Sfi System - Diagnosis: Diagnosis Lexus RX II

HOW TO PROCEED WITH TROUBLESHOOTING

The hand-held tester can be used at step 3, 4, 5, 7, 10.

1. VEHICLE BROUGHT TO WORKSHOP
2. CUSTOMER PROBLEM ANALYSIS (See «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-209540-S25276269912005121000000) )
3. CONNECT HAND-HELD TESTER TO DLC3 HINT: If the display indicates a communication fault in the tool, inspect DLC3.
4. CHECK DTC AND FREEZE FRAME DATA (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) HINT: Record or print DTC and freeze frame data, if needed.
5. CLEAR DTC AND FREEZE FRAME DATA (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
6. VISUAL INSPECTION
7. SETTING CHECK (TEST) MODE DIAGNOSIS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
8. PROBLEM SYMPTOM CONFIRMATION HINT: If the engine does not start, perform steps 10 and 12 first. IF MALFUNCTION OCCURS, GO TO STEP 10 IF MALFUNCTION DOES NOT OCCUR, GO TO NEXT STEP.
9. SYMPTOM SIMULATION
10. DTC CHECK (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) IF MALFUNCTION CODE EXISTS, GO TO NEXT STEP. IF MALFUNCTION CODE DOES NOT EXIST, GO TO STEP 12 .
11. DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ) GO TO STEP 14
12. BASIC INSPECTION (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) IF WRONG PARTS ARE CONFIRMED, GO TO STEP 17 IF WRONG PARTS ARE NOT CONFIRMED, GO TO NEXT STEP.
13. PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000) ) IF WRONG CIRCUIT IS CONFIRMED, GO TO NEXT STEP. IF WRONG PART IS CONFIRMED, GO TO STEP 17 .
14. CHECK ECM POWER SOURCE CIRCUIT (See «ECM POWER SOURCE CIRCUIT»(ref-209540-S10460431282005121000000) )
15. CIRCUIT INSPECTION IF MALFUNCTION IS CONFIRMED, GO TO STEP 18 . IF MALFUNCTION IS NOT CONFIRMED, GO TO NEXT STEP.
16. CHECK FOR INTERMITTENT PROBLEM (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) GO TO STEP 18
17. PARTS INSPECTION
18. IDENTIFICATION OF PROBLEM
19. ADJUSTMENT, REPAIR
20. CONFIRMATION TEST END

BASIC INSPECTION

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

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1. CHECK BATTERY VOLTAGE NOTE: Carry out this check with the engine stopped and ignition switch OFF. OK: GO TO NEXT STEP. NG: CHARGE OR REPLACE BATTERY
2. CHECK IF ENGINE WILL CRANK OK: GO TO NEXT STEP. NG: PROCEED TO PROBLEM SYMPTOMS TABLE ON «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000)
3. CHECK IF ENGINE STARTS OK: GO TO NEXT STEP. NG: GO TO STEP 7
4. CHECK AIR FILTER Visually check that the air filter is not excessively dirty or oily. NOTE: If necessary, clean the filter with compressed air. First blow from the inside thoroughly, then blow from the outside of the filter. OK: GO TO NEXT STEP. NG: CLEAN OR REPLACE
5. CHECK IDLE SPEED (See step 8 under «INSPECTION»(ref-209552-S22544091772005121000000) ) OK: GO TO NEXT STEP. NG: PROCEED TO PROBLEM SYMPTOMS TABLE ON «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000)
6. CHECK IGNITION TIMING (See step 7 under «INSPECTION»(ref-209552-S22544091772005121000000) ) OK: PROCEED TO PROBLEM SYMPTOMS TABLE ON «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000) NG: PROCEED TO AND CONTINUE TO TROUBLESHOOT
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) OK: GO TO NEXT STEP. NG: PROCEED TO «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) AND CONTINUE TO TROUBLESHOOT
8. CHECK FOR SPARK (See «INSPECTION»(ref-209572-S02268073112005121000000) ) OK: PROCEED TO «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000) NG: PROCEED TO «IGNITION SYSTEM (3MZ-FE)»(ref-209572-S04237228792005121000000) AND CONTINUE TO TROUBLESHOOT

DIAGNOSTIC TROUBLE CODE CHART

HINT

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

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

DIAGNOSTIC TROUBLE CODE CHART

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CIRCUIT DESCRIPTION

The Variable Valve Timing (VVT) system includes the ECM, the Oil Control Valve (OCV) and the VVT controller. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV, regulates the oil pressure supplied to the VVT controller. Camshaft timing control is performed based on engine operation conditions such as intake air volume, throttle position and engine coolant temperature.

The ECM controls the OCV, based on the signals output from the sensors. The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As result, the relative position between the camshaft and the crankshaft is optimized, and the engine torque improves, fuel economy improves, and exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing is verified by the ECM.

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INSPECTION PROCEDURE

HINT

1. If DTC P0010 is displayed, check the right bank VVT system circuit.
2. If DTC P0020 is displayed, check the left bank VVT system circuit.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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1. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE OCV) Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/VVT CTRL B1 or VVT CTRL B2". Check the engine speed when operating the OCV by the hand-held tester. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: GO TO NEXT STEP.
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) (See «INSPECTION»(ref-239231-S37888103222006072700000) ) . OK: GO TO NEXT STEP. NG: REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY
3. CHECK ECM (OCV SIGNAL) During idling, check the waveform between the specified terminals of the E7 ECM connector using the oscilloscope. Standard: HINT: The waveform frequency (A) is lengthened as the engine speed becomes higher. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE (OCV) - ECM) Disconnect the V6 or V7 OCV connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the OCV connector. Reconnect the ECM connector. OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OBDII scan tool (excluding hand-held tester)

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1. CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OPERATE OCV) Disconnect the V6 or V7 OCV connector. Apply positive battery voltage between the terminals of the OCV. Check the engine speed. Standard: Engine speed is rough idle or engine is stalled. Reconnect the OCV connector. OK: GO TO NEXT STEP. NG REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY
2. CHECK ECM (OCV SIGNAL) During idling, check the waveform between the specified terminals of the E7 ECM connector using the oscilloscope. Standard: HINT: The waveform frequency (A) is lengthened as the engine speed becomes higher. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
3. CHECK HARNESS AND CONNECTOR (CAMSHAFT TIMING OIL CONTROL VALVE (OCV) - ECM) Disconnect the V6 or V7 OCV connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the OCV connector. Reconnect the ECM connector. OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Refer to DTC P0010 on DTC P0010 CAMSHAFT POSITION "A" ACTUATOR CIRCUIT (BANK 1), DTC P0020 CAMSHAFT POSITION "A" ACTUATOR CIRCUIT (BANK 2) .

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HINT

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1. If DTC P0011, P0012 is displayed, check the right bank VVT system circuit.
2. If DTC P0021, P0022 is displayed, check the left bank VVT system circuit.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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1. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPING TEETH OF TIMING BELT) (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) OK: GO TO NEXT STEP. NG: ADJUST VALVE TIMING (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) )
2. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE OCV) Connect the hand-held tester to the DLC3. Start the engine and warm it up. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/VVT CTRL B1 or VVT CTRL B2". Check the engine speed when operating the OCV by the hand-held tester. Standard: OK: GO TO NEXT STEP. NG: Go to step 4
3. CHECK IF DTC OUTPUTS REOCCUR Clear the DTC. Operate the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for more than 60 sec. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. Read output DTC using the hand-held tester. Standard: No DTC output. HINT: * DTCs P0011, P0021 or P0022 are output when a foreign object in engine oil is caught in some part of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem. OK: VVT SYSTEM OK* NG: GO TO NEXT STEP.
4. CHECK ECM (OCV SIGNAL) During idling, check the waveform between the specified terminals of the E7 ECM connector using the oscilloscope. Standard: HINT: The waveform frequency (A) is lengthened as the engine speed becomes higher. OK: GO TO STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
5. CHECK OIL CONTROL VALVE FILTER OK: GO TO NEXT STEP. NG: REPLACE OIL CONTROL VALVE FILTER
6. CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) (See «INSPECTION»(ref-239231-S37888103222006072700000) ) OK: Go to step 8 NG: GO TO NEXT STEP.
7. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) GO TO NEXT STEP.
8. CHECK CAMSHAFT TIMING GEAR ASSY (See (RH) «REPLACEMENT»(ref-209552-S22572406492005121000000) or (LH) «REPLACEMENT»(ref-209552-S33614215472005121000000) ) OK: Go to step 10 NG: GO TO NEXT STEP.
9. REPLACE CAMSHAFT TIMING GEAR ASSY GO TO NEXT STEP.
10. CHECK FOR BLOCKAGE (OCV, OIL CHECK VALVE AND OIL HOLE) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
11. CHECK IF DTC OUTPUTS REOCCUR Clear the DTC. Operate the hand-held tester to erase the codes, or disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for more than 60 sec. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. Read output DTC using the hand-held tester. Standard: No DTC output. HINT: *: DTCs P0011, P0021 or P0022 is output when a foreign object in engine oil is caught in some part of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem. OK: VVT SYSTEM OK* NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )

OBDII scan tool (excluding hand-held tester)

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1. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPING TEETH OF TIMING BELT) (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) OK: ADJUST VALVE TIMING (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) NG: GO TO NEXT STEP.
2. CHECK OPERATION OF OCV Start the engine. Check the engine speed with (1) and (2). Disconnect the V6 or V7 OCV connector. Apply battery positive voltage between the terminals of the OCV. Result: Reconnect the OCV connector. A: GO TO NEXT STEP. B: Go to step 4
3. CHECK IF DTC OUTPUTS REOCCUR Clear the DTC. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for more than 60 sec. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. Read output DTC using the OBD II scan tool. Standard: No DTC output. HINT: *: DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in engine oil is caught in some part of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem. OK VVT SYSTEM OK* NG: GO TO NEXT STEP.
4. CHECK ECM (OCV SIGNAL) During idling, check the waveform between the specified terminals of the E7 ECM connector using the oscilloscope. Standard: HINT: The waveform frequency (A) is lengthened as the engine speed becomes higher. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
5. CHECK OIL CONTROL VALVE FILTER OK: GO TO NEXT STEP. NG: REPLACE OIL CONTROL VALVE FILTER
6. CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) (See «INSPECTION»(ref-239231-S37888103222006072700000) ) OK: Go to step 8 NG: GO TO NEXT STEP.
7. REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSY (OCV) GO TO NEXT STEP.
8. CHECK CAMSHAFT TIMING GEAR ASSY (See (RH) «REPLACEMENT»(ref-209552-S22572406492005121000000) or (LH) «REPLACEMENT»(ref-209552-S33614215472005121000000) ) OK: Go to step 10 NG: GO TO NEXT STEP.
9. REPLACE CAMSHAFT TIMING GEAR ASSY GO TO NEXT STEP.
10. CHECK FOR BLOCKAGE (OCV, OIL CHECK VALVE AND OIL HOLE) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
11. CHECK IF DTC OUTPUTS REOCCUR Clear the DTC. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for more than 60 sec. Start and warm up the engine. Drive the vehicle around for 10 minutes or more. Read output DTC using the OBD II scan tool. Standard: No DTC output. HINT: *: DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in engine oil is caught in some part of the system. These codes will stay registered even if the system returns to normal after a short time. These foreign objects are then captured by the oil filter, thus eliminating the source of the problem. OK: VVT SYSTEM OK* NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )

Refer to CIRCUIT DESCRIPTION under DTC P0335 CRANKSHAFT POSITION SENSOR "A" CIRCUIT, DTC P0339 CRANKSHAFT POSITION SENSOR "A" CIRCUIT INTERMITTENT .

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HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

1. CHECK VALVE TIMING (CHECK FOR LOOSE AND JUMPING TEETH OF TIMING BELT) See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: ADJUST VALVE TIMING (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) (REPAIR OR REPLACE TIMING BELT)

HINT

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

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1. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the A3 or A4 A/F sensor connector. Measure the resistance between the terminals of the A/F sensor. Resistance: Reconnect the A/F sensor connector. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
2. INSPECT AIR FUEL RATIO SENSOR HEATER RELAY Remove the A/F sensor heater relay from the engine room R/B. Inspect the A/F sensor heater relay. Standard: Reinstall the A/F sensor heater relay. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR HEATER RELAY
3. INSPECT ECM (HA1A OR HA2A VOLTAGE) Turn the ignition switch ON. Measure the voltage between the applicable terminals of the E7 and E9 ECM connectors. Standard: HINT: The HA1A stands for the A/F sensor bank 1 sensor 1. The HA2A stands for the A/F sensor bank 2 sensor 1. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM, A/F SENSOR - A/F SENSOR HEATER RELAY) Check the harness and the connector between the ECM and the A/F sensor connectors. Disconnect the A3 or A4 A/F sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reconnect the ECM connector. Check the harness and connector between the A/F sensor connector and the A/F sensor heater relay. Disconnect the A3 or A4 A/F sensor connector. Remove the A/F sensor heater relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reinstall the A/F sensor heater relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Refer to CIRCUIT DESCRIPTION under DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2), DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2) .

