2GR-FE Engine Starting System: Overview Toyota Avalon XX30 рестайлинг

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DESCRIPTION

This DTC is output when the IG output circuits inside the power source control ECU are open or short.

DTC DETECTION CONDITION CHART

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1. CHECK DTC OUTPUT Delete the DTC (See «DTC CHECK / CLEAR»(ref-291119-S36678531102008072400000) ). HINT: After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG). Check for DTCs again. OK: No DTC is output. NG: Go to step 2 OK: END
2. INSPECT FUSE (AM2) Remove the AM2 fuse from the engine room J/B. Measure the resistance of the fuse. Resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step
3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY) Disconnect the D44 ECU connector. Measure the voltage according to the value(s) in the table below. Voltage TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-33 (AM1) - Body ground 10 to 14 V D44-12 (AM2) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE POWER SOURCE CONTROL ECU

This DTC is output when the IG output circuit from the inside the power source control ECU to the IG1 relay is malfunctioning.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Select the items below in the Data List, and read the displays on the tester. Power Source Control: DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG1 Relay Monitor (Outside) Status of IG1 relay monitor (outer) / ON or OFF ON: Engine switch ON (IG1 relay is ON) OFF: Engine switch OFF (IG1 relay is OFF) - OK: "OK" (engine switch on (IG)) appears on the screen. Result RESULT CHART Condition Proceed to NG C OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC chart) A B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 2 A : REPLACE POWER SOURCE CONTROL ECU
2. INSPECT RELAY (Marking: IG1) Remove the IG1 relay from the instrument panel J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE RELAY OK: Go to next step
3. CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - POWER SOURCE CONTROL ECU) Disconnect the II J/B connector. Disconnect the D44 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition II-9 - D44-34 (IG1D) Below 1 ohms D44-34 (IG1D) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - BATTERY AND BODY GROUND) Disconnect the IF and IA J/B connectors. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. Condition Specified value IF-10 - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Voltage TERMINAL SPECIFIED CONDITION CHART Terminal No. Condition Specified value IA-1 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
5. INSPECT INSTRUMENT PANEL J/B Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. Condition Specified value IF-10 - IG1 relay terminal-1 Always Below 1 ohms II-9 - IG1 relay terminal-2 Always Below 1 ohms NG: REPLACE INSTRUMENT PANEL J/B OK : REPLACE POWER SOURCE CONTROL ECU

This DTC is output when the IG output circuit from the inside of the power source control ECU to the IG2 relay is malfunctioning.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Read the Data List according to the displays on the tester. Power Source Control: DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note IG2 Relay Monitor (Outside) Status of IG2 relay monitor (outer) / ON or OFF ON: Engine switch ON (IG2 relay is ON) OFF: Engine switch OFF (IG2 relay is OFF) - OK: "ON" (Engine switch on (IG)) appears on the screen. Result RESULT CHART Condition Proceed to NG C OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC chart) A B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 2 A : REPLACE POWER SOURCE CONTROL ECU
2. INSPECT RELAY (Marking: IG2) Remove the IG2 relay from the engine room R/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE RELAY OK: Go to next step
3. CHECK WIRE HARNESS (ENGINE ROOM R/B - POWER SOURCE CONTROL ECU AND BODY GROUND) Remove the IG2 relay from the engine room J/B and R/ B. Disconnect the D44 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition Engine Room R/B IG2 relay terminal 1 - D44-35 (IG2D) Below 1 ohms Engine Room R/B IG2 relay terminal 2 - Body ground Below 1 ohms D44-35 (IG2D) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE POWER SOURCE CONTROL ECU

This DTC is output when the ACC output circuit from the inside the power source control ECU to the ACC relay is malfunctioning.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Read the Data List according to the displays on the tester. Power Source Control: DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note ACC Relay Monitor Status of ACC Relay Monitor / ON or OFF ON: Engine switch ON (ACC) OFF: Engine switch OFF - OK: "ON" (engine switch on (ACC)) appears on the screen. Result RESULT CHART Condition Proceed to NG C OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC chart) A B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 2 A : REPLACE POWER SOURCE CONTROL ECU
2. INSPECT RELAY (Marking: ACC) Remove the ACC relay for the instrument panel J/B. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3 - 5 10 kohms or higher 3 - 5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE RELAY OK: Go to next step
3. CHECK WIRE HARNESS (ACC RELAY - POWER SOURCE CONTROL ECU AND BODY GROUND) Disconnect the D44 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition J/B ACC relay terminal 2 - D44-11 (ACCD) Below 1 ohms J/B ACC relay terminal 2 - Body ground 10 kohms or higher J/B ACC relay terminal 1 - Body ground Below 1 ohms. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE POWER SOURCE CONTROL ECU

This DTC is output when the ST output circuits inside the power source control ECU is open or shorted.

