Smart Key System (Keyless Start) (Diagnostic Codes & Symptom Tests): Overview Toyota Corolla X рестайлинг

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1. CHECK POWER SOURCE MODE CHANGE FUNCTION Check the function of the engine switch. Check that power source mode changes in accordance with the conditions of the shift position and brake pedal. Brake Pedal Shift Lever Power Source Mode Pattern Depressed P or N When the engine switch is pushed once. off --> engine start on (ACC) --> engine start on (IG) --> engine start Not depressed P Each time the engine switch is pushed. off --> on (ACC) --> on (IG) --> off Except P Each time the engine switch is pushed. off --> on (ACC) --> on (IG) --> on (ACC) - P When the engine switch is pushed with power source mode on (IG) (engine running). on (IG) --> off - Except P When the engine switch is pushed with power source mode on (IG) (engine running). on (IG) --> on (ACC) Check if power source mode changes without pressing the engine switch. With power source mode on (ACC) and the shift position in P, wait for at least 1 hour. Check that power source mode changes from on (ACC) to off automatically.
2. CHECK INDICATOR CONDITION Check the indicator on the engine switch. Check that the engine switch indicator turns on and changes color according to the table below. Power Source Mode/Condition Indicator Light Condition Brake pedal released Brake pedal depressed, shift lever in P or N off OFF ON (Green) (When key and vehicle IDs match) on (ACC, IG) ON (Amber) ON (Green) Engine running OFF OFF Steering lock not unlocked Flashes (Green) for 15 sec. Flashes (Green) for 15 sec. System malfunction Flashes (Amber) for 15 sec. Flashes (Amber) for 15 sec.

DESCRIPTION

This DTC is output when a problem such as an open in the AM2 NO. 2 fuse, an open or short in the wire harness between the fuse and main body ECU (instrument panel junction block), a short in the IG output circuit inside the main body ECU (instrument panel junction block), a short between the main body ECU (instrument panel junction block) and relay, and a short in the relay is detected.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). 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 DTC is not output. NG --> See step 2 OK --> See step 3
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - BATTERY) Disconnect the E50 and E51 ECU connectors. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E51-1 (AM1) - Body ground Always 11 to 14 V E50-6 (AM2) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR, OR FUSE OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
3. USE SYMPTOM METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)

This DTC is output when there is a problem in the IG1D output circuit, which is from the inside of the main body ECU (instrument panel junction block) to the IG1 relay.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Select the item below in the Data List, and read the display on the Techstream. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY 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 (IG) (IG1 relay is ON) OFF: Engine switch off (IG1 relay is OFF) - OK "ON" (engine switch on (IG)) appears on the screen. NG --> See step 3 OK: Go to next step
2. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Turn the engine switch on (IG). After 10 seconds have elapsed, check if the trouble occurs again. OK DTC B2272 is not output. NG --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OK --> See step 6
3. INSPECT RELAY (IG1 RELAY) Remove the IG1 relay 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 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE IG1 RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU) Disconnect the 2F junction block connector. Disconnect the E51 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2F-3 - E51-6 (IG1D) Always Below 1 ohms E51-6 (IG1D) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY AND BODY GROUND) Disconnect the 2E and 2G junction block connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2E-17 - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2G-1 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY AND BODY GROUND) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
6. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)

This DTC is output when there is a problem in the IG2D output circuit, which is from the inside of the main body ECU (instrument panel junction block) to the IG2 relay.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Read the Data List according to the displays on the Techstream. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY 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 (IG) (IG2 relay is ON) OFF: Engine switch off (IG2 relay is OFF) - OK "ON" (Engine switch on (IG)) appears on the screen. NG --> See step 3 OK: Go to next step
2. CHECK FRO DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Turn the engine switch on (IG). After 10 seconds have elapsed, check if the trouble occurs again. OK DTC B2273 is not output. NG --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OK --> See step 5
3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND) Disconnect the 1A connector from the engine room junction block. Disconnect the E51 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1A-2 - E51-5 (IG2D) Always Below 1 ohms 1A-2 - Body ground Always 10 kohms or higher 1A-3 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM JUNCTION BLOCK - MAIN BODY ECU AND BODY GROUND) OK: Go to next step
4. INSPECT ENGINE ROOM JUNCTION BLOCK (IG2 RELAY) Disconnect the 1E connector 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 1A-4 - 1E-1 When battery voltage is not applied to terminals 1A-3 and 1A-2 10 kohms or higher 1A-4 - 1E-1 When battery voltage is applied to terminals 1A-3 and 1A-2 Below 1 ohms NG --> REPLACE ENGINE ROOM JUNCTION BLOCK OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
5. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)

