Engine - Cranks But No Start, Immobilizer Light Blinks

Engine Cranks But Doesn't Start, Immobi Light Blinks

Revised 10/05/06

NOTE:
This article applies to '03-06 MDXs, '07 RDXs, '05-06 RLs, '02-06 RSXs, '04-06 TLs, and '04-06 TSXs.

If the starter motor cranks the engine, but the engine doesn't start, keep your eye on the immobilizer system indicator while the starter motor is engaged. If the indicator is blinking, the battery may be weak. A weak battery may have enough juice to turn the starter motor (it will turn with 9 to 10 volts), but not enough to power the other electrical systems, particularly the FCM/PCM.

To fix this problem, hook up a battery charger or a jumper battery and restart the engine. If the engine starts right up, or if the immobilizer system indicator blinks while the engine is running, then use the FD-18 battery tester to check the battery and an approved charging system tester such as the Sun VAT-40 or the Minuteman Plus Alternator, Regulator, Battery, Starter Tester (A.R.B.S.T.) to check the charging system. Make any needed repairs.

A weak battery can also cause an intermittent crank but no start problem with the immobilizer system indicator blinking. The starter motor may sound strong, but the FCM/PCM and the immobilizer system can't communicate. Use the FD-18 battery tester to check the battery