LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 1996 >> Millenia Base >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Diagnostic Trouble Code Testing >> DTC 17: Engine Speed Input Signal (1995)

DTC 17: Engine Speed Input Signal (1995)

  1. Check for engine control system related DTCs. See appropriate article:

    If no DTCs are present, go to next step. If any DTCs are present, repair as necessary.

  2. Connect an oscilloscope between ground and terminal 1D at ABS/TCS control module connector. See Figure . ABS/TCS control module is located behind left side of instrument panel. Start and allow engine to idle. Observe oscilloscope. Voltage should switch from a maximum of one volt to a minimum of 10 volts every 25-33 milliseconds. See Fig 1 . If voltage is as specified, replace ABS/TCS control module. If voltage is not as specified, turn ignition off and go to next step.
    Fig 1: Engine Speed Signal Voltage Pattern Id
    G97E08753Courtesy of MAZDA MOTORS CORP.
  3. Disconnect negative battery cable. Disconnect ABS/TCS control module connector. Reconnect negative battery cable. Using an ohmmeter, measure resistance between terminals 1D and 1B at ABS/TCS control module connector. If resistance is 7200-9300 ohms, go to next step. If resistance is not 7200-9300 ohms, replace ABS/TCS control module.
  4. Measure resistance between terminals 1D and 1A at ABS/TCS control module connector. If resistance is infinite, go to next step. If resistance is not infinite, replace ABS/TCS control module.
  5. Disconnect Engine Control Module (ECM) connector. ECM is located behind front of shifter console. Check for continuity between terminal 1D at ABS/TCS control module connector and terminal 1T (2.5L) or 2O (2.3L) at ECM connector. See Figure and Figure or Figure . If continuity exists, go to next step. If continuity does not exist, repair open circuit in wiring harness.
  6. On 2.5L, measure resistance between terminals 1T and 3O at ECM connector. On 2.3L, measure resistance between terminals 2O and 3AB at ECM connector. On all models, if resistance is more than 1800 ohms, go to next step. If resistance is 1800 ohms or less, check tachometer (engine speed input circuit) and related wiring harness. See INSTRUMENT PANEL article in ACCESSORIES/SAFETY EQUIPMENT Section. Repair as necessary. Also check engine speed input circuit to Transaxle Control Module (TCM). See DIAGNOSTIC TROUBLE CODE P0725 diagnostic test in appropriate article:
  7. On 2.5L, measure resistance between terminals 1T and 4B. at ECM connector. On 2.3L, measure resistance between terminals 2O and 4A at ECM connector. On all models, if resistance is infinite, replace ECM. If resistance is not infinite, check tachometer (engine speed input circuit) and related wiring harness. See INSTRUMENT PANEL article in ACCESSORIES/SAFETY EQUIPMENT Section. Repair as necessary. Also check engine speed input circuit to Transaxle Control Module (TCM). See DIAGNOSTIC TROUBLE CODE P0725 diagnostic test in appropriate article:
scientia non olet · About LEMON Manuals