Engine Control System (2GR-FE) (Diagnostic Codes (P1604 - P2610) & Circuit Tests)): Overview Toyota Highlander II рестайлинг

DESCRIPTION

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the Techstream, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. Freeze frame data records engine conditions when a malfunction occurs. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

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1. Reference waveforms showing a normal cold engine start
2. Reference waveforms showing a normal warm engine start
3. Reference values when there is an air leak in the intake system during starting difficulty FREEZE FRAME DATA P1604 STARTABILITY MALFUNCTION Engine Current P1604: Startability Malfunction Time Freeze Frame Data Item Data1 Data2 Data3 Data4 Data5 Unit Engine Speed 1489 986 345 186 124 RPM Calculate Load 36.2 28.2 31.4 92.4 94.6 % Vehicle Load 7.9 7.9 9.2 7.2 6.0 % MAF 10.12 5.04 2.79 0.81 0.68 gm/sec Atmosphere Pressure -0 -0 -0 -0 -0 kPa Coolant Temp 185 185 185 185 185 F Intake Air 102 102 102 102 102 F Battery Voltage 13.222 13.300 12.109 11.972 11.854 V Throttle Sensor Volt % 16.5 16.5 16.0 15.6 15.6 % Throttle Sensor #2 Volt % 48.2 48.2 47.8 47.2 47.2 % Throttle Sensor Position 0.0 0.0 0.0 0.0 0.0 % Throttle Motor DUTY 16.5 16.5 16.0 15.6 15.6 % Injector (Port) 3628 2620 2744 2744 2744 μs Injection Volume (Cylinder 1) 3.062 0.226 0.226 0.226 0.226 ml Fuel Pump/Speed Status ON ON ON ON ON EVAP (Purge) VSV 0.0 0.0 0.0 0.0 0.0 % Evap Purge Flow 0.0 0.0 0.0 0.0 0.0 % Purge Density Learn Value 0.000 0.000 0.000 0.000 0.000 EVAP System Vent Valve OFF OFF OFF OFF OFF EVAP purge VSV OFF OFF OFF OFF OFF Purge Cut VSV Duty 0.0 0.0 0.0 0.0 0.0 % Target Air-Fuel Ratio 0.998 0.998 0.998 0.998 0.998 AF Lambda B1S1 0.999 0.999 0.999 0.999 0.999 AF Lambda B2S1 0.997 0.997 0.997 0.998 0.998 AFS Voltage B1S1 3.258 3.258 3.258 3.258 3.258 V AFS Voltage B2S1 3.251 3.251 3.251 3.253 3.253 V O2S B1S2 0.000 0.000 0.000 0.000 0.000 V O2S B2S2 0.015 0.015 0.015 0.000 0.000 V Short FT #1 0.000 0.000 0.000 0.000 0.000 % Long FT #1 8.782 4.354 -2.665 -2.665 -2.665 % Total FT #1 0.058 0.058 0.058 0.058 0.058 Sort FT #2 0.000 0.000 0.000 0.000 0.000 % Long FT #2 9.264 4.587 -2.462 -2.462 -2.462 % Total FT #2 0.062 0.062 0.062 0.062 0.062 Fuel System Status #1 OL OL OL OL OL Fuel System Status #2 OL OL OL OL OL IGN Advance 0.0 10.5 16.5 18.0 18.0 deg Knock Feedback Value -1.5 -1.5 -1.5 -1.5 -1.5 CA Knock Correct Learn Value 17.0 17.0 17.0 17.0 17.0 CA Starter Signal Close Close Close Close Close Ambient Temp for A/C 70 70 70 70 70 F

MONITOR DESCRIPTION

The ECM continuously monitors its main and sub CPUs for the cruise control. This self-check ensures that the ECM is functioning properly. If outputs from the CPUs are different and deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

The throttle actuator is operated by the ECM and 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. This feedback allows the ECM to appropriately control the throttle actuator and monitor the throttle opening angle as the ECM responds to driver inputs.

HINT

This electronic throttle control system does not use a throttle cable.

The ECM monitors the electrical current through the electronic actuator, and detects malfunctions and open circuits in the throttle actuator based on this value. If the current is outside the standard range, the ECM determines that there is a malfunction in the throttle actuator. In addition, if the throttle valve does not function properly (for example, stuck on), the ECM determines that there is a malfunction. The ECM then illuminates the MIL and sets a DTC.

Example

1. When the electrical current is more than 10 A, or less than 0.5 A and the throttle actuator duty ratio exceeds 80%, the ECM interprets this as the current being outside the standard range, and illuminates the MIL and sets a DTC.
2. If the malfunction is not repaired successfully, a DTC is set when the engine is quickly revved up to a high RPM several times after the engine has idled for 5 seconds after engine start.

The idling speed is controlled by the Electronic Throttle Control System (ETCS).

The ETCS is comprised of a throttle actuator, which operates the throttle valve, and a throttle position sensor, which detects the opening amount of the throttle valve.

The ECM controls the throttle actuator to adjust the throttle valve opening amount so that the idling speed is maintained at the target idling speed.

HINT

1. The ISC learned value is the calculated intake air amount corresponding to the throttle opening amount necessary to maintain the idling speed.
2. This malfunction is only detected once per trip. After it has been detected once, the system will not monitor for the malfunction for the rest of the trip.
3. The system uses the throttle body assembly and mass air flow meter assembly to detect this malfunction.

