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.
2003 Mazda MPV ESFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | Description |
|---|---|
| DTC 01 | Buckle Switch On/Off Signal |
| DTC 04 | Door Switch On/Off Signal |
| DTC 05 | Door Lock-Link Switch On/Off Signal |
| DTC 07 | Rear Window Defroster Switch On/Off Signal |
| DTC 08 | TNS Relay On/Off Signal |
| DTC 10 | Vehicle Speed Input Signal |
| DTC 11 | Engine Speed Input Signal |
| DTC 12 | Operation Signal To Speedometer |
| DTC 13 | Operation Signal To Tachometer |
| DTC 14 | Operation Signal To Buzzer |
| DTC 16 | Operation Signal To Fuel-Level Warning Light |
| DTC 17 | Operation Signal To Rear Window Defroster Indicator Light |
| DTC 18 | Ignition Key Illumination On/Off Signal |
| DTC 20 | Operation Signal To Rear Window Defroster Relay On/Off Signal |
| DTC 22 | Fuel Level Signal |
| DTC 23 | Operation Signal To Fuel Gauge |
| DTC 24 | Water Temperature Signal |
| DTC 25 | Operation Signal To Water Temperature Gauge |
| DTC 26 | LCD Indication |
| DTC 27 | Operation Signal To Interior Light |
| DTC 31 | Key Reminder On/Off Signal |
| DTC 41 | P Position Switch On/Off Signal |
| DTC 42 | Operation Signal To Interlock Solenoid |
Factory Service Tools
Use the Manual With the Right Hardware
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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.