Toyota Sienna Service Manual: Freeze frame data
1. DESCRIPTION
(a) The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
HINT:
If it is impossible to duplicate the problem even though a DTC is detected, confirm the freeze frame data.
(b) The ECM records engine conditions in the form of freeze frame data every 0.5 seconds. Using the intelligent tester, five separate sets of freeze frame data, including the data values at the time when the DTC was set, can be checked.
- 3 data sets before the DTC was set
- 1 data set when the DTC was set
- 1 data set after the DTC was set
These data sets can be used to simulate the condition of the vehicle around the time of the occurrence of the malfunction. The data may assist in identifying of the cause of the malfunction, and in judging whether it was temporary or not.
2. LIST OF FREEZE FRAME DATA
Dtc check / clear
Notice:All the stored dtcs and freeze frame data are
erased if:
1) the ecm is changed from normal mode to check mode
or vice versa; or 2) the ignition switch is turned from on
to a ...
Check mode procedure
HINT:
Intelligent tester only:
Compared to normal mode, check mode is more sensitive to
malfunctions. Therefore, check mode can detect the
malfunctions that cannot be detected by normal mode.
...
Other materials:
Problem symptoms table
HINT:
Proceed to the troubleshooting for each circuit in the table
below.
Occupant Classification System
Symptom
Suspected area
The front passenger seat condition differs from the
indication by the passenger airbag ON/OFF indicator
(DTC is not output).
Trouble ...
Initialization
1. ZERO POINT CALIBRATION
NOTICE:
Make sure that the front passenger seat is not
occupied before performing the operation.
HINT:
Perform the zero point calibration and sensitivity check if
any of the following conditions occur.
The occupant classification ECU is replaced.
Acc ...
Terminals of ecu
1. A/C AMPLIFIER
(a) Waveform 1:
(b) Waveform 2:
(c) Waveform 3: ...
