Posted in Mitsubishi Colt

P0130 – Oxygen Sensor (Front) System MMC Colt

 Posted by  Posted on September 26, 2020

OPERATION

  • The sensor signal is inputted to the engine-ECU (terminal No. 97) from the oxygen sensor (front) output terminal (terminal No. 1).
  • The oxygen sensor (front) (terminal No. 2) is earthed with engine-ECU (terminal No. 98).

    • FUNCTION

  • The oxygen sensor (front) converts the concentration of oxygen in the exhaust emission into a voltage and inputs the signal to the engine-ECU.
  • When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (front) outputs a voltage of about 1 V. When it is leaner than the theoretical air-fuel ratio, it outputs a voltage of about 0 V.
  • In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel ratio can be equivalent to the theoretical air-fuel ratio.

    • TROUBLE JUDGMENT

  • Above 3 minutes later after the engine has started up.
  • The engine coolant temperature is approx. 82°C or higher.
  • The engine speed is 1,200 r/min or more.
  • The monitoring time is 10 seconds.
  • When the oxygen sensor (front) output voltage is 0.2 V or less and a power voltage of 5 V is applied to the oxygen sensor (front) in the engine-ECU, the sensor output voltage is 4.5 V or more.
  • To be monitored once per driving cycle.
  • The engine speed is 1,200 – 3,000 r/min.
  • The engine coolant temperature is approx. 60°C or higher.
  • Volumetric efficiency is 20 – 60 %.
  • During the air-fuel ratio feedback control
  • When the oxygen sensor (front) output frequency is 9 or less for 10 seconds on the average.

    • PROBABLE CAUSES

  • Failed oxygen sensor (front)
  • Failed engine-ECU
  • Open or shorted oxygen sensor (front) circuit, harness damage, or connector damage

    • DIAGNOSIS PROCEDURE

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

  • Item No. 9: Oxygen sensor (front)

    • Q. Is the check result normal?

    STEP 2. Connector check: B-108 oxygen sensor (front) connector

    Q. Is the check result normal?

    STEP 3. Perform resistance measurement at B-108 oxygen sensor (front) connector.

  • Disconnect connector, and measure at harness side.
  • Resistance between terminal No. 2 and earth.

    • Q. Is the check result normal?

    STEP 4. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

    STEP 5. Check harness between B-108 (terminal No. 2) oxygen sensor (front) connector and A-09 (terminal No. 98) engine-ECU connector.

  • Check earthing line for open circuit and damage.

    • Q. Is the check result normal?

    STEP 6. M.U.T.-III data list

  • Item No. 9: Oxygen sensor (front)

    • Q. Is the check result normal?

    STEP 7. Perform voltage measurement at B-108 oxygen sensor (front) connector.

  • Use special tool test harness (MB998658) to connect connector, and measure at pick-up harness.
  • Engine: After warm-up
  • Transmission: Neutral.
  • Voltage between terminal No. 1 and earth.

    • Q. Is the check result normal?

    STEP 8. Check oxygen sensor (front) itself.

    Q. Is the check result normal?

    STEP 9. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for short circuit.

    • STEP 10. Perform voltage measurement at A-09 engine-ECU connector.

  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB991987), and then measure the voltage on the check connector.
  • Transmission: Neutral
  • Engine: After warm-up
  • Voltage between terminal No. 97 and earth.

    • Q. Is the check result normal?

    STEP 11. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

  • Check output line for open circuit and damage.

    • STEP 12. Connector check: A-09 engine-ECU connector

    Q. Is the check result normal?

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