Fuel and Emissions Systems Symptom Troubleshooting - Engine stalls Diagnostic interview

Engine stalls?Diagnostic interview

Date

Place

1. Accessories/modifications

A: No modification

B: Modified

2. Situation when occurred

Booming noise, vibration occurs when deceleration, stopping, engine stalls

3. Situation when occurred

Engine stalls without vibrations as if stopped by turning off the ignition switch

Engine stalls condition?Possible cause pattern chart from diagnostic interview

Conditions when the engine stalls

Possible causes

Pattern 1

Accessories/modifications

''Hard to start engine'' or ''engine stall'' sometimes occurs due to a fault in the ignition system, intake duct, intake manifold, or exhaust system.
(Intermittent failure may occur due to modification)

Pattern 2

Booming noise, vibration occurs when deceleration, stopping, engine stalls

The following intermittent failures may exist.

	Intermittent failure of PGM-FI main relay 2
	Faulty fuel supply (parameter ST FUEL TRIM)
	Delay of EGR function (parameter EGR) (only vehicles with EGR)
	Delay of VTEC, VTC system function (parameter VTEC) (only vehicles with VTEC or VTC)
	Delay of lock up operation (parameter SLIP RATIO OF TORQ OR STARTCLUTCH) (AT, CVT vehicles)

Pattern 3

Engine stalls without vibrations as if turning off the ignition switch

The following intermittent failures may exist.

	Intermittent failure of ignition coil relay
	Intermittent failure of PGM-FI main relay 1
	Intermittent failure of PGM-FI subrelay
	Intermittent failure of ETCS control relay