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:
ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned to the ON position, the battery voltage is
applied to terminal IGSW of
the ECM. The ECM MREL output signal causes a current to flow to the coil,
closing the contacts of the EFI
relay and supplying power to terminal +B of the ECM.
If the igniti ...
Installation
1. INSTALL SPIRAL CABLE
Check that the front wheels are facing straight
ahead.
Set the turn signal switch to the neutral position.
NOTICE:
If it is not in the neutral position, the pin of the
turn signal switch may snap.
Install the spiral cable.
NOTICE:
...
Disassembly
1. REMOVE FRONT SEAT SIDE TABLE LEG COVER (w/
Table)
Using a screwdriver, disengage the claws and
remove the seat side table leg cover.
HINT:
Tape the screwdriver tip before use.
2. REMOVE FRONT SEAT SIDE TABLE (w/ Table)
Remove the 4 nuts and seat side table.
Rem ...
