WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Proceed trouble diagnosis according to the check sheet results (example).

Case 1: Replace ECM.

Case 2: Replace TCM.

Case 3: Replace BCM.

Case 4: Replace ABS actuator and electric unit (control unit). Refer to ACTUATOR AND ELECTRIC UNIT (ASSEMBLY) .

Case 5: Check harness between TCM and combination meter. Refer to "CIRCUIT CHECK BETWEEN TCM AND COMBINATION METER ".

Case 6: Check harness between combination meter and BCM. Refer to "CIRCUIT CHECK BETWEEN COMBINATION METER AND BCM ".

Case 7: Check harness between BCM and ABS actuator and electric unit (control unit). Refer to "CIRCUIT CHECK BETWEEN BCM AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) ".

Case 8: Check ECM circuit. Refer to "ECM CIRCUIT CHECK ".

Case 9: Check TCM circuit. Refer to "TCM CIRCUIT CHECK ".

Case 10: Check combination meter circuit. Refer to "COMBINATION METER CIRCUIT CHECK ".

Case 11: Check BCM circuit. Refer to "BCM CIRCUIT CHECK ".

Case 12: Check ABS actuator and electric unit (control unit) circuit. Refer to "ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) CIRCUIT CHECK ".

Case 13: Check IPDM E/R circuit. Refer to "IPDM E/R CIRCUIT CHECK ".

Case 14: Check CAN communication circuit. Refer to "CAN COMMUNICATION CIRCUIT CHECK ".

Case 15: Check IPDM E/R ignition relay circuit. Refer to "IPDM E/R IGNITION RELAY CIRCUIT CHECK ".

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

Work Flow: Inspection

Use the Manual With the Right Hardware

When to See a Mechanic