This DTC is output when there is a problem in the ACCD output circuit, which is from the inside of the main body ECU (instrument panel junction block) to the ACC relay.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream on. Read the Data List according to the displays on the Techstream. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY 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. NG --> See step 3 OK: Go to next step
2. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Turn the engine switch on (IG). After 10 seconds have elapsed, check if the trouble occurs again. OK DTC B2273 is not output. NG --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OK --> See step 6
3. INSPECT RELAY (ACC RELAY) Remove the ACC relay from the relay block No. 8. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE ACC RELAY OK: Go to next step
4. CHECK HARNESS AND CONNECTOR (ACC RELAY - MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) Disconnect the E50 connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Relay block No. 8 ACC relay terminal 1 - E50-4 (ACCD) Always Below 1 ohms Relay block No. 8 ACC relay terminal 1 or E50-4 (ACCD) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ACC RELAY - MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (ACC RELAY - BATTERY AND BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition Relay block No. 8 ACC relay terminal 2 - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition Relay block No. 8 ACC relay terminal 3 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ACC RELAY - BATTERY AND BODY GROUND) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
6. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)

This DTC is output when there is an open, short, or any other problem in the engine start request output circuit inside the main body ECU (instrument panel junction block) or in the external circuit.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. CHECK FOR DTC Clear the DTC. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Turn the engine switch on (IG). After 15 seconds have elapsed, check if the trouble occurs again. OK DTC B2273 is not output. NG --> See step 2 OK --> See step 4
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) Disconnect the E52 ECU connector. Disconnect the A50 ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E52-4 (STSW) - A50-14 (STSW) Always Below 1 ohms E52-4 (STSW) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) OK: Go to next step
3. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) Reconnect the E52 connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E52-4 (STSW) - Body ground Brake pedal depressed, Engine switch hold on (ST) Output voltage at terminal AM1 or AM2 is -2 V or more. NG --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OK --> See step 5
4. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)
5. REPLACE ECM. Refer to «REMOVAL»(ref-426060-S19785503332011101200000)

The main body ECU (instrument panel junction block) will set this DTC if the ACCR signal sent from the ECM is ON for 40 seconds or more.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. CHECK DTC OUTPUT Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). 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 B2276 is output. NG --> See step 2 OK --> See step 4
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) Disconnect the E52 ECU connector. Disconnect the A50 ECM connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E52-11 (ACCR) - A50-13 (ACCR) Always Below 1 ohms E52-11 (ACCR) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) OK: Go to next step
3. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) Reconnect the E52 connector. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E52-11 (ACCR) - Body ground Brake pedal depressed, shift P, engine switch is pushed once --> on (IG) 0.1 to 0.8 V*1 --> output voltage at terminal AM1 or AM2 is -2 V or more. HINT: *1: Voltage is output only when the engine is cranking. NG --> See step 5 OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
4. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)
5. REPLACE ECM. Refer to «REMOVAL»(ref-426060-S19785503332011101200000)

This DTC is output when the submersion circuit monitor inside the main body ECU (instrument panel junction block) detects that the vehicle is submerged in water.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