If there are deposits in the throttle valve, a decrease in the ISC flow rate may cause engine stall an unstable idling. Therefore, the necessary ISC flow rate for idling is maintained using the ISC learned value and feedback. The ECM stores this DTC if the ISC learned value approaches its limit. The ECM begins monitoring for the DTC detection conditions when the following preconditions are met: 1) the manifold absolute pressure sensor is normal; 2) atmospheric pressure is 85 kPa (638 mmHg) or higher; 3) the vehicle has been driven at a speed of 30 km/h (19 mph) or more at least once; and 4) the engine coolant temperature is 45°C (113°F) or less at engine start, the engine is warmed up and conditions for ISC learning are met, or the engine switch has been turned on (IG) (include engine running) for 1 hour or more, the engine is warmed up and conditions for ISC learning are met.

The throttle actuator is operated by the ECM, and opens and closes the throttle valve using the 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 so that it can control the throttle actuator and the throttle valve appropriately in response to driver inputs.

HINT

This electronic throttle control system does not use a throttle cable.

The ECM determines that there is a malfunction in the electronic throttle control system when the throttle valve remains at the fixed angle despite a high drive current from the ECM. The ECM illuminates the MIL and sets a DTC.

If the malfunction is not repaired successfully, a DTC is set when the accelerator pedal is fully depressed and released quickly (to fully open and close the throttle valve) after the engine is next started.

The electronic throttle control system has a dedicated power supply circuit. The voltage (+BM) is monitored and when it is low (less than 4 V), the ECM determines that there is a malfunction in the electronic throttle control system and cuts off the current to the throttle actuator.

When the voltage becomes unstable, the electronic throttle control system itself becomes unstable. For this reason, when the voltage is low, the current to the throttle actuator is cut. If repairs are made and the system returns to normal, turn the ignition switch off. The ECM then allows the current to flow to the throttle actuator so that it can be restarted.

HINT

The electronic throttle control system does not use a throttle cable.

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The ECM monitors the battery supply voltage applied to the throttle actuator.

When the power supply voltage (+BM) drops below 4 V for 0.8 seconds or more, the ECM interprets this as an open in the power supply circuit (+BM). The ECM illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set 5 seconds after the engine is next started.

The electronic throttle control system is composed of the throttle actuator, throttle position sensor, accelerator pedal position sensor, and ECM. The ECM operates the throttle actuator to regulate the throttle valve in response to driver inputs. The throttle position sensor detects the opening angle of the throttle valve, and provides the ECM with feedback so that the throttle valve can be appropriately controlled by the ECM.

The ECM determines the actual opening angle of the throttle valve from the throttle position sensor signal. The actual opening angle is compared to the target opening angle commanded by the ECM. If the difference between these two values is outside the standard range, the ECM interprets this as a malfunction in the electronic throttle control system. The ECM then illuminates the MIL and sets the DTC.

If the malfunction is not repaired successfully, the DTC is set when the accelerator pedal is quickly released (to close the throttle valve) after the engine speed reaches 5000 RPM by the accelerator pedal being fully depressed (fully open the throttle valve).

HINT

This electronic throttle control system does not use a throttle cable.

The accelerator pedal position sensor is integrated with the accelerator pedal bracket and has 2 sensor circuits: VPA1 (main) and VPA2 (sub). This sensor is a non-contact type, and uses Hall-effect elements, in order to yield accurate signals, even in extreme driving conditions, such as at high speeds as well as very low speeds. The voltage, which is applied to terminals VPA1 and VPA2 of the ECM, varies between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A signal from VPA1 indicates the actual accelerator pedal opening angle (throttle valve opening angle) and is used for engine control. A signal from VPA2 conveys the status of the VPA1 circuit and is used to check the accelerator pedal position sensor itself.

The ECM monitors the actual accelerator pedal opening angle (throttle valve opening angle) through the signals from VPA1 and VPA2, and controls the throttle actuator according to these signals.

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HINT

When any of these DTCs are set, check the accelerator pedal position sensor voltage by selecting the following menu items on the Techstream: Select the following menu items: Powertrain / Engine and ECT / Data List / Accel Sensor Out No. 1 and Accel Sensor Out No. 2.

HINT

Accelerator pedal positions are expressed as voltages.

When either of the voltage outputs of VPA1 or VPA2 deviates from the standard range, or the difference between the voltage outputs of the 2 sensor circuits is less than the threshold, the ECM determines that there is a malfunction in the accelerator pedal position sensor. The ECM then illuminates the MIL and sets a DTC.

Example

1. When the voltage output of VPA1 drops below 0.4 V for more than 0.5 seconds when the accelerator pedal is fully depressed, DTC P2122 is set.
2. If the malfunction is not repaired successfully, a DTC is set 2 seconds after the engine is next started.

Refer to DTC P2120, refer to DESCRIPTION.

The accelerator pedal position sensor is mounted on the accelerator pedal bracket. The accelerator pedal position sensor has 2 sensor elements and 2 signal outputs: VPA and VPA2. VPA is used to detect the actual accelerator pedal angle (used for engine control) and VPA2 is used to detect malfunctions in VPA. When the difference between the voltage outputs of VPA and VPA2 deviates from the standard, the ECM determines that the accelerator pedal position sensor is malfunctioning. The ECM turns on the MIL and the DTC is set.

HINT

1. Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.
2. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter and located near the engine assembly.

The air fuel ratio sensor generates a voltage* that corresponds to the actual air fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air fuel ratio. The ECM determines the deviation from the stoichiometric air fuel ratio level, and regulates the fuel injection time. If the air fuel ratio sensor malfunctions, the ECM is unable to control the air fuel ratio accurately.

The air fuel ratio sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor, in order to facilitate accurate oxygen concentration detection. In addition, the sensor and heater portions are narrower than the conventional type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, therefore the sensor activation is accelerated.

A three-way catalytic converter is used in order to convert the carbon monoxide (CO), hydrocarbon, and nitrogen oxides (HOx) into less harmful substances. To allow the three-way catalytic converter to function effectively, it is necessary to keep the air fuel ratio of the engine near the stoichiometric air fuel ratio.

