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INTRODUCTION – HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS IN–47 IN (b) Check the resistance. (1) Disconnect connectors A and C and measure the resistance between them. HINT: (2) Disconnect connector B and measure the resistance between the connectors. If the results match the examples above, an (c) Check the voltage. (1) In a circuit in which voltage is applied to the ECU connector terminal, an open circuit can be If the results match the examples above, an Fig. 2 ECU B SENSOR A C 1 2 2 2 1 1 Z017005E02 Tester Connection Specified Condition Connector A terminal 1 - Connector 10 k Ω or higher Connector A terminal 2 - Connector Below 1 Ω Fig. 3 ECU B2 SENSOR C 1 2 2 2 2 1 1 1 B1 A B004722E03 Tester Connection Specified Condition Connector A terminal 1 - Connector Below 1 Ω Connector B2 terminal 1 - Connector 10 k Ω or higher Fig. 4 0 V ECU B SENSOR A C 1 2 2 2 2 1 1 5 V 5 V Z017007E02 Tester Connection Specified Condition Connector A terminal 1 - Body 5 V Connector B terminal 1 - Body 5 V Connector C terminal 1 - Body Below 1 V |