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T–144 ON-BOARD DIAGNOSTIC [MULTIPLEX COMMUNICATION SYSTEM] DTC U0073, U1900, U2516 A6E816255430W05 Diagnostic procedure DTC U0073 CAN system communication error U1900 U2516 CAN system wiring harness open and short circuit DETECTION CONDITION Warning Performing inspection with only detection conditions may cause injury due to operating error • CAN system related harness malfunction • Related module communication error POSSIBLE CAUSE • Open or short circuit in wiring harness • Malfunction of connectors between PCM, ABS (ABS/TCS) HU/CM or DSC HU/CM and Instrument cluster • PCM malfunction • ABS (ABS/TCS) HU/CM malfunction (with ABS (ABS/TCS)) • DSC HU/CM malfunction (with DSC) • Instrument cluster malfunction STEP INSPECTION ACTION 1 DETERMINING THE LOCATION OF A • Determine the malfunctioning part of the DETERMINING THE LOCATION OF A • Is the malfunctioning part the wiring harness C or the instrument cluster? Yes Go to Step 4. No Go to next step. 2 DETERMINING THE LOCATION OF A • Is the malfunctioning part the wiring harness B or the ABS (ABS/TCS) HU/CM? (with ABS • Is the malfunctioning part the wiring harness B or the DSC HU/CM? (with DSC) Yes Go to Step 8. No Go to next step. 3 DETERMINING THE LOCATION OF A • Is the malfunctioning part the wiring harness A or the PCM? Yes Go to Step 12. No Troubleshooting completed. 4 INSPECT INSTRUMENT CLUSTER • Disconnect negative battery cable. • Disconnect instrument cluster connector. • Is poor connection detection bars of instrument cluster connector okay? Yes Go to next step. No Replace wiring harness. 5 • Is vehicle equipped with DSC? Yes Go to next step. No Go to Step 7. |