Code No. P0105: Manifold Absolute Pressure Sensor System <Vehicles for Hong kong>

OPERATION

A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 3) from the engine-A/T-ECU (terminal No. 97) and earthed to the engine-A/T-ECU (terminal No. 96) from the manifold absolute pressure sensor (terminal No. 2).

The sensor signal is inputted to the engine-A/T-ECU (terminal No. 101) from the manifold absolute pressure sensor output terminal (terminal No. 1).

FUNCTION

The manifold absolute pressure sensor converts the manifold absolute pressure into a voltage signal and inputs the signal to the engine-A/T-ECU.

In response to the signal, the engine-A/T-ECU corrects the fuel injection amount, etc.

TROUBLE JUDGMENT

Check Conditions

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

The battery voltage is 8 V or more.

Judgment Criteria

The sensor output voltage is 4.5V or more (barometric pressure above 114 kPa or equivalent) for 4 seconds.

The sensor output voltage is 0.2 V or less (barometric pressure below 53 kPa or equivalent) for 4 seconds.

PROBABLE CAUSE

Failed Manifold absolute pressure sensor

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

Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III data list

Refer to Data List Reference Table .

Item 95: Manifold absolute pressure sensor

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Go to Step 2

STEP 2. Connector check: B-113 Manifold absolute pressure sensor connector

Q: Is the check result normal?

YES: Go to Step 3

.
NO: Repair.

STEP 3. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.

Disconnect and measure at harness side.

Ignition switch: ON

Voltage between terminal No. 3 and earth.

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 9

.
NO: Go to Step 4

STEP 4. Perform voltage measurement at C-137 engine-A/T-ECU connector.

Measure engine-A/T-ECU terminal voltage.

Ignition switch: ON

Voltage between terminal No. 97 and earth.

OK: 4.9 - 5.1 V

Q: Is the check result normal?

YES: Go to Step 5

.
NO: Go to Step 6

STEP 5. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector.

Check power supply line for open circuit.

NO: Repair.

STEP 6. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 7

.
NO: Repair.

STEP 7. Check harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector.

Check power supply line for short circuit.

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair.

STEP 8. MUT-II/III data list

Refer to Data List Reference Table .

Item No. 95: Manifold absolute pressure sensor

Q: Is the check result normal?

YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points

).
NO: Replace engine-A/T-ECU.

STEP 9. Perform resistance measurement at B-113 manifold absolute pressure sensor connector.

Disconnect and measure at harness side.

Ignition switch: ON

Resistance between terminal No. 2 and earth.

OK: 2 Ω or less

Q: Is the check result normal?

YES: Go to Step 12

.
NO: Go to Step 10

STEP 10. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 11

.
NO: Repair.

STEP 11. Check harness between B-113 (terminal No. 2) manifold absolute pressure sensor connector and C-137 (terminal No. 96) engine-A/T-ECU connector.

Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair.

STEP 12. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.

Use special tool test harness (MB991348) 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?

YES: Go to Step 14

.
NO: Go to Step 13

STEP 13. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector.

Check power supply line for damage.

NO: Repair.

STEP 14. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.

Use special tool test harness (MB991348) to connect connector, and measure at pick-up harness.

Ignition switch: ON

Voltage between terminal No. 1 and earth.

OK:

Altitude 0m: 3.7 - 4.3 V

Altitude 600m: 3.4 - 4.0 V

Altitude 1,200m: 3.2 - 3.8 V

Altitude 1,800m: 2.9 - 3.5 V

Q: Is the check result normal?

YES: Go to Step 17

.
NO: Go to Step 15

STEP 15. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 16

.
NO: Repair.

STEP 16. Check harness between B-113 (terminal No. 1) manifold absolute pressure sensor connector and C-137 (terminal No. 101) engine-A/T-ECU connector.

Check output line for short circuit and damage.

Q: Is the check result normal?

YES: Replace manifold absolute pressure sensor.
NO: Repair.

STEP 17. Perform voltage measurement at C-137 engine-A/T-ECU connector.

Measure engine-A/T-ECU terminal voltage.

Ignition switch: ON

Voltage between terminal No. 101 and earth.

OK:

Altitude 0m: 3.7 - 4.3 V

Altitude 600m: 3.4 - 4.0 V

Altitude 1,200m: 3.2 - 3.8 V

Altitude 1,800m: 2.9 - 3.5 V

Q: Is the check result normal?

YES: Go to Step 19

.
NO: Go to Step 18

STEP 18. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES:

Check and repair check harness between B-113 (terminal No. 1) manifold absolute pressure sensor connector and C-137 (terminal No. 101) engine-A/T-ECU connector.

Check output line for open circuit and damage.

NO: Repair.

STEP 19. Connector check: C-137 engine-A/T-ECU connector

Q: Is the check result normal?

YES: Go to Step 8

.
NO: Repair.


