P0105
COMPONENT DESCRIPTION
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.
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal and (25) (ECCS ground) with a voltmeter.
ON BOARD DIAGNOSIS LOGIC
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
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 5 seconds.
(3) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.
If the 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 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 20 seconds.
OR
With GST
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 5 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 5 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 (61) and ground is more than 1.74 [V].
It the DTC cannot be confirmed, perform "Procedure for malfunction C".
EC-AP/SEN-01 Absolute Pressure Sensor (DTC: P0105):
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".
Procedure A
Procedure B
COMPONENT INSPECTION
Absolute pressure sensor
With Consult
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SWN" in "ACTIVE TEST" mode with CONSULT
3. Make sure of the following.
- When selecting "MAP", "ABSOL PRES/SE" indicates approximately 1 .3V.
- When selecting "BARO", "ABSOL PR ES/SE" indicates approximately 4.3V.
4. If NG, check "Without Consult".
OR
Without Consult
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.
Pressure (Absolute pressure) / Voltage (V)
1066 kPa (800 mmHg, 31.50 inHg) / Approximately 4.6
13.3 kpa (100 mmHg, 3.94 inHg) / Approximately 0.5
CAUTION: Always calibrate the vacuum pump gauge when using it.
5. If NG, replace absolute pressure sensor.
If OK, check MAP/BARO switch solenoid valve below.
MAP/BARO Switch Solenoid Valve
1. Remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. If NG, check "Absolute pressure sensor" above.