Diagnostic Procedure 15 — Engine Stalls when Accelerating or when Driving at Constant Speed
EF & EC-278flowchartDiagnostic Procedure 15 — Engine Stalls when Accelerating or when Driving at Constant Speed
1
PERFORM POWER BALANCE TEST. 1. Perform "POWER BALANCE" in "ACTIVE TEST" mode. 2. Is there any cylinder which does not produce a momentary engine speed drop? — OR — When disconnecting each injector harness connector one at a time, is there any cylinder which does not produce a momentary engine speed drop?
Go to 4
Go to 4.
Yes
2
CHECK INJECTOR. 1. Remove distributor from engine. (Crank angle sensor harness connector should remain connected.) 2. Turn ignition switch ON. (Do not start engine.) 3. When rotating distributor shaft slowly by hand, does each injector make an operating sound?
No
Check injector(s) and circuit(s).
Yes
3
CHECK IGNITION SPARK. 1. Disconnect ignition wire from spark plug. 2. Connect a known good spark plug to the ignition wire. 3. Place end of spark plug against a suitable ground and crank engine. 4. Check for spark.
No
Check ignition coil, power transistor unit and circuits. (See page EF & EC-304.)
Yes
4
(Go to A on next page.)