Code 0803

The absolute pressure sensor is connected to the MAP/BARO switch solenoid valve with a duct. 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. The absolute pressure sensor is not directly used to control the engine system. It is used only for on-board diagnosis.




DIAGNOSTIC CHART PROCEDURE A




DIAGNOSTIC CHART PROCEDURE B




DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
Perform "Procedure for malfunction A" first. If the DTC cannot be confirmed, perform "OVERALL FUNCTION CHECK", "Procedure for malfunction B". If there is no problem on "Procedure for malfunction B", perform "Procedure for malfunction C".

Procedure for malfunction A
CONSULT
1) Turn ignition switch "ON".
2) Select "DATA MONITOR" mode with CONSULT.
3) Wait for at least 6 seconds.

OR

GST
1) Turn ignition switch "ON" and wait for at least 6 seconds.
2) Select "MODE 3" with GST.

OR

NO TOOLS
1) Turn ignition switch "ON" and wait for at least 6 seconds.
2) Turn ignition switch "OFF" and wait for at least 5 seconds.
3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

Procedure for malfunction C
CONSULT
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait for 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 for at least 15 seconds.

OR

GST
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait for at least 5 seconds.
3) Start engine.
4) Let engine idle and wait for at least 15 seconds.
5) Select "MODE 3", with GST.

OR

NO TOOLS
1) Start engine and warm it up sufficiently.
2) Turn ignition switch "OFF" and wait for at least 5 seconds.
3) Start engine.
4) Let engine idle and wait for at least 15 seconds.
5) Turn ignition switch "OFF".
6) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of absolute pressure sensor circuit. During this check, a DTC might not be confirmed.

Procedure for malfunction B
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

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/cm2, 6.7 psi).

OR

NO TOOLS
1) Turn ignition switch "ON".




2) Make sure that the voltage between ECM terminal (61) and ground is more than 1.74 (V).

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. Apply vacuum and pressure to absolute pressure sensor as shown in figure.




4. Check output voltage between terminal (2) and engine ground.
5. If NG, replace absolute pressure sensor.




WIRING DIAGRAM