*: Value changes inside the ECM. Since the air fuel ratio sensor is the current output element, a current is converted to a voltage inside the ECM. Any measurements taken at the air fuel ratio sensor or ECM connectors will show a constant voltage.

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HINT

1. DTCs P2195 and P2196 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
2. DTCs P2197 and P2198 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
3. Bank 1 refers to the bank that includes cylinder No. 1.
4. Bank 2 refers to the bank that includes cylinder No. 2.
5. When any of these DTCs are set, check the air fuel ratio sensor voltage output by selecting the following menu items on the Techstream: Powertrain / Engine and ECT / Data List / A/F Control System / AFS Voltage B1 S1 or AFS Voltage B2 S1.
6. Short-term fuel trim values can also be read using the Techstream.
7. The ECM regulates the voltages at the A1A+, A2A+, A1A- and A2A- terminals of the ECM to a constant level. Therefore, the air fuel ratio sensor voltage output cannot be confirmed without using the Techstream.
8. If an air fuel ratio sensor malfunction is detected, the ECM sets a DTC.

Sensor voltage detection monitor

1. Under the air fuel ratio feedback control, if the air fuel ratio sensor voltage output indicates rich or lean for a certain period of time, the ECM determines that there is a malfunction in the air fuel ratio sensor. The ECM illuminates the MIL and sets a DTC.

Example

1. If the air fuel ratio sensor voltage output is less than 2.8 V (very rich condition) for 5 seconds, despite the heated oxygen sensor voltage output being less than 0.6 V, the ECM sets DTC P2196. Alternatively, if the air fuel ratio sensor voltage output is more than 3.8 V (very lean condition) for 5 seconds, despite the heated oxygen sensor voltage output being 0.15 V or more, DTC P2195 is set.

Sensor current detection monitor

1. A rich air fuel mixture causes a low air fuel ratio sensor current, and a lean air fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values.
2. If the air fuel ratio sensor output is 2.2 mA or more for more than 3 seconds of cumulative time, the ECM interprets this as a malfunction in the air fuel ratio sensor and sets DTC P2195 (high-side stuck). If the air fuel ratio sensor output is 0.8 mA or less for more than 3 seconds of cumulative time, the ECM sets DTC P2196 (low-side stuck).

Scheme 397

Refer to DTC P2195, refer to DESCRIPTION.

HINT

1. DTC P2237, P2238, P2239, P2252 and P2253 indicate malfunctions related to the bank 1 air fuel ratio sensor circuit.
2. DTC P2240, P2241, P2242, P2255 and P2256 indicate malfunctions related to the bank 2 air fuel ratio sensor circuit.
3. Bank 1 refers to the bank that includes cylinder No. 1.
4. Bank 2 refers to the bank that includes cylinder No. 2.

The air fuel ratio sensor varies its output voltage in proportion to the air fuel ratio. If the air fuel ratio sensor impedance (alternating current resistance) or voltage output deviates greatly from the standard range, the ECM determines that there is an open or short malfunction in the air fuel ratio sensor circuit.

The circuit description can be found in the EVAP (Evaporative Emission) System, refer to EVAP System.

5 hours *1 after the ignition switch is turned off, the electric vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT

*1: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

*2 : If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

Scheme 398

The vent valve turns ON (closes) and the EVAP (Evaporative Emission) system pressure is then measured by the ECM, using the pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.

Scheme 399

The soak timer operates after the ignition switch is turned off. When a certain amount of time has elapsed after turning the ignition switch off the soak timer activates the ECM to perform malfunction checks which can only be performed after the engine is stopped. The soak timer is built into the ECM.

Scheme 400

1. While the engine is running, the ECM monitors the synchronization of the soak timer and the CPU clock. If these two are not synchronized, the ECM interprets this as a malfunction, illuminates the MIL and stores the DTC.
2. If the soak timer activates the ECM even though only a short amount of time has elapsed since the ignition switch was turned off, or if the soak timer does not activate the ECM even though a considerable amount of time has elapsed since the ignition switch was turned off, the ECM determines that the soak timer is malfunctioning, illuminates the MIL and stores a DTC the next time the ignition switch is turned ON.

LOCATION

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The Active Control Engine Mount (ACM) system decreases engine vibration at engine idling using the ACM VSV. The VSV is controlled by a pulse signal transmitted to the VSV from the ECM. The frequency of this pulse signal is matched to the engine speed to decrease engine vibration.

