## PGM-FI System

#### DTC Troubleshooting (cont'd)

11-240

9. Turn the ignition switch OFF.
10. Disconnect ECM/PCM connector A (31P).
11. Turn the ignition switch ON (II).
12. Block the right front wheel, and slowly rotate the left front wheel.
13. 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

1. Reset the ECM/PCM (see page 11-168).
2. Start the engine and keep engine speed at idle.
3. 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.

4. Turn the ignition switch OFF.
5. Start the engine and let it idle.
6. Measure voltage between ECM/PCM connector terminals A24 and E15.
7. 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.

8. Turn the ignition switch and headlights OFF.
9. Disconnect the ELD 3P connector.
10. Turn the ignition switch ON (II).