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Home >> Jaguar >> 1983 >> XJ-S >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - LUCAS/BOSCH P >> Testing >> Cold Start System Test >> Engine Temperature Above 59°F (15°C)

Engine Temperature Above 59°F (15°C)

  1. Crank engine and check voltage at terminal 87 of cold start relay. Voltage should be 0 volts. If battery voltage is present, remove wiring harness connector from terminal 85 of the cold start relay.
  2. If voltage is now 0 volts, the thermotime switch is at fault and must be replaced. If battery voltage is still present at terminal 87 after disconnecting terminal 85, the cold start relay is faulty and must be replaced.
  3. If cold start injectors pass fuel when no voltage is present at terminal 87, the injectors must be replaced.
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