Engine Controls - Basic Diagnostic Procedures - Titan: Overview Nissan Titan 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 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 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.

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 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.

With CONSULT-II

Scheme 914

Scheme 915

Scheme 916

Scheme 917

1. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-169712-S24333390702004121500000) .
2. Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-169712-S39661707712004121500000) .
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic «PREPARATION»(ref-169712-S42224978222004121500000) are in good order.
5. Select "IDLE AIR VOL LEARN" in "WORK SUPPORT" mode.
6. Touch "START" and wait 20 seconds.
7. Make sure that "CMPLT" is displayed on CONSULT-II screen. If "CMPLT" is not displayed, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the «DIAGNOSTIC PROCEDURE»(ref-169712-S06433798562004121500000) .
8. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.

Without CONSULT-II

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.

Scheme 918

1. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-169712-S24333390702004121500000).
2. Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-169712-S39661707712004121500000).
3. Start engine and warm it up to normal operating temperature.
4. Check that all items listed under the topic «PREPARATION»(ref-169712-S42224978222004121500000) 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.
8. Fully depress the accelerator pedal.
9. Fully release the accelerator pedal.
10. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
11. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
12. Start engine and let it idle.
13. Wait 20 seconds.
14. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications. (Scheme 916)
15. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the «DIAGNOSTIC PROCEDURE»(ref-169712-S06433798562004121500000).

If idle air volume learning cannot be performed successfully, proceed as follows

1. Check that throttle valve is fully closed.
2. Check PCV valve operation.
3. Check that downstream of throttle valve is free from air leakage.
4. When the above three items check out OK, engine component parts and their installation condition are questionable. Check and eliminate the cause of the incident. It is useful to perform «TROUBLE DIAGNOSIS - SPECIFICATION VALUE»(ref-169472-S00985612472004120900000) in ENGINE CONTROL SYSTEM - TITAN article in ENGINE PERFORMANCE.
5. If any of the following conditions occur after the engine has started, eliminate the cause of the incident and perform Idle air volume learning all over again: Engine stalls. Erroneous idle.