LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 1986 >> 626 Base >> Repair and Diagnosis >> Engine Performance >> System >> EFI Control System >> Testing >> Diagnostic Procedure >> Code 4 (Intake Air Temperature Sensor)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Code 4 (Intake Air Temperature Sensor)

  1. Check for poor connections at intake air temperature sensor connector. Repair or replace as necessary. If connections are okay, check resistance of sensor. If resistance is within 94-73,800 ohms, go to next step. If not, replace intake air temperature sensor.
  2. Measure voltage at terminal "2J" of ECU. If reading is 12 volts, check for open circuit in wiring harness. If reading is zero volts, check for short circuit in wiring harness from sensor to terminal "2J" of ECU connector. If short is not located, replace faulty ECU.
scientia non olet · About LEMON Manuals