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6E-274 Engine Control System (4HK1) U2104, U2106 (Flash Code 84, 85) Circuit Description Condition for Running the DTC • The ignition switch is ON. Condition for Setting the DTC • The ECM detects that the CAN Bus OFF status. U2106 • The ECM detects that the CAN Bus messages from the TCM are not being received. Action Taken When the DTC Sets • The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. • The ECM blinks the exhaust brake indicator lamp when the diagnostic runs and fails. • The ECM inhibits exhaust brake control. Condition for Clearing the MIL / DTC • The ECM turns OFF the MIL when the key is cycled after a current DTC clears. • The ECM turns OFF the exhaust brake indicator lamp when the diagnostic runs and does not fail. • A current DTC clears when the diagnostic runs and does not fail. • A history DTC clears after 20 consecutive driving cycles without a fault. Or clear with the Tech 2 or Diagnostic Aid • If an intermittent condition is suspected, refer to Intermittent Conditions in this section. Notice: • Diagnostic charts are different depending on the specification of the vehicle. DTC U2104, U2106 (Flash Code 84, 85) Chart for without Smoother and ABS Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check – — Go to Step 2 Go to Diagnostic System Check – Engine Controls 2 1. Install the Tech 2. 2. Turn OFF the ignition for 30 seconds. 3. Monitor the engine control module (ECM) 4. Start the engine. Does the DTC fail this ignition? — Go to Step 3 Go to Diagnostic Aids 3 1. Turn OFF the ignition. 2. Measure the resistance across the controller Is the resistance within the specified value (parallel Ω resister 1 and the 120 Ω resistor 2 should be 60 Ω)? 50 – 70 Ω Go to Step 9 Go to Step 4 4 Is the resistance less than the specified value at — Go to Step 5 Go to Step 7 |