This DTC is output when 1) a malfunction is detected between the main body ECU (instrument panel junction block) and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. READ VALUE USING TECHSTREAM (START SWITCH) Connect the Techstream to the DLC3. Check the Data List for proper functioning of the start switch. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Start Switch 1 Start Switch 1 / ON or OFF ON: Engine switch is pushed OFF: Engine switch is not pushed - Start Switch 22 Start Switch 2 / ON or OFF ON: Engine switch is pushed OFF: Engine switch is not pushed - OK ON (engine switch is pushed) and OFF (engine switch is not pushed) appear on the screen. NG --> See step 2 OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
2. INSPECT ENGINE SWITCH Remove the engine switch. Refer to «REMOVAL»(ref-426058-S37650415312011101200000). Disconnect the switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Switch Condition Specified Condition 7 (SS1) - 5 (GND) Pushed Below 1 ohms 2 (SS2) - 5 (GND) Pushed Below 1 ohms 7 (SS1) - 5 (GND) Not pushed 10 kohms or higher 2 (SS2) - 5 (GND) Not pushed 10 kohms or higher HINT: This switch is a momentary type switch. NG --> See step 4 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E51 ECU connector. Disconnect the E38 switch connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E38-7 (SS1) - E51-10 (SSW1) Always Below 1 ohms E38-2 (SS2) - E51-9 (SSW2) Always Below 1 ohms E38-5 (GND) - Body ground Always Below 1 ohms E38-7 (SS1) or E51-10 (SSW1) - Body ground Always 10 kohms or higher E38-2 (SS2) or E51-9 (SSW2) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
4. REPLACE ENGINE SWITCH. Refer to «REMOVAL»(ref-426058-S37650415312011101200000)

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

HINT

If the main body ECU (instrument panel junction block) is replaced with a new one while the cable from the negative (-) battery terminal is connected, the power source mode will be in IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored. After the main body ECU (instrument panel junction block) is replaced, perform the registration procedure for the engine immobilizer system. Refer to REGISTRATION.

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1. CHECK CAN COMMUNICATION SYSTEM Check for CAN communication system DTCs. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-426086-S42356372512011101200000). HINT: If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first. Result Result Proceed to CAN communication DTC is not output A CAN communication DTC is output B B --> See step 5 A: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Turn the engine switch on (IG) and turn the Techstream main switch on. Read the Data List according to the displays on the Techstream. MAIN BODY 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) and "OFF" (P signal is OFF) appear on the screen. NG --> See step 6 OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SHIFT LOCK CONTROL ECU) Disconnect the E50 and E81 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Terminal No. (Symbol) Condition Specified Condition E50-15 (P) - E81-7 (P2) Always Below 1 ohms E50-15 (P) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - SHIFT LOCK CONTROL ECU) OK: Go to next step
4. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OPERATION After replacing the main body ECU (instrument panel junction block) with a normally functioning ECU, check that the engine can start normally. OK Engine can start normally. NG --> See step 7 OK --> END (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) DEFECTIVE)
5. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-426086-S02291935112011101200000)
6. GO TO SHIFT CONTROL SYSTEM. Refer to «INSPECTION»(ref-426023-S36435969952011101200000)
7. REPLACE SHIFT LOCK CONTROL ECU. Refer to «REMOVAL»(ref-426023-S28655428832011101200000)

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 main body ECU (instrument panel junction block). The main body ECU (instrument panel junction block) determines the vehicle speed based on the frequency of these pulse signals.

The main body ECU (instrument panel junction block) and the combination meter are connected by a cable and the CAN. DTC B2282 is output when the cable information and CAN information are inconsistent.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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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 above will not operate normally.

