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

FREEZE-FRAME DATA

Note. 1st trip freeze-frame data values can only be displayed with Nissan's CONSULT, and are not displayed on generic scan tool.

ECM records operating conditions such as fuel system status, calculated load value, engine coolant temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed and absolute pressure. Freeze-frame data is a "snapshot" of these operating conditions present when a fault is detected. When a fault is detected for the first time, ECM stores the 1st trip DTC, along with 1st trip freeze-frame data. Only one set of freeze-frame data can be stored in ECM (either 1st trip freeze-frame data or freeze-frame data). There is no priority for 1st trip freeze frame data. It is updated each time a different 1st trip DTC is stored. If a fault is detected for the second time, 1st trip freeze-frame data is replaced with freeze-frame data.

Freeze-frame data is updated in order of priority. See FREEZE FRAME PRIORITY IDENTIFICATION table. If a priority 1 fault (misfire or fuel injection system malfunction) is detected in another trip when priority 2 freeze-frame data is already stored in ECM, priority 2 freeze-frame data will be replaced by priority 1 freeze-frame data.

Note. Only one 1st trip DTC and one freeze-frame data "snapshot" can be stored in ECM. If using a generic scan tool, 1st trip DTC freeze-frame information may not be accessible. Use CONSULT-II to retrieve 1st trip DTC freeze-frame information.

FREEZE FRAME PRIORITY IDENTIFICATION

Using MIL

Malfunction Indicator Light (MIL) can be used for DTC retrieval and front Heated Oxygen Sensor (HO2S) monitoring. (Scheme 366) When ignition is turned on with engine off, MIL should illuminate. This is a bulb check. If MIL does not illuminate, repair MIL circuit. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. When engine is started, MIL should go off. If MIL remains on, ECM has detected a malfunction. If MIL is flashing when engine is running, ECM may be in diagnostic test mode II.

Scheme 366

Using CONSULT-II

1. If ignition is on, turn ignition off and wait at least 10 seconds. Turn ignition on. If DTC is A/T related, go to next step. If DTC is not A/T related, go to step 3 .
2. Turn CONSULT-II on and press A/T. Press SELF-DIAG RESULTS. Press ERASE. DTC in TCM is now cleared. Press BACK twice.
3. Press ENGINE. Press SELF-DIAG RESULTS. Press ERASE. DTC in ECM is now cleared.

1. Enter diagnostic test mode II. See «ENTERING DIAGNOSTIC TEST MODE II (SELF-DIAGNOSTIC RESULTS MODE)»(ref-159515-S09873173942003121500000) under RETRIEVING DIAGNOSTIC TROUBLE CODES.
2. Fully depress accelerator pedal and hold for more than 10 seconds. Fully release accelerator pedal. To confirm DTCs are cleared, ensure DTC P0000 is set.

FAIL-SAFE MODES

ECM enters a fail-safe mode if certain malfunctions are detected due to an open or short circuit. When ECM enters fail-safe mode, MIL illuminates. Refer to all diagnostic tests that apply for description and testing of circuit affected.

ECM (DTCs Not Accessible)

Maximum engine speed is 3000 RPM. Fuel injection operates in simultaneous mode. Ignition timing is fixed. Fuel pump relay remains on when engine is running and off when engine stalls. Cooling fans operate at high speed when engine is running. If ECM fail-safe mode is confirmed, replace ECM.

Work Support Mode

Note. When starting engine, CONSULT-II may display BATTERY VOLTAGE IS LOW. Charge battery, even if using charged battery.