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1. CHECK VACUUM HOSES If the hose is damaged, replace the vacuum hose assembly. Check the air and vacuum hoses for looseness, disconnection and blockage. TEXT IN ILLUSTRATION *1 Engine *2 VSV *3 Engine Mounting Insulator FR *4 ECM *5 Air Cleaner *6 Vacuum Tank *7 Intake Air Control Valve Actuator NG --> REPAIR OR REPLACE VACUUM HOSES OK: Go to next step
2. CHECK VACUUM TANK Check the vacuum tank, refer to «ON-VEHICLE INSPECTION»(/toyota/highlander/ii-2010-2013/remont/mechanical/#intake-system-2gr-fe-service-information) . NG --> REPLACE AIR CLEANER CAP OK: Go to next step
3. INSPECT ECM Connect the oscilloscope between terminals ACM and E1 of the ECM connectors. Warm up the engine to normal operating temperature. Turn the A/C switch on. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition B48-9 (ACM) - B49-12 (E1) Shift position is D, and engine speed is 850 RPM or less Pulse generation Shift position is D, and engine speed is 950 RPM or more 9 to 14 V Shift position is P 9 to 14 V TEXT IN ILLUSTRATION *a Component with harness connector (ECM) NG --> See step 6 OK: Go to next step
4. INSPECT DUTY VACUUM SWITCHING VALVE (OPERATION) Remove the VSV for ACM. Check operation of the VSV for ACM when positive battery voltage is applied to the terminals of the VSV for ACM connector. Positive battery voltage is not applied The air from pipe G is flowing out through pipes E and H. Positive battery voltage is applied The air from pipe F is flowing out through pipes E and H. Reinstall the VSV for ACM. NG --> See step 9 OK: Go to next step
5. INSPECT ENGINE MOUNTING INSULATOR ASSEMBLY FRONT Disconnect the vacuum hose from the front engine mount insulator. Using a vacuum pump, apply vacuum of 80 kPa (600 mmHg, 25 in.Hg) and wait for 1 minute. Check that there is no change in the needle movement of the vacuum pump gauge. Check that there is no fluid leakage caused by a break in the diaphragm. OK Vacuum pressure exists. Reconnect the vacuum hose. NG --> See step 10 OK --> SYSTEM OK
6. INSPECT DUTY VACUUM SWITCHING VALVE (RESISTANCE) Disconnect the VSV for ACM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 19 to 21 ohms TEXT IN ILLUSTRATION *a Component without harness connected (VSV for ACM Connector) Reconnect the VSV for ACM connector. NG --> See step 9 OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (VSV FOR ACM - ECM) Disconnect the VSV for ACM connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for open Tester Connection Condition Specified Condition B8-2 - B48-9 (ACM) Always Below 1 ohms Tester Connection Condition Specified Condition B8-2 or B48-9 (ACM) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the VSV connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACM - ECM) OK: Go to next step
8. INSPECT FUSE (EFI NO. 3 FUSE) Remove the EFI No. 3 fuse from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition EFI No. 3 fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the EFI No. 3 fuse. NG --> REPLACE FUSE (EFI NO. 3 FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR ACM)
9. REPLACE DUTY VACUUM SWITCHING VALVE. Refer to «COMPONENTS»(ref-422482-S03688356732011092600000)
10. REPLACE ENGINE MOUNTING INSULATOR ASSEMBLY FRONT. Refer to «COMPONENTS»(ref-422482-S39512016942011092600000)

When the ignition switch is turned on (IG), the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a 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 (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D61-22 (+B) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V D61-23 (+B2) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *a Component with harness connected (ECM) NG --> See step 2 OK --> See step 18
2. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Tester Connection Condition Specified Condition B49-12 (E1) - Body ground Always Below 1 ohms Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND) OK: Go to next step
3. INSPECT ECM (MREL VOLTAGE) Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D61-9 (MREL) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *a Component with harness connected (ECM) NG --> See step 8 OK: Go to next step
4. CHECK FUSE (EFI MAIN AND EFI NO. 2 FUSE) Remove the EFI MAIN and EFI No. 2 fuse from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition EFI MAIN fuse Always Below 1 ohms EFI No. 2 fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the fuses. NG --> REPLACE FUSE (EFI MAIN OR EFI NO. 2 FUSE) OK: Go to next step
5. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (EFI RELAY) Inspect the EFI relay, refer to «INSPECTION»(ref-422482-S04976773552011092600000). NG --> See step 19 OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM, EFI RELAY - BODY GROUND) Remove the engine room junction block from the engine room relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for short Tester Connection Condition Specified Condition 2E-9 (EFI relay terminal) - D61-9 (MREL) Always Below 1 ohms 2E-10 (EFI relay terminal) - Body ground Always Below 1 ohms Tester Connection Condition Specified Condition 2E-9 (EFI relay terminal) or D61-9 (MREL) - Body ground Always 10 kohms or higher Reinstall the engine room junction block. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - ECM) OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (EFI RELAY - ECM) Remove the engine room junction block from the engine room relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for short Tester Connection Condition Specified Condition 2E-6 (EFI relay terminal) - D61-22 (+B) Always Below 1 ohms 2E-6 (EFI relay terminal) - D61-23 (+B2) Always Below 1 ohms Tester Connection Condition Specified Condition 2E-6 (EFI relay terminal) or D61-22 (+B) - Body ground Always 10 kohms or higher 2E-6 (EFI relay terminal) or D61-23 (+B2) - Body ground Always 10 kohms or higher Reinstall the engine room junction block assembly. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - ECM) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI RELAY - EFI MAIN FUSE)
8. INSPECT ECM (IGSW VOLTAGE) Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D60-21 (IGSW) - B49-12 (E1) Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *a Component with harness connected (ECM) NG --> See step 9 OK --> See step 20
9. CHECK HARNESS AND CONNECTOR (ECM - IG2 RELAY) Remove the IG2 relay from the engine room relay block. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition IG2 relay terminal 3 - D60-21 (IGSW) Always Below 1 ohms Reconnect the ECM connector. Reinstall the IG2 relay. NG --> See step 13 OK: Go to next step
10. INSPECT IG2 RELAY Remove the IG2 relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When no battery voltage applied to terminals 1 and 2 10 kohms or higher When battery voltage applied to terminals 1 and 2 Below 1 ohms Reinstall the IG2 relay. NG --> REPLACE IG2 RELAY OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (IG2 RELAY POWER SOURCE) Remove the IG2 relay from the engine room relay block. Turn the ignition switch on (IG) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition 5 - Body ground Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 IG2 Relay Reinstall the IG2 relay. NG --> See step 14 OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND) Remove the IG2 relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 2 - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 IG2 Relay Reinstall the IG2 relay. Result Result Proceed to NG A OK (w/o Smart Key System) B OK (w/ Smart Key System) C B --> See step 15 C --> See step 17 A --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND)
13. CHECK FUSE (IG2 FUSE) Remove the IG2 fuse from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition IG2 fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the IG2 fuse NG --> REPLACE FUSE (IG2 FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BATTERY)
14. CHECK FUSE (IGN FUSE) Remove the IGN fuse from the instrument panel junction block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition IGN fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Instrument Panel Junction Block Reinstall the IGN fuse. NG --> REPLACE FUSE (IGN FUSE) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - ECM)
15. CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - IG2 RELAY) Remove the IG2 relay from the engine room relay block. Disconnect the ignition switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for short Tester Connection Condition Specified Condition D24-6 (IG2) - IG2 relay terminal 1 Always Below 1 ohms Tester Connection Condition Specified Condition D24-6 (IG2) or IG2 relay terminal 1 - Body ground Always 10 kohms or higher Reinstall the IG2 relay. Reconnect the ignition switch connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - IG2 RELAY) OK: Go to next step
16. INSPECT IGNITION SWITCH Inspect the ignition switch assembly, refer to «INSPECTION»(ref-422480-S10091741892011092600000). NG --> See step 21 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY)
17. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - MAIN BODY ECU) Remove the IG2 relay from the engine room relay block. Remove the instrument panel junction block (main body ECU). Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Condition Specified Condition IG2 relay holder terminal (1) - D7-11 (IG2D) Always Below 1 ohms IG2 relay holder terminal (2) - Body ground Always Below 1 ohms Standard resistance (Check for short) Tester Connection Condition Specified Condition D7-11 (IG2D) - Body ground Always 10 kohms or higher Reinstall the IG2 relay. Reconnect the main body ECU connector. NG --> See step 22 OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
18. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422300-S30744331712011092600000)
19. REPLACE ENGINE ROOM JUNCTION BLOCK. Refer to «COMPONENTS»(ref-422482-S36016698302011092600000)
20. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)
21. REPLACE IGNITION SWITCH. Refer to «COMPONENTS»(ref-422480-S37759550762011092600000)
22. CHECK SMART KEY SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422490-S09330679052011092600000)

