Toyota 22R-E Service Manual page 453

EG2–176
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
System
Malfunction
No.
Indicator
Lamp
Normal
RPM
Signal
RPM
Signal
Ignition
Signal
A/T
Control
Signal
Heated
Oxygen
Sensor
Signal
Engine
Coolant
Temp.
Sensor
Signal
Intake
Air
Temp.
Sensor
Signal
Air–Fuel
Ratio
Lean
Mal–
function
Air– Fuel
Ratio
Rich Mal–
function
ENGINE
*1
Mal–
function
Indicator
Diagnosis
Lamp
Test
Normal
Mode
Mode
Output when no other code is recorded.
No G or NE signal –is input to the ECM for 2
N.A.
secs.
or more after STA turns 4N.
NE signal is not input to ECM for 0.1 sec. or
more when engine speed is 1,000 rpm or
more.
IGF signal from igniter is not input to ECM for 6
N.A.
consecutive ignition.
N.A.
Normal signal is not output from ECM CPU.
(1) Open or short in heater circuit of heated
oxygen sensor for 0.5 sec. or more. (HT)
N.A.
(2) At normal driving speed (below 60 mph and
engine speed is above 1,500 rpm), amplitude
of heated oxygen sensor signal (OX) is
*7
reduced to between 0.35 – 0.70 V
continuously for 60 secs. or more.
ON
*6
(2 trip detection logic) (2)
Open or short in engine coolant temp. sensor
circuit for 0.5 sec. or more. (THW)
*3
Open or short in intake air temp. sensor circuit
ON
for 0.5 sec. or more. (THA)
(1) Heated oxygen sensor output is less than
0.45 V for at least 90 sacs. when heated
oxygen sensor is warmed up (racing at
2.000 rpm) and drive at 50 – 100 km/h
*4
(2) When the engine speed varies by more
than15 rpm over the preceding crankshaft
position period during a period of 50 seconds
during idling with the engine coolant temp.
75SC (167'F) or more.
*6
(2 trip detection logic) (1) and (2)
– MFI SYSTEM
Trouble Area
Open or short in NE, G 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
ECM
Open or short in heater circuit
of heated oxygen sensor
Heated oxygen sensor heater
ECM
Open or short in heated oxygen
sensor circuit
Heated 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
Engine ground bolt loose
Open in E1 circuit
Open in injector circuit
Fuel line pressure (Injector
blockage, etc. )
Open or short in heated
oxygen sensor circuit
Heated oxygen sensor
Ignition system
Engine coolant temp. sensor
Volume air flow meter (Air intake)
ECM
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 heated oxygen
sensor circuit
Heated oxygen sensor
Engine coolant temp. sensor
Volume air flow meter
Compression pressure
ECM
2
* See
Memory
Page
EG2–193
IG–1 6
EG2–195
EG2–199
EG2–192
EG2–190
EG2–197
EG2–199