Engine Controls - Self-Diagnostics - 350Z: Overview Nissan 350Z I

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 (APP) sensor output signal. It must be performed each time harness connector of APP sensor or ECM is disconnected.

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 electronic throttle control actuator harness connector or ECM harness connector is disconnected.

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

1. Each time electric throttle control actuator or ECM is replaced.
2. Idle speed or ignition timing is out of specification.

Pre-Conditioning

Before proceeding, ensure the following conditions are met

1. Battery voltage: more than 12.9 volts at idle.
2. Engine coolant temperature: 158-210°F (70-99°C).
3. Transmission: Park or Neutral.
4. A/C, headlights, rear window defogger: off.
5. Headlight switch: 1st position (only on vehicles with daytime running lights).
6. Steering wheel: straight-ahead position.
7. Vehicle speed: stopped.
8. Transmission: warmed up. If using CONSULT-II on A/T-equipped vehicle, confirm FLUID TEMP SE in DATA MONITOR mode of A/T system indicates less than .9 volt. If not using CONSULT-II on A/T-equipped vehicle, drive vehicle for 10 minutes to warm up transmission.

As part of an enhanced emissions test for inspection and maintenance, certain states require the status of System Readiness Test (SRT) be used to indicate whether the ECM has completed the self-diagnosis of major emission systems and components. Completion must be verified in order for the emissions inspection to proceed.

If a vehicle is rejected for a state emissions inspection due to one or more SRT items indicating INCMP, use this information to set the SRT to CMPLT.

In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT status will indicate CMPLT for each application system. Once set as CMPLT, the SRT status remains CMPLT until the self-diagnosis memory is erased.

Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer's normal driving pattern. The SRT will indicate INCMP for these items.

See also:
• ON-VEHICLE ADJUSTMENTS
• PIN VOLTAGE CHARTS