The ECM constantly uses 5 V from the battery voltages supplied to the +B (BATT) terminal to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.

When the VC circuit is short-circuited, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are inactivated because the power is not supplied from the VC circuit. Under this condition, the system does not start up and the MIL does not illuminate even if the system malfunctions.

HINT

Under normal conditions, the MIL is illuminated for several seconds when the ignition switch is first turned to the on (IG). The MIL goes off when the engine is started.

Scheme 420

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Scheme 422

The FUEL PUMP relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the starter-operating signal (STA) and crankshaft-rotating signal (NE).

The FUEL PUMP relay is turned ON while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed.

The FUEL PUMP relay is turned OFF while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.

Scheme 423

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Scheme 430

1. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY) Connect the Techstream to the DLC3. Turn the ignition switch on (IG), and turn the tester on. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed. Check the relay operation while operating it using the tester. Standard Operating noise can be heard from the relay. NG --> See step 13 OK: Go to next step
2. INSPECT TERMINAL VOLTAGE (FUEL PMP RELAY TERMINAL) Remove the FUEL PMP relay from the engine room relay block. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition FUEL PMP relay terminal 2 - Body ground Ignition switch on (IG) 9 to 14 V FUEL PMP relay terminal 3 - Body ground Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 FUEL PMP Reinstall the FUEL PMP relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PMP RELAY - C/OPN RELAY) OK: Go to next step
3. INSPECT RELAY (FUEL PMP RELAY) Remove the FUEL PMP relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 4 When no battery voltage is applied terminals 1 and 2 Below 1 ohms 3 - 5 When no battery voltage is applied terminals 1 and 2 10 kohms or higher 3 - 4 When battery voltage is applied terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage is applied terminals 1 and 2 Below 1 ohms Reinstall the FUEL PMP relay. NG --> REPLACE RELAY (FUEL PMP RELAY) OK: Go to next step
4. INSPECT FUEL PUMP RESISTOR Disconnect the fuel pump resistor connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 1 - 2 20°C (68°F) 0.30 to 0.34 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Fuel Pump Resistor) Reconnect the fuel pump resistor connector. NG --> See step 14 OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PMP RELAY) Check the wire harness between the FUEL PMP relay and fuel pump. Remove the fuel pump relay from the engine room relay block. Disconnect the fuel pump connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition FUEL PMP relay terminal 4 - O9-4 Always Below 1 ohms FUEL PMP relay terminal 4 or O9-4 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR) Disconnect the fuel pump resistor connector. Remove the fuel pump relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Condition Specified Condition FUEL PMP relay terminal (5) - A35-1 Always Below 1 ohms Standard resistance (Check for short) Tester Connection Condition Specified Condition FUEL PMP relay terminal (5) or A35-1 - Body ground Always 10 kohms or higher Reconnect the fuel pump resistor connector. Reinstall the fuel pump relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (FUEL PUMP RESISTOR - FUEL PUMP) Disconnect the fuel pump resistor connector. Disconnect the fuel pump connector. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Condition Specified Condition A35-2 - O9-4 Always Below 1 ohms Standard resistance (Check for short) Tester Connection Condition Specified Condition A35-2 or O9-4 - Body ground Always 10 kohms or higher Reconnect the fuel pump resistor connector. Reconnect the fuel pump connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
8. INSPECT FUEL PUMP Inspect the fuel pump. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connections Condition Specified Condition 4 - 5 20°C (68°F) 0.2 to 0.3 ohms TEXT IN ILLUSTRATION *a Component without harness connected (Fuel Pump) Apply battery voltage to both terminals 4(+) and 5(-). Check that the pump operates. NOTE: These tests must be done quickly (within 10 seconds) to prevent the coil from burning out. Keep the fuel pump as far away from the battery as possible. Always turn ON and OFF the voltage on the battery side, not on the fuel pump side. NG --> See step 15 OK --> CHECK AND REPLACE FUEL FILTER
9. CHECK ECM POWER SOURCE CIRCUIT HINT: Refer to «ECM Power Source Circuit»(ref-422478-S01252786672011092600000). NG --> REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT OK: Go to next step
10. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY (C/OPN RELAY) Inspect the C/OPN relay, refer to «INSPECTION»(ref-422482-S04976773552011092600000). NG --> See step 16 OK: Go to next step
11. INSPECT ECM (FC VOLTAGE) Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition D61-3 (FC) - B49-12 (E1) Ignition switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Component with harness connected (ECM) NG --> See step 12 OK --> See step 17
12. CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY) Disconnect the ECM connector. Remove the engine room junction block. Measure the resistance according to the value(s) in the table below. Standard resistance (Check for open) Tester Connection Condition Specified Condition D61-3 (FC) - 2D-12 (C/OPN relay terminal) Always Below 1 ohms Standard resistance (Check for short) Tester Connection Condition Specified Condition D61-3 (FC) or 2D-12 (C/OPN relay terminal) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reinstall the engine room junction block. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - C/OPN RELAY) OK --> See step 18
13. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422300-S30744331712011092600000)
14. REPLACE FUEL PUMP RESISTOR. Refer to «COMPONENTS»(ref-422481-S41326341462011092600000)
15. REPLACE FUEL PUMP ASSEMBLY. Refer to «COMPONENTS»(ref-422481-S30563121812011092600000)
16. REPLACE CIRCUIT OPENING RELAY. Refer to «COMPONENTS»(ref-422482-S36016698302011092600000)
17. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)
18. REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY. Refer to «COMPONENTS»(ref-422482-S36016698302011092600000)

