Connect with us

Electronic

Tech Tip: Honda Engine Won’t Start? Check for Loose Alternator Bolts

If the alternator bolts are loose, tighten them and try restarting the engine. If the engine still won’t start, then check the ECM/PCM connector for battery voltage and ground. If you’re reading battery voltage and ground at the connector, then replace the ECM/PCM.

Advertisement

Applies to: 2001-’04 Honda Civic

Advertisement
Click Here to Read More
Advertisement

Got a 2001-’04 Civic in your shop with any or all of these symptoms?

• The engine cranks but it won’t start.

• The MIL comes on.

• The immobilizer indicator blinks while the ­engine cranks.

• The HDS can’t communicate with the ECM/PCM.

Check for loose alternator bolts. If these bolts are loose for any reason such as the alternator was R&R’ed, or an accessory A/C was installed on a DX model at the dealership, the alternator can overcharge and fry the ECM/PCM.

If the alternator bolts are loose, tighten them and try restarting the engine. If the engine still won’t start, then check the ECM/PCM connector for battery voltage and ground. If you’re reading battery voltage and ground at the connector, then replace the ECM/PCM. Keep in mind, though, any ECM/PCM damage that’s caused by loose alternator bolts from A/C installation or body repair isn’t covered under warranty.

Courtesy of Honda Service News via ALLDATA.

Advertisement
Click to comment

Loading Post...

Loading Post...

Loading Post...

Advertisement

POPULAR POSTS

A 360° Look Into the GM 60° 3.1L Engine

Tech Feature: Detecting Misfires in OBD II Engines

Wheel Speed Sensor Diagnostics for Meters and Scopes

Fuel Pump Diagnostics – Using Voltage Drops and Current Draw

Connect