Nissan Frontier D40. Manual - part 559

ECM

EC-927

< ECU DIAGNOSIS >

[VQ40DE]

• When any SRT codes are not set, MIL will blink periodically for 10 seconds.

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.

WITH CONSULT-III

Perform corresponding DTC Confirmation Procedure one by one based on Performance Priority in the table
on "SRT Item".

WITHOUT CONSULT-III

The most efficient driving pattern in which SRT codes can be properly set is explained on the next page. The
driving pattern should be performed one or more times to set all SRT codes.

JMBIA1515GB

EC-928

< ECU DIAGNOSIS >

[VQ40DE]

ECM

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 short-
est.
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:

JSBIA0162GB

ECM

EC-929

< ECU DIAGNOSIS >

[VQ40DE]

• Sea level
• Flat road
• Ambient air temperature: 20 - 30

C (68 - 86

• 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)], diagno-

sis may also be performed.

Pattern 1:
• The engine is started at the engine coolant temperature of

−

10 to 35

C (14 to 95

(where the voltage between the ECM terminal 73 and ground is 3.0 - 4.3V).

• The engine must be operated at idle speed until the engine coolant temperature is greater than 70

(158

F) (where the voltage between the ECM terminal 73 and ground is lower than 1.4V).

• The engine is started at the fuel tank temperature of warmer than 0

C (32

F) (where the voltage

between the ECM terminal 107 and ground is less than 4.1V).

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:
• Operate vehicle following the driving pattern shown in the figure.
• Replace the accelerator pedal during decelerating vehicle speed

from 90km/h (56MPH) to 0km/h (0MPH).

Pattern 4:
• Operate vehicle, following the driving pattern shown in the figure.
- Drive the vehicle in a proper gear at 60 km/h (38 MPH) and main-

tain the speed.

- Release the accelerator pedal fully at least 5 seconds.
- Repeat the above two steps at least 5 times.

Pattern 5:
• 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: Checking the vehicle speed with 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.
Suggested Upshift Speeds for M/T Models
Shown below are suggested vehicle speeds 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.

PBIB2244E

JSBIA0160GB

EC-930

< ECU DIAGNOSIS >

[VQ40DE]

ECM

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 high-
est gear suggested for that speed. Always observe posted speed limits and drive according to the road condi-
tions to ensure sage operation. Do not over-rev the engine when shifting to a lower gear as it may cause
engine damage or loss of vehicle control.

PERMANENT DIAGNOSTIC TROUBLE CODE (PERMANENT DTC)

Permanent DTC is defined in SAE J1979/ISO 15031-5 Service $0A.
ECM stores a DTC issuing a command of turning on MIL as a permanent DTC and keeps storing the DTC as
a permanent DTC until ECM judges that there is no presence of malfunction.
Permanent DTCs cannot be erased by using the Erase function of CONSULT-III or Generic Scan Tool (GST)
and by disconnecting the battery to shut off power to ECM. This prevents a vehicle from passing the state
emission inspection without repairing a malfunctioning part.
When not passing the state emission inspection due to more than one permanent DTC, permanent DTCs
should be erased, referring to this manual.
NOTE:
• The important items in state emission inspection are that MIL is not ON, SRT test items are set, and perma-

nent DTCs are not included.

• Permanent DTCs do not apply for regions that permanent DTCs are not regulated by law.

Permanent DTC Item

For permanent DTC items, MIL turns ON. Refer to

EC-922, "Emission-related Diagnostic Information"

, “EMIS-

SION-RELATED DIAGNOSTIC INFORMATION ITEMS”.

Permanent DTC Set Timing

The setting timing of permanent DTC is stored in ECM with the lighting of MIL when a DTC is confirmed.

Permanent DTC Service Procedure

For normal acceleration in altitude areas

[less than 1,219 m (4,000 ft)]:

For quick acceleration in low altitude

areas and high altitude areas

[over 1,219 m (4,000 ft)]:

Gear change

ACCEL shift point km/h (MPH)

CRUISE shift point km/h (MPH)

km/h (MPH)

1st to 2nd

21 (13)

17 (11)

24 (15)

2nd to 3rd

38 (24)

27 (17)

40 (25)

3rd to 4th

53 (33)

40 (25)

64 (40)

4th to 5th

69 (43)

51 (32)

72 (45)

6th

77 (48)

72 (45)

80 (50)

Gear

km/h (MPH)

1st

56 (35)

2nd

96 (60)

3rd

136 (85)

4th

—

5th

—

6th

—

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