HINT

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

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HINT

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

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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1. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H11 or H20 heated oxygen sensor connector. Measure the resistance between the terminals of the heated oxygen sensor connector. Standard (Bank 1, 2 sensor 2): Reconnect the heated oxygen sensor connector. OK: GO TO NEXT STEP. NG: REPLACE HEATED OXYGEN SENSOR
2. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Inspect the EFI relay. Standard: Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPLACE EFI RELAY
3. INSPECT ECM (HT1B OR HT2B VOLTAGE) Turn the ignition switch ON. Measure the voltage between the applicable terminals the E8 and E9 ECM connectors. Standard: HINT: The HT1B stands for the heated oxygen sensor bank 1 sensor 2. The HT2B stands for the heated oxygen sensor bank 2 sensor 2. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM, HEATED OXYGEN SENSOR - EFI RELAY) Check the harness and the connector between the ECM and the heated oxygen sensor connectors. Disconnect the H11 or H20 heated oxygen sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. Check the harness and the connector between the heated oxygen sensor connector and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the H11 or H20 heated oxygen sensor connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the heated oxygen sensor connector. Reinstall the EFI relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

The MAF (Mass Air Flow) sensor 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 sensor, 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 thermister, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components in the MAF sensor. The voltage level is proportional to the airflow through the sensor and the ECM interprets this voltage as the intake air amount.

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

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HINT

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

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HINT

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

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1. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (MASS AIR FLOW RATE) Connect the hand-held tester or the OBD II scan tool to the DLC3. Start the engine. Push the hand-held tester or the OBD II scan tool main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF" and read its value displayed on the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: Go to step 6 C: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
2. INSPECT MASS AIR FLOW SENSOR (POWER SOURCE) Turn the ignition switch ON. Disconnect the M1 mass air flow sensor connector. Measure the voltage between the terminal of the wire harness side connector and the body ground. Standard: Reconnect the mass air flow sensor connector. OK: GO TO NEXT STEP. NG: Go to step 5
3. INSPECT ECM (VG VOLTAGE) Start the engine. Measure the voltage between the specified terminals of the E8 ECM connector. HINT: The shift position should be P or N and the A/C switch should be turned OFF. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW SENSOR - ECM) Disconnect the M1 mass air flow sensor connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the mass air flow sensor connector. Reconnect the ECM connector. OK: REPLACE MASS AIR FLOW SENSOR NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
5. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW SENSOR - EFI RELAY) Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the M1 mass air flow sensor connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the mass air flow sensor connector. Reinstall the EFI relay. OK: INSPECT ECM POWER SOURCE CIRCUIT (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
6. INSPECT ECM (SENSOR GROUND) Check the resistance between the specified terminal of the E8 ECM connector and the body ground. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
7. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW SENSOR - ECM) Disconnect the M1 mass air flow sensor connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the mass air flow sensor connector. Reconnect the ECM connector. OK: REPLACE MASS AIR FLOW SENSOR NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Refer to CIRCUIT DESCRIPTION under 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 228

HINT

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

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0101) Read the DTC using the hand-held tester or the OBD II scan tool. HINT: If any other codes besides P0101 are output, perform the troubleshooting for those first. IF P0101 AND OTHER DTCS ARE OUTPUT, GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ) IF ONLY P0101 IS OUTPUT, REPLACE MASS AIR FLOW SENSOR

Scheme 229

The intake air temperature (IAT) sensor, mounted on the mass air flow (MAF) sensor, monitors the intake air temperature. The IAT sensor has a thermistor that varies its resistance depending on the temperature of the intake air. When the air temperature is low, the resistance in the thermistor increases. When the temperature is high, the resistance drops. The variations in resistance are reflected as voltage changes to the ECM terminal. (Scheme 229)

The intake air temperature sensor is connected to the ECM see scheme 160 The 5 V power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA (THAR) via resistor R.

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

Scheme 230

HINT

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

Scheme 231

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 232

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Scheme 239

1. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR TEMPERATURE) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature: Same value as the actual intake air temperature. Result: HINT: If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40°C (-40°F). If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more. A: GO TO NEXT STEP. B: Go to step 4 C: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the M1 mass air flow sensor connector. Connect terminals THA and E2 of the mass air flow sensor wire harness side connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: 140°C (284°F) or more Reconnect the mass air flow sensor connector. OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE MASS AIR FLOW SENSOR NG: GO TO NEXT STEP.
3. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN ECM) Disconnect the M1 mass air flow sensor connector. Connect terminals THA and E2 of the E8 ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: 140°C (284°F) or more Reconnect the mass air flow sensor connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the M1 mass air flow sensor connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: -40°C (-40°F) Reconnect the mass air flow sensor connector. OK: REPLACE MASS AIR FLOW SENSOR NG: GO TO NEXT STEP.
5. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM) Disconnect the E8 ECM connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: -40°C (-40°F) Reconnect the ECM connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )

A thermistor is built in the engine coolant temperature 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 as those of the intake air temperature sensor.

HINT

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

Scheme 240

HINT

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

Scheme 241

HINT

1. If different DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 242

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1. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (ENGINE COOLANT TEMPERATURE) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature: Same value as the actual engine coolant temperature. Result: HINT: If there is an open circuit, the hand-held tester or the OBD II scan tool indicates -40° C (-40°F). If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more A: GO TO NEXT STEP. B: Go to step 4 C: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN WIRE HARNESS) Disconnect the E2 engine coolant temperature sensor connector. Connect terminals 1 and 2 of the engine coolant temperature sensor wire harness side connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: 140°C (284°F) or more Reconnect the engine coolant temperature sensor connector. OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMP. SENSOR NG: GO TO NEXT STEP.
3. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN ECM) Disconnect the E2 engine coolant temperature sensor connector. Connect terminals THW and E2 of the E8 ECM connector. HINT: Before checking, do a visual and contact pressure check for the ECM connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: 140°C (284°F) or more Reconnect the engine coolant temperature sensor connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E2 engine coolant temperature sensor connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature value: -40°C (-40°F) Reconnect the engine coolant temperature sensor connector. OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR NG: GO TO NEXT STEP.
5. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM) Disconnect the E8 ECM connector. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature: -40°C (-40°F) Reconnect the ECM connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )

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

Scheme 250

HINT

1. If DTCs "P0115, P0116, P0117, and P0125" are output simultaneously, engine coolant temperature sensor circuit may be open or shorted. Perform the troubleshooting of DTC "P0115, P0117 or P0118" first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

HINT

1. If different DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Hand-held tester

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1. READ VALUE OF HAND-HELD TESTER (THROTTLE POS AND THROTTLE POS #2) Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ETCS/THROTTLE POS and THROTTLE POS #2" and read its value displayed on the hand-held tester. Result: A: GO TO NEXT STEP. B: Go to step 5
2. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the T2 throttle body connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the throttle body connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT ECM (VC VOLTAGE) Disconnect the T2 throttle body connector. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E8 ECM connector. Standard: Reconnect the throttle body connector. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-239231-S12742078002006072700000) ) GO TO NEXT STEP.
5. READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) Start the engine. Run the engine at idle for 15 seconds or more. Read the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Result: A: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) B: SYSTEM OK

OBD II scan tool (excluding hand-held tester)

Scheme 260

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1. CHECK HARNESS AND CONNECTOR (THROTTLE POSITION SENSOR - ECM) Disconnect the T2 throttle body connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the throttle body connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. INSPECT ECM (VC VOLTAGE) Disconnect the T2 throttle body connector. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E8 ECM connector. Standard: Reconnect the throttle body connector. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
3. REPLACE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-239231-S12742078002006072700000) ) GO TO NEXT STEP.
4. READ OUTPUT DTC (THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Start the engine. Run the engine at idle for 15 seconds or more. Read the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Result: A: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) B: SYSTEM OK

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

REPLACE THROTTLE BODY ASSY (See REPLACEMENT )

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

Scheme 268

HINT

1. If DTCs "P0115, P0116, P0117, P0118 and P0125" are output simultaneously, engine coolant temperature sensor circuit may be open or short. Perform the troubleshooting of DTC "P0115, P0117 or P0118" first.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc, at the time of the malfunction.

Scheme 269

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0125) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides "P0125" is output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. INSPECT THERMOSTAT (See «INSPECTION»(ref-209566-S27169577242005121000000) ) OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR NG: REPLACE THERMOSTAT (See «REPLACEMENT»(ref-209570-S17128042612005121000000) )

HINT

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

Scheme 270

1. INSPECT THERMOSTAT (See «INSPECTION»(ref-209566-S27169577242005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE THERMOSTAT (See «REPLACEMENT»(ref-209570-S17128042612005121000000) )
2. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0128) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides P0128 are output, perform the troubleshooting for those DTCs first. A: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )

The heated oxygen sensor is used to monitor oxygen concentration in the exhaust. For optimum catalytic converter operation, the air fuel mixture must be maintained near the ideal "stoichiometric" ratio. The oxygen sensor output voltage changes suddenly at the stoichiometric ratio. The ECM adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric.

When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust gas increases. And the heated oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).

When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen will be vanished from the exhaust gas. And the heated oxygen sensor informs the ECM of the RICH condition (high voltage, i.e. more than 0.45 V).

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

Scheme 271

Scheme 272

HINT

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

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing the "A/F CONTROL" ACTIVE TEST (A/F sensor, heated oxygen sensor or other trouble areas can be distinguished).

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

Note. There is a few seconds delay in the A/F sensor output and there is about 20 seconds delay in the heated oxygen sensor output.

Scheme 273

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

For displaying the graph indication, enter "ACTIVE TEST/A/F CONTROL/USER DATA", then select "AFS B1S1 and O2S B1S2" or "AFS B2SI and O2S B2S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc, at the time of the malfunction.

Scheme 274

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1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0136 AND/OR P0156) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides "P0136 and/or "P0156" are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT VOLTAGE OF HEATED OXYGEN SENSOR) After warming up the engine, run the engine at 2,500 RPM for 3 minutes. Read the output voltage of the heated oxygen sensor when the engine RPM is suddenly increased. HINT: Quickly accelerate the engine to 4,000 RPM 3 times by using the accelerator pedal. Heated oxygen sensor output voltage: Alternates 0.4 V or less and 0.5 V or more. OK: Go to step 6 NG: GO TO NEXT STEP.
3. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Disconnect the H11 or H20 heated oxygen sensor connector. Measure the resistance between the terminals of the heated oxygen sensor connector. Standard (Bank 1, 2 sensor 2): Reconnect the heated oxygen sensor connector. OK: GO TO NEXT STEP. NG: REPLACE HEATED OXYGEN SENSOR
4. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Inspect the EFI relay. Standard: Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPLACE EFI RELAY
5. CHECK HARNESS AND CONNECTOR (HEATED OXYGEN SENSOR - ECM) Disconnect the H11 or H20 heated oxygen sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the heated oxygen sensor connector. Reconnect the ECM connector. OK: REPLACE HEATED OXYGEN SENSOR NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
6. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S38395284612005121000000) HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO TO NEXT STEP.
7. READ OUTPUT DTC (DTC P0136 AND/OR P0156 ARE OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) B: 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 the stoichiometric air-fuel ratio. The signal from the A/F sensor indicates whether the air-fuel ratio is RICH or LEAN compared to the stoichiometric air-fuel ratio. This variance triggers a reduction in the fuel volume if the air-fuel ratio is RICH, and an increase in the fuel volume if it is LEAN.

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

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

Scheme 285

HINT

1. When DTC "P0171 or P0174" is recorded, the actual air-fuel ratio is on the LEAN side. When DTC "P0172 or P0175" is recorded, the actual air-fuel ratio is on the RICH side.
2. If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC "P0171" or "P0174" is recorded. The MIL then comes on.
3. If the total of the short-term fuel trim value and long-term fuel trim value is within +/- 35% (engine coolant temperature is more than 75 °C (167°F), the system is functioning normally.

Scheme 286

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

Example

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

DTC P0171 indicates that the air-fuel mixture is extremely LEAN, and P0172 indicates extremely RICH.

Scheme 287

Scheme 288

Scheme 289

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing the "A/F CONTROL" ACTIVE TEST (A/F sensor, heated oxygen sensor or other trouble areas can be distinguished).

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

Note. There is a few seconds delay in the A/F sensor output and there is about 20 seconds delay in the heated oxygen sensor output.

Scheme 290

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

For displaying the graph indication, enter "ACTIVE TEST/ A/F CONTROL/USER DATA", then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
2. A high A/F sensor voltage could be caused by a rich air fuel mixture. Check the conditions that would cause the engine to run rich.
3. A low A/F sensor voltage could be caused by a lean air fuel mixture. Check the conditions that would cause the engine to run lean.

