Dtcs in this ecu что это
Dtcs in this ecu что это
If the engine switch is pressed with the clutch pedal depressed, the main body ECU determines that it is an engine start request.
The certification ECU and other ECUs perform key verification via the LIN communication line.
The main body ECU activates the ACC relay.
The main body ECU activates the IG1 and IG2 relays.
The certification ECU outputs a steering UNLOCK signal. The signal is sent to the main body ECU via the steering lock ECU.
The main body ECU sends an engine start request signal to the ECM.
The ECM sends an ACC cut request signal to the main body ECU.
The ECM and main body ECU activate the starter relay.
The main body ECU deactivates the ACC relay until the ECU detects an engine start.
When engine revolution speed reaches 1200 rpm, the ECM determines that the engine has been started.
The ECM stops sending on ACC cut request signal to the main body ECU.
The main body ECU reactivates the ACC relay and turns off the engine switch indicator light, when engine revolution speed reaches 800 rpm.
| Symbols of main body ECU | Signals | |
| STP | Stop light switch ON signal | Input |
| SSW1/SSW2 | Engine switch ON signal | Input |
| ACCD | ACC relay operation signal | Output |
| IG1D | IG1 relay operation signal | Output |
| IG2D | IG2 relay operation signal | Output |
| STR2 | Starter relay operation signal (Sub) | Output |
| STR | Clutch pedal switch signal | Input |
| TACH | Engine start detection signal | Input |
| STSW | Starter activation request signal | Output |
| ACCR | ACC cut request signal | Input |
| Symbols of ECM | Signals | |
| 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 |
WIRING DIAGRAM
See CRANKING HOLDING FUNCTION CIRCUIT (See page Нажмите здесь).
INSPECTION PROCEDURE
УКАЗАНИЕ: After the main body ECU, certification ECU, steering lock ECU, ID code box and/or ECM are/is replaced, perform the registration procedures for the engine immobiliser system.
| 1.CHECK ENTRY FUNCTION DETECTION AREA |
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Inspect entry detection area.
When the electrical key is in either of the 2 inspection points in the illustration, the clutch pedal is depressed, check that the engine switch indicator illuminates in green.
OK: Engine switch illuminates in green.
УКАЗАНИЕ: If the engine switch does not illuminate, perform troubleshooting according to the PROBLEM SYMPTOMS TABLE of the entry and start system (starting) (engine switch indicator light does not come on) (See page Нажмите здесь) and the entry and start system (entry door lock) (room oscillator does not Recognize key) (for sedan: See page Нажмите здесь) (for hatchback: See page Нажмите здесь).
Turn the engine switch off.
When the clutch pedal is depressed, check if the engine can be started.
Open and close the driver’s door.
When the clutch pedal is depressed, check if the engine can be started.
OK: Steering lock/unlock function operates normally and engine can be started.
УКАЗАНИЕ: After the battery is discharged and then recharged, the engine may not start unless the steering lock is initialized using the above procedure (See page Нажмите здесь).
Delete the DTCs (See page Нажмите здесь).
Check for DTCs again.
OK: No DTC is output.
Check the power source mode changes.
When the key is inside the vehicle, check that pressing the engine switch causes the power source mode to change as follows:
OK: off → on (ACC) → on (IG) → off
Check the engine cranking function.
When there is fuel in the fuel tank, the key is inside the vehicle, check that depressing the clutch pedal and pressing the engine switch crank the engine.
Result:
| Result | Proceed to |
| Engine does not crank | A |
| Engine cranks | B |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Read the DATA LIST according to the displays on the tester screen.
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| N SW / C SW | Clutch pedal switch / ON or OFF | ON: Clutch pedal depressed OFF: Clutch pedal released | — |
OK: ON (Clutch pedal depressed) and OFF (Clutch pedal released)
Proceed to the next step based on the inspection result.
Result:
| Result | Proceed to |
| OK | A |
| NG | B |
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Remove the clutch pedal switch (See page Нажмите здесь).