The fuel injectors are located on the intake manifold. They inject fuel into the cylinders based on the signals from the ECM.

Scheme 431

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Scheme 434

1. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE) Disconnect the fuel injector assembly connector. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition B13-2 - Body ground Ignition switch on (IG) 11 to 14 V B14-2 - Body ground Ignition switch on (IG) 11 to 14 V B15-2 - Body ground Ignition switch on (IG) 11 to 14 V B16-2 - Body ground Ignition switch on (IG) 11 to 14 V B17-2 - Body ground Ignition switch on (IG) 11 to 14 V B18-2 - Body ground Ignition switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Fuel Injector) Turn the ignition switch off. Reconnect the fuel injector assembly connector. NG --> See step 4 OK: Go to next step
2. INSPECT FUEL INJECTOR ASSEMBLY Inspect the injector assembly, refer to «INSPECTION»(ref-422481-S02899962322011092600000). NG --> See step 5 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (FIEL INJECTOR ASSEMBLY - ECM) Disconnect the fuel injector connector (of the misfiring cylinder). Measure the voltage according to the value(s) in the table below. Standard voltage Cylinder Tester Connection Switch Condition Specified Condition No. 1 B13-1 - Body ground Ignition switch on (IG) 11 to 14 V No. 2 B14-1 - Body ground Ignition switch on (IG) 11 to 14 V No. 3 B15-1 - Body ground Ignition switch on (IG) 11 to 14 V No. 4 B16-1 - Body ground Ignition switch on (IG) 11 to 14 V No. 5 B17-1 - Body ground Ignition switch on (IG) 11 to 14 V No. 6 B18-1 - Body ground Ignition switch on (IG) 11 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Fuel Injector) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM) OK --> See step 6
4. INSPECT FUSE (INJ NO. 2 FUSE) Remove the INJ No. 2 fuse from engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition INJ No. 2 fuse Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the INJ No. 2 fuse. NG --> REPLACE FUSE OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY (IG2 RELAY) - FUEL INJECTOR ASSEMBLY)
5. REPLACE FUEL INJECTOR ASSEMBLY. Refer to «COMPONENTS»(ref-422481-S19451899152011092600000)
6. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)

While the engine is being cranked, current flows from terminal ST1 of the ignition switch to the park/neutral position switch (for automatic transaxle) or clutch pedal switch (for manual transaxle) and also flows to terminal STA of the ECM (STA Signal).

Scheme 435

The system detects the ignition switch's starting signal (STSW) and then supplies current to the starter until the ECM judges that the engine has started successfully. The purpose is to reduce the holding time of the ignition key.

