Nissan Reset Ecu.pdf

Nissan Service Manual (2003 350Z)

Section EC (Engine Control System)

Basic Service Procedure

Accelerator Pedal Released Position Learning

DESCRIPTION

“Accelerator Pedal Released Position Learning” is an operation to learn the fully released

position of the accelerator pedal by monitoring the accelerator pedal position sensor output

signal. It must be performed each time harness connector of accelerator pedal position

sensor or ECM is disconnected.

OPERATION PROCEDURE

1. Make sure that accelerator pedal is fully released.

2. Turn ignition switch “ON” and wait at least 2 seconds.

3. Turn ignition switch “OFF” wait at least 10 seconds.

4. Turn ignition switch “ON” and wait at least 2 seconds.

5. Turn ignition switch “OFF” wait at least 10 seconds.

Throttle Valve Closed Position Learning

DESCRIPTION

“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of

the throttle valve by monitoring the throttle position sensor output signal. It must be

performed each time harness connector of electric throttle control actuator or ECM is

disconnected.

OPERATION PROCEDURE

1. Make sure that accelerator pedal is fully released.

2. Turn ignition switch “ON”.

3. Turn ignition switch “OFF” wait at least 10 seconds.

(Make sure that throttle valve moves during above 10 seconds by confirming the operating

sound.)

Idle Air Volume Learning

DESCRIPTION

“Idle Air Volume Learning” is an operation to learn the idle air volume that keeps each engine

within the specific range. It must be performed under any of the following conditions:

• Each time electric throttle control actuator or ECM is replaced.

• Idle speed or ignition timing is out of specification.

•

PREPARATION

Before performing “Idle Air Volume Learning”, make sure that all of the following conditions

are satisfied. Learning will be cancelled if any of the following conditions are missed for even

a moment.

• Battery voltage: More than 12.9V (At idle)

• Engine coolant temperature: 70 - 100 ° C (158 - 212 ° F)

• PNPswitch:ON

• Electric load switch: OFF (Air conditioner, headlamp, rear window defogger)

• Steering wheel: Neutral (Straight-ahead position)

• Vehicle speed: Stopped

• Transmission:Warmed-up

For models with CONSULT-II, drive vehicle until “FLUID TEMP SE” in “DATA MONITOR”

mode of “A/T” system indicates less than 0.9V. For models without CONSULT-II, drive

vehicle for 10 minutes.

OPERATION PROCEDURE

NOTE:

• It is better to count the time accurately with a clock.

• It is impossible to switch the diagnostic mode when an accelerator pedal

position sensor circuit has a malfunction.

•

1. Perform "Accelerator Pedal Released Position Learning" procedure.

2. Perform "Throttle Valve Closed Position Learning" procedure.

3. Start engine and warm it up to normal operating temperature.

4. Check that all items listed under the topic “PREPARATION” are in good order.

5. Turn ignition switch “OFF” and wait at least 10 seconds.

6. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3

seconds.

7. Repeat the following procedure quickly five times within 5 seconds.

a. Fully depress the accelerator pedal.

b. Fully release the accelerator pedal.

8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds

until the MIL stops blinking and turned ON.

9. Fully release the accelerator pedal within 3 seconds after the MIL goes off.

10. Start engine and let it idle.

11. Wait 20 seconds.

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