Toyota Sienna Service Manual: Terminals of ECU
1. CHECK TRANSPONDER KEY AMPLIFIER
- Disconnect the I14 amplifier connector and measure the resistance between the terminal of the wire harness side connector and body ground.
If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the I14 amplifier connector and measure the resistance and voltage of each terminal of the connector
If the result is not as specified, the amplifier may have a malfunction.
- Inspect using an oscilloscope.
- Waveform 1 (Reference):
- Waveform 2 (Reference):
2. CHECK TRANSPONDER KEY ECU ASSEMBLY
- Disconnect the T6 ECU connector and measure the resistance and voltage between each terminal of the wire harness side connector
If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the T9 ECU connector and measure the voltage of each terminal of the connector.
If the result is not as specified, the ECU may have a malfunction.
- Inspect using an oscilloscope.
- Wave form 1 (Reference):
- Wave form 2 (Reference):
- Wave form 3 (Reference):
- Wave form 4 (Reference):
3. CHECK ECM
- Disconnect the E11 ECM connector and measure the resistance between the terminal of the wire harness side connector and body ground.
If the result is not as specified, there may be a malfunction on the wire harness side.
- Reconnect the E11 ECM. Measure the voltage between each terminal of the connector according to the value(s) in the table below.
If the result is not as specified, there may be a malfunction on the wire harness side.
- Inspect using an oscilloscope.
- Waveform 1 (Reference):
- Waveform 2 (Reference):
Problem symptoms table
ENGINE IMMOBILISER SYSTEM
...
Diagnosis system
1. CHECK DLC3
The vehicle's ECU uses ISO 15765-4 for
communication protocol. The terminal arrangement
of the DLC3 complies with SAE J1962 and matches
the ISO 15765-4 format.
...
Other materials:
Brake Switch
DESCRIPTION
The stop light switch is a duplex system that transmits two signals: STP and
ST1-. These two signals are
used by the ECM to monitor whether or not the brake system is working properly.
If the signals, which
indicate the brake pedal is being depressed or released, are detected ...
Low Battery Positive Voltage
DTC C1241/41 Low Battery Positive Voltage
DESCRIPTION
If there is a problem with the brake actuator assembly (skid control ECU)
power supply circuit, the skid
control ECU outputs the DTC and prohibits the ABS operation with the fail safe
function.
If the voltage supplied to the IG1 termina ...
Open in Front Pretensioner Squib LH Circuit
DTC B0136/74 Open in Front Pretensioner Squib LH Circuit
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor
assembly and the front seat
outer belt assembly LH.
This circuit instructs the SRS to deploy when deployment conditions are met.
DTC B0136/74 i ...