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1. CHECK CRANKING When starting the engine, check whether the starter motor starts. OK Engine is cranking. NG --> See step 2 OK --> See step 16
2. READ VALUE USING TECHSTREAM (STA SIGNAL) Connect the Techstream to the DLC3. Turn the ignition switch on (IG). Turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Data List / Starter Signal. Check the result when the ignition switch is turned on (IG) and when the engine is started. OK Display (Starter Signal) Condition OFF Ignition switch on (IG) ON Engine start NG --> See step 10 OK: Go to next step
3. INSPECT ST RELAY Remove the ST relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When no battery voltage applied terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage applied terminals 1 and 2 Below 1 ohms Reinstall the ST relay. NG --> REPLACE ST RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY) Disconnect the park/neutral position switch connector. Remove the ST relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance (check for open) Tester Connection Condition Specified Condition B5-5 - ST relay terminal (2) Always Below 1 ohms Standard resistance (check for short) Tester Connection Condition Specified Condition B5-5 or ST relay terminal (2) - Body ground Always 10 kohms or higher Reconnect the park/neutral position switch connector. Reinstall the ST relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (PARK/NEUTRAL POSITION SWITCH - ST RELAY) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (ST RELAY - BODY GROUND) Remove the ST relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition ST relay terminal (1) - Body ground Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 ST Relay Reinstall the ST relay to the engine room relay block. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - BODY GROUND) OK: Go to next step
6. INSPECT TERMINAL VOLTAGE (ST RELAY TERMINAL) Remove the ST relay from the engine room relay block. Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition ST relay terminal (5) - Body ground Always 9 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 ST Relay Reinstall the ST relay to the engine room relay block. NG --> See step 9 OK: Go to next step
7. INSPECT STARTER ASSEMBLY Inspect the starter assembly, refer to «INSPECTION»(ref-422480-S14962512622011092600000). NG --> See step 17 OK: Go to next step
8. CHECK HARNESS AND CONNECTOR (ST RELAY - STARTER ASSEMBLY) Remove the ST relay from the engine room relay block. Disconnect the starter connector. Measure the resistance according to the value(s) in the table below. Standard resistance (check for open) Tester Connection Condition Specified Condition ST relay terminal (3) - B12-1 Always Below 1 ohms Standard resistance (check for short) Tester Connection Condition Specified Condition ST relay terminal (3) or B12-1 - Body ground Always 10 kohms or higher Reconnect the starter connector. Reinstall the ST relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ST RELAY - STARTER ASSEMBLY) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER ASSEMBLY)
9. INSPECT FUSIBLE LINK (ST FUSE) Remove the fusible link from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition Fusible link Always Below 1 ohms TEXT IN ILLUSTRATION *1 Engine Room Relay Block Reinstall the fusible link. NG --> REPLACE FUSIBLE LINK OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER RELAY)
10. CHECK ECM (STAR AND STSW VOLTAGE) Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Condition Specified Condition B49-31 (STAR) - Body ground Always 9 to 14 V D60-30 (STSW) - Body ground Always 9 to 14 V TEXT IN ILLUSTRATION *a Component with harness connected (ECM) Result Terminal STAR Terminal STSW Proceed to 9 to 14 V 9 to 14 V A 0 V 9 to 14 V B 0 V 0 V C B --> See step 18 C --> See step 15 A: Go to next step
11. INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY Inspect the park/neutral position switch. Disconnect the park/neutral position switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance Shift Position Tester Connection Specified Condition P 2 - 6, 4 - 5 Below 1 ohms R 1 - 2 Below 1 ohms N 2 - 9, 4 - 5 Below 1 ohms D 2 - 7 Below 1 ohms 2 2 - 3 Below 1 ohms L 2 - 8 Below 1 ohms TEXT IN ILLUSTRATION *a Component with harness connected (Park/Neutral Position Switch) RESULT: Result Proceed To OK A NG (with U151E) B NG (with U151F) C Reconnect the park/neutral position switch connector. B --> See step 19 C --> See step 21 A: Go to next step
12. CHECK HARNESS AND CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH) Disconnect the ECM connector. Disconnect the park/neutral position switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance (check for open) Tester Connection Condition Specified Condition D60-10 (STA) - B5-5 Always Below 1 ohms Standard resistance (check for short) Tester Connection Condition Specified Condition D60-10 (STA) or B5-5 - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the park/neutral position switch connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - PARK/NEUTRAL POSITION SWITCH) OK: Go to next step
13. INSPECT RELAY (ST CUT RELAY) Remove the ST CUT relay from the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection Condition Specified Condition 3 - 5 When no battery voltage applied terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage applied terminals 1 and 2 Below 1 ohms Reinstall the ST CUT relay. NG --> REPLACE RELAY OK: Go to next step
14. INSPECT TERMINAL VOLTAGE (ST CUT RELAY TERMINAL) Remove the ST CUT relay from the engine room relay block. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition 2 - Body ground Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *1 Engine Room Relay Block *2 ST CUT Relay Reinstall the ST CUT relay. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - IG2 RELAY) OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ST CUT RELAY - BODY GROUND)
15. CHECK HARNESS AND CONNECTOR (ECM - MAIN BODY ECU) Disconnect the ECM connector. Disconnect the main body ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance (check for open) Tester Connection Condition Specified Condition D60-30 (STSW) - D10-4 (STSW) Always Below 1 ohms Standard resistance (check for short) Tester Connection Condition Specified Condition D60-30 (STSW) or D10-4 (STSW) - Body ground Always 10 kohms or higher Reconnect the ECM connector. Reconnect the main body ECU connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - MAIN BODY ECU) OK --> See step 20
16. CHECK FOR INTERMITTENT PROBLEMS. Refer to «CHECK FOR INTERMITTENT PROBLEMS»(ref-422300-S41051796092011092600000)
17. REPLACE STARTER ASSEMBLY. Refer to «COMPONENTS»(ref-422480-S19657349892011092600000)
18. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)
19. REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY. Refer to «COMPONENTS»(ref-422434-S02352304072011092600000)
20. CHECK SMART KEY SYSTEM. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-422490-S09330679052011092600000)
21. REPLACE PARK/NEUTRAL POSITION SWITCH. Refer to «COMPONENTS»(ref-422435-S06194260542011092600000)

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

When the engine speed is between 0 and 4450 RPM and the throttle valve opening angle is 60° or more, the ECM supplies current to the VSV (ON status), to close the IACV. Under other conditions, the VSV is usually OFF and the IACV is open.

