DIAGNOSTIC TROUBLE CODES
HINT:
• If a malfunction is detected during the diagnostic trouble code check, refer to the circuit indicated in the
table, and turn to the corresponding page.
• Your readings may vary from the parameters listed in the table, depending on the instruments used.
(1) Oxygen sensor output is less than 0.45
V for at least 90 secs. when oxygen
sensor is warmed up (racing at 2,000
rpm). –Only for code 25.
*4
(2) When the air–fuel compensation value
fluctuates more than 20% from the
ECM set range within 60 secs. period
while driving at 15 km/h (9 mph) or
more at coolant temp. of 70°C (158°F )
or above.
*6 (2 trip detection logic) (1) and (2)
Engine ground bolt loose
Open in E1 circuit
Short in injector circuit
Fuel line pressure (injector
leakage, etc. )
Open or short in cold start
injector circuit
Cold start injector
Open or short in oxygen
sensor circuit
Oxygen sensor
Engine coolant temp. sensor
Volume air flow meter
Compression pressure
ECM
Engine ground bolt loose
Open in E1 circuit
Open in injector circuit
Fuel line pressure (Injector
blockage, etc.)
Open or short in oxygen
sensor circuit
Oxygen sensor
Ignition system
Engine coolant temp. sensor
Volume air flow meter
(Air intake)
ECM
(1) Open or short in heater circuit of main oxy–
gen sensor for 500 msec. or more. (HT)
(2) At normal driving speed (below 60 mph and
engine speed is above 1,700 rpm),
amplitude of main oxygen sensor signal
(OX 1) is reduced to between 0.35–0.70
V continuously for 60 secs. or more.
*6 (2 trip detection logic) (2)
NE signal is not input to ECM for 300
msec. or more when engine speed is 1,500
rpm or more.
Open or short in intake air temp. sensor
circuit for 500 rnsec. or more. (THA)
• Open or short in heater circuit
of main oxygen sensor
• Main oxygen sensor heater
• ECM
• Open or short in main oxygen
sensor circuit
• Main oxygen sensor
• ECM
• Open or short in NE circuit
• Distributor
• Open or short in STA circuit
• ECM
• Open or short in engine
coolant temp. sensor circuit
• Engine coolant temp. sensor
• ECM
• Open or short in IGF or IGT
circuit from igniter to ECM
• Igniter
• ECM
• Open or short in intake air
temp. circuit
• Intake air temp. sensor
• ECM
Open or short in engine coolant temp.
sensor circuit for 500 msec. or more. (THW)
No NE signal is input to the ECM for 2 secs.
or more after STA turns ON.
IGF signal from igniter is not input to ECM
for 4 consecutive ignition.
• Open or short in NE circuit
• Distributor
• ECM
Number of
blinks
Malfunction
Indicator
Lamp
EG1–138
EG1–156
EG1–174.
EG1–136
EG1–154
EG1–172
No trouble code is recorded.
Air–Fuel
Ratio
Lean
Mal–
function
Engine
Coolant
Temp.
Sensor
Signal
Air–Fuel
Ratio
Rich Mal–
function
Intake
Air
Temp.
Sensor
Signal
Main
Oxygen
Sensor
Signal
IG–4
EG1–132
EG1–150
EG1–168
EG1–131
EG1–149
EG1–167
EG1–138
EG1–156
EG1–174
EG1–134
EG1–152
EG1–170
EG1–129
EG1–147
EG1–165
Trouble Area
Ignition
Signal
*2
Memory
RPM
Signal
RPM
Signal
Diagnosis
See
Page
Code
No.
System
Normal
’3
ON
*5
26
MIL
IG–4
–ENGINE MFI SYSTEM
EG1–114
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