Terminals Of Ecu
HINT:
- For the layout of the certification ECU (smart key ECU assembly) terminals, refer to the following. Refer to TERMINALS OF ECU .
- For the layout of the ID code box (immobilizer code ECU) terminals, refer to the following. Refer to TERMINALS OF ECU .
- For the layout of the steering lock ECU terminals, refer to the following. Refer to TERMINALS OF ECU .
- CHECK POWER SOURCE CONTROL ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect the C42 and C43 connectors.
- Measure the voltage and resistance according to the value(s) in the table below.
Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item C42-2 (STA) - Body ground Input LG - Body ground Determines whether engine is being started by monitoring starter relay activation voltage from terminal STAR during engine start 20°C (68°F) 93.8 to 136.4 Ω - C42-3 (STAR) - Body ground Output W - Body ground Starter relay activation output - Outputs starter relay activation voltage (12 V) when engine is being started. Outputs for maximum of 30 seconds. Turns off when engine speed is 500 rpm or more for 500 milliseconds or more.
- for Automatic Transaxle:
When engine switch is on (IG), monitors whether park/neutral position switch is on (shift lever in P or N) or off (shift lever not in P or N). Outputs 12 V through large resistance in ECM. When park/neutral position switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When park/neutral position switch is off, terminal STAR voltage is high (approximately 10.5 V).
- for Manual Transaxle:
When engine switch is on (IG), monitors whether clutch pedal switch is on (clutch pedal depressed) or off (clutch pedal released). Outputs 12 V through large resistance in ECM. When clutch pedal switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When clutch pedal switch is off, terminal STAR voltage is high (approximately 10.5 V).
HINT:
When voltage is high, start signal (STAR) is not output even if start command signal (STSW) is input.for Automatic Transaxle: - Shift lever not in P or N → Shift lever in P or N (20°C [68°F])
for Manual Transaxle:- Clutch pedal released → Clutch pedal depressed
10 kΩ or higher → 93.8 to 136.4 Ω - -
- Neutral SW/ Clutch SW
- Neutral SW/ Clutch SW
C42-4 (NE) - Body ground Input BE - Body ground Engine speed signal Always 10 kΩ or higher Engine Condition C42-8 (IG2D) - Body ground Output GR - Body ground IG2 signal 20°C (68°F) 255 to 387 Ω IG2 Relay Monitor(Outside) C42-11 (STP1) - Body ground Input LG - Body ground Stop light switch signal (for Automatic Transaxle) Brake pedal depressed → Brake pedal released 9 V or higher → 1 V or less Stop Light Switch1 C43-1 (AM22) - Body ground Input R - Body ground +B power supply Always 9.5 to 14 V - C43-2 (AM21) - Body ground Input R - Body ground +B power supply Always 9.5 to 14 V - C43-3 (SLP) - Body ground Input G - Body ground Steering lock bar position signal Always 10 kΩ or higher Steering Unlock Switch C43-5 (GND2) - Body ground - BR - Body ground Ground Always Below 1 Ω - C43-6 (GND) - Body ground - W-B - Body ground Ground Always Below 1 Ω - C43-11 (CA3N) - Body ground Input/Output G - Body ground CAN communication line Always 10 kΩ or higher - C43-12 (CA3P) - Body ground Input/Output LG - Body ground CAN communication line Always 10 kΩ or higher - C43-13 (CA1L) - Body ground Input/Output W - Body ground CAN communication line Always 10 kΩ or higher - C43-14 (CA1H) - Body ground Input/Output B - Body ground CAN communication line Always 10 kΩ or higher - C43-17 (SSW2) - Body ground Input R - Body ground SSW2 contact signal (backup for SSW1 and has same behavior as SSW1) Engine switch pushed → Engine switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch2 C43-18 (SSW1) - Body ground Input Y - Body ground SSW1 contact signal Engine switch pushed → Engine switch not pushed Below 1 Ω → 10 kΩ or higher Start Switch1 C43-19 (ACCD) - Body ground Output B - Body ground ACC signal 20°C (68°F) 181.82 to 272.73 Ω ACC Relay Monitor C43-20 (IG1D) - Body ground Output GR - Body ground IG1 signal 20°C (68°F) 181.82 to 272.73 Ω IG1 Relay Monitor(Outside) C43-24 (LIN2) - Body ground Input/Output R - Body ground LIN communication line Always 10 kΩ or higher - If the result is not as specified, there may be a malfunction in the wire harness.
- Reconnect the C42 and C43 connectors.
- Measure the voltage according to the value(s) in the table below.
Terminal No. (Symbol) Input/Output Wiring Color Terminal Description Condition Specified Condition Related Data List Item C42-2 (STA) - C43-6 (GND) Input LG - W-B Determines whether engine is being started by monitoring starter relay activation voltage from terminal STAR during engine start for Automatic Transaxle: - With brake pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)
for Manual Transaxle:- With clutch pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)
6 V or higher*2 → 1.5 V or less - C42-3 (STAR) - C43-6 (GND) Output W - W-B Starter relay activation output - Outputs starter relay activation voltage (12 V) when engine is being started. Outputs for maximum of 30 seconds. Turns off when engine speed is 500 rpm or more for 500 milliseconds or more.
