DTC 0803

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 arid sends the voltage signal to the ECM. As the pressure increases, the voltage rises. The absolute pressure sensor is not used to control the engine system. It is used only for on board diagnosis.




ECM TERMINALS AND REFERENCE VALUE
Specification data are reference values and are measured between each terminal and (43) (ECCS ground).




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




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", "OVERALL FUNCTION CHECK". If there is no problem on "Procedure for malfunction B", perform "Procedure for malfunction C".

Procedure for Malfunction A
With CONSULT
(1) Turn ignition switch "ON".




(2) Select "DATA MONITOR" mode with CONSULT.
(3) Wait at least 6 seconds.

OR

With GST
(1) Turn ignition switch "ON" and wait at least 6 seconds.
(2) Select "MODE 7" with GST.

OR

NO TOOLS
(1) Turn ignition switch "ON" and wait at least 6 seconds.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results" with ECM.
If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction B", "OVERALL FUNCTION CHECK" on next page.

Procedure for Malfunction C
With CONSULT
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.




(3) Turn ignition switch "ON" and select "DATA MONITOR" mode with CONSULT.
(4) Start engine and let it idle.
(5) Wait at least 20 seconds.

OR

With GST
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.
(3) Start engine.
(4) Let engine idle and wait at least 20 seconds.
(5) Select "MODE 7" with GST.

OR

NO TOOLS
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 7 seconds.
(3) Start engine.
(4) Let engine idle and wait at least 20 seconds.
(5) Turn ignition switch "OFF".
(6) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

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

Procedure for Malfunction B
With CONSULT
(1) Turn ignition switch "ON".




(2) Select "ABSOL PRES/SE" in "DATA MONITOR" mode with CONSULT.
(3) Make sure that the voltage of "ABSOL PRES/SE" is more than 1.74 [V].

OR

With GST
(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).

OR

NO TOOLS
(1) Turn ignition switch "ON".




(2) Make sure that the voltage between ECM terminal 57 and ground is more than 1.74 [V].
If the 1st trip DTC cannot be confirmed, perform "Procedure for malfunction C" above.







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

EC-AP/SEN-01 Absolute Pressure Sensor (DTC P0105):

WIRING DIAGRAM

COMPONENT INSPECTION
Absolute Pressure Sensor
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SW/V" in "ACTIVE TEST" mode with CONSULT.
3. Check the following.




- When "MAP" is selected, "ABSOL PRES/SE" indicates approximately 1.3V.




- When "BARO" is selected, "ABSOL PRES/SE" indicates approximately 4.3V.
4. If NG, check MAP/BARO switch solenoid valve.
(1) Turn ignition switch "OFF".
(2) Remove MAP/BARO switch solenoid valve.
(3) Check air passage continuity.




Condition / Air passage continuity between (A) and (B) / Air passage continuity between (A) and (C)
12V direct current supply between terminals (1) and (2) / Yes / No
No supply / No / Yes

(4) If NG, replace MAP/BARO switch solenoid valve; if OK, go to step 5.
5. Remove absolute pressure sensor with its harness connector connected.
6. Remove hose from absolute pressure sensor.
7. Turn ignition switch "ON" and check output voltage between terminal 2 and engine ground.

The voltage should be 3.2 to 4.8 V.




8. Use pump to apply vacuum of -26.7 kPa (-200 mmHg, -7.87 inHg, -3.87 psi) to absolute pressure sensor as shown in figure 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.

9. If NG, replace absolute pressure sensor.