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Symptom Matrix Chart
NHEC0041
SYSTEM — BASIC ENGINE CONTROL SYSTEM
NHEC0041S01
SYMPTOM
Reference
page
HARD/NO START/RESTART (EXCP. HA)
ENGINE STALL
HESITATION/SURGING/FLAT SPOT
SPARK KNOCK/DETONATION
LACK OF POWER/POOR ACCELERATION
HIGH IDLE/LOW IDLE
ROUGH IDLE/HUNTING
IDLING VIBRATION
SLOW/NO RETURN TO IDLE
OVERHEATS/WATER TEMPERATURE HIGH
EXCESSIVE FUEL CONSUMPTION
EXCESSIVE OIL CONSUMPTION
BATTERY DEAD (UNDER CHARGE)
Warranty symptom code AA AB AC AD AE AF AG AH AJ AK AL AM HA
Fuel Fuel pump circuit 11232 2 2 3 2EC-618
Fuel pressure regulator system 3344444 4 4 4 EC-50
Injector circuit 11232 2 2 2 EC-608
Evaporative emission system
33
44444 4 4 4
EC-32
Air Positive crankcase ventilation sys-
tem
1 EC-47
Incorrect idle speed adjustment 1 1 1 1 1 EC-109
IACV-AAC valve circuit 1123322 2 2 2 2EC-429
Ignition Incorrect ignition timing adjustment 33111 1 1 1 EC-109
Ignition circuit 1 1 2 2 2 2 2 2 EC-506
Main power supply and ground circuit
22333 3 3
2
3
EC-145
Air conditioner circuit 3 3 2 HA section
1 - 6: The numbers refer to the order of inspection.
(continued on next page)
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Symptom Matrix Chart
EC-123
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