LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Dodge and Ram >> 1994 >> Caravan Base, 2.5 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Body Control Computer >> Self-Diagnostic Tests >> Test 6A - EIC Repairing Temperature Gauge Problems
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Test 6A - EIC Repairing Temperature Gauge Problems

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  in this article. For wiring diagrams, see WIRING DIAGRAMS  .
CAUTION: Always turn ignition off prior to disconnecting or connecting any module connector.
  1. Ensure cooling system is operating properly. If cooling system is not operating properly, repair as needed. Perform TEST VER-1B  . If cooling system is operating properly, go to next step.
  2. Using DRB, read engine temperature sensor voltage. If voltage is more than 10 volts, go to step 6). If voltage is less than 10 volts, go to next step.
  3. Disconnect Engine Coolant Temperature (ECT) sensor connector. Check, clean and repair connections as needed. Using DRB, read ECT sensor voltage. If voltage is more than 10 volts, replace ECT sensor. Perform TEST VER-1B. If voltage is less than 10 volts, go to next step.
  4. Turn ignition off. Gain access to Body Control Module (BCM), located under left side of instrument panel. Disconnect BCM connectors. Turn ignition on. Using DRB in voltmeter mode, measure voltage of fused ignition feed circuit at Blue BCM connector terminal No. 12 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire between BCM and splice. Perform TEST VER-1B. If voltage is more than 10 volts, go to next step.
  5. Turn ignition off. Using DRB in ohmmeter mode, check resistance of ECT sensor signal circuit at Natural BCM connector terminal No. 23 (Violet/Yellow wire). If resistance is more than 5 ohms, replace BCM. Perform TEST VER-1B. If resistance is less than 5 ohms, repair Violet/Yellow wire for short to ground. Perform TEST VER-1B  .
  6. Disconnect ECT sensor connector. Check and clean connections. Connect a jumper wire between ECT sensor connector (Violet/Yellow wire) and ground. Using DRB in voltmeter mode, read ECT sensor voltage. If voltage is less than one volt, replace ECT sensor. Perform TEST VER-1B. If voltage is more than one volt, go to next step.
  7. Disconnect jumper wire. Gain access to Body Control Module (BCM), located under left side of instrument panel. Connect jumper wire between ECT sensor signal circuit at Natural BCM connector terminal No. 23 (Violet/Yellow wire) and ground. Using DRB, read ECT sensor voltage. If voltage is less than one volt, repair open Violet/Yellow wire. Perform TEST VER-1B. If voltage is more than one volt, go to next step.
  8. Disconnect jumper wire. Disconnect Blue BCM connector. Check, clean and repair connections as needed. Perform TEST VER-1B. If connections are okay, replace BCM. Perform TEST VER-1B.
scientia non olet · About LEMON Manuals