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1. CHECK AIR INDUCTION SYSTEM Check for vacuum leaks in air induction system. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM
2. CHECK CONNECTION OF PCV HOSE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE PCV HOSE
3. INSPECT FUEL INJECTOR ASSY (INJECTION AND VOLUME) (See «INSPECTION»(ref-209549-S20929805652005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE FUEL INJECTOR ASSY (See «FUEL INJECTOR ASSY (3MZ-FE)»(ref-209549-S20520276172005121000000) )
4. INSPECT MASS AIR FLOW SENSOR Remove the mass air flow sensor. Inspect output voltage. Apply battery voltage across terminals +B and E2G. Connect the positive (+) tester prove to terminal VG, and negative (-) tester prove to terminal E2G. Blow air into the mass air flow sensor, and check that the voltage fluctuates. Inspect resistance. Measure the resistance between terminals of the intake air temperature sensor. Resistance: Reinstall the mass air flow sensor. OK: GO TO NEXT STEP. NG: REPLACE MASS AIR FLOW SENSOR
5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR (RESISTANCE) Remove the engine coolant temperature sensor. Measure the resistance between the terminals of the engine coolant temperature sensor. Resistance: NOTE: In case of checking the engine coolant temperature sensor in the water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test. Reinstall the engine coolant temperature sensor. OK: GO TO NEXT STEP. NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR
6. CHECK FOR SPARK AND IGNITION (See «IGNITION SYSTEM (3MZ-FE)»(ref-209572-S04237228792005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) Check the fuel pressure (high or low pressure). OK: GO TO NEXT STEP. NG: REPLACE FUEL SYSTEM
8. CHECK FOR EXHAUST GAS LEAKAGE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT (See «EXHAUST PIPE ASSY (3MZ-FE)»(ref-209565-S10018128422005121000000) )
9. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (OUTPUT VOLTAGE OF AIR FUEL RATIO SENSOR (BANK 1, 2 SENSOR 1)) Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensors (bank 1, 2 sensor 1) by running the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage output on the OBD II scan tool or the hand-held tester. Hand-held tester only: Select the "ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1 or AFS B2 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage output under the following conditions: Allow engine to idle for 30 seconds. Running the engine at approximately 2,500 RPM (when engine RPM is not suddenly changed). Raise the engine speed to 4,000 RPM and quickly release the accelerator pedal so that the throttle is fully closed. Standard: Condition (1) and (2) Voltage change in the vicinity of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustration. Condition (3) A/F sensor voltage increases to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the illustration. *: Voltage when using the OBD II scan tool. HINT: Whenever the output voltage of the A/F sensor remains at approximately 3.3 V (0.660 V)* (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F sensor voltage output. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to learn the closed throttle position. When the vehicle is driven: You may notice that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor is functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F sensor or ECM, you will observe a constant voltage. *: Voltage when using the OBD II scan tool. OK: Go to step 17 NG: GO TO NEXT STEP.
10. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Disconnect the A3 or A4 A/F sensor connector. Measure the resistance between the terminals of the sensor. Resistance: Reconnect the A/F sensor connector. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
11. INSPECT AIR FUEL RATIO SENSOR HEATER RELAY Remove the A/F sensor heater relay from the engine room R/B. Inspect the A/F sensor heater relay. Standard: Reinstall the A/F sensor heater relay. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR HEATER RELAY
12. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) Disconnect the A3 or A4 A/F sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
13. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
14. PERFORM CONFIRMATION DRIVING PATTERN Clear the DTCs. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for 60 sec. or more. Connect the hand-held tester to the DLC3. Switch the hand-held tester from the normal mode to the check mode (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Start the engine and warm it up with all the accessory switches OFF. Drive the vehicle at 38 to 75 mph (60 to 120 km/h) and engine speed at 1,400 to 3,200 RPM for 3 to 5 minutes. HINT: If a malfunction exists, the MIL will be illuminated during step (e). NOTE: If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (d) and (e), then perform step (e) again. GO TO NEXT STEP.
15. READ OUTPUT DTC (DTC P0171, P0172, P0174 AND/OR P0175 ARE OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND PERFORM CONFIRMATION DRIVING PATTERN (Refer to step 14 )
16. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL (DTCS P0171, P0172, P0174 AND/OR P0175) NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
17. PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). GO TO NEXT STEP.
18. READ OUTPUT DTC (DTC P0171, P0172, P0174 AND/OR P0175 ARE OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: Go to step 22
19. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
20. PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern (Refer to step 14 ). GO TO NEXT STEP.
21. READ OUTPUT DTC (DTC P0171, P0172, P0174 AND/OR P0175 ARE OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND PERFORM CONFIRMATION DRIVING PATTERN (Refer to step 14 )
22. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL (DTCS P0171, P0172, P0174 AND/OR P0175) NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )

When a misfire occurs in the engine, hydrocarbons (HC) enter the exhaust in high concentrations. If this HC concentration is high enough, there could be an increase in exhaust emissions levels. High concentrations of HC passing through the catalyst also cause to temperature of the catalyst to increase, possibly damaging the catalyst. To prevent this increase in emissions and limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the catalyst reaches a point of thermal degradation, the ECM will blink the MIL. For monitoring misfire, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. The misfire counter increments when crankshaft rotation speed variations exceed threshold values.

The ECM illuminates the MIL if the misfiring rate exceeds a threshold value and could cause emissions deterioration.

Scheme 309

HINT

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

Reference: Inspection using the oscilloscope.

With the engine idling, check the waveform between terminals #10 to #60 and E01 of the ECM connector.

HINT

The correct waveform is as shown.

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The ECM illuminates the MIL if the misfiring rate exceeds a threshold value and could cause emissions deterioration.

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

(2 trip detection logic)

The MIL blinks when "percent misfire causing catalyst damage" per 200 revolution met 3 times (1 time if the engine RPM is in high range).

(MIL blinks immediately)

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HINT

1. If DTCs besides misfire are memorized simultaneously, first perform troubleshooting for them.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
3. 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-209540-S09778778532005121000000) ).
4. On 6 and 8 cylinder engines, misfiring cylinder identification is disabled at high engine speed and only a general misfire fault code P0300 is stored instead of a cylinder specific misfire fault code (i. e., P0301 - P0308). Under the following conditions, only P0300 code may be stored. Misfire starts in the high engine speed area or misfire occurs only in the high engine speed area. Therefore, when a general misfire fault code (i.e., P0300) is only stored, erase the DTCs after read freeze frame data with the hand-held tester or OBD II scan tool. Start the engine and drive the confirmation pattern (See «CONFIRMATION DRIVING PATTERN»(ref-209540-S09778778532005121000000) ) and read the value of the misfire ratio for each cylinder (or DTC). Perform the repair correspond to the high misfire ratio cylinder (or the misfiring cylinder indicated by DTC). After completing the repair, confirm no misfire is occurring by driving the confirmation pattern.
5. When either of SHORT FT #1, LONG FT #1, SHORT FT #2 OR LONG FT #2 in the freeze frame data is over the range of +/- 20%, there is a possibility that the air-fuel ratio is inclining either to RICH (-20% or less) or LEAN (+20% or more).
6. When COOLANT TEMP in the freeze frame data is less than 80°C (176°F), there is a possibility of misfire only during engine warm up.
7. If the misfire cannot be reproduced, the reason may be because of the driving the vehicle with lack of fuel, the use of improper fuel, a stain on the ignition plug, etc.
8. Be sure to check the value on the misfire counter after the repair.

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1. CHECK OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides "P0300, P0301, P0302, P0303, P0304, P0305 or P0306" are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. CHECK WIRE HARNESS, CONNECTOR AND VACUUM HOSE IN ENGINE ROOM Check the connection conditions of the wire harness and connector. Check for the disconnection, piping and break of the vacuum hose. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE, THEN CONFIRM THAT THERE IS NO MISFIRE
3. CHECK CONNECTION OF PCV HOSE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE PCV HOSE
4. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (NUMBER OF MISFIRE) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Start the engine. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/CYL#1-CYL#6". Read the number of misfire on the hand-held tester or the OBD II scan tool. HINT: When a misfire is not reproduced, be sure to branch below based on the stored DTC. Result: A: GO TO NEXT STEP. B: Go to step 15
5. CHECK SPARK PLUG AND SPARK OF MISFIRING CYLINDER Remove the ignition coil assy. Remove the spark plug. Check the spark plug type. Recommended spark plug: Check the spark plug electrode gap. Electrode gap: 1.0 to 1.1 mm (0.039 to 0.043 in.) Maximum electrode gap: 1.3 mm (0.051 in.) NOTE: If adjusting the gap of a new spark plug, bend only the base the ground electrode. Do not touch the tip. Never attempt to adjust the gap on a used plug. Check the electrode for carbon deposits. Perform a spark test. CAUTION: Absolutely disconnect the each injector connectors. 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 spark occurs while the engine is being cranked. Standard: Spark jumps across electrode gap. Reinstall the spark plug. Reinstall the ignition coil assy. OK: Go to step 8 NG: GO TO NEXT STEP.
6. CHANGE NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Change to the normal spark plug. Perform a spark test. CAUTION: Absolutely 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 spark occurs while the engine is being cranked. Standard: Spark jumps across electrode gap. OK: REPLACE SPARK PLUG NG: GO TO NEXT STEP.
7. CHECK HARNESS AND CONNECTOR OF MISFIRING CYLINDER (IGNITION COIL-ECM) Check the harness and connector between the ignition coil and the ECM (IGF1 terminal) connectors Disconnect the 12, 13, 14, 15, 16 or 17 ignition coil connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ignition coil connector. Reconnect the ECM connector. Check the harness and the connector between the ignition coil and the ECM (IGT terminal) connectors Disconnect the I2, I3, I4, I5, I6 or I7 ignition coil connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ignition coil connector. Reconnect the ECM connector. OK: REPLACE IGNITION COIL ASSY (THEN CONFIRM THAT THERE IS NO MISFIRE) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
8. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 OR #60 VOLTAGE) Turn the ignition switch ON. Measure the voltage between the applicable terminals of the E8 and E9 ECM connectors. Standard: OK: Go to step 11 NG: GO TO NEXT STEP.
9. INSPECT FUEL INJECTOR RESISTANCE OF MISFIRING CYLINDER (See «INSPECTION»(ref-209549-S20929805652005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209549-S23226585272005121000000) )
10. CHECK HARNESS AND CONNECTOR OF MISFIRING CYLINDER (INJECTOR - ECM, INJECTOR - IGNITION SWITCH) Check the harness and the connector between the injector connector and the ECM connector. Disconnect the I8, I9, I10, I11, I12, or I13 injector connector. Disconnect the E8 or E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the injector connector. Reconnect the ECM connector. Check the harness and the connector between the injector connector and the ignition switch connector. Inspect the INJ fuse. Remove the INJ fuse from the instrument panel J/B. Check for continuity in the INJ fuse. Standard: Continuity Reinstall the INJ fuse. Disconnect the I8, I9, I10, I11, I12 or I13 injector connector. Disconnect the I14 ignition switch connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the injector connector. Reconnect the ignition switch connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
11. INSPECT FUEL INJECTOR INJECTION AND VOLUME OF MISFIRING CYLINDER (See «INSPECTION»(ref-209549-S20929805652005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE FUEL INJECTOR ASSY
12. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER (See step 9 under «INSPECTION»(ref-209552-S22544091772005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
13. CHECK VALVE CLEARANCE OF MISFIRING CYLINDER (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) OK: GO TO NEXT STEP. NG: ADJUST VALVE CLEARANCE (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) )
14. SWITCH STEP BY NUMBER OF MISFIRE CYLINDER (REFER TO RESULTS OF STEP 4) HINT: If the result of step 4 is "1 or 2 cylinders", proceed to A. If the result of step 4 is "more than 3 cylinders", proceed to B. A: GO TO NEXT STEP. B: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
15. CHECK VALVE TIMING (CHECK FOR LOOSENESS OR A JUMPED TOOTH OF THE TIMING BELT) (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) OK: GO TO NEXT STEP. NG: ADJUST VALVE TIMING (See «ADJUSTMENT»(ref-209552-S24969545462005121000000) ) (REPAIR OR REPLACE TIMING BELT)
16. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) OK: GO TO NEXT STEP. NG: CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND FILTER
17. READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (INTAKE AIR TEMPERATURE AND MASS AIR FLOW RATE) Connect the hand-held tester or the OBD II scan tool to the DLC3. Turn the ignition switch ON. Check the intake air temperature. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIR" and read its value displayed on the hand-held tester or the OBD II scan tool. Temperature: Equivalent to ambient temperature Check the air flow rate. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAF" and read its value displayed on the hand-held tester or the OBD II scan tool. Standard: OK: GO TO NEXT STEP. NG: REPLACE MASS AIR FLOW SENSOR
18. INSPECT ENGINE COOLANT TEMPERATURE SENSOR (RESISTANCE) Remove the engine coolant temperature sensor. Measure the resistance between the terminals. Resistance: NOTE: In case of checking the engine coolant temperature sensor in the water, be careful not to allow water to go into the terminals. After checking, dry the sensor. HINT: Alternate procedure: Connect an ohmmeter to the installed engine coolant temperature sensor and read the resistance. Use an infrared thermometer to measure the engine temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine temperature (warm up or allow to cool down) and repeat the test. Reinstall the engine coolant temperature sensor. OK: GO TO NEXT STEP. NG: REPLACE ENGINE COOLANT TEMPERATURE SENSOR
19. SWITCH STEP BY NUMBER OF MISFIRE CYLINDER (REFER TO RESULTS OF STEP 4) HINT: If the result of step 4 is "1 or 2 cylinders", proceed to A. If the result of step 4 is "more than 3 cylinders", proceed to B. A: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) B: GO BACK TO STEP 5

The flat type engine knock sensor (non-resonant type) has a structure that can detect vibration in a wide frequency range, from about 6 kHz to 15 kHz.

