Cold Start Injector Time Switch
- 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. To verify wire colors for proper identification, see appropriate wiring diagram in WIRING DIAGRAMS
article.NOTE: Cold start injector time switch may also be identified using appropriate illustration in THEORY/OPERATION article.
- Note cold start injector time switch 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) | Ohm Readings |
|---|---|---|
| STA-STJ | Less Than 50 (10) | 30-50 |
| " | Greater Than 77 (25) | 70-90 |
| STA-Ground | N/A | 30-90 |
NOTE:
Coolant temperature sensor may also be referred to as Engine Coolant Temperature (ECT) sensor.