Turn the ignition switch OFF. Disconnect ECM/PCM connector A (31P). Turn the ignition switch ON (II). Block the right front wheel, and slowly rotate the left front wheel. Measure voltage between the ECM/PCM connector terminals A18 and A24. ECM/PCM CONNECTOR A (31P) Wire side of female terminals Does the voltage pulse between 0 V and 5 V (or battery voltage)? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Check these items: A short or an open in the wire between the ECM/PCM (A18) and the VSS. If the wire is OK, test the VSS (see page 22-94).

DTC 20: ELD Circuit Malfunction Reset the ECM/PCM (see page 11-168). Start the engine and keep engine speed at idle. Turn the headlights on. Does the MIL indicate DTC 20? YES - Go to step 4. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires the at ELD and at the ECM/PCM. Turn the ignition switch OFF. Start the engine and let it idle. Measure voltage between ECM/PCM connector terminals A24 and E15. While measuring voltage between ECM/PCM connector terminals A24 and E15, turn the headlights on (low). ECM/PCM CONNECTORS Wire side of female terminals Does the voltage drop when the headlights are turned on? YES - Substitute a known-good ECM/PCM and recheck. If symptom/indication goes away, replace the original ECM/PCM. NO - Go to step 8. Turn the ignition switch and headlights OFF. Disconnect the ELD 3P connector. Turn the ignition switch ON (II).