Diagnostic Item 21: Diagnose when the scan tool cannot receive the data sent by engine control module: DIAGNOSIAS

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Connector check: joint connector (CAN1) < vehicles without ACC > or joint connector (CAN2) < vehicles with ACC > and ECM connector
CAUTION: The strand end of the twist wire should be within 10 cm from the connector. For details refer to SERVICE PRECAUTIONS .

When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.

Q: Is the check result normal?
1. YES: Go to Step 2.
2. NO: Repair the defective connector. Replace the joint connector as necessary.
STEP 2. Resistance measurement at joint connector (CAN1) < vehicles without ACC > or joint connector (CAN2) < vehicles with ACC > and ECM connector.
CAUTION: A digital multimeter should be used. For details refer to SERVICE PRECAUTIONS .

CAUTION: The test wiring harness should be used. For details refer to SERVICE PRECAUTIONS .
1. Disconnect the joint connector (CAN1) < vehicles without ACC > or joint connector (CAN2) < vehicles with ACC > and the ECM connector, and measure at the wiring harness side.
2. Turn the ignition switch to the LOCK (OFF) position.
  CAUTION: When measuring the resistance, disconnect the negative battery terminal. For details refer to SERVICE PRECAUTIONS .
3. Ensure that the negative battery terminal is disconnected.
4. Continuity between joint connector (CAN1) terminal No.10 and ECM connector terminal No.90 < vehicles without ACC >
  OK: Continuity (2 ohms or less)
5. Continuity between joint connector (CAN1) terminal No.21 and ECM connector terminal No.91 < vehicles without ACC >
  OK: Continuity (2 ohms or less)
6. Continuity between joint connector (CAN2) terminal No.10 and ECM connector terminal No.90 < vehicles with ACC >
  OK: Continuity (2 ohms or less)
7. Continuity between joint connector (CAN2) terminal No.21 and ECM connector terminal No.91 < vehicles with ACC >
  OK: Continuity (2 ohms or less)
  
  CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS .
Q: Is the check result normal?
1. YES: < All the resistances measure 2 ohms or less > Go to Step 3.
2. NO: < Either or all of the resistances measure more than 2 ohms > Repair the wiring harness between joint connector (CAN1) < vehicles without ACC > or joint connector (CAN2) < vehicles with ACC > and the ECM.
STEP 3. Resistance measurement at ECM connector.
CAUTION: A digital multimeter should be used. For details refer to SERVICE PRECAUTIONS .
1. Remove the ECM, and measure at the equipment side.
2. Resistance between ECM connector terminal Nos.90 and 91
  OK: 120 ± 20 ohms
  
  CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS .
Q: Is the check result normal?
1. YES: < Within 120 ± 20 ohms > Power supply to the ECM may be suspected. Diagnose the fuel system. (Refer to DTC CHART < 2.4 L ENGINE >, GROUP 13B - DTC Chart P.13B-51 < 3.0 L ENGINE >)
2. NO: < Not within 120 ± 20 ohms > Replace the ECM.