DIAGNOSTIC ITEM 8: Diagnose When The Scan Tool Cannot Receive The Data Sent By KOS&OSS-ECU. <Vehicles With KOS>: Diagnosis

STEP 1. Connector check: joint connector (CAN1) and KOS&OSS-ECU connector
CAUTION: The strand end of the twist wire should be within 10 cm (4 inches) 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 faulty connector. Replace the joint connector as necessary.
STEP 2. Resistance measurement at joint connector (CAN1) and KOS&OSS-ECU connector.
CAUTION:
- A digital multimeter should be used. For details refer to SERVICE PRECAUTIONS .
- The test wiring harness should be used. For details refer to SERVICE PRECAUTIONS .
- Strictly observe the specified wiring harness repair procedure. For details refer to SERVICE PRECAUTIONS .
1. Disconnect joint connector (CAN1) and the KOS&OSS-ECU 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. 11 and KOS&OSS-ECU connector terminal No. 35
  OK: Continuity (2 Ω or less)
5. Continuity between joint connector (CAN1) terminal No. 22 and KOS&OSS-ECU connector terminal No. 51
  OK: Continuity (2 Ω or less)
Q: Is the check result normal?
1. YES: <All the resistances measure 2 Ω or less> Power supply to the KOS&OSS-ECU may be suspected. Diagnose the KOS. Refer to GROUP 42B - Troubleshooting P.42B-97.
2. NO: <Either or all of the resistances measure more than 2 > Repair the wiring harness between joint connector (CAN1) and the KOS&OSS-ECU connector.