Pinpoint Test CB - Temperature Gauge Always Indicates Hot Or Cold Temperature
- Disconnect wiring from temperature sender, located on right side of engine near No. 1 fuel injector. Connect jumper wire between temperature sender harness connector terminals.
- Turn ignition on. Temperature gauge should indicate a short circuit by blinking thermometer symbol and by displaying top 2 and bottom 2 bars.
- If temperature gauge indicates a short circuit (CS), remove jumper wire and go to step 6). If temperature gauge does not indicate a short circuit, go to next step.
- Disconnect negative battery cable. Remove instrument cluster. See ELECTRONIC INSTRUMENT CLUSTER (EIC) under REMOVAL & INSTALLATION. With jumper wire connected at temperature sender wiring connector, check for continuity between connector C2-2 pin No. 21 (Red/White wire) and connector C2-1 pin No. 4 (Black/Light Blue wire). See Figure .
- If continuity exists, replace instrument cluster. If continuity does not exist, check Red/White wire to temperature gauge and temperature gauge ground circuit for an open.
- Warm engine to normal operating temperature. Measure resistance between terminals of temperature sender. If resistance is less than 8000 ohms, replace instrument cluster. If resistance is greater than 8000 ohms, go to next step.
- Inspect thermostat, coolant level, etc., for proper operation. If cooling system components are defective, repair as necessary. If all cooling system components are okay, replace temperature sender.