The sensor, located on the cylinder block, detects spark knock. When "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 341

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

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HINT

1. DTC P0325, P0327 and P0328 are for the bank 1 knock sensor circuit.
2. DTC P0330, P0332 and P0333 are for the bank 2 knock sensor circuit.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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1. READ OUTPUT DTC (CHECK KNOCK SENSOR CIRCUIT) Disconnect the EA1 connector. Using lead wires, connect the EA1 terminals as follows. Warm up the engine. Run the engine at 3,000 RPM for 10 seconds or more. Check the DTC. Result: Reconnect the EA1 connector. A: GO TO NEXT STEP. B: Go to step 4 C: Go to step 5
2. CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - ECM) Disconnect the EA1 connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the EA1 connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT ECM Disconnect the E9 ECM connector. Turn the ignition switch ON. Measure the voltage between the specified ECM terminals. Voltage: Reconnect the ECM connector. OK: CHECK FOR INTERMITTENT PROBLEMS NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NOTE: Fault may be intermittent. Check harness and connectors carefully and retest.
4. CHECK KNOCK SENSOR Check the knock sensor installation. Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) OK: REPLACE KNOCK SENSOR (See «REPLACEMENT»(ref-239231-S35862078662006072700000) ) . NG: TIGHTEN SENSOR
5. INSPECT KNOCK SENSOR Disconnect the EA1 connector. Check the resistance between the terminals of the EA1 male connector. Resistance: Reconnect the EA1 connector. OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG
6. CHECK HARNESS AND CONNECTOR (EA1 CONNECTOR - KNOCK SENSOR) HINT: If DTC P0327, P0328 has changed to P0332, P0333 check the knock sensor circuit on the bank 1 side. If DTC P0332, P0333 has changed to P0327, P0328 check the knock sensor circuit on the bank 2 side. Disconnect the EA1 connector. Disconnect the K2 or K3 knock sensor connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the EA1 connector. Reconnect the knock sensor connector. OK: REPLACE KNOCK SENSOR (See «REPLACEMENT»(ref-239231-S35862078662006072700000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

The NE signal plate (crankshaft position sensor plate) has 34 teeth and is installed on the crankshaft. The NE signal sensor generates 34 signals for each engine revolution. This sensor monitors a plate (timing rotor) located on the crankshaft timing pulley and is used by the ECM to detect crankshaft angle and engine speed (RPM/NE). As the crankshaft timing pulley rotates through an engine revolution, this sensor communicates the rotation of the NE signal plate as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection time and ignition timing.

Scheme 360

Reference: Inspection using the oscilloscope.

The correct waveform is as shown.

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HINT

1. Perform the troubleshooting of DTC P0335 first. If no trouble is found, troubleshoot the engine mechanical systems.
2. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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1. INSPECT CRANKSHAFT POSITION SENSOR (RESISTANCE) Disconnect the C3 crankshaft position sensor connector. Measure the resistance between terminals 1 and 2. Resistance: NOTE: "Cold" and "Hot" shown above mean the temperature the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). Reconnect the crankshaft position sensor connector. OK: GO TO NEXT STEP. NG: REPLACE CRANKSHAFT POSITION SENSOR (See «CRANKSHAFT POSITION SENSOR (3MZ-FE)»(ref-209572-S25326472592005121000000) )
2. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM) Disconnect the C3 crankshaft position sensor connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the crankshaft position sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. CHECK SENSOR INSTALLATION (CRANKSHAFT POSITION SENSOR) OK: GO TO NEXT STEP. NG: TIGHTEN SENSOR
4. CHECK CRANKSHAFT TIMING PULLEY Check the teeth of the crankshaft timing pulley. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPLACE CRANKSHAFT TIMING PULLEY

The variable valve timing (VVT) sensor (VV signal) consists of a magnet, iron core and pickup coil.

The VV signal plate has 3 teeth on its outer circumference and is installed on the camshaft timing pulley. When the camshafts rotate, the protrusion on the signal plate and the air gap on the pickup coil change, causing fluctuations in the magnetic field and generating a voltage in the pickup coil.

This sensor monitors a timing rotor located on the camshaft and is used to detect camshaft angle by the ECM. The camshaft rotation synchronizes with the crankshaft rotation, and this sensor communicates rotation of the camshaft timing rotor as a pulse signal to the ECM. Based on the signal, the ECM controls fuel injection time and ignition timing.

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HINT

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

Reference: Inspection using the oscilloscope.

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

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HINT

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

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1. INSPECT VVT SENSOR (RESISTANCE) Disconnect the V4 or V5 VVT sensor connector. Measure the resistance between the terminals of the VVT sensor. Resistance: NOTE: "Cold" and "Hot" shown above mean the temperature of the coils themselves. "Cold" is from -10°C (14°F) to 50°C (122°F) and "Hot" is from 50°C (122°F) to 100°C (212°F). Reconnect the VVT sensor connector. OK: GO TO NEXT STEP. NG: REPLACE VVT SENSOR (See «VVT SENSOR (3MZ-FE)»(ref-209572-S27564082222005121000000) )
2. CHECK HARNESS AND CONNECTOR (VVT SENSOR - ECM) Disconnect the V4 or V5 VVT sensor connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VVT sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. CHECK SENSOR INSTALLATION (VVT SENSOR) OK: GO TO NEXT STEP. NG: TIGHTEN SENSOR
4. CHECK CAMSHAFT TIMING PULLEY Check the teeth of the camshaft timing pulley. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPLACE CAMSHAFT TIMING PULLEY

HINT

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

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1. CHECK SPARK PLUG AND SPARK OR MISFIRING CYLINDER (See «DTC P0300 RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED, DTC P0301 CYLINDER 1 MISFIRE DETECTED, DTC P0302 CYLINDER 2 MISFIRE DETECTED, DTC P0303 CYLINDER 3 MISFIRE DETECTED, DTC P0304 CYLINDER 4 MISFIRE DETECTED, DTC P0305 CYLINDER 5 MISFIRE DETECTED, DTC P0306 CYLINDER 6 MISFIRE DETECTED»(ref-209540-S26097070262005121000000) ) OK: GO TO NEXT STEP. NG: Go to step 4
2. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM (IGF1 SIGNAL TERMINAL) Disconnect the l2, l3, l4, l5, l6 or l7 ignition coil connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ignition coil connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT ECM (IGF1 VOLTAGE) Disconnect the l2, l3, l4, l5, l6, or l7 ignition coil connect. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Standard: Reconnect the ignition coil connector. OK: REPLACE IGNITION COIL ASSY NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - ECM (IGT SIGNAL TERMINAL) Disconnect the l2, l3, l4, l5, l6 or l7 ignition coil connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ignition coil connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
5. INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE) Measure the voltage between the applicable terminals of the E7 and E8 ECM connectors when the engine is cranked. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
6. INSPECT ECM (IGT1, IGT2, IGT3, IGT4, IGT5 OR IGT6 VOLTAGE) Disconnect the l2, l3, l4, l5, l6 or l7 ignition coil connector. Measure the voltage between the applicable terminals of the E7 and E8 ECM connectors when the engine is cranked. Standard: Reconnect the ignition coil connector. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
7. INSPECT IGNITION COIL ASSY (POWER SOURCE) Disconnect the l2, l3, l4, l5, l6 or l7 ignition coil connect. Turn the ignition switch ON. Measure the voltage between the terminal of the wire harness side connector and the body ground. Standard: Reconnect the ignition coil connector. OK: REPLACE IGNITION COIL ASSY NG: GO TO NEXT STEP.
8. CHECK HARNESS AND CONNECTOR (IGNITION COIL ASSY - IGNITION SWITCH) Inspect the INJ fuse. Remove the INJ fuse from the instrument panel J/R Check for continuity in the INJ fuse. Standard: Continuity Reinstall the INJ fuse. Disconnect the l2, l3, l4, l5, l6 or l7 ignition coil connector. Disconnect the 114 ignition switch connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ignition coil connector. Reconnect the ignition switch connector. OK: REPLACE IGNITION COIL ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT

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

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1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides "P0420 and/or P0430" are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. CHECK FOR EXHAUST GAS LEAKAGE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE EXHAUST GAS LEAKAGE POINT
3. INSPECT AIR FUEL RATIO SENSOR (BANK 1, 2 SENSOR 1) (See «DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-209540-S02903784302005121000000) OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
4. INSPECT HEATED OXYGEN SENSOR (BANK 1, 2 SENSOR 2) (See «DTC P0136 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 1 SENSOR 2), DTC P0156 OXYGEN SENSOR CIRCUIT MALFUNCTION (BANK 2 SENSOR 2)»(ref-209540-S38008601192005121000000) ) OK: REPLACE THREE-WAY CATALYTIC CONVERTER (EXHAUST MANIFOLD LH OR RH) NG: REPLACE HEATED OXYGEN SENSOR

CONFIRMATION READINESS TEST

First Trip Procedure

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1. The vehicle must be cold, and the ambient temperature must be approximately between 50 to 95°F.
2. The Intake Air Temp. (IAT) and the Engine Coolant Temp. (ECT) sensors indicate almost the same value.
3. Clear the DTCs. Disconnect the battery terminal or remove the EFI No. 1 and ETCS fuses for more than 60 sec. Readiness tests will show INCMPL (incomplete).
4. Drive the vehicle on a freeway. Write down the state of the Readiness Tests. They will change to COMPL as the EVAP evaluation monitors operate and if the system passes. This procedure may take approximately 20 minutes or more. NOTE: Do not shut off the engine - the results will be invalid. Pass Condition - No Problem Found by the ECM If the EVAP evaluation monitor shows COMPL, go to the Non-Continuous Test screen. NOTE: Do not shut off the engine - the results will be invalid. To get there, go to Advanced OBD II, On Board Tests, Non-continuous Tests. If all of the tests in the time $02 category show "Pass", the EVAP evaluation monitor has operated and no problem was detected. Fail Condition - Problem Detected by the ECM If the EVAP evaluation monitor shows INCMPL, go to the Not Continuous Test screen. If all Tests show "Pass", the following may have occurred. The EVAP evaluation monitor did not operate. The EVAP evaluation monitor did not finish. The ECM withheld judgement. If one or more of the tests in the time $02 category show "Fail", the EVAP evaluation monitor did operate and the ECM detected a problem. Go to Continuous Tests screen. This is the only place DTC's are listed for the first trip. NOTE: The DTC listed may not be valid. A second trip is need to confirm the DTC. Second Trip Procedure
5. The vehicle must be cold, and the ambient temperature must be approximately between 50 to 95°F.
6. Go to Readiness Tests screen.
7. Drive the vehicle on a freeway. Write down the state of EVAP evaluation monitor. This procedure may take approximately 20 minutes or more. NOTE: Do not shut off the engine - the results will be invalid.
8. If Readiness Tests changes to COMPL, the EVAP evaluation monitor has operated. Check for any stored DTCs. If a DTC has stored, the problem has been detected and confirmed by the ECM. If no DTC was found, the EVAP monitor operate but no problem was detected.

HINT

1. If DTC P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, first troubleshoot DTC P0441, P0446, P0451, P0452 or P0453. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
2. Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tightened it. Also ask the customer whether the fuel tank cap was loose when refueling. If the fuel tank cap was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not sure if it was loose, troubleshoot according to the following procedure.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
4. If the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

HINT

DTC output, malfunction indicates, and repair procedure.

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Hand-held tester

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1. READ OUTPUT DTC Read the output DTC. Troubleshoot each of the problems according to the procedure for each DTC. HINT: If trouble area is known by the DTC, proceed to the applicable part. A: GO TO NEXT STEP. B Go to step 6 C Go to step 10
2. CHECK THAT FUEL TANK CAP IS TOYOTA GENUINE PARTS OK: GO TO NEXT STEP. NG: REPLACE WITH A CAP THAT MEETS OEM SPECIFICATIONS
3. CHECK THAT FUEL TANK CAP IS CORRECTLY INSTALLED OK: GO TO NEXT STEP. NG: CORRECTLY INSTALL FUEL TANK CAP
4. INSPECT FUEL TANK CAP ASSY (See step 2 under «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE FUEL TANK CAP ASSY
5. CHECK FILLER NECK FOR DAMAGE Remove the fuel tank cap. Visually inspect the filler neck for damage. Reinstall the fuel tank cap. OK: GO TO NEXT STEP. NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY (FILLER NECK)
6. PERFORM ACTIVE TEST BY HAND-HELD TESTER (VSV FOR EVAP) Disconnect the vacuum hose of the VSV for EVAP from the charcoal canister. Start the engine. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/EVAP VSV" (press the right or left button). When the VSV for EVAP is operated by the hand-held tester, check if the disconnected hose applies suction to your finger. Standard: Reconnect the vacuum hose. OK Go to step 10 NG: GO TO NEXT STEP.
7. CHECK HOSES AND TUBES (INTAKE MANIFOLD-VSV FOR EVAP, VSV FOR EVAP - CHARCOAL CANISTER) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, or blockage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED HOSE OR TUBE
8. CHECK OPERATION OF VSV FOR EVAP (See step 4 under «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE VSV FOR EVAP (VACUUM SWITCHING VALVE ASSY NO. 1)
9. CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - ECM, VSV FOR EVAP EFI RELAY) Disconnect the V3 VSV for EVAP connector. Turn the ignition switch ON. Measure the voltage between the specified terminal of the V3 VSV for EVAP connector and body ground. Standard: Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/EVAP VSV" (press the right or left button). When the VSV for EVAP is operated by the hand-held tester, measure the voltage between the specified terminals of the V3 VSV for EVAP connector. Standard: Turn the ignition switch OFF. Check the resistance in VSV for EVAP wire harness. Standard: Reconnect the VSV for EVAP connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
10. PERFORM ACTIVE TEST BY HAND-HELD TESTER (VSV FOR CCV) Remove the VSV for CCV. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/CAN CTRL VSV" (press the right or left button). Check the VSV for CCV operation while operating it with the hand-held tester. Standard: Result: A: GO TO NEXT STEP. B: Go to step 13 C: Go to step 15
11. CHECK OPERATION OF VSV FOR CCV (See «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE VSV FOR CCV
12. CHECK HARNESS AND CONNECTOR (VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY) Disconnect the V14 VSV for CCV connector. Turn the ignition switch ON. Measure the voltage between the specified terminal of the V14 VSV for CCV connector and body ground. Standard: Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / CAN CTRL VSV" (press the right or left button). When the VSV for CCV is operated by the hand-held tester, measure the voltage between the specified terminals of the V14 VSV for CCV connector. Standard: Turn the ignition switch OFF. Check the resistance in VSV for CCV wire harness. Standard: Reconnect the VSV for CCV connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
13. CHECK VSV FOR CCV (CHECK FOR LEAKAGE BETWEEN VSV FOR CCV AND CHARCOAL CANISTER) Check that the VSV for CCV is correctly installed. Check the O-ring. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
14. PERFORM ACTIVE TEST BY HAND-HELD TESTER (VSV FOR CCV) Remove the VSV for CCV from the charcoal canister. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/CAN CTRL VSV" (press the right or left button). Check the VSV for CCV operation while operating it with the hand-held tester. Standard: Reinstall the VSV for CCV. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPLACE CHARCOAL CANISTER FILTER NO. 2
15. CHECK FOR EVAPORATIVE EMISSIONS LEAK Check if any hoses close to the fuel tank have been modified, and check if there are signs of any accident damage near the fuel tank or the charcoal canister. Check for cracks, deformation or loose connections of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED COMPONENT
16. CHECK HOSES AND TUBES (INTAKE MANIFOLD - VSV FOR EVAP, VSV FOR EVAP - CHARCOAL CANISTER) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, or blockage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED HOSE OR TUBE
17. CHECK HOSES AND TUBES (FUEL TANK - CHARCOAL CANISTER) Check for proper connection of the fuel tank and the fuel EVAP pipe (See «INSPECTION»(ref-209550-S29292509932005121000000) ), the fuel EVAP pipe and the fuel tube under the floor, the fuel tube and the charcoal canister. Check the hose and the tube for cracks, hole and damage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED HOSE OR TUBE
18. INSPECT CHARCOAL CANISTER ASSY (CRACKS, HOLES OR DAMAGE) (See «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE CHARCOAL CANISTER ASSY
19. INSPECT ECM (VC VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E8 ECM connector. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
20. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E8 ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Standard (1): Using a MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mm Hg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mm Hg, 19.7 in.Hg). Standard (2): Reconnect the vacuum hose. OK: Go to step 22 NG: GO TO NEXT STEP.
21. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the vapor pressure sensor connector. Disconnect the E5 and E8 ECM connectors. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. OK: REPLACE VAPOR PRESSURE SENSOR ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
22. INSPECT FUEL TANK ASSY (CRACKS AND DAMAGE) OK: IT IS LIKELY THAT VEHICLE USER DID NOT PROPERLY CLOSE FUEL TANK CAP NG: REPLACE FUEL TANK ASSY

