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Home >> Plymouth >> 1990 >> Colt Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - PFI >> TDC Sensor (SOHC Engines) >> Test No. 1
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Test No. 1

  1. TDC sensor is a component part of crank angle sensor and is located inside distributor. If checking no start condition, ensure distributor shaft rotates (indicating timing belt is okay) before checking electrical operation of crank angle and TDC sensor assembly.
  2. To prevent engine from starting, disconnect coil wire from distributor cap and connect to ground. Using an analog (needle-type) voltmeter, connect negative lead to ground.
  3. Connect voltmeter positive lead to distributor connector terminal as specified in TDC SENSOR SIGNAL WIRE TERMINAL IDENTIFICATION (SOHC)  . See Figure and Figure .
  4. Crank engine. If voltmeter pulsates at approximately .5-1.5 volts, crank angle sensor is okay. If voltmeter remains at 5 volts during cranking, go to TEST NO. 2. If voltmeter remains at 0 volts during cranking, go to TEST No. 3.
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