Accord LX Coupe L4-2254cc 2.3L SOHC (VTEC) MFI (1998)
Alternator FR Signal: Testing and Inspection
1. Disconnect the ALT 4P connector.
2. Turn the ignition switch ON (II).
3. Measure voltage between ECM/PCM connector terminals B20 and C5.
Is there approx. 5 V?
YES-Go to step 4.
NO-Go to step 14.
4. Turn the ignition switch OFF.
5. Reconnect the ALT 4P connector.
6. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
7. Measure voltage between ECM/PCM connector terminals B20 and C5.
Does the voltage decrease when headlights and rear defogger are turned on?
YES-The ALT FR signal is OK.
NO-Go to step 8.
8. Turn the ignition switch OFF.
9. Disconnect the negative battery cable from the battery.
10. Disconnect the ECM/PCM connector C (31P).
11. Disconnect the ALT 4P connector.
12. Connect the ALT 4P connector terminal No.4 to body ground with a jumper wire.
13. Check for continuity between body ground and ECM/PCM connector terminal C5.