Code No. P0105: Manifold Absolute Pressure Sensor System <Vehicles for Hong kong>

OPERATION A power voltage of 5 V is applied to the manifold absolute pressure sensor power terminal (terminal No. 3) from the engine-A/T-ECU (terminal No. 97) and earthed to the engine-A/T-ECU (terminal No. 96) from the manifold absolute pressure sensor (terminal No. 2). The sensor signal is inputted to the engine-A/T-ECU (terminal No. 101) from the manifold absolute pressure sensor output terminal (terminal No. 1).
FUNCTION The manifold absolute pressure sensor converts the manifold absolute pressure into a voltage signal and inputs the signal to the engine-A/T-ECU. In response to the signal, the engine-A/T-ECU corrects the fuel injection amount, etc.
TROUBLE JUDGMENT Check Conditions 2 seconds later after the ignition switch has been in "ON" position or the engine has started up The battery voltage is 8 V or more. Judgment Criteria The sensor output voltage is 4.5V or more (barometric pressure above 114 kPa or equivalent) for 4 seconds. or The sensor output voltage is 0.2 V or less (barometric pressure below 53 kPa or equivalent) for 4 seconds.
PROBABLE CAUSE Failed Manifold absolute pressure sensor Open/short circuit in Manifold absolute pressure sensor circuit or loose connector contact Failed engine-A/T-ECU
	DIAGNOSIS PROCEDURE

	STEP 1. MUT-II/III data list Refer to Data List Reference Table . Item 95: Manifold absolute pressure sensor Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Go to Step 2 .
	STEP 2. Connector check: B-113 Manifold absolute pressure sensor connector
	Q: Is the check result normal? YES: Go to Step 3 . NO: Repair.
	STEP 3. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.
	Disconnect and measure at harness side. Ignition switch: ON Voltage between terminal No. 3 and earth. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 9 . NO: Go to Step 4 .
	STEP 4. Perform voltage measurement at C-137 engine-A/T-ECU connector.
	Measure engine-A/T-ECU terminal voltage. Ignition switch: ON Voltage between terminal No. 97 and earth. OK: 4.9 - 5.1 V Q: Is the check result normal? YES: Go to Step 5 . NO: Go to Step 6 .
	STEP 5. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector. Check power supply line for open circuit. NO: Repair.
	STEP 6. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 7 . NO: Repair.
	STEP 7. Check harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector.
	Check power supply line for short circuit. Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.
	STEP 8. MUT-II/III data list Refer to Data List Reference Table . Item No. 95: Manifold absolute pressure sensor Q: Is the check result normal? YES: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ). NO: Replace engine-A/T-ECU.
	STEP 9. Perform resistance measurement at B-113 manifold absolute pressure sensor connector.
	Disconnect and measure at harness side. Ignition switch: ON Resistance between terminal No. 2 and earth. OK: 2 Ω or less Q: Is the check result normal? YES: Go to Step 12 . NO: Go to Step 10 .
	STEP 10. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 11 . NO: Repair.
	STEP 11. Check harness between B-113 (terminal No. 2) manifold absolute pressure sensor connector and C-137 (terminal No. 96) engine-A/T-ECU connector.
	Check earthing line for open circuit and damage. Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.
	STEP 12. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.
	Use special tool test harness (MB991348) 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? YES: Go to Step 14 . NO: Go to Step 13 .
	STEP 13. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair harness between B-113 (terminal No. 3) manifold absolute pressure sensor connector and C-137 (terminal No. 97) engine-A/T-ECU connector. Check power supply line for damage. NO: Repair.
	STEP 14. Perform voltage measurement at B-113 manifold absolute pressure sensor connector.
	Use special tool test harness (MB991348) to connect connector, and measure at pick-up harness. Ignition switch: ON Voltage between terminal No. 1 and earth. OK: Altitude 0m: 3.7 - 4.3 V Altitude 600m: 3.4 - 4.0 V Altitude 1,200m: 3.2 - 3.8 V Altitude 1,800m: 2.9 - 3.5 V Q: Is the check result normal? YES: Go to Step 17 . NO: Go to Step 15 .
	STEP 15. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 16 . NO: Repair.
	STEP 16. Check harness between B-113 (terminal No. 1) manifold absolute pressure sensor connector and C-137 (terminal No. 101) engine-A/T-ECU connector.
	Check output line for short circuit and damage. Q: Is the check result normal? YES: Replace manifold absolute pressure sensor. NO: Repair.
	STEP 17. Perform voltage measurement at C-137 engine-A/T-ECU connector.
	Measure engine-A/T-ECU terminal voltage. Ignition switch: ON Voltage between terminal No. 101 and earth. OK: Altitude 0m: 3.7 - 4.3 V Altitude 600m: 3.4 - 4.0 V Altitude 1,200m: 3.2 - 3.8 V Altitude 1,800m: 2.9 - 3.5 V Q: Is the check result normal? YES: Go to Step 19 . NO: Go to Step 18 .
	STEP 18. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Check and repair check harness between B-113 (terminal No. 1) manifold absolute pressure sensor connector and C-137 (terminal No. 101) engine-A/T-ECU connector. Check output line for open circuit and damage. NO: Repair.
	STEP 19. Connector check: C-137 engine-A/T-ECU connector
	Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.