Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code Chart
When replacing the brake booster with master cylinder (skid control ECU), sensor, etc., make sure that the power switch is turned off, the stop light switch is off, and 2 minutes have elapsed since the driver's door was closed.
HINT:
- If no abnormality is found when inspecting parts, inspect the skid control ECU and ground points for poor connections.
- If a trouble code is displayed during the DTC check, check the circuit indicated by the DTC. For details of each code, refer to information for the respective "DTC Code" in the DTC chart.
- When 2 or more DTCs are detected, perform circuit inspections one by one until the problem is identified.
- Inspect the fuses and relays before inspecting the trouble areas as shown in the table below.
| DTC Code | Detection Item | INF Code | See |
|---|---|---|---|
| C1241/41 | Low Battery Positive Voltage | 101*1 102*1 551*2 552*2 553*2 |
Refer to DTC C1241/41: Low Battery Positive Voltage; DTC C1242/42: Open in IG1 / IG2 Power Source Circuit |
*1: Electronically Controlled Brake System DTC
*2: ABS DTC
| DTC Code | Detection Item | INF Code | See |
|---|---|---|---|
| C1346/71 | Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC) | - | Refer to DTC C1247/47: Stroke Sensor Malfunction; DTC C1346/71: Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC); DTC C1392/48: Stroke Sensor Zero Point Calibration Undone |
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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.
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