminal and the ECM. Remove the ETCS fuse from the engine room R/B. Disconnect the E5 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The Electronic Throttle Control System (ETCS) is composed of a throttle actuator that operates the throttle valve, a Throttle Position (TP) sensor that detects the opening angle of the throttle valve, an Accelerator Pedal Position (APP) sensor that detects the APP, and the ECM that controls the ETCS system.

The ECM operates the throttle actuator to position the throttle valve for proper response to driver inputs. The TP sensor detects the opening angle of the throttle valve and provides this signal to the ECM so that the ECM can regulate the throttle actuator.

Scheme 427

Scheme 427: CIRCUIT DESCRIPTION

HINT

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

Scheme 428

Scheme 428: INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P2119) B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
CHECK IF DTC OUTPUT REOCCUR Clear the DTC (see «DTC CHECK/CLEAR»(ref-209347-S24476769982005120900000) ). Allow the engine to idle for 15 seconds. Pull up the hand brake and move the shift lever to the D position. Fully depress the brake pedal and the accelerator pedal for 5 seconds. Read the DTC. HINT: Actual TP sensor voltage can be confirmed using the hand-held tester by entering the following menus: DATA LIST / ALL / THROTTLE POS #1. OK: No DTC output. NG: REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) ) OK: Go to next step. NORMAL

HINT

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

Scheme 429

Scheme 429: INSPECTION PROCEDURE

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READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2) Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Turn the ignition switch ON. Enter the following menus: DIAGNOSIS/ ENHANCED OBD II/ DATA LIST/ ALL/ ACCEL POS #1 and ACCEL POS #2. Read the ACCEL POS #1 and ACCEL POS #2 values. Standard: OK: Go to step 5 NG: Go to next step.
INSPECT ACCELERATOR PEDAL ROD ASSY (APP SENSOR) Disconnect the APP sensor connector. Measure the resistance between each terminal. Standard: Reconnect the APP sensor connector NG: REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-209387-S12564995032005121000000) ) OK: Go to next step.
INSPECT ECM (VCPA AND VCP2 VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E2 ECM connector. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
CHECK WIRE HARNESS (APP SENSOR - ECM) Disconnect the A19 APP sensor connector. Disconnect the E2 ECM connector. Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-209387-S12564995032005121000000) )
READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (see «DTC CHECK/CLEAR»(ref-209347-S24476769982005120900000) ). Allow the engine to idle for 15 seconds. Read the DTC. Result: B: CHECK FOR INTERMITTENT PROBLEM (See «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

HINT

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

Scheme 439

Scheme 439: INSPECTION PROCEDURE

Scheme 440

CHECK OTHER DTC OUTPUT B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) A: Go to next step.
REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-209387-S12564995032005121000000) ) NEXT
CHECK DTC (ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (see «DTC CHECK/CLEAR»(ref-209347-S24476769982005120900000) ). Allow the engine to idle for a minute. Race the engine several time. Read DTC. Result: B: CHECK FOR INTERMITTENT PROBLEM (see «CHECK FOR INTERMITTENT PROBLEMS»(ref-209347-S03364058202005120900000) ) A: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The engine control unit and the transmission control unit are located inside the ECM. The engine control unit intercommunicates with the transmission control ECU with the Controller Area Network (CAN).

If there is a problem in this intercommunication, the ECM sets a DTC.

Scheme 441

Scheme 441: CIRCUIT DESCRIPTION

REPLACE ECM (SEE REPLACEMENT )

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

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

Scheme 442

Scheme 442: WIRING DIAGRAM

Scheme 443

Scheme 443: INSPECTION PROCEDURE

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INSPECT ECM (+B VOLTAGE) Turn the ignition switch ON. Measure the voltage of the ECM. Standard: OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-209347-S16229319672005120900000) ) NG: Go to next step.
CHECK WIRE HARNESS (ECM - BODY GROUND) Disconnect the E6 ECM connector. Measure the resistance of the wire harness side connectors. Standard: Reconnect the ECM connector. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
INSPECT ECM (IGSW VOLTAGE) Turn the ignition switch ON. Measure the voltage of the ECM connectors. Standard: OK: Go to step 6 NG: Go to next step.
INSPECT FUSE (IGN) Remove the IGN fuse from the engine room Relay Block (R/B). Measure the resistance. Standard: Below 1 ohm Reinstall the IGN fuse. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE OK: Go to next step.
INSPECT IGNITION SWITCH Measure the resistance of the ignition switch. Standard: NG: REPAIR OR REPLACE IGNITION SWITCH OK: Go to next step. CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)
INSPECT ECM (MREL VOLTAGE) Turn the ignition switch ON. Measure the voltage of the ECM. Standard: NG: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) OK: Go to next step.
CHECK FUSE (EFI NO. 1) Remove the EFI NO. 1 fuse from the engine room R/B. Measure the resistance. Standard: Below 1 ohm NG: REPLACE FUSE (EFI NO. 1) OK: Go to next step.
INSPECT EFI MAIN RELAY Remove the EFI MAIN relay from the engine room R/B. Measure the resistance. Standard: NG: REPLACE EFI MAIN RELAY OK: Go to next step.
CHECK WIRE HARNESS (EFI MAIN RELAY - ECM, EFI MAIN RELAY - BODY GROUND) Check the wire harness between the EFI MAIN relay ECM. Remove the EFI MAIN relay from the engine room R/B. Disconnect the E3 ECM connector. Measure the resistance of the wire harness side connectors. Standard: Check the wire harness between the EFI MAIN relay and the body ground. Remove the EFI MAIN relay from the engine room R/B. Measure the resistance of the wire harness side connector. Standard: NG: CHECK AND REPAIR HARNESS A CONNECTOR (TERMINAL +B OF ECM -BATTERY POSITIVE TERMINAL) OK: Go to next step. REPAIR OR REPLACE HARNESS AND CONNECTOR