This mode can be used for the following functions

1. FUEL PRESSURE RELEASE Use to release fuel pressure. Fuel pump will stop by touching START during engine idling. Crank a few times after engine stalls.
2. IDLE AIR VOL LEARN Use to perform idle air volume learning.
3. SELF-LEARNING CONT Use to clear the coefficient of self-learning control value. Air/fuel mixture ratio returns to the original coefficient.
4. EVAP SYSTEM CLOSE Use when testing EVAP system for leaks. This will open vacuum cut valve by-pass valve and close EVAP canister vent control valve in order to seal EVAP system under the following conditions: Ignition switch on. Engine not running. Ambient temperature is above 32°F (0°C). No vacuum and no high pressure in EVAP system. Fuel tank temperature is more than 32°F (0°C). Within 10 minutes after starting EVAP SYSTEM CLOSE. When trying to execute EVAP SYSTEM CLOSE when above conditions are not met, CONSULT-II will discontinue it and display appropriate instruction.
5. TARGET IDLE RPM ADJ Use when setting target idle speed. This function is usually unnecessary.
6. TARGET IGNITION TIMING ADJ Use when adjusting target ignition timing. After adjustment, verify target ignition timing with a timing light. This function is usually unnecessary.

Self-Diagnostic Results Mode

For DTC and 1st trip DTC descriptions, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . Freeze frame data and 1st trip freeze frame data show a snapshot of the following items at the moment a malfunction is detected.

1. FUEL SYS-B1 Or FUEL SYS-B2 Fuel injection system status for bank 1 or bank 2. One of the following modes is displayed: MODE 2: Open loop due to detected system malfunction. MODE 3: Open loop due to driving conditions (power enrichment, deceleration enrichment). MODE 4: Closed loop - using oxygen sensor(s) as feedback for fuel control. MODE 5: Open loop - has not yet satisfied condition to go into closed loop.
2. CAL/LD VALUE [%] Calculated load value.
3. COOLANT TEMP [°C] or [°F] Engine coolant temperature.
4. L-FUEL TRIM-B1 Or L-FUEL TRIM-B2 [%] Long-term fuel trim (indicates much more gradual feedback compensation to the base fuel schedule than short-term fuel trim).
5. S-FUEL TRIM-B1 Or S-FUEL TRIM-B2 [%] Short-term fuel trim (indicates dynamic or instantaneous feedback compensation to base fuel schedule) for bank 1 or bank 2.
6. ENGINE SPEED [rpm] Engine speed.
7. VHCL SPEED [km/h] or [mph] Vehicle speed.
8. B/FUEL SCHDL [msec] Base fuel schedule.
9. INT/A TEMP SE [°C] or [°F] Intake air temperature.

Data Monitor Mode

For DATA MONITOR mode descriptions, see DATA MONITOR MODE DESCRIPTIONS table.

DATA MONITOR MODE DESCRIPTIONS

Data Monitor (SPEC) Mode

For DATA MONITOR (SPEC) mode descriptions, see DATA MONITOR (SPEC) MODE DESCRIPTIONS table.

DATA MONITOR (SPEC) MODE DESCRIPTIONS

Mode 2: Freeze Frame Data

This mode gains access to emission-related data value information stored by ECM during the freeze frame portion of self-diagnostic mode during engine operation.

Mode 4: Clearing Codes

This mode can clear all emission related diagnostic information for DTCs. These include

1. Clear number of DTCs (MODE 1).
2. Clear DTCs (MODE 3).
3. Clear DTC for freeze-frame data (MODE 1).
4. Clear freeze-frame data (MODE 2).
5. Reset status of system monitoring test (MODE 1).
6. Clear on-board monitoring results (MODE 6 and 7).

Mode 6: On-Board Tests

This mode accesses the results of on-board diagnostic monitoring tests of specific components and systems that are not continuously monitored.

Mode 7: On-Board Tests

This mode enables the off-board test drive to obtain test results for emission-related powertrain components and systems that are continuously monitored during normal driving conditions.

Learning Procedure

1. Ensure accelerator pedal is fully released.
2. Turn ignition on and wait at least 2 seconds.
3. Turn ignition off and wait at least 10 seconds.
4. Turn ignition on and wait at least 2 seconds.
5. Turn ignition off and wait at least 10 seconds.

