System Readiness Test (SRT), Drive Pattern and Test Value and Limits (GST)

SYSTEM READINESS TEST (SRT) CODE
System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979. It indicates whether the self-diagnostic tests for non-continuously monitored items have been completed or not.
SRT codes are set after self-diagnosis has been performed one or more times. This occurs regardless of whether the diagnosis is in "OK" or "NG" and whether or not the diagnosis is performed in consecutive trips. The following table lists the 5 SRT items (30 test items) for the ECCS used in R50 models.








Together with the DTC, the SRT code is cleared from the ECM memory using the method described later. In addition, after ECCS components/system are repaired or if the battery terminals remain disconnected for more than 24 hours, all SRT codes may be cleared from the ECM memory.





How to Display SRT Code
1. With CONSULT.
Selecting "SRT STATUS" in "DTC CONFIRMATION" mode with CONSULT.
For items whose SRT codes are set, a "CMPLT" is displayed on the CONSULT screen; for items whose SRT codes are not set, "INCMP" is displayed.
2. With GST
Selecting Mode 1 with GST (Generic Scan Tool)
A sample of CONSULT display for SRT code is shown below.
"INCMP" means the self-diagnosis is incomplete and SRT is not set. "CMPLT" means the self-diagnosis is complete and SRT is set.

How to Set SRT Code
To set all SRT codes, self-diagnosis for the items indicated above must be performed one or more times. Each diagnosis may require a long period of actual driving under various conditions. The most efficient driving pattern in which SRT codes can be properly set is explained in Driving Pattern.
The driving pattern should be performed one or more times to set all SRT codes.


Driving Pattern




The time required for each diagnosis varies with road surface conditions, weather, altitude, individual driving habits, etc.
- Zone A refers to the range where the time required, for the diagnosis under normal conditions, is the shortest.
- Zone B refers to the range where the diagnosis can still be performed if the diagnosis is not completed within zone A.

*: Normal conditions refer to the following:
- Sea level
- Flat road
- Ambient air temperature: 20 - 30°C (68 - 86°F)

- Diagnosis is performed as quickly as possible under normal conditions.
- Under different conditions [For example: ambient air temperature other than 20 - 30°C (68 - 86°F)], diagnosis may also be performed.

Pattern 1:
- The engine is started at the engine coolant temperature of -10 to 35°C (14 to 95°F) (where the voltage between the ECM terminals 59 and 43 is 3.0 - 4.3 V).
- The engine must be operated at idle speed until the engine coolant temperature is greater than 70°C (158°F) (where the voltage between the ECM terminals 59 and 43 is lower than 1.4 V).
- The engine is started at the tank fuel temperature of warmer than 0°C (32°F) (where the voltage between the ECM terminal 60 and ground is less than 4.1 V).

Pattern 2:
- When steady-state driving is performed again even after it is interrupted, each diagnosis can be conducted. In this case, the time required for diagnosis may be extended.

Pattern 3:
- The driving pattern outlined in 2 must be repeated at least 3 times.
On M/T models, shift gears following "suggested upshift speeds" schedule below.

Pattern 4:
- Tests are performed after the engine has been operated for at least 17 minutes.
- The accelerator pedal must be held very steady during steady-state driving.
- If the accelerator pedal is moved, the test must be conducted all over again.
1: Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH), then release the accelerator pedal and keep it released for more than 10 seconds. Depress the accelerator pedal until vehicle speed is 90 km/h (56 MPH) again.
2: Operate the vehicle in the following driving pattern.
(a) Decelerate vehicle to 0 km/h and let engine idle.





(b) Repeat driving pattern shown above at least 10 times.
During acceleration, hold the accelerator pedal as steady as possible. (The THROTLLE POS SEN value of CONSULT should be between 0.8 to 1.2 V.)
(c) Repeat steps 1 and 2 until the EGR system SRT is set.

3: Checking the vehicle speed with CONSULT or GST is advised.
4: The driving pattern may be omitted when "PURG FLOW P1447" is performed using the "DTC WORK SUPPORT" mode with CONSULT.
5: The driving pattern may be omitted when "EVAP SML LEAK P0440" is performed using the "DTC WORK SUPPORT" mode with CONSULT.
6: The driving pattern may be omitted when all the following are performed using the "DTC WORK SUPPORT" mode with CONSULT.
- "EGR SYSTEM P0400"
- "EGR SYSTEM P1402"

7: The driving pattern may be omitted when "EGRC-BPT/VLV P0402" is performed using the "DTC WORK SUPPORT" mode with CONSULT.


Suggested Transmission Gear Position for A/T Models
Set the selector lever in the "D" position with the overdrive switch turned ON.


Suggested upshift speeds for M/T models



Shown below are suggested vehicle speeds for shifting into a higher gear. These suggestions relate to fuel economy and vehicle performance. Actual upshift speeds will vary according to road conditions, the weather and individual driving habits.


Suggested Maximum Speed in Each Gear



Downshift to a lower gear it the engine is not running smoothly or if you need to accelerate.
Do not exceed the maximum suggested speed (shown below) in any gear. For level road driving, use the highest gear suggested for that speed.
Always observe posted speed limits and drive according to the road conditions to ensure safe operation.
Do not over-rev the engine when shifting to a lower gear as it may cause engine damage or loss of vehicle control.


Test Value and Test Limit (Generic Scan Tool Only)
The following is the information specified in Mode 6 of SAE J1979.
The test value is a parameter used to determine whether a system/circuit diagnostic test is "OK" or "NG" while being monitored by the ECM during self-diagnosis. The test limit is a reference value which is specified as the maximum or minimum value and is compared with the test value being monitored.
Items for which these data (test value and test limit) are displayed are the same as SRT code items (30 test items).








These data (test value and test limit) are specified by Test ID (TID) and Component ID (CID) and can be displayed on the GST screen.