Scheme 442

Scheme 443

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Scheme 445

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVE THE VSV FOR INTAKE CONTROL) Connect the Techstream to the DLC3. Start the engine and turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Active Test / Active the VSV for Intake Control. Check the operation of the VSV when the intake air control is operated by the tester. OK Operational noise can be heard. NG --> See step 2 OK --> See step 5
2. CHECK INTAKE AIR CONTROL VALVE (OPERATION) Disconnect the intake air control valve connector. Apply battery voltage between the terminals of the air intake valve connector. TEXT IN ILLUSTRATION *a Component without harness connected (Intake Air Control Valve) Check the air intake valve operation. OK Operational noise can be heard. Reconnect the intake air control valve connector. NG --> See step 6 OK: Go to next step
3. INSPECT TERMINAL VOLTAGE (INTAKE AIR CONTROL VALVE CONNECTOR) Disconnect the intake air control valve connection. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition 2 - Body ground Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to Intake Air Control Valve) Reconnect the intake air control valve connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 - INTAKE AIR CONTROL VALVE) OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (INTAKE AIR CONTROL VALVE - ECM) Disconnect the intake air control valve connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for short Tester Connection Condition Specified Condition B28-1 - B49-19 (ACIS) Always Below 1 ohms Tester Connection Condition Specified Condition B28-1 or B49-19 (ACIS) - Body ground Always 10 kohms or higher Reconnect the intake air control valve connector. Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR ACIS - ECM) OK --> See step 7
5. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to «PROBLEM SYMPTOMS TABLE»(ref-422300-S30744331712011092600000)
6. REPLACE INTAKE AIR SURGE TANK. Refer to «COMPONENTS»(/toyota/highlander/ii-2010-2013/remont/mechanical/#intake-system-2gr-fe-service-information)
7. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)

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 engine speed 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 3600 RPM and the opening angle of the throttle valve is more than 60°, the ECM activates the VSV and opens the AICV.

Scheme 446

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Scheme 449

1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR AICS) Disconnect the 2 hoses from the VSV for air intake control valve. Turn the ignition switch on (IG) and turn the tester on. Select the following menu items: Powertrain / Engine and ECT / Active Test / Activate the VSV for AICS. Check the operation of the VSV when the VSV is operated by the tester. Standard Tester Operation Specified Condition VSV is ON Air from port E flows out through port F VSV is OFF Air from port E flows out through the air filter TEXT IN ILLUSTRATION *1 VSV is ON *2 VSV is OFF *3 Air *4 Port F *5 Port E NG --> See step 3 OK: Go to next step
2. INSPECT VACUUM TANK Inspect the vacuum tank, refer to «ON-VEHICLE INSPECTION»(/toyota/highlander/ii-2010-2013/remont/mechanical/#intake-system-2gr-fe-service-information) . NG --> REPAIR OR REPLACE AIR CLEANER CAP OK --> See step 6
3. CHECK VSV (FOR AICV) Inspect the VSV for AICV, refer to «INSPECTION»(/toyota/highlander/ii-2010-2013/remont/mechanical/#intake-system-2gr-fe-service-information) . NG --> See step 7 OK: Go to next step
4. INSPECT TERMINAL VOLTAGE (VSV FOR AIR INTAKE CONTROL VALVE CONNECTOR) Disconnect the VSV for air intake control valve connector. Turn the ignition switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage Tester Connection Switch Condition Specified Condition 1 - Body ground Ignition switch on (IG) 9 to 14 V TEXT IN ILLUSTRATION *a Front view of wire harness connector (to VSV for Air Intake Control Valve) NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI NO. 3 FUSE - VSV FOR AIR INTAKE CONTROL VALVE) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (VSV FOR AIR INTAKE CONTROL VALVE - ECM) Disconnect the VSV for air intake control valve connector. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance Check for open Check for short Tester Connection Condition Specified Condition A10-2 (VSV for AICV) - B49-20 (AICV) Always Below 1 ohms Tester Connection Condition Specified Condition A10-2 (VSV for AICV) or B49-20 (AICV) - Body ground Always 10 kohms or higher Reconnect the ECM connector. NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (VSV FOR AICV - ECM) OK --> See step 8
6. CHECK ECM POWER SOURCE CIRCUIT. Refer to «ECM Power Source Circuit»(ref-422478-S01252786672011092600000)
7. REPLACE VSV (FOR AICV). Refer to «COMPONENTS»(/toyota/highlander/ii-2010-2013/remont/mechanical/#intake-system-2gr-fe-service-information)
8. REPLACE ECM. Refer to «COMPONENTS»(ref-422482-S29849271832011092600000)

When the vehicle is being driven with the accelerator pedal depressed, depressing the brake pedal without releasing the accelerator pedal will activate the brake override system to restrict driving torque. The conditions for activating the brake override system as well as the items that are controlled are explained below.

Scheme 450

Activation Conditions

1. Vehicle is running at or above the specified speed.
2. The accelerator pedal is depressed beyond a specified level, and then the brake pedal is depressed.

Note. The vehicle may not enter the brake override system control due to the relation of the accelerator pedal angle and the vehicle's speed.

Items Controlled

1. Driving torque is restricted.

HINT

During brake override system control, the value for the accelerator pedal angle (which is used for engine control) is forcibly reduced to a specified value. For this reason, the Data List value for Accelerator Position (applied to electronic throttle control) will be replaced with a specified value regardless of the actual accelerator pedal angle (Accel Sens. No. 1 Volt %, Accel Sens. No. 2 Volt %)

Deactivation Conditions

1. When the Stop Light Switch turns OFF or the actual accelerator pedal angle increases or decreases beyond the specified range.

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually. When the ignition switch is first turned on (IG), the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the Techstream.

Scheme 451

Scheme 452

See also:
• ON-VEHICLE INSPECTION - Step 2
• ON-VEHICLE INSPECTION
• ON-VEHICLE INSPECTION - Step 9
• INSPECTION
• ON-VEHICLE INSPECTION
• ON-VEHICLE INSPECTION