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1. CHECK CAN COMMUNICATION SYSTEM Check for CAN communication system DTCs. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-426086-S42356372512011101200000). HINT: If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first. Result Result Proceed to CAN communication DTC is not output A CAN communication DTC is output B B --> See step 6 A: Go to next step
2. CHECK SPEEDOMETER OPERATION Connect the Techstream to the DLC3. Turn the engine switch on (IG). Enter the following menus: Body Electrical / Combination Meter / Data List. Check the values by referring to the values in the table below. COMBINATION METER Tester Display Measurement Item/Range Normal Condition Diagnostic Note Vehicle Speed Meter Vehicle speed/Min.: 0 km/h (0mph), Max.: 255 km/h (158 mph) Almost same as actual speed (When driving) - OK Vehicle speed displayed on the Techstream is almost the same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer). NG --> See step 7 OK: Go to next step
3. READ VALUE USING TECHSTREAM (VEHICLE SPEED SIGNAL) Connect the Techstream to the DLC3. Turn the engine switch on (IG). Read the Data List according to the displays on the Techstream. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Vehicle Speed Signal Vehicle speed signal / STOP or RUN STOP: Vehicle is stopped Run: Vehicle is running - OK "STOP" (Vehicle is stopped) and "OFF" (Vehicle is running) appear on the screen. Proceed to the next step based on the inspection result. Result Result Proceed to OK A NG B B --> See step 4 A --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - INSTRUMENT PANEL JUNCTION BLOCK) Disconnect the E46 meter connector. Disconnect the 2E connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2E-1 (SPD) - E46-36 (+S) Always Below 1 ohms 2E-1 (SPD) or E46-36 (+S) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - INSTRUMENT PANEL JUNCTION BLOCK) OK: Go to next step
5. INSPECT COMBINATION METER Check the output waveform. Remove the combination meter with the connector(s) still connected. Refer to «REMOVAL»(ref-426052-S32990996932011101200000). Connect the oscilloscope to terminals E46-36 (+S) and body ground. Turn the engine switch on (IG). Turn the wheel slowly. Check the signal waveform according to the condition(s) in the table below. Item Condition Tool setting 5 V/DIV., 20 ms./DIV Vehicle condition Driving at approx. 20 km/h OK The waveform is displayed as shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. NG --> See step 8 OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
6. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-426086-S02291935112011101200000)
7. GO TO METER / GAUGE SYSTEM (SPEEDOMETER MALFUNCTION). Refer to «Speedometer Malfunction»(ref-426050-S04542486232011101200000)
8. GO TO METER / GAUGE SYSTEM. Refer to «Speed Signal Circuit»(ref-426050-S35949142762011101200000)

HINT

When the main body ECU is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU is replaced, perform the registration procedures for the engine immobilizer system. Refer to HOW TO PROCEED WITH TROUBLESHOOTING.

Scheme 88

This DTC is output when serial communication signals and LIN communication signals in the circuit between the main body ECU (instrument panel junction block) and steering lock actuator (steering lock ECU) are inconsistent.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) or steering lock ECU is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Check the Data List for proper functioning of the steering lock function. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Steering Unlock Switch Steering lock condition / ON or OFF ON: Steering is unlocked (Engine switch on (ACC)) OFF: Steering is locked (Engine switch off) - OK ON (steering is unlocked) and OFF (steering is locked) appear on the screen. NG --> See step 3 OK: Go to next step
2. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Check for DTC B2285 (Steering lock position signal circuit malfunction), DTC B2287 (LIN communication master malfunction) and DTC B2785 (Communication malfunction between ECUs connected by LIN). Result Display (DTC output) Proceed to "DTC B2285" only A "DTC B2287" and/or "DTC B2785" B No DTC C HINT: If DTC B2287 is output. Refer to «DTC B2287: LIN Communication Master Malfunction»(ref-426122-S36890519662011101200000). If DTC B2785 is output. Refer to «DTC B2785: Communication Malfunction between ECUs Connected by LIN»(ref-426150-S21535786832011101200000). C --> CHECK INTERMITTENT PROBLEMS B --> See step 5 A --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - STEERING LOCK ECU) Disconnect the E50, 2C and E39 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E50-18 (SLP) - E39-4 (SLP1) Always Below 1 ohms 2C-12 (LIN1) - E39-5 (LIN) Always Below 1 ohms E50-18 (SLP) or E39-4 (SLP1) - Body ground Always 10 kohms or higher 2C-12 (LIN1) or E39-5 (LIN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
4. CHECK MAIN BODY ECU OPERATION After replacing the main body ECU with a normally functioning ECU, check that the engine starts. Make sure the brake pedal is depressed and the shift position is P at this time. Check that the engine switch mode can be changed by pushing the engine switch. HINT: Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC) to on (IG) and back to off. With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status. OK Engine starts normally. NG --> See step 6 OK --> END (MAIN BODY ECU DEFECTIVE)
5. GO TO DTC CHART. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-426149-S19879928792011101200000)
6. REPLACE STEERING LOCK ECU. Refer to «DISASSEMBLY - Step 1»(ref-425883-S38018252072011101200000)

This DTC is output when serial communication signals and CAN communication signals in the circuit between the main body ECU (instrument panel junction block) and ECM are inconsistent.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to HOW TO PROCEED WITH TROUBLESHOOTING.