Ensure accelerator pedal is fully released. Turn ignition on. Turn ignition off and wait at least 10 seconds. Make sure that throttle valve moves during 10-second period by listening for operating sound.

NISSAN VEHICLE IMMOBILIZER SYSTEM

Nissan Vehicle Immobilizer System (NVIS) must be initialized after Engine Control Module (ECM) has been replaced. See appropriate IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

Learning Procedure With CONSULT-II

1. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-159515-S30827284102003121500000) . Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-159515-S12114059122003121500000) . Start engine and warm to normal operating temperature.
2. Ensure all conditions under «PRE-CONDITIONING»(ref-159515-S12750186622003121500000) are met. Select IDLE AIR VOL LEARN in WORK SUPPORT mode with CONSULT-II. Press START and wait 20 seconds.
3. Ensure CMPLT is displayed. Quickly increase engine speed 2 or 3 times. Ensure idle speed is 600-700 RPM and ignition timing is 10-20 degrees BTDC with transmission in Park or Neutral.
4. If INCMP is displayed, proceed as follows: Ensure throttle valve is fully closed. Check PCV valve operation. Ensure no vacuum leaks exist. If problem is found, repair as necessary. If problem is not found, it may be helpful to perform TROUBLE DIAGNOSIS - SPECIFICATION VALUE. See «TROUBLE SHOOTING - NO CODES»(ref-151937) article. If engine stalls or idle speed fluctuates, repair cause of condition and repeat procedure.

Learning Procedure Without CONSULT-II

1. Perform «ACCELERATOR PEDAL RELEASED POSITION LEARNING»(ref-159515-S30827284102003121500000). Perform «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-159515-S12114059122003121500000). Start engine and warm to normal operating temperature.
2. Ensure all conditions under «PRE-CONDITIONING»(ref-159515-S12750186622003121500000) are met. Turn ignition off and wait at least 10 seconds. Ensure accelerator pedal is fully released.
3. Turn ignition on and wait 3 seconds. Fully depress and fully release accelerator pedal quickly 5 times within 5 seconds. (Scheme 367)
4. Wait 7 seconds, then fully depress accelerator pedal and hold until MIL stays on (it will take about 20 seconds).
5. Fully release accelerator pedal within 3 seconds after MIL stays on. Start engine and let it idle. Wait 20 seconds. Quickly depress and release accelerator pedal 2 or 3 times.
6. Ensure idle speed is 600-700 RPM and ignition timing is 10-20 degrees BTDC with transmission in Park or Neutral. If idle speed and ignition timing are not as specified, result will be incomplete. Go to next step.
7. Proceed as follows: Ensure throttle valve is fully closed. Check PCV valve operation. Ensure no vacuum leaks exist. If problem is found, repair as necessary. If problem is not found, it may be helpful to perform TROUBLE DIAGNOSIS - SPECIFICATION VALUE. See «TROUBLE SHOOTING - NO CODES»(ref-151937) article. If engine stalls or idle speed fluctuates, repair cause of condition and repeat procedure.

Scheme 367

Checking SRT Code Status (Using CONSULT-II)

Select SRT STATUS in DTC CONFIRMATION mode with CONSULT-II. For items whose SRT codes are set, CMPLT is displayed. For items whose SRT codes are not set, INCMP is displayed.

Setting SRT Codes (Using CONSULT-II)

Perform DTC CONFIRMATION PROCEDURE under corresponding DTC test under DIAGNOSTIC TESTS . If more than one SRT item needs to be set, perform DTC confirmation procedures in order of priority. See SRT PRIORITY table.

SRT PRIORITY

SUMMARY

If no Diagnostic Trouble Codes (DTCs) are present and a no-start condition exists, proceed to BASIC DIAGNOSTIC PROCEDURES article. If no DTCs are present and a driveability condition exists, proceed to TROUBLE SHOOTING - NO CODES article for diagnosis by symptom (i.e., ROUGH IDLE, ENGINE STALLS, etc.).