Toyota Sienna Service Manual: Terminals of ECM
1. SFI SYSTEM
HINT: The standard normal voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.
The check results should be compared with the standard normal voltage for that pair of terminals, listed in the "Specified Condition" column.
The illustration above can be used as a reference to identify the ECM terminal locations.
*1: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
- WAVEFORM 1
- Camshaft Timing Oil Control Valve (OCV) operation signal
HINT: The wavelength becomes shorter as the engine rpm increases.
- WAVEFORM 2
- Heated oxygen sensor signal
HINT: In the DATA LIST, item O2S B1S2 shows the ECM input values from the heated oxygen sensor.
- WAVEFORM 3
- Fuel injector operation signal
HINT: The wavelength becomes shorter as the engine rpm increases.
- WAVEFORM 4
- Knock sensor signal
HINT:
- The wavelength becomes shorter as the engine rpm increases.
- The waveforms and amplitudes displayed differ slightly depending on the vehicle.
- WAVEFORM 5
- Variable Valve Timing (VVT) sensor signal (1)
- Crankshaft position sensor signal (2)
HINT: The wavelength becomes shorter as the engine rpm increases.
- WAVEFORM 6
- Igniter IGT signal (from ECM to igniter) (1)
- Igniter IGF signal (from igniter to ECM) (2)
HINT: The wavelength becomes shorter as the engine rpm increases.
- WAVEFORM 7
- Purge VSV for EVAP system operation signal
HINT: If the waveform is not similar to that shown in the illustration, check the waveform again after idling for 10 minutes or more.
- WAVEFORM 8
- Vehicle speed signal
HINT:
- The wavelength becomes shorter as the vehicle speed increases.
- Depending on the vehicle, the output waveform voltage may rise to 12 V if influenced by optionally installed systems.
- WAVEFORM 9
- Throttle drive motor operation signal (positive terminal)
HINT: The duty ratio varies depending on the throttle actuator operation.
- WAVEFORM 10
- Throttle drive motor operation signal (negative terminal)
HINT: The duty ratio varies depending on the throttle actuator operation.
- WAVEFORM 11
- Engine speed signal
HINT: The wavelength becomes shorter as the engine rpm increases.
Problem symptoms table
HINT:
When a malfunction is not confirmed by a DTC (Diagnostic
Trouble Code) check and the cause of problem cannot be
identified through a basic inspection, troubleshoot according
to the priority ...
Diagnosis system
1. DESCRIPTION
When troubleshooting OBD II (On-Board
Diagnostics) vehicles, an intelligent tester
(complying with SAE J1987) must be connected to
the DLC3 (Data Link Connector 3) o ...
Other materials:
Short to GND in CAN Bus Line
DESCRIPTION
A short to GND is suspected in the CAN bus wire when the resistance between
terminals 4 (CG) and 6
(CANH), or terminals 4 (CG) and 14 (CANL) of the DLC3 is below 200 Ω.
Symptoms
Trouble Area
The resistance between terminals 6 (CANH) and 4 (CG), or ter ...
Removal
1. RECOVER REFRIGERANT FROM REFRIGERATION
SYSTEM (See page AC-172)
2. REMOVE FRONT WIPER ARM HEAD CAP (See page
WW-4)
3. REMOVE FRONT WIPER ARM RH (See page WW-4)
4. REMOVE FRONT WIPER ARM LH (See page WW-4)
5. REMOVE COWL TOP VENTILATOR LOUVER SUBASSEMBLY
(See page WW-4)
6. REMOVE WINDSHIEL ...
Communication Error from ECM to VSC
DTC P1631 Communication Error from ECM to VSC
DTC U0100 Lost Communication with ECM/PCM "A"
DESCRIPTION
The ECM sends signals such as A/T information signals, dynamic laser cruise
control operation signals,
brake operation demand signals, and buzzer operation demand signals to the sk ...