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1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM) Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Check for CAN communication system. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-426086-S42356372512011101200000). HINT: If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first. OK DTC is not output. NG --> See step 4 OK: Go to next step
2. READ VALUE USING TECHSTREAM Connect the Techstream to the DLC3. Check the Data List for proper functioning of the engine. HINT: When using the Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the Techstream and vehicle starts. MAIN BODY Tester Display Measurement Item/Range Normal Condition Diagnostic Note Engine Condition Engine condition/STOP or RUN Stop: Engine is stopped RUN: Engine is running - NG --> See step 3 OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) Disconnect the A50 ECM connector. Disconnect the E52 ECU connector. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E52-2 (TACH) - A50-15 (TACH) Always Below 1 ohms E52-2 (TACH) or A50-15 (TACH) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) - ECM) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
4. GO TO CAN COMMUNICATION SYSTEM. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-426086-S02291935112011101200000)

DTC B2287 Refer to. DESCRIPTION.

This DTC is output when the main body ECU (instrument panel junction block) cannot detect the unlock condition of the steering lock within a specified time.

HINT

When the main body ECU (instrument panel junction block) is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

Scheme 93

This DTC is output when there is a LIN communication problem between the main body ECU (instrument panel junction block) and certification ECU (smart key ECU assembly) or when there is a problem in the entry function.

HINT

After the main body ECU (instrument panel junction block) is replaced, perform the registration procedures for the engine immobilizer system. Refer to REGISTRATION.

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1. CHECK FOR DTC Clear the DTCs. Refer to «DTC CHECK / CLEAR»(ref-426069-S15651840322011101200000). Check for DTC B2289 (Key collection waiting time over) and B2785 (Communication malfunction between ECUs connected by LIN). Result Display (DTC output) Proceed to "DTC B2289" only A "DTC B2785" only B No DTC C HINT: If DTC B2785 is output, perform troubleshooting for DTC B2785 first. C --> See step 5 B --> See step 4 A: Go to next step
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - CERTIFICATION ECU) Disconnect the E36 ECU and 2C junction block connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2C-12 (LIN1) - E36-10 (LIN) Always Below 1 ohms 2C-12 (LIN1) or E36-10 (LIN) - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - CERTIFICATION ECU) OK: Go to next step
3. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) OPERATION After replacing the main body ECU (instrument panel junction block) with a normally functioning ECU, check that the engine starts. OK Engine starts normally. HINT: If the engine does not start, refer to Problem Symptoms Table of the smart key system (entry function) (Room Oscillator does not Recognized Key). NG --> See step 6 OK --> END (MAIN BODY ECU DEFECTIVE)
4. GO TO DTC B2785. Refer to «DTC B2785: Communication Malfunction between ECUs Connected by LIN»(ref-426150-S21535786832011101200000)
5. USE SIMULATION METHOD TO CHECK. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-425882-S10776939152011101200000)
6. GO TO SMART KEY SYSTEM (ENTRY FUNCTION). Refer to «Room Oscillator does not Recognize Key»(ref-426154-S11064932552011101200000)

When the engine switch is pushed with the electrical key in the cabin, the main body ECU (instrument panel junction block) receives signals to switch the power source mode.

HINT

To allow use of the Techstream to inspect the push-button start function when the engine switch is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the Techstream and the main body ECU (instrument panel junction block). (Opening and closing a door can also be simulated by operating a door courtesy light switch.)