DTC DETECTION CONDITION CHART

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1. CHECK DTC OUTPUT Delete the DTC (See «DTC CHECK / CLEAR»(ref-291119-S36678531102008072400000) ). HINT: After all DTCs are cleared, turn the engine switch on (IG) and depress the brake pedal. After 15 seconds have elapsed, check if the trouble occurs again. Check for DTCs again. OK: No DTC is output. NG: Go to step 2 OK: END
2. INSPECT POWER SOURCE CONTROL ECU Measure the voltage according to the value(s) in the table below. Voltage TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Condition Specified condition D44-39 (STSW) - Body ground Brake pedal depressed, Engine switch START 10 to 14 V HINT: Voltage is output for 0.3 seconds after engine start. NG: REPLACE POWER SOURCE CONTROL ECU OK: Go to next step
3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) Disconnect the D44 ECU connector. Disconnect the A55 ECM connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-39 (STSW) - A55-14 (STSW) Below 1 ohms D44-39 (STSW) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK POWER SOURCE CONTROL ECU OPERATION After replacing the power source control ECU with a normally functioning ECU, check that the engine can start. OK: Engine can start normally. NG: GO TO «SFI SYSTEM»(/toyota/avalon/xx30-2007-2010/remont/engine-control-systems/#engine-control-system-2gr-fe) OK : END (POWER SOURCE CONTROL ECU DEFECTIVE)

The power source control ECU and the ECM are connected by the cable and BEAN.

If the cable information and BEAN information are inconsistent, this DTC will be output.

DTC DETECTION CONDITION CHART

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1. CHECK DTC OUTPUT Delete the DTC (See «DTC CHECK / CLEAR»(ref-291119-S36678531102008072400000) ). HINT: After all DTCs are cleared, check if the trouble occurs again 50 seconds after the engine switch is turned on (IG). Check for DTCs again. OK: No DTC is output. NG: Go to step 2 OK: END
2. INSPECT POWER SOURCE CONTROL ECU Measure the voltage according to the value(s) in the table below. Voltage DTC DETECTION CONDITION CHART Terminal No. (Symbol) Condition Specified condition D44-31 (CTSW) - Body ground Brake pedal depressed, Ignition switch START Below 1 V HINT: Voltage is output only when the engine is cranking. NG: Go to step 4 OK: Go to next step
3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) Disconnect the D44 ECU connector. Disconnect the A55 ECM connector. Measure the resistance according to the value(s) in the table below. Resistance DTC DETECTION CONDITION CHART Terminal No. (Symbol) Specified condition D44-31 (CTSW) - A55-13 (ACCR) Below 1 ohms D44-31 (CTSW) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK POWER SOURCE CONTROL ECU OPERATION After replacing the power source control ECU with a normally functioning ECU, check that the engine starts. OK: Engine can start normally. NG: GO TO «SFI SYSTEM»(/toyota/avalon/xx30-2007-2010/remont/engine-control-systems/#engine-control-system-2gr-fe) OK : END (POWER SOURCE CONTROL ECU DEFECTIVE)

This DTC is output when the submersion circuit monitor inside the power source control ECU detects that the vehicle is submerged in water.

