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

  1. TDC sensor is a component part of crank angle sensor and is attached to cylinder head, mounted in place of distributor. If checking for no-start condition, ensure crank angle and TDC sensor assembly shaft rotates (indicating timing belt is okay) before checking electrical operation of crank angle and TDC sensor assembly.
  2. Using an analog (needle-type) voltmeter, connect negative lead to ground. Locate 4-wire connector between crank angle/TDC sensor assembly and main wiring harness. This connector is referred to as "crank angle connector" throughout this testing procedure.
  3. On Colt, Colt 200 and Mirage 1.6L, connect voltmeter positive lead to crank angle connector terminal No. 4. See Figure and Figure .
  4. On all models, to prevent engine from starting and to prevent damage to oils and other electrical system components, disconnect and ground all spark plug wires.
  5. Crank engine. If voltmeter pulsates between 1.5-2.0 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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