- for Automatic Transaxle:
When engine switch is on (IG), monitors whether park/neutral position switch is on (shift lever in P or N) or off (shift lever not in P or N). Outputs 12 V through large resistance in ECM. When park/neutral position switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When park/neutral position switch is off, terminal STAR voltage is high (approximately 10.5 V).
- for Manual Transaxle:
When engine switch is on (IG), monitors whether clutch pedal switch is on (clutch pedal depressed) or off (clutch pedal released). Outputs 12 V through large resistance in ECM. When clutch pedal switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When clutch pedal switch is off, terminal STAR voltage is high (approximately 10.5 V).
HINT:
When voltage is high, start signal (STAR) is not output even if start command signal (STSW) is input.for Automatic Transaxle: - With brake pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)
for Manual Transaxle:- With clutch pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)
6 V or higher*2 → 1.8 V or less - -
- Neutral SW/ Clutch SW
- Neutral SW/ Clutch SW
C42-4 (NE) - C43-6 (GND) Input BE - W-B Crankshaft position sensor signal Idling with warm engine Pulse generation
(See waveform 1 in 1)Engine Condition C42-8 (IG2D) - C43-6 (GND) Output GR - W-B IG2 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG2 Relay Monitor(Outside) C42-11 (STP1) - C43-6 (GND) Input LG - W-B Stop light switch signal (for Automatic Transaxle) Brake pedal released → Brake pedal depressed 1 V or less → 9 V or higher Stop Light Switch1 C43-3 (SLP) - C43-6 (GND) Input G - W-B Steering lock bar position signal Steering locked → Steering unlocked*1 9 V or higher → 1.2 V or less Steering Unlock Switch C43-8 (SLR+) - C43-6 (GND) Output P - W-B Steering lock motor activation command signal (motor activation permission signal sent from power source control ECU) Steering lock motor operating → Steering lock motor not operating → Steering lock motor operating*3 Pulse generation
(See waveform 2 in 2)- C43-10 (INDW) - C43-6 (GND) Output B - W-B Engine switch indicator (amber) illumination output for Automatic Transaxle: - Brake pedal released, shift lever in P, engine switch on (ACC), or on (IG) → Other than previous condition
for Manual Transaxle:- Clutch pedal released, engine switch on (ACC), or on (IG) → Other than previous condition
7 V or higher → 1 V or less - C43-16 (P) - C43-6 (GND) Input BE - W-B Shift lever P position switch signal (for Automatic Transaxle) Shift lever in P → Shift lever not in P 9 V or higher → 1.5 V or less Shift P Signal C43-17 (SSW2) - C43-6 (GND) Input R - W-B SSW2 contact signal (backup for SSW1 and has same behavior as SSW1) Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch2 C43-18 (SSW1) - C43-6 (GND) Input Y - W-B Engine switch signal Engine switch not pushed → Engine switch pushed 9 V or higher → 1 V or less Start Switch1 C43-19 (ACCD) - C43-6 (GND) Output B - W-B ACC signal Engine switch off → Engine switch on (ACC) 1 V or less → 8.5 V or higher ACC Relay Monitor C43-20 (IG1D) - C43-6 (GND) Output GR - W-B IG1 signal Engine switch on (ACC) → Engine switch on (IG) 1 V or less → 9 V or higher IG1 Relay Monitor(Outside) C43-22 (INDS) - C43-6 (GND) Output W - W-B Engine switch indicator (green) illumination output for Automatic Transaxle: - Brake pedal depressed, shift lever in P → Other than previous condition
for Manual Transaxle:- Clutch pedal depressed → Other than previous condition
7 V or higher → 1 V or less - C43-23 (SPD) - C43-6 (GND) Input LG - W-B Vehicle speed signal Engine switch on (IG), vehicle driven at approx. 5 km/h (3 mph) Pulse generation
(See waveform 3 in 3)Vehicle Speed Signal HINT:
- *1: When the shift lever is in P (for Automatic Transaxle) and the engine switch is off, if any door is opened or closed, the steering is locked. When the electrical key transmitter is inside the vehicle and the engine switch is turned on (ACC) or on (IG), the steering unlocks.
- *2: When the engine is cranking, the battery voltage may momentarily drop to approximately 6 V.
- *3: The steering lock motor operates when the following conditions are met and a door is opened:
- The shift lever is in P (for Automatic Transaxle).
- While carrying the electrical key transmitter, the engine switch is turned on (IG) to unlock the steering, and then the engine switch is turned off.
- Using an oscilloscope, check the waveform of the ECU.
- Waveform 1
Item Content Tester Connection C42-4 (NE) - C43-6 (GND) Tool Setting 1 V/DIV., 2 ms./DIV. Vehicle Condition Idling with warm engine HINT:
The wavelength becomes shorter as the engine speed increases.
- Waveform 2
Item Content Tester Connection C43-8 (SLR+) - C43-6 (GND) Tool Setting 2 V/DIV., 200 ms./DIV. Vehicle Condition Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating TEXT IN ILLUSTRATION*a Steering lock motor not operating *b Steering lock motor operating - Waveform 3
Item Content Tester Connection C43-23 (SPD) - C43-6 (GND) Tool Setting 5 V/DIV., 100 ms./DIV. Vehicle Condition Engine switch on (IG), vehicle driven at approx. 5 km/h (3 mph) HINT:
The wavelength becomes shorter as the vehicle speed increases.
- Waveform 1