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1. CHECK SMART KEY SYSTEM Remove the battery of the electrical key transmitter. Refer to «REMOVAL - Step 1»(/toyota/corolla/x-2010-2013/remont/door-locks-anti-theft-systems/#door-lock-control-transmitter-w-smart-key-system-service-information) . Touch the logo side mark of the key or card key to the engine witch. Check that the engine switch can be turned on (IG). Result Result Proceed to Power source mode does not change to on (ACC) A Power source mode does not change to on (IG) B Power source mode does not change to on (IG and ACC) C Power source mode is turned on D D --> See step 18 C --> See step 14 B --> See step 6 A: Go to next step
2. INSPECT ACC RELAY Remove the ACC relay from the relay block No. 8. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE ACC RELAY OK: Go to next step
3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ACC RELAY) Disconnect the E50 connector from the main body ECU (instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E50-4 (ACCD) - Relay block No. 8 ACC relay terminal 1 Always Below 1 ohms E50-4 (ACCD) or Relay block No. 8 ACC relay terminal 1 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - ACC RELAY) OK: Go to next step
4. INSPECT FUSE (ACC-B FUSE) Remove the ACC-B fuse from the main body ECU (instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition ACC-B fuse Always Below 1 ohms NG --> REPLACE FUSE (ACC-B FUSE) OK: Go to next step
5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - ACC RELAY) Disconnect the 2M connector from the main body ECU (instrument panel junction block) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2M-9 - Relay block No. 8 ACC relay terminal 3 Always Below 1 ohms 2M-9 or Relay block No. 8 ACC relay terminal 3 - Body ground Always 10 k ohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - ACC RELAY) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK
6. INSPECT IG1 RELAY Remove the IG1 relay from the main body ECU (instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kohms or higher 3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 ohms NG --> REPLACE IG1 RELAY OK: Go to next step
7. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INSTRUMENT PANEL JUNCTION BLOCK) Disconnect the E51 and 2F connectors from the main body ECU (Instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E51-6 (IG1D) - 2F-3 Always Below 1 ohms E51-6 (IG1D) or 2F-3 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - INSTRUMENT PANEL JUNCTION BLOCK) OK: Go to next step
8. CHECK HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND) Disconnect the 2E connector from main body ECU (Instrument panel junction block). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2E-17 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND) OK: Go to next step
9. INSPECT FUSE (IG2 FUSE) Remove the IG2 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 IG2 fuse Always Below 1 ohms NG --> REPLACE FUSE (IG2 FUSE) OK: Go to next step
10. CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM RELAY BLOCK) Disconnect the 1E connector from engine room relay block. Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 1E-1 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ENGINE ROOM RELAY BLOCK) OK: Go to next step
11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ENGINE ROOM RELAY BLOCK) Disconnect the E51 connector from the main body ECU (instrument panel junction block). Disconnect the 1A connector from engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E51-5 (IG2D) - 1A-2 Always Below 1 ohms E51-5 (IG2D) or 1A-2 - Body ground Always 10 kohms or higher NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - ENGINE ROOM RELAY BLOCK) OK: Go to next step
12. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1A-3 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BODY GROUND) OK: Go to next step
13. INSPECT ENGINE ROOM RELAY BLOCK (IG2 RELAY) Remove the engine room relay block. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 1E-1 - 1A-4 When battery voltage is not applied to terminals 1A-2 and 1A-3 10 kohms or higher 1E-1 - 1A-4 When battery voltage is applied to terminals 1A-2 and 1A-3 Below 1 ohms NG --> REPLACE ENGINE ROOM RELAY BLOCK OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
14. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK) Disconnect the 2G connector from main body ECU (Instrument panel junction block). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition 2G-1 - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK) OK: Go to next step
15. CHECK HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND) Disconnect the 2E connector from main body ECU (instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition 2E-17 - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BODY GROUND) OK: Go to next step
16. CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) Disconnect the E50 and E51 connectors from the main body ECU (Instrument panel junction block). Measure the voltage according to the value(s) in the table below. Standard Voltage Tester Connection Condition Specified Condition E50-6 (AM2) - Body ground Always 11 to 14 V E51-1 (AM1) - Body ground Always 11 to 14 V NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - MAIN BODY ECU) OK: Go to next step
17. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BODY GROUND) Disconnect the E51 connector from main body ECU (Instrument panel junction block). Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E51-4 (GND2) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU - BODY GROUND) OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
18. GO TO SMART KEY SYSTEM (ENTRY FUNCTION). Refer to «Room Oscillator does not Recognize Key»(ref-426154-S11064932552011101200000)

