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Home >> Nissan-Datsun >> 1999 >> Altima XE L4-2.4L (KA24DE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Engine Control System >> With CONSULT - Screen Terms >> ABSL PRES SEN/CIRC

ABSL PRES SEN/CIRC







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 and sends the voltage signal to the ECM. As the pressure increases, the voltage rises.




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".

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 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 6 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 6 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 6 seconds.
2. Turn ignition switch "OFF", wait at least 5 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 5 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 Tool
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch "OFF" and wait at least 5 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 5 seconds.
3. Start engine.
4. Let engine idle and wait at least 15 seconds.
5. Turn ignition switch "OFF", wait at least 5 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 5 seconds.
5. Start engine and let it idle for at least 13 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 4.6 ms
CMPS-RPM (REF): 3,000 - 4,800 rpm
Selector lever: Suitable position
Driving pattern: 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

0VERALL 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/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 (66) and 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 C", perform "Procedure A" below. If the trouble is duplicated after "Procedure for malfunction B", perform "Procedure B".







Procedure A




Procedure B




COMPONENT INSPECTION
1. Remove absolute pressure sensor with its harness connector connected.
2. Remove hose from absolute pressure sensor.
3. Turn ignition switch "ON" and check output voltage between ECM terminal (66) and engine ground.
The voltage should be 3.2 to 4.8 V.
4. Use pump to apply vacuum of -26.7 kPa (-200 mmHg, -7.87 in Hg) to absolute pressure sensor as shown in image and check the output voltage.
The voltage should be 1.0 to 1.4 V lower than the value measured in step 3.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply vacuum below -93.3 kPa (-700 mmHg, -27.56 in Hg) or pressure over 101.3 kPa (760 mmHg, 29.92 in Hg).

5. If NG, replace absolute pressure sensor.
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