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HOMESERVICE MANUALSCHEVROLET1995SPORTVAN G20, 6.5 PREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 51 (ENGINE CONTROLS - TESTS W/CODES - 3.8L)TROUBLE CODE CHARTSCODE P0118, COOLANT TEMPERATURE SENSOR TEMPERATURE HIGHDIAGNOSTIC AIDS
1995 Chevrolet Sportvan G20, 6.5 P

Diagnostic Aids

1995 Chevrolet Sportvan G20, 6.5 PSECTION Diagnostic Aids
WARNING: This page is about a different car, the 1995 Pontiac Trans Sport, 1995 Oldsmobile Silhouette, and 1995 Chevrolet Lumina APV. However, it is still accessible from the selected car via links, so may be relevant.

Tech 1 displays engine temperature in degrees celsius (°C) and fahrenheit (°F). After engine is started, temperature should rise steadily to 194°F (90°C), then stabilize when thermostat opens. An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside insulation. Check the following for:

  • A short to ground in 5-volt reference circuit.
  • Intermittent Test

Using Tech 1, monitor engine coolant temperature while moving related connectors and wiring harness. If failure is induced, display will change. This may assist in isolating location of malfunction.

  • Shifted Sensor

    See TEMPERATURE-TO-RESISTANCE VALUES table to test ECT sensor at various temperature levels to evaluate the possibility of a shifted (mis-scaled) sensor which may result in driveability complaints.
TEMPERATURE-TO-RESISTANCE VALUES (1)

Temperature °F (°C) Ohms
212 (100) 177
194 (90) 241
158 (70) 467
104 (40) 1459
68 (20) 3520
23 (-5) 12,300
14 (-10) 16,180
0 (-18) 25,000
-4 (-20) 28,680
-22 (-30) 52,700
-40 (-40) 100,700
(1) Measure resistance across sensor terminals.
Fig 1: Code P0118 Schematic (3.8L FWD Van) Coolant Temperature Sensor Temperature High
G94E66070
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.