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ENGINE CONTROL SYSTEM (4JK1/4JJ1) 6E-203 DTC P0642 or P0643 (Flash Code 55) Circuit Description The ECM provides 5 volts reference voltage through Condition for Running the DTC • The battery voltage is more than 6 volts. • The ignition switch is ON. Condition for Setting the DTC • The ECM detects that the 5 volts reference circuit 1 voltage is less than 4.7 volts. (DTC P0642) • The ECM detects that the 5 volts reference circuit 1 voltage is more than 5.3 volts. (DTC P0643) Action Taken When the DTC Sets • The ECM illuminates the SVS lamp when the diagnostic runs and fails. Refer to DTC Type • The ECM illuminates the MIL when the diagnostic runs and fails. Refer to DTC Type Definitions for • The ECM limits fuel injection quantity • The ECM inhibits cruise control. Condition for Clearing the DTC • Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp/ DTC - Type C. (Euro 4 • Refer to DTC Type Definitions for Condition for Clearing the MIL/ DTC - Type A. (Except Euro 4 Diagnostic Aids • If an intermittent condition is suspected, refer to Intermittent Conditions in this section. Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Controls Circuit/ System Testing DTC P0642 Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check - — Go to Step 2 Go to Diagnostic System Check - 2 1. Install a scan tool. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Monitor the DTC Information with a scan tool. Does the DTC fail this ignition? — Go to Step 3 Go to Diagnostic Aids 3 1. Turn OFF the ignition. 2. Disconnect the accelerator pedal position 3. Connect a DMM between the 5 volts reference 4. Turn ON the ignition, with engine OFF. Is the DMM voltage more than the specified value? 4.7 volts Go to Step 5 Go to Step 4 4 1. Test the 5 volts reference circuit between the • A short to ground • A short to the low reference circuit 2. Repair the circuit(s) as necessary. Did you find and correct the condition? — Go to Step 7 Go to Step 6 |