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Cold Start Injector Time Switch

  1. Ensure ignition is off. Disconnect electrical connector from cold start injector time switch. Cold start injector time switch is located in engine coolant passage near cylinder head or thermostat housing. It may be necessary to verify wire colors for proper identification. See appropriate wiring diagram in WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section.
    NOTE: Cold start injector time switch may also be identified by appropriate illustration in THEORY/OPERATION article in the ENGINE PERFORMANCE Section.
  2. Note cold start injector terminal identification. See Fig 1. Using ohmmeter, measure resistance at designated switch terminals at specified temperature. See COLD START INJECTOR TIME SWITCH RESISTANCE SPECIFICATIONS table. Replace cold start injector time switch if resistance is not within specification.
COLD START INJECTOR TIME SWITCH RESISTANCE SPECIFICATIONS

Application & Terminals Temperature °F (°C) Ohms
STA-STJ Less Than 59 (15) 25-45
STA-STJ Greater Than 86 (30) 65-85
STA-Ground ***** 25-85
Fig 1: Testing Typical Cold Start Injector Time Switch
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