Diagnostic Trouble Codes - Toyota 22R-E Service Manual

EG1–114

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.
Number of
blinks
Code
Malfunction System
No.
Indicator
Lamp
Normal
RPM
Signal
RPM
Signal
Ignition
Signal
Main
Oxygen
Sensor
Signal
Engine
Coolant
Temp.
Sensor
Signal
Intake
Air
Temp.
Sensor
Signal
Air–Fuel
Ratio
Lean
Mal–
function
Air–Fuel
*5
Ratio
26
Rich Mal–
function
ENGINE
MIL
Diagnosis
No trouble code is recorded.
No NE signal is input to the ECM for 2 secs.
or more after STA turns ON.
NE signal is not input to ECM for 300
msec. or more when engine speed is 1,500
rpm or more.
IGF signal from igniter is not input to ECM
for 4 consecutive ignition.
(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)
Open or short in engine coolant temp.
sensor circuit for 500 msec. or more. (THW)
Open or short in intake air temp. sensor
'3
circuit for 500 rnsec. or more. (THA)
ON
(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)
– MFI SYSTEM
Trouble Area
Open or short in NE circuit
Distributor
Open or short in STA circuit
ECM
Open or short in NE circuit
Distributor
ECM
Open or short in IGF or IGT
circuit from igniter to ECM
Igniter
ECM
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 engine
coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
Open or short in intake air
temp. circuit
Intake air temp. sensor
ECM
S Engine ground bolt loose
S Open in E1 circuit
S Open in injector circuit
S Fuel line pressure (Injector
blockage, etc.)
S Open or short in oxygen
sensor circuit
S Oxygen sensor
S Ignition system
S Engine coolant temp. sensor
S Volume air flow meter
(Air intake)
S ECM
S Engine ground bolt loose
S Open in E1 circuit
S Short in injector circuit
S Fuel line pressure (injector
leakage, etc. )
S Open or short in cold start
S injector circuit
S Cold start injector
S Open or short in oxygen
sensor circuit
S Oxygen sensor
S Engine coolant temp. sensor
S Volume air flow meter
S Compression pressure
S ECM
See
*2
Page
Memory
IG–4
EG1–132
EG1–150
EG1–168
IG–4
EG1–134
EG1–152
EG1–170
EG1–138
EG1–156
EG1–174
EG1–131
EG1–149
EG1–167
EG1–129
EG1–147
EG1–165
EG1–138
EG1–156
EG1–174.
EG1–136
EG1–154
EG1–172