OBD II scan tool (excluding hand-held tester)

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1. CHECK THAT FUEL TANK CAP IS TOYOTA GENUINE PARTS OK: GO TO NEXT STEP. NG: REPLACE WITH A CAP THAT MEETS OEM SPECIFICATIONS
2. CHECK THAT FUEL TANK CAP IS CORRECTLY INSTALLED OK: GO TO NEXT STEP. NG: CORRECTLY INSTALL FUEL TANK CAP
3. INSPECT FUEL TANK CAP ASSY (See «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE FUEL TANK CAP ASSY
4. CHECK FILLER NECK FOR DAMAGE Remove the fuel tank cap. Visually inspect the filler neck for damage. Reinstall the fuel tank cap. OK: GO TO NEXT STEP. NG: REPLACE FUEL TANK INLET PIPE SUB-ASSY (FILLER NECK)
5. CHECK FOR EVAPORATIVE EMISSIONS LEAK Check if the hoses close to the fuel tank have been modified, and check if there are signs of any accident damage near the fuel tank or the charcoal canister. Check for cracks, deformation or loose connections of the following parts: Fuel tank Charcoal canister Fuel tank filler pipe Hoses and tubes around fuel tank and charcoal canister OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED COMPONENT
6. CHECK HOSES AND TUBES (FUEL TANK - CHARCOAL CANISTER) Check for proper connection of the fuel tank and fuel EVAP pipe (See «ON-VEHICLE INSPECTION»(ref-209550-S12132436072005121000000) ), the fuel EVAP pipe and the fuel tube under the floor, the fuel tube and the charcoal canister. Check the hoses and the tubes for cracks, holes or damage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED HOSE OR TUBE
7. CHECK EACH VSV CONNECTOR FOR LOOSENESS OR DISCONNECTION (VSV FOR EVAP, VSV FOR CCV AND VAPOR PRESSURE SENSOR) OK: GO TO NEXT STEP. NG: REPAIR OR CONNECT VSV AND SENSOR CONNECTORS
8. CHECK HOSES AND TUBES (INTAKE MANIFOLD - VSV FOR EVAP, VSV FOR EVAP - CHARCOAL CANISTER) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses and tubes for cracks, holes, damage, or blockage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE DEFECTIVE OR DAMAGED HOSE OR TUBE
9. INSPECT ECM (VC VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E8 ECM connector. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
10. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E8 ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Standard (1): Using a MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mm Hg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mm Hg, 19.7 in.Hg). Standard (2): Reconnect the vacuum hose. OK: Go to step 12 NG: GO TO NEXT STEP.
11. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the vapor pressure sensor connector. Disconnect the E5 and E8 ECM connectors. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the vapor pressure sensor connector. Reconnect the ECM connector. OK: REPLACE VAPOR PRESSURE SENSOR ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
12. CHECK FUNCTION OF VSV FOR EVAP Turn the ignition switch ON. Check the VSV function. Connect terminal PRG (E8-34) of the ECM connector and the body ground (VSV for EVAP should OPEN, i.e. ON). Standard (1): Air from port E flows out through port F. Disconnect between terminal PRG of the ECM connector and the body ground (VSV for EVAP should CLOSED, i.e. OFF). Standard (2): Air does not flow from port E to port F. OK: Go to step 15 NG: GO TO NEXT STEP.
13. CHECK OPERATION OF VSV FOR EVAP (See «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE VSV FOR EVAP AND CLEAN VACUUM HOSES, AND THEN CHECK CHARCOAL CANISTER
14. CHECK HARNESS AND CONNECTOR (VSV FOR EVAP - ECM, VSV FOR EVAP - EFI RELAY) Check the harness and the connector between the VSV for EVAP connector and the ECM connector. Disconnect the VSV for EVAP connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for EVAP connector. Reconnect the ECM connector. Check the harness and the connector between the VSV for EVAP connector and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the VSV for EVAP connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for EVAP connector. Reinstall the EFI relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
15. CHECK FUNCTION OF VSV FOR CCV Remove the VSV for CCV. Turn the ignition switch ON. Check the VSV function. Connect terminal CCV (E8-27) of the ECM connector and the body ground (VSV for CCV should be CLOSED, i.e. ON). Standard (1): Air does not flow from port E to port F. Disconnect between terminal CCV of the ECM connector and the body ground (VSV for CCV should be OPEN, i.e. OFF). Standard (2): Air from port E flows out through port F. OK: Go to step 18 NG: GO TO NEXT STEP.
16. CHECK OPERATION OF VSV FOR CCV (See «INSPECTION»(ref-209550-S29292509932005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE VSV FOR CCV, AND THEN CHECK LEAKAGE
17. CHECK HARNESS AND CONNECTOR (VSV FOR CCV - ECM, VSV FOR CCV - EFI RELAY) Check the harness and the connector between the VSV for CCV connector and the ECM connector. Disconnect the VSV for CCV connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for CCV connector. Reconnect the ECM connector. Check the harness and the connector between the VSV for CCV connector and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the VSV for CCV connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for CCV connector. Reinstall the EFI relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
18. INSPECT CHARCOAL CANISTER FILTER NO. 2 (CHECK THAT CHARCOAL CANISTER FILTER IS NOT CLOGGED) Turn the ignition switch ON. Check the VSV function. Connect terminal CCV (E8-27) of the ECM connector and the body ground (VSV for CCV should be CLOSED, i.e. ON). Standard (1): Air does not flow from charcoal canister filter port to port F. Disconnect between terminal CCV of the ECM connector and the body ground (VSV for CCV should be OPEN, i.e. OFF). Standard (2): Air from charcoal canister filter port flows out through port F. OK: GO TO NEXT STEP. NG: REPLACE CHARCOAL CANISTER FILTER NO. 2
19. CHECK FUEL TANK OVER FILL CHECK VALVE OK: CHECK AND REPLACE CHARCOAL CANISTER ASSY NG: REPLACE FUEL TANK ASSY

HINT

1. If different DTCs related to different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
2. If DTC P0441 (Purge Flow), P0446 (VSV for CCV), P0451, P0452 or P0453 (Evaporative Pressure Sensor) is output with DTC P0442 or P0456, troubleshoot DTC P0441, P0446, P0451, P0452 or P0453 first. If no malfunction is detected, troubleshoot DTC P0442 or P0456 next.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.
4. When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the vapor pressure sensor.

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1. INSPECT ECM (VC VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E8 ECM connector. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
2. INSPECT ECM (PTNK VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E8 ECM connectors. Disconnect the vacuum hose from the vapor pressure sensor. Standard (1): Using a MITYVAC (Hand-Held Vacuum Pump), apply a vacuum of 4.0 kPa (30 mm Hg, 1.18 in.Hg) to the vapor pressure sensor. NOTE: The vacuum applied to the vapor pressure sensor must be less than 66.7 kPa (500 mm Hg, 19.7 in.Hg). Standard (2): OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
3. CHECK HARNESS AND CONNECTOR (VAPOR PRESSURE SENSOR - ECM) Disconnect the vapor pressure sensor connector. Disconnect the E5 and E8 ECM connectors. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the vapor pressure sensor connector. Reconnect the ECM connectors. OK: GO TO REPLACE VAPOR PRESSURE SENSOR ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

The speed sensor for skid control ECU detects the wheel speed and sends the appropriate signals to the skid control ECU.

The skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via the combination meter.

The ECM determines the vehicle speed based on the frequency of these pulse signals.

Scheme 472

Scheme 473

HINT

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

Scheme 474

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1. CHECK OPERATION OF SPEEDOMETER Drive the vehicle and check if the operation of the speedometer in the combination meter is normal. HINT: The vehicle speed sensor is operating normally if the speedometer display is normal. OK: GO TO NEXT STEP. NG: CHECK SPEEDOMETER CIRCUIT (See «MALFUNCTION IN SPEEDOMETER»(ref-215940-S33246290062006011900000) )
2. INSPECT ECM (SPD VOLTAGE) Shift the lever to the neutral position. Jack up the vehicle. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E6 and E7 ECM connectors as the wheel is turned slowly. Standard: HINT: The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly. OK: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

In addition to turning on the stop lights, the stop lamp switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks. It is important that the switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and ST1-. The ECM analyzes these signal outputs to detect malfunctions in the stop lamp switch.

HINT

Normal condition is as shown in the table.

Scheme 477

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HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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1. CHECK OPERATION OF STOP LIGHT Check if the stop lights go on and off normally when the brake pedal is depressed and released. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE STOP Lamp SWITCH CIRCUIT
2. INSPECT STOP Lamp SWITCH ASSY Check for continuity between each pair of the terminals. Standard: OK: GO TO NEXT STEP. NG: REPLACE STOP Lamp SWITCH ASSY
3. READ VALUE OF HAND-HELD TESTER (STP SIGNAL AND ST1-VOLTAGE) Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STOP LIGHT SW" and read its value displayed on the hand-held tester. Standard: Measure the voltage between the specified terminals of the E6 and E7 ECM connectors. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (STOP Lamp SWITCH - ECM) Disconnect the S13 stop lamp switch connector. Disconnect the E6 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the stop lamp switch connector. Reconnect the ECM connector. OK: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OBD II scan tool (excluding hand-held tester)

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1. CHECK OPERATION OF STOP LIGHT Check if the stop lights go on and off normally when the brake pedal is depressed and released. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE STOP Lamp SWITCH CIRCUIT
2. INSPECT STOP Lamp SWITCH ASSY Check for continuity between each pair of the terminals. Standard: OK: GO TO NEXT STEP. NG: REPLACE STOP Lamp SWITCH ASSY
3. INSPECT ECM (STP AND ST1- VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E6 and E7 ECM connectors. Standard: OK: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (STOP Lamp SWITCH - ECM) Disconnect the S13 stop lamp switch connector. Disconnect the E6 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the stop lamp switch connector. Reconnect the ECM connector. OK: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT

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

Scheme 497

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0505) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides P0505 are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. CHECK CONNECTION OF PCV HOSE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE PCV HOSE
3. CHECK AIR INDUCTION SYSTEM Check for vacuum leaks in air induction system. OK: GO TO CHECK ELECTRIC THROTTLE CONTROL SYSTEM (See «SFI SYSTEM (3MZ-FE)»(ref-239231-S18258544102006072700000) ) NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM

HINT

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

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1. CHECK FUSE (EFI NO. 1 FUSE) Remove the EFI No. 1 fuse from the fusible link block. Check for continuity in the EFI No. 1 fuse. Standard: Continuity Reinstall the EFI No. 1 fuse. OK: GO TO NEXT STEP. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
2. INSPECT ECM (BATT VOLTAGE) Measure the voltage between the specified terminals the E5 and E7 ECM connectors. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
3. CHECK HARNESS AND CONNECTOR (ECM - EFI NO. 1 FUSE, EFI NO. 1 FUSE - BATTERY) Check the harness and the connector between the EFI fuse and the ECM. Remove the EFI No. 1 fuse from the fusible link block. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the EFI No. 1 fuse. Reconnect the ECM connector. Check the harness and the connector between the EFI No. 1 fuse and the battery. Remove the EFI No. 1 fuse from the fusible link block. Disconnect the battery positive terminal. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the EFI No. 1 fuse. Reconnect the battery positive terminal. OK: GO TO CHECK AND REPLACE FUSIBLE LINK BLOCK ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