DTC DETECTION CONDITION CHART

This DTC is output when: 1) a malfunction is detected between the power source control ECU and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Read the Data List according to the displays on the tester. Power source control DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Start Switch 1 Status of start switch 1 / ON or OFF ON: Engine switch ON (IG) OFF: Engine switch OFF (IG) - Start Swtich2 Status of start switch 2 / ON or OFF ON: Engine switch ON (IG) OFF: Engine switch OFF (IG) - OK: "ON" (engine switch on (IG)) appears on the screen Result RESULT CHART Condition Proceed to NG C OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC chart) A B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 2 A : REPLACE POWER SOURCE CONTROL ECU
2. INSPECT ENGINE SWITCH Disconnect the D21 switch connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Switch Condition Specified value D21-2 (SS2) - D21-5 (GND) Free 10 kohms or higher Pushed (Hold) Below 1 ohms D21-7 (SS1) - D21-5 (GND) Free 10 kohms or higher Pushed (Hold) Below 1 ohms NG: REPLACE ENGINE SWITCH OK: Go to next step
3. CHECK WIRE HARNESS (ENGINE SWITCH - POWER SOURCE CONTROL ECU AND BODY GROUND) Disconnect the D44 ECU connector. Disconnect the D21 Switch connector. Measure the resistance of the wire harness side connectors. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D21-7 (SS1) - D44-14 (SSW1) Below 1 ohms D21-2 (SS2) - D44-37 (SSW2) Below 1 ohms D21-5 (GND) - Body ground Below 1 ohms D21-7 (SS1) or D44-14 (SSW1) - Body ground 10 kohms or higher D21-2 (SS2) or D44-37 (SSW2) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE ENGINE SWITCH

The power source control ECU and the shift lock control ECU are connected by a cable and the BEAN. If the cable information and BEAN information are inconsistent, this DTC will be output.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Read the DATA LIST according to the displays on the tester. Power Source Control: DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Shift P Signal Shift P Signal / ON or OFF ON: Shift P signal ON (Shift position is P) OFF: Shift P signal OFF (Shift position is not P) - OK: "ON" (P signal is ON) appears on the screen. Result RESULT CHART Condition Proceed to NG C OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE) B OK (When troubleshooting according to the DTC chart) A B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE C: Go to step 2 A : REPLACE POWER SOURCE CONTROL ECU
2. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - SHIFT LOCK CONTROL ECU) Disconnect the D44 ECU connector. Disconnect the D25 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-5 (P) - D25-11 (P2) Below 1 ohms D44-5 (P) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK POWER SOURCE CONTROL ECU OPERATION After replacing the power source control ECU with a normally functioning ECU, check that the push button start function can start normally. OK: Push button start function can start normally. NG: GO TO SHIFT CONTROL SYSTEM OK : END (POWER SOURCE CONTROL ECU DEFECTIVE)

The skid control ECU converts these signals into 4-pulse signals and sends them to the combination meter. After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted to the power source control ECU. The power source control ECU determines vehicle speed based on the frequency of these pulse signals.

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The power source control ECU and the combination meter are connected by a cable and BEAN. This DTC is output when: 1) the cable information and BEAN information are inconsistent; and 2) a malfunction is detected between the vehicle speed sensor and the combination meter.

DTC DETECTION CONDITION CHART

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HINT

1. A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The signal is changed to a pulse signal at the transistor in the combination meter. Each ECU controls the respective system based on the pulse signal.
2. If a short occurs in an ECU, all systems in the diagram below will not operate normally.

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1. CHECK SPEEDOMETER OPERATION Drive the vehicle and check if the function of the speedometer in the combination meter is normal. OK: Actual vehicle speed and the speed indicated on the speedometer are the same. HINT: The vehicle speed sensor is functioning normally when the indication on the speedometer is normal. NG: CHECK COMBINATION METER ASSEMBLY OK: Go to next step
2. CHECK DTC OUTPUT (PUSH BUTTON START) Delete the DTC (See «DTC CHECK / CLEAR»(ref-291119-S36678531102008072400000) ). HINT: After all DTCs are cleared, check if the trouble occurs again 320 seconds after the engine switch is turned on (IG). Check for DTCs again. OK: No DTC is output OK: END NG: Go to next step
3. CHECK DTC OUTPUT (ABS SYSTEM) Delete the DTC (w/o VSC: See «DTC CHECK / CLEAR»(ref-291130-S18671479352008072400000), w / VSC: See «DTC CHECK/CLEAR»(ref-291130-S27702785922008072400000) ). HINT: If the DTCs for the ABS system or the vehicle speed sensor malfunction are output, inspect those DTCs first (w/o VSC: See «DIAGNOSTIC TROUBLE CODE CHART»(ref-291130-S12363120642008072400000), w/VSC: See «DIAGNOSTIC TROUBLE CODE CHART»(ref-291130-S38165042482008072400000) ). Check for DTCs again. OK: No DTC is output NG: GO TO «ANTI-LOCK BRAKE SYSTEM»(ref-291130-S20138950262008072400000). OK: Go to next step
4. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch on (IG) and press Techstream main switch on. Read the Data List according to the displays on the tester. Main Body DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Vehicle Speed Signal Status of vehicle speed signal / STOP or RUN STOP: Vehicle is stopped RUN: Vehicle is running - OK: "STOP" (vehicle is stopped) appears on the screen. NG: Go to step 5 OK : REPLACE POWER SOURCE CONTROL ECU
5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - COMBINATION METER ASSEMBLY) Disconnect the D44 ECU connector. Disconnect the E2 meter connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-19 (SPD) - E2-15 Below 1 ohms D44-19 (SPD) - Body ground 10 kohms or higher HINT: If the resistance between terminal SPD and body ground is less than 10 kohms, there may be a short in a wire harness, connector, or ECU. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR AND EACH ECU OK: Go to next step
6. CHECK DTC OUTPUT (POWER SOURCE CONTROL ECU ASSEMBLY) After replacing the power source control ECU with a normally functioning ECU, check for power source control ECU DTCs. OK: Power source control ECU DTCs are not output. NG: GO TO «COMBINATION METER SYSTEM»(ref-291102-S42787779762008072400000) OK: END (POWER SOURCE CONTROL ECU DEFECTIVE)