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1. ENGINE START SYSTEM FUNCTION If the engine switch is pressed with the shift lever is in P or N and the brake pedal depressed, the main body ECU (instrument panel junction block) determines that it is an engine start request. The certification ECU (smart key ECU assembly) and other ECUs perform key verification via the LIN communication line. The main body ECU (instrument panel junction block) activates the ACC relay. The main body ECU (instrument panel junction block) activates the IG1 and IG2 relays. The certification ECU (smart key ECU assembly) outputs a steering UNLOCK signal. The signal is sent to the main body ECU (instrument panel junction block) via the steering lock ECU. The main body ECU (instrument panel junction block) sends an engine start request signal to the ECM. The ECM sends an ACC cut request signal to the main body ECU (instrument panel junction block). The ECM and main body ECU (instrument panel junction block) activate the starter relay. The main body ECU (instrument panel junction block) deactivates the ACC relay until the main body ECU (instrument panel junction block) detects an engine start. When engine revolution speed reaches 1200 RPM, the ECM determines that the engine has been started. The ECM stops sending an ACC cut request signal to the main body ECU. The main body ECU (instrument panel junction block) reactivates the ACC relay and turns off the engine switch indicator light, when engine revolution speed reaches 800 RPM. Symbol of Main Body ECU Signal STP Stop light switch ON signal Input SSW1/SSW2 Engine switch ON signal Input ACCD ACC relay operation signal Output SLP Steering lock actuator position signal Input IG1D IG1 relay operation signal Output IG2D IG2 relay operation signal Output STR2 Starter relay operation signal (Sub) Output STR Park/Neutral position switch signal Input TACH Engine start detection signal Input STSW Starter activation request signal Output ACCR ACC cut request signal Input Symbol of ECM Signal ACCR ACC cut request signal Output TACH Engine revolution speed signal Output STSW Starter activation request signal Input STAR Starter relay operation signal (Main) Output STA Starter activation signal Input

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

ENGINE SWITCH INDICATOR LIGHT CONDITION

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1. INSPECT ENGINE SWITCH Remove the engine switch. Refer to «REMOVAL»(ref-426058-S37650415312011101200000). Apply battery voltage between the terminals of the switch, and check the illumination condition of the switch. NOTE: If the positive (+) lead and the negative (-) lead are incorrectly connected, the engine switch indicator will not illuminate. If the voltage is too low, the indicator will not illuminate. OK Measurement Condition Specified Condition Battery positive (+) --> Terminal 11 (SWIL) Battery negative (-) --> Terminal 4 (COM) or 5 (GND) Illuminates Battery positive (+) --> Terminal 12 (INDS) Battery negative (-) --> Terminal 4 (COM) or 5 (GND) Illuminates Battery positive (+) --> Terminal 13 (INDW) Battery negative (-) --> Terminal 4 (COM) or 5 (GND) Illuminates NG --> See step 3 OK: Go to next step
2. CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) Disconnect the E38 switch connector. Disconnect the E51 and E52 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard Resistance Tester Connection Condition Specified Condition E38-11 (SWIL) - E51-8 (SWIL) Always Below 1 ohms E38-12 (INDS) - E52-1 (INDS) E38-13 (INDW) - E52-8 (INDW) E38-5 (GND) - Body ground E38-4 (COM) - Body ground E38-11 (SWIL) or E51-8 (SWIL) - Body ground 10 kohms or higher E38-12 (INDS) or E52-1 (INDS) - Body ground E38-13 (INDW) or E52-8 (INDW) - Body ground NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK --> REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)
3. REPLACE ENGINE SWITCH. Refer to «REMOVAL»(ref-426058-S37650415312011101200000)

See also:
• REMOVAL - Step 1