− INTRODUCTION HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS IN−35 2. CONNECTOR HANDLING When inserting tester probes into a connector, insert them from the rear of the connector. When necessary, use mini test leads. For water resistant connectors which cannot be accessed from behind, take good care not to deform the connector terminals. FI7187 3. CONTINUITY CHECK (OPEN CIRCUIT CHECK) (a) Disconnect the connectors at both ECU and sensor sides. Sensor Side ECU Side IN0379 (b) Measure the resistance between the applicable terminals of the connectors. Resistance: 1 Ω or less HINT: Measure the resistance while lightly shaking the wire harness vertically and horizontally.
ECU Side Sensor Side IN0378 ECU Side 4. RESISTANCE CHECK (SHORT CIRCUIT CHECK) (a) Disconnect the connectors on both ends. (b) Measure the resistance between the applicable terminals of the connectors and body ground. Be sure to carry out this check on the connectors on both ends. Resistance: 1 M Ω or higher HINT: Measure the resistance while lightly shaking the wire harness vertically and horizontally. Sensor Side IN0380 5. VISUAL CHECK AND CONTACT PRESSURE CHECK (a) Disconnect the connectors at both ends. (b) Check for rust or foreign material, etc. in the terminals of the connectors.
(c) Check crimped portions for looseness or damage and check that the terminals are secured in lock portion. HINT: The terminals should not come out when pulled lightly from the back. Pull Lightly Looseness of Crimping IN0381 2000 LEXUS LX470 (RM745U) 35 Author : Date: