HINT:

Read freeze frame data using the Intelligent tester or Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

CHECK DTC
1. Clear DTC (see DTC CHECK / CLEAR ).
2. Turn the engine switch off.
3. Disconnect the battery negative terminal and wait for 1 minute (see PRECAUTION ).
4. Connect the battery negative terminal (see PRECAUTION ).
5. Turn the engine switch on (IG).
6. Connect the Intelligent tester or Techstream to the DLC3.
7. Turn the tester ON.
8. Enter the following menus:
  1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
  2. Techstream - Select: Powertrain / Engine / Trouble Codes.
9. Check DTC.
  OK: P0604 is not present.
NG: REPLACE ECM (See REMOVAL )

OK: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Inspection Procedure

Use the Manual With the Right Hardware

When to See a Mechanic

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