This DTC is output when :1) the brake signal circuit between the power source control ECU and the stop light switch is malfunctioning; and 2) the cable and BEAN information are inconsistent.

DTC DETECTION CONDITION CHART

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The power source control ECU and the steering lock ECU are connected by a cable and LIN. These DTCs are output when: 1) the cable information and LIN information are inconsistent; and 2) a malfunction is detected between the power source control ECU and the steering lock ECU.

DTC DETECTION CONDITION CHART

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1. PERFORM ACTIVE TEST BY TECHSTREAM Connect Techstream to the DLC3. Turn the power switch on (IG) and press Techstream main switch on. Preform the Active Test according to the displays on the tester. Power Source Control ECU: DIAGNOSTIC NOTE CHART Tester Display Test Part Control Range Diagnostic Note P Supply for Steering Lock Power supply for steering lock ON / OFF - OK: When ON is selected, power is supplied to the steering lock ECU. NG: Go to step 2 OK: Go to «STEERING LOCK FUNCTION»(ref-291118-S00634229422008072400000)
2. CHECK DTC OUTPUT Delete the DTC (See «DTC CHECK / CLEAR»(ref-291119-S36678531102008072400000) ). HINT: After all DTCs are cleared, check if the trouble occurs again 5 seconds after the engine switch is turned on (IG). Check for DTCs again. OK: No DTC is output. OK: END NG: Go to next step
3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ACTUATOR ASSEMBLY) Disconnect the D44 ECU connector. Disconnect the D14 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-26 (SLP) - D14-4 (SLP1) Below 1 ohms D44-26 (SLP) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK POWER SOURCE CONTROL ECU After replacing the power source control ECU with a normally functioning ECU, check that the steering lock unlocks. OK: Steering lock unlocks. NG: GO TO «STEERING LOCK FUNCTION»(ref-291118-S00634229422008072400000) OK: END (POWER SOURCE CONTROL ECU DEFECTIVE)

The power source control ECU and the ECM are connected by the cable and BEAN. If the cable information and BEAN information are inconsistent, this DTC will be output.

DTC DETECTION CONDITION CHART

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1. READ VALUE OF TECHSTREAM Connect Techstream to the DLC3. Turn the engine switch ON (IG) and press Techstream main switch on. Read the Data List according to the displays on the tester. Power Source Control ECU: DIAGNOSTIC NOTE CHART Tester Display Measurement Item/Range Normal Condition Diagnostic Note Engine Condition Engine condition / RUN or STOP RUN: Engine switch is ON (START) STOP: Engine switch is OFF, ON (IG) or ON (ACC) - OK: "RUN" (engine switch is on (START)) appears on the screen. "STOP" (engine switch is off, on (IG) or on (ACC)) appears on the screen. NG: Go to step 2 OK: Go to «SFI SYSTEM»(/toyota/avalon/xx30-2007-2010/remont/engine-control-systems/#engine-control-system-2gr-fe)
2. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM) Disconnect the D44 ECU connector. Disconnect the A55 ECM connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D44-2 (TACH) - A55-15 (TACH) Below 1 ohms D44-2 (TACH) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
3. CHECK DTC OUTPUT After replacing the power source control ECU with a normally functioning ECU, check for power source control ECU DTCs. OK: Power source control ECU DTCs are not output. NG: GO TO «SFI SYSTEM»(/toyota/avalon/xx30-2007-2010/remont/engine-control-systems/#engine-control-system-2gr-fe) OK : END (POWER SOURCE CONTROL ECU DEFECTIVE)

These DTCs are output when :1) any other DTC is set in the power source control ECU: or 2) the wire harness between the power source control ECU and the certification ECU is open or short.

