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Home >> Nissan-Datsun >> 1999 >> Maxima GXE V6-3.0L (VQ30DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Engine Control System >> With CONSULT - Screen Terms >> ABSOL PRES/SE

ABSOL PRES/SE







COMPONENT DESCRIPTION
The absolute pressure sensor is connected to the MAP/BARO switch solenoid valve by a hose The sensor detects ambient barometric pressure and intake manifold pressure respectively, and modifies the voltage signal received from the ECM. The modified signal will then be returned to the ECM. As the pressure increases, the voltage rises.




CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Specification data are reference values.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values, and are measured between each terminal and (25) (ECM ground).




ON BOARD DIAGNOSIS LOGIC

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction B". If the 1st trip DTC is not confirmed on "Procedure for malfunction B", perform "Procedure for malfunction C".

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 10 seconds before conducting the next test.




Procedure for malfunction A

With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.
3. Wait at least 10 seconds.
4. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tools
1. Turn ignition switch "ON" and wait at least 10 seconds.
2. Select "MODE 7" with GST.
3. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

Without Scan Tools
1. Turn ignition switch "ON" and wait at least 10 seconds.
2. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
3. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
4. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".




Procedure for malfunction B

With Consult
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
4. Start engine and let it idle.
5. Wait at least 15 seconds.
6. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

With Generic Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Start engine.
4. Let engine idle and wait at least 15 seconds.
5. Select "MODE 7" with GST.
6. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR

Without Scan Tools
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 10 seconds.
3. Start engine.
4. Let engine idle and wait at least 15 seconds.
5. Turn ignition switch "OFF", wait at least 10 seconds and then turn "ON".
6. Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
7. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".







Procedure for malfunction C

CAUTION: Always drive vehicle at a safe speed.

With Consult
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT.
The voltage of "ABSOL PRES/SE" should be more than 1.74[V].
If the check result is NG, go to "DIAGNOSTIC PROCEDURE".
If the check result is OK, go to following step.
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch "OFF" and wait at least 10 seconds
5. Start engine and let it idle for at least 15 seconds
6. Select "DATA MONITOR" mode with CONSULT
7. Drive the vehicle at least 3 consecutive seconds under the following conditions,
B/FUEL SCHDL: More than 5.2 ms
CKPS RPM (POS): 3,000 - 4,800 rpm
Selector lever: Suitable position
Driving location: Driving vehicle uphill (Increased engine load) will help maintain the driving conditions required for this test.
8. If 1st trip DTC is detected, go to "DIAGNOSTIC PROCEDURE".

OR




OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the front heated oxygen sensor circuit. During this check, a 1st trip DTC might not be confirmed.

Procedure for malfunction C

With Generic Scan Tools
1. Turn ignition switch "ON".
2. Select "MAP" in "MODE 1" with GST.
3. Make sure that the pressure of "MAP" is more than 46 kPa (0.47 kg/sq.cm, 6.7 psi).
4. If NG, go to "DIAGNOSTIC PROCEDURE".

OR




Without Scan Tools
1. Turn ignition switch "ON".
2. Make sure that the voltage between ECM terminal (61) and engine ground is more than 1.74 [V].
3. If NG, go to "DIAGNOSTIC PROCEDURE".







WIRING DIAGRAM

DIAGNOSTIC PROCEDURE
If the trouble is duplicated after "Procedure for malfunction A or B", perform "Procedure A". If the trouble is duplicated after "Procedure for malfunction C", perform "Procedure B".

Part 1 Of 2:




Part 2 Of 2:




Procedure A




Procedure B




COMPONENT INSPECTION

Absolute pressure sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.
3. Turn ignition switch "ON".
4. Apply vacuum and barometric pressure to absolute pressure sensor as shown.




5. Check output voltage between ECM terminal (61) and ground.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do riot apply pressure below -93.3 kPa (-700 mmHg,-27.56 inHg) and over 101.3 kPa (760 mmHg, 29.92 inHg).

6. If NG, replace absolute pressure sensor.
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