TROUBLE DIAGNOSIS — GENERAL DESCRIPTION; Symptom Matrix Chart — System: Engine Control System
EF & EC-7056spec tableSymptom Matrix is a 2D matrix; flattened to columns keyed by warranty-symptom code (AA-HA). Empty cells mean no listed inspection priority.
Symptom Matrix Chart
CG10, CGA3
SYSTEM — ENGINE CONTROL SYSTEM
Symptom Matrix Chart — Engine Control System
Fuel
ItemFuel pump circuit
AA — HARD/NO START/RESTART (EXCP. HA)1
AB — ENGINE STALL1
AC — HESITATION/SURGING/FLAT SPOT2
AD — SPARK KNOCK/DETONATION3
AE — LACK OF POWER/POOR ACCELERATION2
AF — HIGH IDLE/LOW IDLE
AG — ROUGH IDLE/HUNTING2
AH — IDLING VIBRATION2
AJ — SLOW/NO RETURN TO IDLE
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION3
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)2
Reference pageEC-7236
Fuel
ItemFuel pressure regulator system
AA — HARD/NO START/RESTART (EXCP. HA)3
AB — ENGINE STALL3
AC — HESITATION/SURGING/FLAT SPOT4
AD — SPARK KNOCK/DETONATION4
AE — LACK OF POWER/POOR ACCELERATION4
AF — HIGH IDLE/LOW IDLE4
AG — ROUGH IDLE/HUNTING4
AH — IDLING VIBRATION4
AJ — SLOW/NO RETURN TO IDLE4
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION4
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7025
Fuel
ItemInjector circuit
AA — HARD/NO START/RESTART (EXCP. HA)1
AB — ENGINE STALL1
AC — HESITATION/SURGING/FLAT SPOT2
AD — SPARK KNOCK/DETONATION3
AE — LACK OF POWER/POOR ACCELERATION2
AF — HIGH IDLE/LOW IDLE
AG — ROUGH IDLE/HUNTING2
AH — IDLING VIBRATION2
AJ — SLOW/NO RETURN TO IDLE
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION2
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7166
Fuel
ItemEvaporative emission system
AA — HARD/NO START/RESTART (EXCP. HA)3
AB — ENGINE STALL3
AC — HESITATION/SURGING/FLAT SPOT4
AD — SPARK KNOCK/DETONATION4
AE — LACK OF POWER/POOR ACCELERATION4
AF — HIGH IDLE/LOW IDLE4
AG — ROUGH IDLE/HUNTING4
AH — IDLING VIBRATION4
AJ — SLOW/NO RETURN TO IDLE4
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION4
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7021
Air
ItemPositive crankcase ventilation system
AA — HARD/NO START/RESTART (EXCP. HA)3
AB — ENGINE STALL3
AC — HESITATION/SURGING/FLAT SPOT4
AD — SPARK KNOCK/DETONATION4
AE — LACK OF POWER/POOR ACCELERATION4
AF — HIGH IDLE/LOW IDLE4
AG — ROUGH IDLE/HUNTING4
AH — IDLING VIBRATION4
AJ — SLOW/NO RETURN TO IDLE4
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION4
AM — EXCESSIVE OIL CONSUMPTION1
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7023
Air
ItemIncorrect idle speed adjustment
AA — HARD/NO START/RESTART (EXCP. HA)3
AB — ENGINE STALL3
AC — HESITATION/SURGING/FLAT SPOT
AD — SPARK KNOCK/DETONATION
AE — LACK OF POWER/POOR ACCELERATION
AF — HIGH IDLE/LOW IDLE1
AG — ROUGH IDLE/HUNTING1
AH — IDLING VIBRATION1
AJ — SLOW/NO RETURN TO IDLE1
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION1
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7027
Air
ItemIACV-AAC valve circuit
AA — HARD/NO START/RESTART (EXCP. HA)1
AB — ENGINE STALL1
AC — HESITATION/SURGING/FLAT SPOT2
AD — SPARK KNOCK/DETONATION3
AE — LACK OF POWER/POOR ACCELERATION3
AF — HIGH IDLE/LOW IDLE2
AG — ROUGH IDLE/HUNTING2
AH — IDLING VIBRATION2
AJ — SLOW/NO RETURN TO IDLE2
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION2
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)2
Reference pageEC-7200
Ignition
ItemIncorrect ignition timing adjustment
AA — HARD/NO START/RESTART (EXCP. HA)3
AB — ENGINE STALL3
AC — HESITATION/SURGING/FLAT SPOT1
AD — SPARK KNOCK/DETONATION1
AE — LACK OF POWER/POOR ACCELERATION1
AF — HIGH IDLE/LOW IDLE
AG — ROUGH IDLE/HUNTING1
AH — IDLING VIBRATION1
AJ — SLOW/NO RETURN TO IDLE
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION1
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7027
Ignition
ItemIgnition circuit
AA — HARD/NO START/RESTART (EXCP. HA)1
AB — ENGINE STALL1
AC — HESITATION/SURGING/FLAT SPOT2
AD — SPARK KNOCK/DETONATION2
AE — LACK OF POWER/POOR ACCELERATION2
AF — HIGH IDLE/LOW IDLE
AG — ROUGH IDLE/HUNTING2
AH — IDLING VIBRATION2
AJ — SLOW/NO RETURN TO IDLE
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION2
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)
Reference pageEC-7228
ItemMain power supply and ground circuit
AA — HARD/NO START/RESTART (EXCP. HA)2
AB — ENGINE STALL2
AC — HESITATION/SURGING/FLAT SPOT3
AD — SPARK KNOCK/DETONATION3
AE — LACK OF POWER/POOR ACCELERATION3
AF — HIGH IDLE/LOW IDLE
AG — ROUGH IDLE/HUNTING3
AH — IDLING VIBRATION3
AJ — SLOW/NO RETURN TO IDLE
AK — OVERHEATS/WATER TEMPERATURE HIGH2
AL — EXCESSIVE FUEL CONSUMPTION3
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)2
Reference pageEC-7071
ItemAir conditioner circuit
AA — HARD/NO START/RESTART (EXCP. HA)2
AB — ENGINE STALL2
AC — HESITATION/SURGING/FLAT SPOT3
AD — SPARK KNOCK/DETONATION3
AE — LACK OF POWER/POOR ACCELERATION3
AF — HIGH IDLE/LOW IDLE3
AG — ROUGH IDLE/HUNTING3
AH — IDLING VIBRATION3
AJ — SLOW/NO RETURN TO IDLE3
AK — OVERHEATS/WATER TEMPERATURE HIGH
AL — EXCESSIVE FUEL CONSUMPTION3
AM — EXCESSIVE OIL CONSUMPTION
HA — BATTERY DEAD (UNDER CHARGE)2
Reference pageHA section
NOTE
Warranty symptom codes are listed across the top: AA / AB / AC / AD / AE / AF / AG / AH / AJ / AK / AL / AM / HA.
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
See also
EC-7021 · EC-7023 · EC-7025 · EC-7027 · EC-7071 · EC-7166 · EC-7200 · EC-7228 · EC-7236