DTC DETECTION CONDITION CHART

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1. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - CERTIFICATION ECU) Disconnect the D44 ECU connector. Disconnect the D39 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TERMINAL SPECIFIED CONDITION CHART Terminal No. (Symbol) Specified Condition D44-30 (LIN1) - D39-10 (LIN) Below 1 ohms D44-30 (LIN1) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
2. CHECK POWER SOURCE CONTROL ECU OPERATION After replacing power source control ECU with a normally functioning ECU, check that the engine starts. OK: Engine can start normally. Result RESULT CHART Condition Proceed to OK A NG (When troubleshooting according to the DTC B2287) B NG (When troubleshooting according to the DTC B2289) C B: REPLACE CERTIFICATION ECU C: Go to «SMART KEY SYSTEM»(ref-291119-S00930757912008072400000) (MATCHING FOR THE INSIDE OF THE CABIN CANNOT BE PERFORMED). A: END (POWER SOURCE CONTROL ECU DEFECTIVE)

Engine start conditions or system malfunctions can be checked by the status of the engine switch indicator light.

Engine switch indicator light condition

ENGINE SWITCH INDICATOR LIGHT CONDITION CHART

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1. INSPECT ENGINE SWITCH Disconnect the D21 switch connector. Connect the positive (+) lead to terminal "A" and the negative (-) lead to terminal "B" of the engine switch. Check if the illumination for the engine switch comes on. OK ILLUMINATION CONDITION CHART Positive {+) Connection (Symbols) Negative (-) Connection (Symbols) Illumination Condition D21-11 (SWIL) D21-4 (COM) or D21-5 (GND) Comes on D21-12 (INDS) D21-4 (COM) or D21-5 (GND) Comes on D21-13 (INDW) D21-4 (COM) or D21-5 (GND) Comes on NG: REPLACE ENGINE SWITCH OK: Go to next step
2. CHECK WIRE HARNESS (ENGINE SWITCH - POWER SOURCE CONTROL ECU AND BODY GROUND) Disconnect the D44 ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection (Symbols) Condition Specified condition D44-4 (INDS) - D21-12 (INDS) Always Below 1 ohms D44-13 (INDW) - D21-13 (INDW) Always Below 1 ohms D44-36 (SWIL) - D21-11 (SWIL) Always Below 1 ohms D44-4 (INDS) - Body ground Always 1 Mohms or Higher D44-13 (INDW) - Body ground Always 1 Mohms or Higher D44-36 (SWIL) - Body ground Always 1 Mohms or Higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK : REPLACE POWER SOURCE CONTROL ECU

1. Engine Start System Operation If the brake pedal depressed and the engine switch is pressed with the shift lever in the P or N position, the power source control ECU determines it as an engine start request. The certification ECU and other ECUs perform key verification via the LIN communication line. The power source control ECU activates the ACC relay. The power source control ECU activates the IG1, IG2, and ST CUT relays. The engine switch indicator light lights up in green. The certification ECU outputs a steering UNLOCK signal. The signal is sent to the steering lock ECU via the power source control ECU. The power source control ECU sends an engine start request signal to the ECM. The ECM and power source control ECU activate the ST relay. The ECM sends an ACC relay cut signal to the power source control ECU. The power source control ECU deactivates the ACC relay until the ECU detects engine start. When engine revolution speed reaches 800 rpm, the power source control ECU determines that the engine has been started. The ECU reactivates the ACC relay and turns off the engine switch indicator light. SYMBOLS OF POWER SOURCE CONTROL ECU Symbols of power source control ECU Signals STP Stop light switch ON signal SSW1 / SSW2 Engine switch ON signal ACCD ACC relay operation signal IG2D IG2 relay operation signal STR2 ST relay operation signal STR1 Park / neutral position switch signal TACH Engine start detection signal STSW Starter activation request signal CTSW ACC relay cut signal

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See also:
• PROBLEM SYMPTOMS TABLE
• PRECAUTION
• REMOVAL