LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2007 >> 3 Mazdaspeed, 2.3 L >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Instrumentation/Driver Info >> Information Display Input/Output Check Mode >> Check Code Inspection >> Check code 04
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Check code 04

CHECK CODE 04 CHART

Check code 04 TNS relay ON/OFF signal
STEP INSPECTION CONDITION DISPLAY ACTION
1 Turn the headlight switch to the TNS position. (TNS relay ON) ON Go to the next step.
OFF Verify that the voltage of information display terminal C is B+.
  • If the voltage is as specified, replace the information display.
  • If the voltage is not as specified, inspect the following parts:
    • TNS relay
    • Wiring harness (Battery-TNS relay-information display)
2 Turn the headlight switch off. (TNS relay OFF) ON Verify that the voltage of the information display terminal C is 1.0 V or less. 
  • If the voltage is as specified, replace the information display.
  • If the voltage is not as specified, inspect the following parts:
    • TNS relay
    • Wiring harness (TNS relay-information display)
OFF Input signal to the information display is normal.
scientia non olet · About LEMON Manuals