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1A-187 Engine General Information and Diagnosis: For Petrol Engine Model 5 ECM power and ground circuit check Power and Ground Circuit Check: For Petrol Engine Are they in good condition? Go to Step 6. Repair ECM power and/ 6 DTC check in BCM Is it indicated? Go to “DTC U1073 (No. Go to Step 7. 7 CAN communication circuit check • Circuit resistance of CAN communication circuit is less than 1 Ω between “WHT/RED” terminal of ECM connector and “RED” terminal of BCM connector. • Circuit resistance of CAN communication circuit is less than 1 Ω between “WHT/BLU” terminal of ECM connector and “WHT” terminal of BCM connector. Is it in good condition? Go to Step 9. Go to Step 8. 8 ABS or ESP ® control module check 1) Measure resistance at following connector terminals. • Between “WHT/BLU” terminal and “WHT” terminal of ABS or ESP ® control module connector. • Between “WHT/RED” terminal and “RED” terminal of ABS or ESP ® control module connector. Is measured resistance below 1 Ω ? CAN communication Substitute a known- ® control module and 9 DTC check switch turned OFF. 2) Disconnect connectors from TCM (for A/T model) with ignition switch turned OFF. 3) Check ECM for DTC. Is there DTC P1678? Go to Step 10. CAN communication 10 DTC check 1) Disconnect connector from keyless start control module (if equipped) with ignition switch turned OFF. 2) Check ECM for DTC. Is there DTC P1678? Go to Step 11. CAN communication Step Action Yes No |