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C1604 - ECU Defect, Internal Errors or Solenoid Fault On Board Diagnostic Logic DTC NO. DTC DEFINITION DTC DETECTION CONDITION POSSIBLE CAUSE C1604 ECU defect, internal errors or solenoid fault ECM detected an internal failure or solenoid failure. ABS module or solenoid DTC Confirmation Procedure: Before performing the following procedure, confirm that battery voltage is more than 12 V. • Turn ignition switch off. • Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available. • Turn ignition switch on. • With the scan tool, record and erase stored DTCs in the ABS module. • Cycle the ignition switch. • Start engine and warm it to normal operating temperature. • Turn ignition switch off and wait for a few seconds. • Start the engine. With the scan tool connected to the DLC, drive the vehicle over 40 km/h (25 mph). • With the scan tool select: View ABS Data Stream and DTC. • If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1. • If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou- bleshooting in Section 12 Brakes for more information). • Erase all codes and test drive the vehicle to verify the repair is complete. NOTE : DIAGNOSIS & TESTING
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