Code No. P0107: Manifold Absolute Pressure Sensor Circuit Low Input

OPERATION

A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 3) from the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 97) and earthed to the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 96) from the manifold absolute pressure sensor (terminal No. 2).
The sensor signal is inputted to the engine-ECU <M/T> or engine-A/T-ECU <A/T> (terminal No. 101) from the manifold absolute pressure sensor output terminal (terminal No. 1).

FUNCTION

The manifold absolute pressure sensor detects a change in intake pipe pressure and inputs the signal to the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
In response to the signal, the engine-ECU <M/T> or engine-A/T-ECU <A/T> corrects the fuel injection amount, etc.

TROUBLE JUDGMENT

Check Condition

2 seconds later after the ignition switch has been in "ON" position or the engine has started up

Judgment Criterion

The manifold absolute pressure sensor output voltage should is lower than 0.2 V for 2 seconds.

PROBABLE CAUSES

Failed manifold absolute pressure sensor
Open/short circuit in manifold absolute pressure sensor circuit or loose connector contact

Failed engine-ECU <M/T> or engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

Refer to Data List Reference Table .

Item 08: Manifold absolute pressure sensor

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Go to Step 2 .

STEP 2. Connector check: B-05 manifold absolute pressure sensor connector

Q. Is the check result normal?

	Go to Step 3 .

	Repair or replace the connector.

STEP 3. Perform voltage measurement at B-05 manifold absolute pressure sensor connector.

Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
Ignition switch: ON
Voltage between terminal No. 3 and earth.

OK: 4.9 - 5.1 V

Q. Is the check result normal?

	Go to Step 9 .

	Go to Step 4 .

STEP 4. Perform voltage measurement at D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector.

Measure engine-ECU <M/T> or engine-A/T-ECU <A/T> terminal voltage.
Ignition switch: ON
Voltage between terminal No. 97 and earth.

OK: 4.9 - 5.1 V

Q. Is the check result normal?

	Go to Step 8 .

	Go to Step 5 .

STEP 5. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 6 .

	Repair or replace the connector.

STEP 6. Check harness between B-05 (terminal No. 3) manifold absolute pressure sensor connector and D-246 (terminal No. 97) engine-ECU <M/T> connector or D-217 (terminal No. 97) engine-A/T-ECU <A/T> connector.

note

Before checking harness, check intermediate connector D-111, and repair if necessary.

Check power supply line for short circuit.

Q. Is the check result normal?

	Go to Step 7 .

	Repair the damaged harness wire.

STEP 7. M.U.T.-III data list

Refer to Data List Reference Table .

Item 08: Manifold absolute pressure sensor

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).

	Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.

STEP 8. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Check intermediate connector D-111, and repair if necessary. If intermediate connector is normal, check and repair harness between B-05 (terminal No. 3) manifold absolute pressure sensor connector and D-246 (terminal No. 97) engine-ECU <M/T> connector or D-217 (terminal No. 97) engine-A/T-ECU <A/T> connector. Check power supply line for open circuit and damage.

	Repair or replace the connector.

STEP 9. Perform resistance measurement at B-05 manifold absolute pressure sensor connector.

Disconnect and measure at harness side.
Ignition switch: ON
Resistance between terminal No. 2 and earth.

OK: Continuity (2 Ω or less)

Q. Is the check result normal?

	Go to Step 12 .

	Go to Step 10 .

STEP 10. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 11 .

	Repair or replace the connector.

STEP 11. Check harness between B-05 (terminal No. 2) manifold absolute pressure sensor connector and D-246 (terminal No. 96) engine-ECU <M/T> connector or D-217 (terminal No. 96) engine-A/T-ECU <A/T> connector.

note

Before checking harness, check intermediate connector D-111, and repair if necessary.

Check earthing line for damage.

Q. Is the check result normal?

	Go to Step 7 .

	Repair the damaged harness wire.

STEP 12. Perform voltage measurement at B-05 manifold absolute pressure sensor connector.

Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
Ignition switch: ON
Voltage between terminal No. 1 and earth.

Altitude 0m: 3.8 - 4.2 V
Altitude 600m: 3.5 - 3.9 V
Altitude 1,200m: 3.3 - 3.7 V
Altitude 1,800m: 3.0 - 3.4 V

Q. Is the check result normal?

	Go to Step 15 .

	Go to Step 13 .

STEP 13. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 14 .

	Repair or replace the connector.

STEP 14. Check harness between B-05 (terminal No. 1) manifold absolute pressure sensor connector and D-246 (terminal No. 101) engine-ECU <M/T> connector or D-217 (terminal No. 101) engine-A/T-ECU <A/T> connector.

Check output line for short circuit.

Q. Is the check result normal?

	Replace the manifold absolute pressure sensor.

	Repair the damaged harness wire.

STEP 15. Perform voltage measurement at D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector.

Measure engine-ECU <M/T> or engine-A/T-ECU <A/T> terminal voltage.
Ignition switch: ON
Voltage between terminal No. 101 and earth.

Altitude 0m: 3.8 - 4.2 V
Altitude 600m: 3.5 - 3.9 V
Altitude 1,200m: 3.3 - 3.7 V
Altitude 1,800m: 3.0 - 3.4 V

Q. Is the check result normal?

	Go to Step 17 .

	Go to Step 16 .

STEP 16. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Check and repair check harness between B-05 (terminal No. 1) manifold absolute pressure sensor connector and D-246 (terminal No. 101) engine-ECU <M/T> connector or D-217 (terminal No. 101) engine-A/T-ECU <A/T> connector. Check output line for open circuit and damage.

	Repair or replace the connector.

STEP 17. Connector check: D-246 engine-ECU <M/T> connector or D-217 engine-A/T-ECU <A/T> connector

Q. Is the check result normal?

	Go to Step 7 .

	Repair or replace the connector.