13A-DTC P0106: Manifold Absolute Pressure Circuit Range/Performance Problem

DTC P0106: Manifold Absolute Pressure Circuit Range/Performance Problem

TECHNICAL DESCRIPTION

Compare the actual measurement of manifold pressure by a manifold absolute pressure sensor signal with the manifold pressure estimated from a throttle position sensor (main) signal.
Compare the actual measurement of manifold pressure by a manifold absolute pressure sensor signal with the manifold pressure estimated from a throttle position sensor (sub) signal.

DESCRIPTIONS OF MONITOR METHODS

Compare load value with manifold absolute pressure sensor output voltage.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC set in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Mass airflow sensor
Engine coolant temperature sensor
Intake air temperature sensor
Barometric pressure sensor
Throttle position sensor

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

The difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (main) is more than 0 kPa (0 in.Hg).
The difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (sub) is more than 0 kPa (0 in.Hg). Or, the manifold pressure is 73 kPa (21.6 in.Hg) or less.
Engine speed is 750 r/min or higher.

Judgment Criteria

For 0.36 second, the difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (main) is more than 40 kPa (11.8 in.Hg).
For 0.36 second, the difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (sub) is more than 40 kPa (11.8 in.Hg).
For 0.36 second, the difference between the manifold pressure estimated by the throttle position sensor (main) and the manifold pressure estimated by the throttle position sensor (sub) is less than 7 kPa (2.1 in.Hg).

FAIL-SAFE AND BACKUP FUNCTION

Control as if the intake manifold vacuum pressure is 101 kPa (29.8 in.Hg).

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

Manifold absolute pressure sensor failed.
Manifold absolute pressure sensor circuit harness damage or connector damage.
ECM failed.

DIAGNOSIS

Required Special Tools:

MB992110: Power Plant ECU Check Harness
MB991348: Test Harness Set

STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 8: Manifold Absolute Pressure Sensor.

caution

To prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).

(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE)

(2) Turn on the power supply mode of the electric motor switch.

(3) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 8, Manifold Absolute Pressure Sensor.

When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).

(4) Set the vehicle to the continuous idling mode, and warm up the engine.

The standard value should be 28.3 - 41.7 kPa (8.36 - 12.31 in.Hg).
When the engine is suddenly revved, manifold absolute pressure varies.

(5) Turn off the power supply mode of the electric motor switch.

Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Go to Step 2.

STEP 2. Measure the sensor output voltage at manifold absolute pressure sensor connector.

(1) Disconnect the manifold absolute pressure sensor connector and connect the test harness set special tool (MB991348) between the separated connectors.

(2) Turn on the power supply mode of the electric motor switch.

(3) Measure the voltage between terminal MAP and ground.

When altitude is 0 m (0 foot), voltage should be between 3.8 and 4.2 volts.
When altitude is 600 m (1,969 feet), voltage should be between 3.5 and 3.9 volts.
When altitude is 1,200 m (3,937 feet), voltage should be between 3.3 and 3.7 volts.
When altitude is 1,800 m (5,906 feet), voltage should be between 3.0 and 3.4 volts.

(4) Turn off the power supply mode of the electric motor switch.

Is the measured voltage normal?

Go to Step 7.

Go to Step 3.

STEP 3. Measure the sensor supply voltage at manifold absolute pressure sensor connector.

(1) Disconnect the manifold absolute pressure sensor connector and connect the test harness set special tool (MB991348) between the separated connectors.

(2) Turn on the power supply mode of the electric motor switch.

(3) Measure the voltage between terminal MAP5 and ground by backprobing.

Voltage should be between 4.9 and 5.1 volts.

(4) Turn off the power supply mode of the electric motor switch.

Is the measured voltage between 4.9 and 5.1 volts?

Go to Step 5.

Go to Step 4.

STEP 4. Check of harness damage in MAP5 line between manifold absolute pressure sensor connector and ECM connector.

Is the harness wire in good condition?

Go to Step 8.

Repair the connector(s) or wiring harness. Then go to Step 9.

STEP 5. Measure the ground voltage at manifold absolute pressure sensor connector.

(1) Disconnect the manifold absolute pressure sensor connector and connect the test harness set special tool (MB991348) between the separated connectors.

(2) Turn on the power supply mode of the electric motor switch.

(3) Measure the voltage between terminal MAPE and ground by backprobing.

Voltage should be 0.5 volt or less.

(4) Turn off the power supply mode of the electric motor switch.

Is the measured voltage 0.5 volt or less?

Replace the manifold absolute pressure sensor. Then go to Step 9.

Go to Step 6.

STEP 6. Check of harness damage in MAPE line between manifold absolute pressure sensor connector and ECM connector.

Is the harness wire in good condition?

Go to Step 8.

Repair the connector(s) or wiring harness. Then go to Step 9.

STEP 7. Measure the sensor output voltage at ECM connector by using power plant ECU check harness special tool MB992110.

(1) Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors.

(2) Turn on the power supply mode of the electric motor switch.

(3) Measure the voltage between terminal MAP and ground.

When altitude is 0 m (0 foot), voltage should be between 3.8 and 4.2 volts.
When altitude is 600 m (1,969 feet), voltage should be between 3.5 and 3.9 volts.
When altitude is 1,200 m (3,937 feet), voltage should be between 3.3 and 3.7 volts.
When altitude is 1,800 m (5,906 feet), voltage should be between 3.0 and 3.4 volts.

(4) Turn off the power supply mode of the electric motor switch.

Is the measured voltage normal?

Go to Step 8.

Repair or replace the connector(s), or check and repair the harness of damage in MAP line between manifold absolute pressure sensor connector and ECM connector. Then go to Step 9.

STEP 8. Using scan tool (M.U.T.-IIISE), check data list item 8: Manifold Absolute Pressure Sensor.

(1) Turn on the power supply mode of the electric motor switch.

(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 8, Manifold Absolute Pressure Sensor.

When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).
When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).
When altitude is 1,200 m (3,937 feet), 88 kPa (26.0 in.Hg).
When altitude is 1,800 m (5,906 feet), 81 kPa (23.9 in.Hg).

(3) Set the vehicle to the continuous idling mode, and warm up the engine.

The standard value should be 28.3 - 41.7 kPa (8.36 - 12.31 in.Hg).
When the engine is suddenly revved, manifold absolute pressure varies.

(4) Turn off the power supply mode of the electric motor switch.

Is the sensor operating properly?

It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions

Replace the ECM (Refer to Removal and Installation

). Then go to Step 9.

STEP 9. Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1

(2) Check the diagnostic trouble code (DTC).

Is DTC P0106 set?

Retry the troubleshooting.

The inspection is complete.