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Test G - Coolant Temperature Gauge Inaccurate

  1. Perform coolant temperature gauge test. See COOLANT TEMPERATURE GAUGE  under COMPONENT TESTING. If temperature gauge is okay, go to next step. If temperature gauge tests bad, replace gauge if defective (1.8L) and retest system or go to next step (1.9L).
  2. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster connector C250 on vehicles without tachometer (C254 with tachometer). Measure resistance of Black/Green wire in cluster connector to ground. If resistance is more than 10 k/ohms on 1.8L, replace temperature sender unit and retest system. On 1.9L, go to next step. If resistance is less than 10 k/ohms, repair short in Black/Green wire and retest system.
  3. Disconnect cluster connector C250 on vehicles without tachometer (C254 with tachometer). Measure resistance of Black/Green wire between cluster connector and ground. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/Green wire and retest system.
  4. Disconnect cluster connector C250 on vehicles without tachometer (C254 with tachometer). Measure resistance between coolant temperature gauge clip "B" and coolant temperature gauge clip "S". Measure resistance between coolant temperature gauge clip "S" and coolant temperature gauge clip "G". If resistance is 190-232 ohms between "B" and "S", and 81-99 ohms between "S" and "G", replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. If resistances are not as specified, replace engine coolant temperature gauge and retest system.
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