REPLACE ECM (See REPLACEMENT in ENGINE CONTROL SYSTEM )

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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1. READ VALUE OF HAND-HELD TESTER (STARTER SIGNAL) Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG" and read the value displayed the hand-held tester. Result: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSY (See «DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)»(ref-209546-S30748107882005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSY (See «REPLACEMENT»(ref-209590-S33062210732005121000000) ) (GO TO NEXT STEP 3 AFTER THE REPLACEMENT)
3. READ VALUE OF HAND-HELD TESTER (STARTER SIGNAL) Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG" and read its value displayed the hand-held tester. Result: OK: SYSTEM OK NG: GO TO NEXT STEP.
4. INSPECT IGNITION OR STARTER SWITCH ASSY Check for continuity between the connector terminals (Scheme 510) Standard: OK: GO TO NEXT STEP. NG: REPLACE IGNITION OR STARTER SWITCH ASSY (GO TO NEXT STEP AFTER REPLACEMENT)
5. READ VALUE OF HAND-HELD TESTER (STARTER SIGNAL) Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/STARTER SIG" and read its value displayed the hand-held tester. Result: OK: SYSTEM OK NG: GO TO REPAIR OR REPLACE HARNESS AND CONNECTOR

OBD II scan tool (excluding Hand-held Tester)

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1. INSPECT ECM Turn the ignition switch ON. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
2. INSPECT PARK/NEUTRAL POSITION SWITCH ASSY (See «DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT)»(ref-209546-S30748107882005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE PARK/NEUTRAL POSITION SWITCH ASSY (See «REPLACEMENT»(ref-209590-S33062210732005121000000) ) (GO TO NEXT STEP 3 AFTER THE REPLACEMENT)
3. INSPECT ECM Turn the ignition switch ON. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Standard: OK: SYSTEM OK NG: GO TO NEXT STEP.
4. INSPECT IGNITION OR STARTER SWITCH ASSY Check for continuity between the connector terminals (Scheme 517) Standard: OK: GO TO NEXT STEP. NG: REPLACE IGNITION OR STARTER SWITCH ASSY (GO TO NEXT STEP 5 AFTER THE REPLACEMENT)
5. INSPECT ECM Turn the ignition switch ON. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Standard: OK: SYSTEM OK NG: GO TO REPAIR OR REPLACE HARNESS OR CONNECTOR

The park/neutral position switch comes on when the shift lever is in the N or position. When it comes on, terminal NSW of the ECM is grounded to the body ground via the starter relay, thus the terminal NSW voltage becomes 0 V. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off, so the voltage of terminal NSW becomes battery positive voltage and the voltage of the ECM internal power source.

If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction and for idle speed control (estimated control), etc.

Scheme 520

HINT

After confirming DTC P0705, use the hand-held tester to confirm the PNP switch signal in the "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL".

Refer to INSPECTION PROCEDURE .

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

The ECM receives the operating condition signal (ON/OFF) of the A/C from the A/C ECU, and it also receives the electrical load information from the gateway ECU.

The ECM uses these information to control the engine (idle up, etc.).

Scheme 521

Troubleshoot the Multiplex Communication System (See DIAGNOSTIC TROUBLE CODE CHART ).

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

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

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

If this malfunction is detected, the ECM shuts down the power for the throttle motor, the throttle valve is closed by the return spring, and the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal or the ignition switch is turned OFF.

HINT

This electrical throttle system does not use a throttle cable.

Scheme 522

HINT

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

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1. INSPECT THROTTLE BODY ASSY (RESISTANCE OF THROTTLE CONTROL MOTOR) Disconnect the T2 throttle body connector. Measure the motor resistance between terminals of the throttle control motor. Motor resistance: Reconnect the throttle body connector. OK: GO TO NEXT STEP. NG: REPLACE THROTTLE BODY ASSY
2. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) Disconnect the T2 throttle body connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the throttle body connector. Reconnect the ECM connector. OK: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

The throttle motor is operated by the ECM and it opens and closes the throttle valve using gears. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM to control the throttle motor and set the throttle valve angle in proper response to driver input. If this malfunction is detected, the ECM shuts down the power for the throttle motor, the throttle valve is closed by the return spring, and the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal or the ignition switch is turned OFF.

HINT

This electrical throttle system does not use a throttle cable.

Scheme 529

HINT

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

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1. INSPECT THROTTLE BODY ASSY (VISUALLY CHECK THROTTLE VALVE) Check if a foreign object has been caught between the throttle valve and the housing. OK: GO TO NEXT STEP. NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
2. INSPECT THROTTLE BODY ASSY (RESISTANCE OF THROTTLE CONTROL MOTOR) Disconnect the T2 throttle body connector. Measure the motor resistance between terminals of the throttle control motor. Motor resistance: Reconnect the throttle body connector. OK: GO TO NEXT STEP. NG: REPLACE THROTTLE BODY ASSY
3. CHECK HARNESS AND CONNECTOR (THROTTLE CONTROL MOTOR - ECM) Disconnect the T2 throttle body connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the throttle body connector. Reconnect the ECM connector. OK: GO TO CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

If this malfunction is detected, the ECM shuts down the power for the throttle motor, the throttle valve is closed by the return spring, and the throttle valve is locked at a certain opening angle. Also, the whole electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF.

HINT

This electrical throttle control system (ETCS) does not use a throttle cable.

Scheme 536

HINT

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

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1. CHECK FUSE (ETCS FUSE) Remove the ETCS fuse from the fusible link block. Check for continuity in the ETCS fuse. Standard: Continuity Reinstall the ETCS fuse. OK: GO TO NEXT STEP. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
2. INSPECT ECM (+BM VOLTAGE) Measure the voltage between the specified terminals of 1 E6 and E7 ECM connectors. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
3. CHECK HARNESS AND CONNECTOR (ECM - ETCS FUSE, ETCS FUSE - BATTERY) Check the harness and the connector between the ETCS fuse and the ECM. Remove the ETCS fuse from the fusible link block. Disconnect the E6 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the ETCS fuse. Reconnect the ECM connector. Check the harness and the connector between the ETCS fuse and the battery. Remove the ETCS fuse from the fusible link block. Disconnect the battery positive terminal. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the ETCS fuse. Reconnect the battery positive terminal. OK: GO TO CHECK AND REPLACE FUSIBLE LINK BLOCK ASSY NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

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

If the ECM determines that the ETCS system has a malfunction, it shuts off the power to the throttle motor, the throttle valve is closed by the return spring, and the throttle valve is locked at a small opening angle. At the same time, operation of the ETCS is cancelled until the system returns to normal and the ignition switch is turned off. The ECM will turn on the MIL and a DTC is set.

Scheme 546

HINT

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

Scheme 547

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1. CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P2119) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides P2119 are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. INSPECT THROTTLE BODY ASSY Disconnect the throttle body connector. Measure the motor resistance between terminals of the throttle control motor. Motor resistance: Reconnect the throttle body connector. OK: GO TO NEXT STEP. NG: REPLACE THROTTLE BODY ASSY
3. REPLACE ECM AND CLEAR DTC (CHECK IF DTC OUTPUTS REOCCUR) Replace the ECM. Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Start and warm up the engine. Run the engine at idle for 15 seconds or more. Read the DTC using the hand-held tester or the OBD II scan tool (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Standard: No DTC output. OK: NORMAL NG: GO TO REPLACE THROTTLE BODY ASSY

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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1. READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2) Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ETCS/ACCEL POS #1 and ACCEL POS #2" and read its value displayed on the hand-held tester. Standard: OK: Go to step 5 NG: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the A12 accelerator pedal position sensor connector. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the accelerator pedal position sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT ECM (VCPA AND VCP2 VOLTAGE) Disconnect the A12 accelerator pedal position sensor connector. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 ECM connector. Standard: Reconnect the accelerator pedal position sensor connector. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
4. REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-239231-S24283342762006072700000) in ENGINE CONTROL SYSTEM ) GO TO NEXT STEP.
5. READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Start the engine. Run the engine at idle for 15 seconds or more. Read the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Result: A: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) B: SYSTEM OK

OBD II scan tool (excluding hand-held tester)

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1. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the A12 accelerator pedal position sensor connector. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the accelerator pedal position sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. INSPECT ECM (VCPA AND VCP2 VOLTAGE) Disconnect the A12 accelerator pedal position sensor connector. Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 ECM connector. Standard: Reconnect the accelerator pedal position sensor connector. OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
3. REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-239231-S24283342762006072700000) in ENGINE CONTROL SYSTEM ) GO TO NEXT STEP.
4. READ OUTPUT DTC (ACCELERATOR PEDAL POSITION SENSOR DTCS ARE OUTPUT AGAIN) Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Start the engine. Run the engine at idle for 15 seconds or more. Read the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Result: A: GO TO REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) B: SYSTEM OK

HINT

Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, 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.

Hand-held tester

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Scheme 573

1. READ VALUE OF HAND-HELD TESTER (ACCEL POS #1 AND ACCEL POS #2) Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST/ETCS/ACCEL POS #1 and ACCEL POS #2" and read its value displayed on the hand-held tester. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the A12 accelerator pedal position sensor connector. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the accelerator pedal position sensor connector. Reconnect the ECM connector. OK: GO TO REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-239231-S24283342762006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OBD II scan tool (excluding hand-held tester)

Scheme 574

Scheme 575

Scheme 576

Scheme 577

Scheme 578

Scheme 579

1. INSPECT ECM (VPA AND VPA2 VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 ECM connector. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (ACCELERATOR PEDAL POSITION SENSOR - ECM) Disconnect the A12 accelerator pedal position sensor connector. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the accelerator pedal position sensor connector. Reconnect the ECM connector. OK: REPLACE ACCELERATOR PEDAL ROD ASSY (See «REPLACEMENT»(ref-239231-S24283342762006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing the "A/F CONTROL" ACTIVE TEST (A/F sensor, heated oxygen sensor or other trouble areas can be distinguished).

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

Note. There is a few seconds delay in the A/F sensor output and there is about 20 seconds delay in the heated oxygen sensor output.

Scheme 580

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

For displaying the graph indication, enter "ACTIVE TEST/ A/F CONTROL/USER DATA", then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If DTC P2195 or P2196 is displayed, check bank 1 sensor 1 circuit.
2. If DTC P2197 or P2198 is displayed, check bank 2 sensor 1 circuit.
3. A low A/F sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
4. A high A/F sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
5. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 581

Scheme 582

Scheme 583

Scheme 584

Scheme 585

Scheme 586

Scheme 587

Scheme 588

Scheme 589

Scheme 590

Scheme 591

Scheme 592

Scheme 593

Scheme 594

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO A/F SENSOR DTC) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other codes besides A/F sensor DTC are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER (OUTPUT VOLTAGE OF A/F SENSOR) Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensors (bank 1, 2 sensor 1) by running the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage output on the OBD II scan tool or the hand-held tester. Hand-held tester only: Select the "ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1 or AFS B2 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage output under the following conditions: Allow the engine to idle for 30 seconds. Running the engine at approximately 2,500 RPM (when engine RPM is not suddenly changed). Raise the engine speed to 4,000 RPM and quickly release the accelerator pedal so that the throttle is fully closed. Standard: Condition (1) and (2) Voltage change in the vicinity of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustration. Condition (3) A/F sensor voltage increases to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the Illustration. *: Voltage when using the OBD II scan tool. HINT: Whenever the output voltage of the A/F sensor remains at approximately 3.3 V (0.660 V)* (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F sensor voltage output. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to learn the closed throttle position. When the vehicle is driven: You may notice that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor is functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F sensor or ECM, you will observe a constant voltage. *: Voltage when using the OBD II scan tool. OK: Go to step 13 NG: GO TO NEXT STEP.
3. INSPECT AIR FUEL RATIO SENSOR (RESISTANCE OF A/F SENSOR HEATER) Disconnect the A3 or A4 A/F sensor connector. Measure the resistance between the terminals of the A/F sensor. Resistance: Reconnect the A/F sensor connector. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
4. INSPECT AIR FUEL RATIO SENSOR HEATER RELAY Remove the A/F sensor heater relay from the engine room R/B. Inspect the A/F sensor heater relay. Standard: Reinstall the A/F sensor heater relay. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR HEATER RELAY
5. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) Disconnect the A3 or A4 A/F sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
6. CHECK AIR INDUCTION SYSTEM Check for vacuum leaks in air induction system. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM
7. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) Check fuel pressure (High or low fuel pressure). OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE FUEL SYSTEM
8. INSPECT FUEL INJECTOR ASSY (See «INSPECTION»(ref-209549-S20929805652005121000000) ) Check injector injection (High or low fuel injection quantity or poor injection pattern). OK: GO TO NEXT STEP. NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209549-S23226585272005121000000) )
9. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
10. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO TO NEXT STEP.
11. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000)
12. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
13. PERFORM CONFIRMATION DRIVING PATTERN HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO TO NEXT STEP.
14. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: Go to step 18
15. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
16. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) HINT: Clear all DTCs prior to performing the confirmation driving pattern. GO TO NEXT STEP.
17. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) .
18. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing the "A/F CONTROL" ACTIVE TEST (A/F sensor, heated oxygen sensor or other trouble areas can be distinguished).