Refer to DTC P0230 on DTC P0230 FUEL PUMP PRIMARY CIRCUIT .

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

When the engine speed is 4,700 RPM or more and the throttle valve opening angle is 60° or more, the IACV is open (VSV: OFF). At all other times, the IACV is closed (VSV: ON).

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Scheme 461: CIRCUIT DESCRIPTION

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Scheme 463: WIRING DIAGRAM

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Scheme 464: INSPECTION PROCEDURE

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PERFORM ACTIVE TEST (ACIS VSV) Disconnect the vacuum hose from the port F on the ACIS VSV. Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Start the engine. Enter the following menus: ACTIVE TEST/ INTAKE CTL VSV 1. Operate the AICS VSV. Check the VSV's airflow when switching the VSV. Standard: OK: Go to step 4 NG: Go to next step.
CHECK VACUUM HOSES (INTAKE MANIFOLD - ACIS VSV - IACV) Check the condition of the vacuum hoses between the intake manifold, ACIS VSV and IACV. The vacuum hoses are connected securely. Vacuum hoses are not cracked or damaged. OK: The vacuum hoses are connected securely and not cracked or damaged. NG: REPAIR OR REPLACE VACUUM HOSES OK: Go to next step.
INSPECT INTAKE AIR CONTROL VALVE (See «INSPECTION»(ref-209390-S20598158272005121000000) ) NG: REPLACE INTAKE AIR CONTROL VALVE OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )
INSPECT ACIS VSV (OPERATION) Check that air flows from port E to the air filter. Apply battery positive voltage across the terminals. Check that air flows from port E to port F. NG: REPLACE ACIS VSV OK: Go to next step.
CHECK WIRE HARNESS (ECM - ACIS VSV - EFI RELAY) Check the wire harness between the ACIS VSV and the ECM. Disconnect the V2 ACIS VSV connector. Disconnect the E4 ECM connector. Measure the resistance of the wire harness side connectors. Standard: Check the wire harness between the ACIS VSV and the EFI MAIN relay. Disconnect the V2 ACIS VSV connector. Remove the EFI MAIN relay from the engine room Relay Block (R/B). Measure the resistance of the wire harness side connectors. Standard: NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction.

The instrument panel GAUGE fuse provides the circuit with power and the ECM provides the circuit ground that illuminates the MIL.

MIL operations should be checked visually

The MIL should be illuminated when the ignition switch is turned ON. If the MIL is always ON or OFF, use the hand-held tester and follow the procedures below to determine the cause of the problem.

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

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Scheme 474: WIRING DIAGRAM

HINT

Troubleshoot each trouble symptom in accordance with the chart below.

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Scheme 475: INSPECTION PROCEDURE

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CLEAR DTC Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Read the DTC (see «DTC CHECK/CLEAR»(ref-209347-S24476769982005120900000) ). Clear the DTC (see «DTC CHECK/CLEAR»(ref-209347-S24476769982005120900000) ). Check that MIL is not illuminated. OK: MIL is not illuminated. OK: REPAIR CIRCUIT INDICATED BY OUTPUT DTC (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209347-S25990035302005120900000) ) NG: Go to next step.
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E2 ECM connector. Turn the ignition switch ON. Check that MIL is not illuminated. OK: MIL is not illuminated. OK: REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) ) NG: Go to next step. CHECK AND REPAIR HARNESS AND CONNECTOR
CHECK THAT MIL IS ILLUMINATED Check that the MIL is illuminated when turning the ignition switch ON. OK: MIL is illuminated. OK: SYSTEM OK NG: Go to next step.
INSPECT COMBINATION METER ASSY (MIL CIRCUIT) See the combination meter troubleshooting section in «PRECAUTION»(ref-209364-S36091859592005120900000) . NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY OK: Go to next step. CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)

Sfi System - Diagnosis: Diagnosis Lexus LS III рестайлинг

BASIC INSPECTION

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DIAGNOSTIC TROUBLE CODE TABLE

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INSPECTION PROCEDURE

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CIRCUIT DESCRIPTION

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