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Home >> Nissan-Datsun >> 1997 >> Altima XE L4-2.4L (KA24DE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Monitors, Trips, Drive Cycles and Readiness Codes >> System Readiness Test (SRT) and Drive Pattern

System Readiness Test (SRT) and Drive Pattern




SYSTEM READINESS TEST (SRT) CODE
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 diagnosis has been performed two or more times. This occurs regardless of whether the diagnosis results in "OK" or "NG", and whether or not the diagnosis is performed in consecutive trips. The table above lists the four SRT items (7 diagnoses) for the ECCS used in U13 models.
Together with the DTC, the SRT code is cleared from the ECM memory using the method described later. This means that after ECCS components/system are repaired or after battery terminals remain disconnected for more than 24 hours, all SRT codes are possibly cleared from the ECM memory.

HOW TO DISPLAY SRT CODE
1. Selecting "SRT" in "SRT-OBT TEST VALUE" 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. Selecting Mode 1 with GST (Generic Scan Tool)

HOW TO SET SRT CODE
To set all SRT codes, all diagnoses 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 pattern in which SRT codes can be properly set is explained on the next page. This type of driving pattern should be performed two times or more to set all SRT codes. Self-diagnoses of "EVAP PURGE FLOW/MON", "EVAP (SMALL LEAK)" are not provided for U13 models. Using driving patterns 1 through 3 is adequate.




DRIVING PATTERNS
*1: Depress the accelerator pedal until vehicle speed is 80 km/h (50 MPH), then release the accelerator pedal. Depress the accelerator pedal until vehicle speed is 80 km/h (50 MPH) again.
*2: Operate the vehicle in the following driving pattern.




*3: The driving pattern may be omitted when EVAP (SMALL LEAK) checks are performed using the FUNCTION TEST mode of CONSULT.
- 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 temperature: 20 - 30°C (68 - 86°F)
- Diagnosis is performed as quickly as possible under normal conditions.
Under different conditions [For example: ambient temperature is 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) is 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 at least 3 times. On M/T models, shift gears following "suggested upshift speeds" schedule at right.
Pattern 4:
- Tests 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.

Suggested transmission gear position for A/T models.
Set the selector lever in the "D" position with the overdrive on-off 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.

For normal acceleration in low altitude areas [less than 1,219 m (4,000 ft)]:

Gear change / ACCEL shift point km/h (MPH) / CRUISE shift point km/h (MPH)
1st to 2nd / 24 (15) / 24 (15)
2nd to 3rd / 40 (25) / 29 (18)
3rd to 4th / 58 (36) / 48 (30)
4th to 5th / 64 (40) / 63 (39)

For quick acceleration in low altitude areas and high altitude areas [over 1,219 m (4,000 ft)]:

Gear change / km/h (MPH)
1st to 2nd / 24 (15)
2nd to 3rd / 40 (25)
3rd to 4th / 64 (40)
4th to 5th / 72 (45)

Suggested maximum speed in each gear
Downshift to a lower gear if 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, which will 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.

Gear / km/h (MPH)
1st / 50 (30)
2nd / 95 (60)
3rd / 145 (90)
4th / --
5th / --


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