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

Note. There is a few seconds delay in the A/F sensor output and there is about 20 seconds delay in the heated oxygen sensor output.

Scheme 595

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

For displaying the graph indication, enter "ACTIVE TEST/ A/F CONTROL/USER DATA", then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. If DTC P2237, P2238, P2239, P2251, P2252 or P2253 is displayed, check the bank 1 sensor 1 circuit.
2. If DTC P2240, P2241, P2242, P2254, P2255 or P2256 is displayed, check the bank 2 sensor 1 circuit.
3. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 596

Scheme 597

Scheme 598

Scheme 599

Scheme 600

Scheme 601

Scheme 602

Scheme 603

Scheme 604

1. INSPECT AIR FUEL RATIO SENSOR (RESISTANCE OF A/F SENSOR HEATER) Disconnect the A3 or A4 A/F sensor connector. Measure the resistance between the terminals of the A/F sensor. Resistance: Reconnect the A/F sensor connector. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
2. INSPECT AIR FUEL RATIO SENSOR HEATER RELAY Remove the A/F sensor heater relay from the engine room R/B. Inspect the A/F sensor heater relay. Standard: Reinstall the A/F sensor heater relay. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR HEATER RELAY
3. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) Disconnect the A3 or A4 A/F sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reconnect the ECM connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

DTC P2A00: A/F SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1), DTC P2A03 A/F SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)

HINT

1. DTC P2A00 means malfunction related to the bank 1 A/F sensor.
2. DTC P2A03 means malfunction related to the bank 2 A/F sensor.

Refer to CIRCUIT DESCRIPTION under DTC P2195.

Scheme 605

HINT

1. Bank 1 refers to the bank that includes cylinder No. 1.
2. Bank 2 refers to the bank that includes cylinder No. 2.
3. Sensor 1 refers to the sensor closest to the engine assembly.

Scheme 606

The air fuel ratio (A/F) sensor has a characteristic that it varies its voltage output in proportion to the air-fuel ratio. Based on the voltage output variation, the ECM judges the air-fuel ratio RICH or LEAN to adjust it close to the stoichiometric air-fuel ratio. The ECM observes variation in the A/F sensor voltage output and compares the compensation. Value of fuel injection volume (Fuel Trim) with it to detect deterioration in response of the A/F sensor itself. Normally, the voltage output of the sensor sharply fluctuates in accordance with rapid variation in the air-fuel ratio. This voltage output variation is represented as locus length. When the response rate has deteriorated, the locus length becomes shorter as the voltage output fluctuation is comparatively slow and small. The ECM concludes that there is a malfunction in the A/F sensor when the locus length is short and the response rate has deteriorated.

Scheme 607

Scheme 608

Scheme 609

Scheme 610

Scheme 611

Refer to PRE-CHECK for detailed information on MODE 06 DATA.

HINT

Hand-held tester only

Narrowing down the trouble area is possible by performing the "A/F CONTROL" ACTIVE TEST (A/F sensor, heated oxygen sensor or other trouble areas can be distinguished).

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

Note. There is a few seconds delay in the A/F sensor output and there is about 20 seconds delay in the heated oxygen sensor output.

Scheme 612

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

For displaying the graph indication, enter "ACTIVE TEST/ A/F CONTROL/USER DATA", then select "AFS B1S1 and O2S B1S2" or "AFS B2S1 and O2S B2S2" by pressing "YES" button and push "ENTER" button before pressing "F4" button.

HINT

1. DTC P2A00 or P2A03 may be also detected, when the air fuel ratio is stuck rich or lean.
2. A low A/F sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.
3. A high A/F sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.
4. Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

Scheme 613

Scheme 614

Scheme 615

Scheme 616

Scheme 617

Scheme 618

Scheme 619

Scheme 620

Scheme 621

Scheme 622

Scheme 623

Scheme 624

Scheme 625

Scheme 626

1. CHECK OTHER DTC OUTPUT (IN ADDITION TO A/F SENSOR DTC) Read the DTC using the hand-held tester or the OBD II scan tool. Result: HINT: If any other code besides P2A00 and/or P2A03 are output, perform the troubleshooting for those DTCs first. A: GO TO NEXT STEP. B: GO TO RELEVANT DTC CHART (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) )
2. READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER (OUTPUT VOLTAGE OF A/F SENSOR) Connect the hand-held tester or the OBD II scan tool to the DLC 3. Warm up the A/F sensors (bank 1, 2 sensor 1) by running the engine at 2,500 RPM for approximately 90 seconds. Read A/F sensor voltage output on the OBD II scan tool or the hand-held tester. Hand-held tester only: Select the "ENHANCED OBD II/SNAPSHOT/MANUAL SNAPSHOT/USER DATA" mode on the hand-held tester. Select "AFS B1 S1 or AFS B2 S1/ENGINE SPD" and press button "YES". Monitor the A/F sensor voltage carefully. Check the A/F sensor voltage output under the following conditions: Allow the engine to idle for 30 seconds. Running the engine at approximately 2,500 RPM (when engine RPM is not suddenly changed). Raise the engine speed to 4,000 RPM and quickly release the accelerator pedal so that the throttle is fully closed. Standard: Condition (1) and (2) Voltage change in the vicinity of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustration. Condition (3) A/F sensor voltage increases to 3.8 V (0.76 V)* or more during engine deceleration (when fuel cut) as shown in the illustration. *: Voltage when using the OBD II scan tool. HINT: Whenever the output voltage of the A/F sensor remains at approximately 3.3 V (0.660 V)* (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have an open-circuit. (This will happen also when the A/F sensor heater has an open-circuit.) Whenever the output voltage of the A/F sensor remains at a certain value of approximately 3.8 V (0.76 V)* or more, or 2.8 V (0.56 V)* or less (see "Malfunction Condition" graphic) under any condition as well as the above conditions, the A/F sensor may have a short-circuit. The ECM will stop fuel injection (fuel cut) during engine deceleration. This will cause a lean condition and should result in a momentary increase in A/F sensor voltage output. The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery terminal has been disconnected, the vehicle must be driven over 10 mph to allow the ECM to learn the closed throttle position. When the vehicle is driven: You may notice that the output voltage of the A/F sensor is below 2.8 V (0.76 V)* during fuel enrichment (for example, when the vehicle tries to overtake another vehicle on a highway, the vehicle speed is suddenly increased with the accelerator pedal fully depressed), the A/F sensor is functioning normally. The A/F sensor is a current output element, and therefore the current is converted into voltage inside the ECM. If measuring voltage at connectors of A/F sensor or ECM, you will observe a constant voltage. *: Voltage when using the OBD II scan tool. OK: Go to step 14 NG: GO TO NEXT STEP.
3. INSPECT AIR FUEL RATIO SENSOR (RESISTANCE OF A/F SENSOR HEATER) Disconnect the A3 or A4 A/F sensor connector. Measure the resistance between the terminals of the A/F sensor. Resistance: Reconnect the A/F sensor connector. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR
4. INSPECT AIR FUEL RATIO SENSOR HEATER RELAY Remove the A/F sensor heater relay from the engine room R/B. Inspect the A/F sensor heater relay. Standard: Reinstall the A/F sensor heater relay. OK: GO TO NEXT STEP. NG: REPLACE AIR FUEL RATIO SENSOR HEATER RELAY
5. CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM) Disconnect the A3 or A4 A/F sensor connector. Disconnect the E9 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the A/F sensor connector. Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
6. CHECK AIR INDUCTION SYSTEM Check for vacuum leaks in air induction system. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE AIR INDUCTION SYSTEM
7. CHECK CONNECTION OF PCV HOSE OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE PCV HOSE
8. CHECK FUEL PRESSURE (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) Check fuel pressure (High or low fuel pressure). OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE FUEL SYSTEM
9. INSPECT FUEL INJECTOR ASSY (See «INSPECTION»(ref-209549-S20929805652005121000000) ) Check injector injection (High or low fuel injection quantity or poor injection pattern). OK: GO TO NEXT STEP. NG: REPLACE FUEL INJECTOR ASSY (See «REPLACEMENT»(ref-209549-S23226585272005121000000) )
10. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
11. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) (See DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)) HINT: Clear all DTCs prior to performing the confirmation driving pattern (See «DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-209540-S02903784302005121000000) ). GO TO NEXT STEP.
12. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) (See DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)
13. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )
14. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) (See DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)) HINT: Clear all DTCs prior to performing the confirmation driving pattern (See «DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-209540-S02903784302005121000000) ). GO TO NEXT STEP.
15. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: Go to step 19
16. REPLACE AIR FUEL RATIO SENSOR GO TO NEXT STEP.
17. PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) (See DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1) HINT: Clear all DTCs prior to performing the confirmation driving pattern (See «DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)»(ref-209540-S02903784302005121000000) . GO TO NEXT STEP.
18. READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN) Read the DTC using the hand-held tester or the OBD II scan tool. Result: A: GO TO NEXT STEP. B: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) AND PERFORM «CONFIRMATION DRIVING PATTERN»(ref-209540-S12913138712005121000000) (See DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1), DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1), DTC P2197 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 2 SENSOR 1), DTC P2198 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 2 SENSOR 1)
19. CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST YES: DTC IS CAUSED BY RUNNING OUT OF FUEL NO: CHECK FOR INTERMITTENT PROBLEMS (See «PRE-CHECK»(ref-209540-S25291281422005121000000) )

The ECM opens and closes the Intake Air Control Valve in response to engine speed (RPM/NE).

This system improves intake manifold tuning for better efficiency at low and high engine RPM.

When the engine speed is 4,000 RPM or less and the throttle valve opening angle is 30° or more, the ECM turns the VSV ON or OFF to operate the intake Air Control Valve.

HINT

ACIS stands for "Acoustic Control Induction System".

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Hand-held tester

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1. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE VSV FOR ACIS) Disconnect the vacuum hose. Connect the hand-held tester to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/INTAKE CTL VSV1" and operate the VSV for AICS. Check the VSV operation when it is operated by the hand-held tester. Standard: Reconnect the vacuum hose. OK: Go to step 4 NG: GO TO NEXT STEP.
2. CHECK VSV FOR ACIS (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. OK: GO TO NEXT STEP. NG: REPLACE VSV FOR ACIS
3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY) Check the wire harness between the VSV for ACIS connector and the ECM connector. Disconnect the V1 VSV for ACIS connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for ACIS connector. Reconnect the ECM connector. Check the wire harness between the VSV for ACIS and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the V1 VSV for ACIS connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the VSV for ACIS connector. Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
4. CHECK VACUUM HOSE (INTAKE MANIFOLD - INTAKE AIR CONTROL VALVE, INTAKE AIR CONTROL VALVE - VSV FOR ACIS) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses for cracks, holes or damage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE VACUUM HOSE
5. INSPECT INTAKE AIR CONTROL VALVE (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPLACE INTAKE AIR CONTROL VALVE

OBD II scan tool (excluding hand-held tester)

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1. INSPECT VSV FOR ACIS (OPERATION) Disconnect the VSV for ACIS connector. Check operation of the VSV for ACIS when battery positive voltage is applied to the terminals of the VSV for ACIS connector. Standard: Battery positive voltage is not applied: Air from port E flows out through the air filter. Battery positive voltage is applied: Air from port E flows out through port F. OK: GO TO NEXT STEP. NG: REPLACE VSV FOR ACIS
2. CHECK ECM (ACIS VOLTAGE) Start the engine. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Standard: OK: Go to step 4 NG: GO TO NEXT STEP.
3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI RELAY) Check the wire harness between the VSV for ACIS connector and the ECM connector. Disconnect the V1 VSV for ACIS connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for ACIS connector. Reconnect the ECM connector. Check the wire harness between the VSV for ACIS and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the V1 VSV for ACIS connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the VSV for ACIS connector. Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
4. CHECK VACUUM HOSE (INTAKE MANIFOLD - INTAKE AIR CONTROL VALVE, INTAKE AIR CONTROL VALVE - VSV FOR ACIS) Check that the vacuum hoses are connected correctly. Check that the vacuum hoses are not loose or disconnected. Check the vacuum hoses for cracks, holes or damage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE VACUUM HOSE
5. INSPECT INTAKE AIR CONTROL VALVE (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPLACE INTAKE AIR CONTROL VALVE

The air cleaner is equipped with two inlets, one of which is opened or closed by the Air Intake Control Valve (AICV). This system reduces intake noise and increases engine power at low to high-speed engine speeds range.

When the engine is operating in the low-to-mid-speed range, this control operates the AICV to close one of the air cleaner inlets. When the engine speed is more than 3,200 RPM and the opening angle of the throttle valve is more than 30°, the ECM activates the VSV and opens the AICV.

