System Readiness Test (SRT) and Drive Pattern

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.
Inspection/Maintenance (I/M) tests of the on board diagnostic (OBD) II system may become the legal requirements in some states/areas. All SRT codes must be set in this case. Unless all SRT codes are set, conducting the I/M test may not be allowed.
SRT codes are set after self-diagnosis has been performed two 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 four SRT items (7 test items) for the ECCS engine management system used in this model.

SRT Items / Self-Diagnostic Test Items
Catalyst monitoring
- Three way catalyst function P0420 (0720)
Oxygen sensor monitoring
- Front heated oxygen sensor P0130 (0503)
- Rear heated oxygen sensor P0136 (0707)
Oxygen sensor heater monitoring
- Front heated oxygen sensor heater P0135 (0901)
- Rear heated oxygen sensor heater P0141 (0902)
EGR system monitoring
- EGR function P0400 (0302)
- EGRC-BPT valve function P0402 (0306)

Together with the DTC, the SRT code is cleared from the ECM memory using the methods described in "How to Clear Diagnostic Trouble Codes". 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
Selecting "SRT" in "SRT OBD TEST VALUE" mode with CONSULT.




A sample of CONSULT display for SRT code is shown above. "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 two or more times. Each diagnosis may require a long period of actual driving under various conditions. The most efficient driving patterns in which SRT codes can be properly set are explained in the charts shown below. The driving patterns should be performed two times or more to set all SRT codes. Self-diagnoses of "EVAP PURGE FLOW/MON" and "EVAP (SMALL LEAK)" are not provided for Quest models. Use driving patterns 1 through 3 for these items.

Driving Pattern:

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 (51) and (50) 3.0 - 4.3V).
- 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 (51) and (50) is lower than 1.4V).
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 as shown below.
Pattern 4:
- Teats are performed after the engine has been operated for at least 12 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.
(1) Turn ignition switch "OFF" and wait 5 seconds.
(2) Start engine and repeat driving pattern shown below at least 10 times.
- During acceleration, hold the accelerator pedal as steady as possible. The "THRTL POS SEN" value of CONSULT should be between 0.8 to 1.2V.
(3) Repeat step 1) and 2) until the EGR system SRT is set.




3: The driving pattern may be omitted when EVAP (SMALL LEAK) checks are performed using the FUNCTION TEST mode of CONSULT.
4: Checking the vehicle speed with CONSULT or GST is advised.

Suggested transmission gear position for A/T models.
Set the selector lever in the "D" position with the overdrive switch turned ON.