Measure the resistance according to the value(s) in the table below.
Disconnect the E52 ECU connector.
Disconnect the A50 ECM connector.
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Disconnect the A5 clutch pedal switch connector.
Measure the resistance according to the value(s) in the table below.
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Str Unlock SW | 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.
УКАЗАНИЕ: If the result is not as specified, perform troubleshooting for DTCs B2285 (Steering lock position signal circuit malfunction) (See page Нажмите здесь) and B2288 (Steering lock signal circuit malfunction) first (See page Нажмите здесь).
Check if the steering lock is released when turning the engine switch on (ACC).
OK: The steering lock is released.
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Measure the voltage according to the value(s) in the table below.
УКАЗАНИЕ: If the result is not as specified, perform troubleshooting for DTC B2275 (STSW monitor malfunction) first.
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Measure the voltage according to the value(s) in the table below.
* : Voltage is output only when the engine is cranking.
УКАЗАНИЕ: If the result is not as specified, perform troubleshooting for DTC B2276 (ACCR signal circuit malfunction) first.
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Measure the voltage according to the value(s) in the table below.
Proceed to the next step based on the inspection result.
Result:
| Result | Proceed to |
| NG | A |
| OK | B |
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Remove the starter cut relay.
Measure the resistance according to the value(s) in the table below.
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Disconnect the B31 ECM connector.
Measure the voltage according to the value(s) in the table below.
* : Voltage is output for 0.3 seconds when the engine is cracking to start. Disconnect the B31 connector from the ECM before measuring the voltage.
Disconnect the E52 ECU connector.
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Disconnect the B31 ECM connector.
Remove the starter cut relay from the relay block No. 6.
Measure the resistance according to the value(s) in the table below.
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Remove the starter relay from the relay block No. 5.
Measure the resistance according value(s) in the table below.
Disconnect the A50 ECM connector.
Remove the starter relay from the relay block No. 5.
Measure the resistance according to the value(s) in the table below.
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Measure the voltage according to the value(s) in the table below.
|
|
| OK | |
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| 20.INSPECT STARTER ASSEMBLY |
УКАЗАНИЕ: (for TMC made: See page Нажмите здесь). (for TMUK and TMMT made: See page Нажмите здесь).
Reconnect the connectors.
Connect the intelligent tester to the DLC3.
УКАЗАНИЕ: When using the intelligent tester 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 tester and vehicle starts.
Turn the engine switch on (IG).
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| L Code Chk | L code check / OK or NG | OK: Normal NG: Malfunction | Electrical key in the cabin |
OK: OK is displayed on the screen.
УКАЗАНИЕ: If the result is not as specified, refer to PROBLEM SYMPTOMS TABLE of the electrical steering lock (steering wheel cannot be unlocked) (See page Нажмите здесь). If the result is not as specified, there may be a malfunction with the steering lock ECU or the ID code box.
Connect the intelligent tester to the DLC3.
УКАЗАНИЕ: When using the intelligent tester 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 tester and vehicle starts.
Turn the engine switch on (IG)
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Start Rqst | Start request signal response / OK or NG | OK: Received NG: Not received | — |
OK: OK (received) and NG (not receive) appear on the screen.
УКАЗАНИЕ: If the result is not as specified, there may be a malfunction with the certification ECU or the ID code box.
Connect the intelligent tester to the DLC3.
УКАЗАНИЕ: When using the intelligent tester 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 tester and vehicle starts.
Turn the engine switch on (IG).
| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| S Code Chk | S code check / OK or NG | OK: Normal OFF: Malfunction | — |
OK: OK is displayed on the screen.
Check the input signal waveform.
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Connect an oscilloscope to terminal E22-6 (EFIO) and body ground.
Turn the engine switch on (IG).
Check the signal waveform according to the condition(s) in the table below.
| Item | Condition |
| Tool setting | 10 V/DIV., 100 ms./DIV. |
| Vehicle condition | Engine switch on (IG) |
Replace the certification ECU.
Perform the registration procedures for the engine immobiliser system.