Scheme 649

Hand-held Tester

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1. READ VALUE OF HAND-HELD TESTER (VSV FOR AICV) Turn the ignition switch ON and the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/INTAKE CTL VSV1" and operate the VSV for AICV. Check the operation of the VSV when the VSV is operated by the hand-held tester. Standard: OK: Go to step 4 NG: GO TO NEXT STEP.
2. CHECK VSV (FOR AICV) (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE INTAKE AIR CONTROL VALVE ASSY NO. 3
3. CHECK HARNESS AND CONNECTOR (VSV FOR AICV - ECM, VSV FOR AICV - EFI RELAY) Check the wire harness between the VSV for AICV connector and the ECM connector. Disconnect the I1 VSV for AICV connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for AICV connector. Reconnect the ECM connector. Check the wire harness between the VSV for AICV and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the I1 VSV for AICV connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the VSV for AICV connector. Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
4. INSPECT VACUUM TANK (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE

OBDII scan tool (excluding Hand-held Tester)

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1. CHECK VSV (FOR AICV) (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: GO TO NEXT STEP. NG: REPLACE INTAKE AIR CONTROL VALVE ASSY NO. 3
2. INSPECT ECM Turn the ignition switch ON. Measure the voltage between the specified terminals of the E7 and E8 ECM connectors. Voltage: OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT VACUUM TANK (See «INSPECTION»(ref-209551-S23851070422005121000000) ) OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE
4. CHECK AND REPLACE HARNESS AND CONNECTOR (VSV FOR AICV - ECM, VSV FOR AICV - EFI RELAY) Check the wire harness between the VSV for AICV connector and the ECM connector. Disconnect the I1 VSV for AICV connector. Disconnect the E8 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for AICV connector. Reconnect the ECM connector. Check the wire harness between the VSV for AICV and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the I1 VSV for AICV connector. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the VSV for AICV connector. Reinstall the EFI relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR.

Scheme 666

The active control engine mount (ACM) system decreases engine vibration at low engine speed using ACM VSV. The VSV is controlled by a pulse signal transmitted to the VSV from the ECM. In normal operation, the frequency of this pulse signal is matched to engine speed to effectively decreases the engine vibration.

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1. CHECK VACUUM HOSES Check whether the cap of vacuum hose is missing or not. If the hose is damaged, replace the vacuum hose assembly. Check the air and vacuum hoses for looseness, disconnection and blockage. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE VACUUM HOSES
2. CHECK VACUUM Start the engine. Disconnect the vacuum hose from the vacuum tank. Check that an unconnected port located on the vacuum tank applies suction to your finger. Reconnect the vacuum hose. OK: GO TO NEXT STEP. NG: CHECK AND REPLACE VACUUM SOURCE AND HOSES
3. INSPECT ECM Connect the oscilloscope between terminals ACM and of the E7 ECM connector. Warm up engine to normal operating temperature. Turn the A/C switch on. Measure the voltage between terminals ACM and E1 of the E7 ECM connector. Result: OK: Go to step 6 NG: GO TO NEXT STEP.
4. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE) Disconnect the V2 VSV for ACM connector. Measure the resistance between the terminals 1 and 2. Resistance: 19 to 21 ohm at 20°C (68°F) Reconnect the VSV for ACM connector. OK: GO TO NEXT STEP. NG: REPLACE DUTY VACUUM SWITCHING VALVE
5. CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM, VSV FOR ACM - EFI RELAY) Check the wire harness between the VSV for ACM connector and the ECM connector. Disconnect the V2 VSV for ACM connector. Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the VSV for ACM connector. Reconnect the ECM connector. Check the wire harness between the VSV for ACM and the EFI relay. Inspect the EFI No. 2 fuse. Remove the EFI No. 2 fuse from the fusible link block. Check for continuity in the EFI No. 2 fuse. Standard: Continuity Reinstall the EFI No. 2 fuse. Disconnect the V2 VSV for ACM connector Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the VSV for ACM connector. Reinstall the EFI relay. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR.
6. INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION) Remove the VSV for ACM. Check operation of the VSV for ACM when battery positive voltage is applied to the terminals of the VSV for ACM connector. Battery positive voltage is not applied: The air from pipe G is flowing out through pipes E and H. Battery positive voltage is applied: The air from pipe F is flowing out through pipes E and H. Reinstall the VSV for ACM. OK: GO TO NEXT STEP. NG: REPLACE DUTY VACUUM SWITCHING VALVE
7. INSPECT ENGINE MOUNTING INSULATOR ASSY FRONT Disconnect the vacuum hose from the front engine mount insulator. Using MITYVAC (Hand-held Vacuum Pump), apply vacuum of 80 kPa (600 mm Hg, 25 in.Hg) and wait for 1 minute. Check that there is no change in the needle movement of the MITYVAC. Check that there is no fluid leakage caused by a brake of a lower diaphragm. Reconnect the vacuum hose. OK: SYSTEM OK NG: REPLACE ENGINE MOUNTING INSULATOR ASSY FRONT

When the ignition switch is turned ON, battery voltage is applied to terminal IGSW of the ECM. The ECM "MREL" output signal energizes the EFI relay (Marked: EFI).

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

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

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1. INSPECT ECM (+B VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors. Standard: OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000) ) NG: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) Disconnect the E7 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Reconnect the ECM connector. OK: GO TO NEXT STEP. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT ECM (IGSW VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors. Standard: OK: Go to step 6 NG: GO TO NEXT STEP.
4. CHECK FUSE (IGN FUSE) Remove the IGN fuse from the instrument panel J/B. Check for continuity in the IGN fuse. Standard: Continuity Reinstall the IGN fuse. OK: GO TO NEXT STEP. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
5. INSPECT IGNITION OR STARTER SWITCH ASSY Check for continuity between the connector terminals (Scheme 691) Standard: OK: GO TO NEXT STEP. NG: REPLACE IGNITION OR STARTER SWITCH ASSY CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)
6. INSPECT ECM (MREL VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors. Standard: OK: GO TO NEXT STEP. NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )
7. CHECK FUSE (EFI NO. 1 FUSE) Remove the EFI No. 1 fuse from the fusible link block. Check the resistance in the EFI No. 1 fuse. Standard: Below 1 ohm Reinstall the EFI No. 1 fuse. OK: GO TO NEXT STEP. NG: CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED FUSE
8. INSPECT EFI RELAY Remove the EFI relay from the engine room R/B. Inspect the EFI relay. Standard: Reinstall the EFI relay. OK: GO TO NEXT STEP. NG: REPLACE EFI RELAY
9. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) Check the harness and connector between the EFI relay and ECM connector. Remove the EFI relay from the engine room R/B. Disconnect the E5 ECM connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the EFI relay. Reconnect the ECM connector. Check the harness and the connector between the EFI relay and the body ground. Remove the EFI relay from the engine room R/B. Check the resistance between the wire harness side connector and the body ground. Standard (Check for open): Reinstall the EFI relay. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY POSITIVE TERMINAL)

When the engine is cranked, current flows from terminal ST1 of the ignition switch to the starter relay (Marked: ST) coil and also current flows to terminal STA of ECM (STA signal).

When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit opening relay (Marked: 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 Tr ON (circuit opening relay ON) and the fuel pump also keeps operating.

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Hand-held tester

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1. PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE CIRCUIT OPENING RELAY) Connect the hand-held tester to the DLC3. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item "DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/FUEL PUMP/SPD". Check the relay operation while operating it with the hand-held tester. Standard: Operating noise can be heard from the relay. OK: Go to step 5 NG: GO TO NEXT STEP.
2. INSPECT CIRCUIT OPENING RELAY Remove the circuit opening relay from the R/B No. 1 Inspect the circuit opening relay. Standard: Reinstall the circuit opening relay. OK: GO TO NEXT STEP. NG: REPLACE CIRCUIT OPENING RELAY
3. INSPECT ECM (FC VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
4. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH) Check the harness and the connector between the ECM connector and the circuit opening relay. Disconnect the E5 ECM connector. Remove the circuit opening relay from the R/B No. 1. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ECM connector. Reinstall the circuit opening relay. Check the harness and the connector between the circuit opening relay and the 114 ignition switch connector. Inspect the IGN fuse. Remove the IGN fuse from the instrument panel J/B. Check for continuity in the IGN fuse. Standard: Continuity Reinstall the IGN fuse. Remove the circuit opening relay from the R/B No. 1. Disconnect the 114 ignition switch connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the circuit opening relay. Reconnect the ignition switch connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
5. INSPECT FUEL PUMP Inspect the fuel pump resistance. Measure the resistance between terminals 4 and 5. Resistance: 0.2 to 3.0 ohm at 20°C (68°F) Inspect the fuel pump operation Apply battery voltage to both the terminals. Check that the pump operates. NOTE: These tests must be done quickly (within 10 seconds) to prevent the coil from burning out. Keep fuel pump as far away from the battery as possible. Always do the switching at the battery side. OK: GO TO NEXT STEP. NG: REPLACE FUEL PUMP (See «FUEL SUCTION TUBE ASSY W/PUMP & GAGE (3MZ-FE)»(ref-209549-S04087194392005121000000) )
6. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) Check the harness and the connector between the circuit opening relay and the fuel pump connector. Remove the circuit opening relay from the R/B No. 1. Disconnect the F16 fuel pump connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the circuit opening relay. Reconnect the fuel pump connector. Check the harness and the connector between the fuel pump connector and the body ground. Disconnect the F16 fuel pump connector. Check the resistance between the wire harness side connectors and the body ground. Standard (Check for open): Reconnect the fuel pump connector. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR NG: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM )

OBD II scan tool (excluding hand-held tester)

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1. CHECK FUEL PUMP OPERATION (See «ON-VEHICLE INSPECTION»(ref-209549-S28848258462005121000000) ) Check if there is pressure in the fuel inlet hose. HINT: If there is fuel pressure, you will hear the sound of fuel flowing. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (See «PROBLEM SYMPTOMS TABLE»(ref-209540-S38496368092005121000000) ) NG: GO TO NEXT STEP.
2. CHECK RELAY OPERATION (CIRCUIT OPENING RELAY) When connecting between terminal FC of the ECM connector and the body ground, check the relay operation. Standard: Operating noise can be heard from the circuit opening relay. OK: Go to step 6 NG: GO TO NEXT STEP.
3. INSPECT CIRCUIT OPENING RELAY Remove the circuit opening relay from the R/B No. 1. Inspect the circuit opening relay. Standard: Reinstall the circuit opening relay. OK: GO TO NEXT STEP. NG: REPLACE CIRCUIT OPENING RELAY
4. INSPECT ECM (FC VOLTAGE) Turn the ignition switch ON. Measure the voltage between the specified terminals of the E5 and E7 ECM connectors. Standard: OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: GO TO NEXT STEP.
5. CHECK HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY, CIRCUIT OPENING RELAY - IGNITION SWITCH) Check the harness and the connector between the fuel pump connector and the circuit opening relay. Disconnect the E5 ECM connector. Remove the circuit opening relay from the R/B No. 1. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reconnect the ECM connector. Reinstall the circuit opening relay. Check the harness and the connector between the circuit opening relay and the 114 ignition switch connector. Inspect the IGN fuse. Remove the IGN fuse from the instrument panel J/B. Check for continuity in the IGN fuse. Standard: Continuity Reinstall the IGN fuse. Remove the circuit opening relay from the R/B No. 1. Disconnect the 114 ignition switch connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the circuit opening relay. Reconnect the ignition switch connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
6. INSPECT FUEL PUMP Inspect fuel pump resistance. Measure the resistance between terminals 4 and 5. Resistance: 0.2 to 3.0 ohm at 20°C (68°F) Inspect the fuel pump operation Apply battery voltage to both the terminals. Check that the pump operates. NOTE: These tests must be done quickly (within 10 seconds) to prevent the coil from burning out. Keep fuel pump as far away from the battery as possible. Always do the switching at the battery side. OK: GO TO NEXT STEP. NG: REPLACE FUEL PUMP (See «FUEL SUCTION TUBE ASSY W/PUMP & GAGE (3MZ-FE)»(ref-209549-S04087194392005121000000) )
7. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP, FUEL PUMP - BODY GROUND) Check the harness and the connector between the circuit opening relay and the fuel pump connector. Remove the circuit opening relay from the R/B No. 1. Disconnect the F16 fuel pump connector. Check the resistance between the wire harness side connectors. Standard (Check for open): Standard (Check for short): Reinstall the circuit opening relay. Reconnect the fuel pump connector. Check the harness and the connector between the fuel pump connector and the body ground. Disconnect the F16 fuel pump connector. Check the resistance between the wire harness side connectors and body ground. Standard (Check for open): Reconnect the fuel pump connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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

MIL operation is checked visually.

It should be illuminated when the ignition is first turned on. If the MIL is off all of the time or on all of the time, use the procedure below to troubleshoot it. The MIL is used to indicate the ECM's detection of a vehicle malfunction. Follow this procedure using the hand-held tester or an OBD II scan tool to determine the cause of the problem and to check the MIL.

Scheme 739

HINT

Troubleshoot each trouble symptom in accordance with the chart below.

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1. CLEAR DTC Connect the hand-held tester or the OBD II scan tool to the DLC 3. Turn the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON. Read the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Clear the DTC (See «PRE-CHECK»(ref-209540-S25291281422005121000000) ). Check that MIL is not illuminated. Standard: MIL is not illuminated OK: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209540-S35558030242005121000000) ) NG: GO TO NEXT STEP.
2. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Disconnect the E5 ECM connector. Turn the ignition switch ON. Check that MIL is not illuminated. Standard: MIL is not illuminated Reconnect the ECM connector. OK: REPLACE ECM (See «REPLACEMENT»(ref-239231-S14816638622006072700000) in ENGINE CONTROL SYSTEM ) NG: CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)
3. CHECK THAT MIL IS ILLUMINATED Check that the MIL is illuminated when turning the ignition switch ON. Standard: MIL is illuminated OK: SYSTEM OK NG: GO TO NEXT STEP.
4. INSPECT COMBINATION METER ASSY (MIL CIRCUIT) See the combination meter troubleshooting in the «PROBLEM SYMPTOMS TABLE»(ref-215940-S35880634792006011900000) . OK: CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM) NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY