TOYOTA SUPRA 1986 Service Owner's Guide
Manufacturer: TOYOTA, Model Year: 1986, Model line: SUPRA, Model: TOYOTA SUPRA 1986Pages: 878, PDF Size: 20 MB
Page 31 of 878
DIAGNOSTIC TROUBLE CODE CHART
HINT: Parameters listed in the chart may not be exactly the same as your reading due to type of the instruments
or other factors.
DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Normal
G, NE Signal
(No.1)
G, NE Signal
(No.2)
Ignition Signal
A/T Control
Signal
No code is recorded
No ªNEº or ªG1º and ªG2º signal to ECM for 2 sec. or more after
cranking
No NE signal to ECM for 0.1 sec. or more at 1,000 rpm or
more
NE signal does not pulse 12 times to ECM during the interval
between G1 and G2 pulses
Deviation in G (G1, G2) and NE signal continues for 3 sec. dur-
ing idling (throttle fully closed) after engine warmed up
No IGF signal to ECM for 4~7 consecutive IGT signals with en-
gine speed less than 3,000 rpm
Fault in communications between the engine CPU and A/T CPU
in the ECM
EG±494± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 32 of 878
If a malfunction code is displayed during the diagnostic trouble code check in test mode, check the circuit for
that code listed in the table below (Proceed to the page given for that circuit).
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
±
±
±
±
±
Open or short in crankshaft position sensor, camshaft
position sensor No.1, No.2 circuit
Crankshaft position sensor
Camshaft position sensor No.1, No.2
Starter
ECM
ON
N.A.
EG±515
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
ECM
ON
N.A.
Open or short in crankshaft position sensor circuit
Mechanical system malfunction (skipping teeth of
timing belt, belt stretched)
Crankshaft position sensor
ECM
N.A.
ON
EG±518
Mechanical system malfunction (skipping teeth of
timing belt, belt stretched)
Camshaft position sensor No.1, No.2
ECM
ON
N.A.
Open or short in IGF circuit from igniter to ECM
Igniter
ECM
ON
N.A.
EG±519
ECM
ON
N.A.
X
EG±524
*1, 2: See page EG±502.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±495
Page 33 of 878
DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
(1) Open or short in heater circuit of main heated oxygen
sensor (Fr) for 0.5 sec. or more.
(2) Main heated oxygen sensor (Fr) signal voltage is reduced to
between 0.35 V and 0.70 V for 90 sec. under conditions
Main Heated
Oxygen Sensor
Signal(a) ~ (d):
(2 trip dectection logic)*3
(a) Engine coolant temp.: Between 80°C (176°F) and
95°C (203°F)
(b) Engine speed: 1,500 rpm or more
(c) Load driving (Example A/T in Overdrive, (5th for
M/T), A/C ON, Flat road, 80 km/h (50 mph)
(d) Main heated oxygen sensor signal voltage:
Alternating above and below 0.45 V
Open or short in engine coolant temp. sensor circuit for 0.5
sec. or more
Open or short in intake air temp. sensor circuit for 0.5 sec.
or more
(1) Main heated oxygen sensor voltage is 0.45 V or less (lean)
for 90 sec. under conditions (a) and (b):
(2 trip dectection logic)*3
(a) Engine speed: 1,500 rpm or more
(b) Engine coolant temp.: 70°C or more
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C (176°F) or more
(2 trip dectection logic)*4
(2) Engine speed varies by more than 20 rpm over the preced±
ing crank angle period during a period of 20 sec. or more
under conditions (a) and (b):
Intake Air
Temp. Sensor
Signal
Engine Coolant
Temp. Sensor
Circuit
Air±Fuel
Ratio Lean
Malfunction
*3: See page EG±503. EG±496
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 34 of 878
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
Open or short in heater circuit of main heated oxygen
sensor
Main heated oxygen sensor heater
ECM
ON
N.A.
Main heated oxygen sensor circuit
Mi h td
ON
ON
EG±525
Main heated oxygen sensor
ON
ON
Main heated oxygen sensor
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
ON
ON
EG±530
Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
ON
ON
EG±532
Open or short in Main heated oxygen sensor circuit
Oen or short in Main heated oxygen sensor circuit
Main heated oxygen sensor
Main heated oxygen sensor
Ignition system
gy
ECM
Open or short in injector circuit
Oen or short in injector circuit
Fuel linepressure (injector leak blockage) ON ON EG 534
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction (skipping teeth ofONONEG±534 Mechanical system malfunction (skipping teeth of
timing belt)
timing belt)
Ignition system
Ignition system
Compression pressure (foreign object caught in valve)
Compression pressure (foreign object caught in valve)
M i fl t (i itk)
Mass air flow meter (air intake)
ECM
ECM
*1, 2: See page EG±502
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±497
Page 35 of 878
DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C (176°F) or more
(2 trip dectection logic)*3
Engine speed varies by more than 20 rpm over the preceding
crank angle period during a period of 25 sec. or more
under conditions (a) and (b):
(1) Open or short in heater circuit of sub heated oxygen sensor
for 0.5 sec. or more
(2) Main heated oxygen sensor signal is 0.45 V or more and
sub heated oxygen sensor signal is 0.45 V or less under
conditions (a) ~ (c):
(2 trip dectection logic)*3
(a) Engine coolant temp.: 80°C (176°F) or more
(b) Engine speed: 1,5000 rpm or more
(c) Accel. pedal: Fully depressed for 2 sec. or more
Open or short in mass air flow meter circuit for 3 sec. or more
with engine speed less than 3,000 rpm
Open or short in turbo pressure sensor circuit for 0.5 sec. or
more
Open or short in BARO sensor circuit for 0.5 sec. or more
Sub Heated
Oxygen Sensor
Signal
Air±Fuel
Ratio Rich
Malfunction
Mass Air Flow
Meter Circuit
Turbo Pressure
Malfunction
Turbo Pressure
Sensor Circuit
Barometric
Pressure
Sensor Circuit
(c) Engine speed: 2,4000 rpm or more
(a) Mainfold absolute pressure: 200 kPa (2.0 kgf/cm2,
29 psi) or more
(b) Thottle valve opening angle: 20° or more
All conditions below are detected continuously for 2 sec. or more:
*3: See page EG±503. EG±498
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 36 of 878
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
Open or short in injector circuit
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction (skipping teeth of
timing belt)
Ignition system
Compression pressure (foreign object caught in valve)
Mass air flow meter (air intake)
ECM
ON
ON
EG±534
Open or short in heater circuit of sub heated oxygen
sensor.
Sub heated oxygen sensor
ECM
ON
N.A.
Open or short in sub heated oxygen sensor circuit
Sub heated oxygen sensor
ECM
ON
ON
EG±540
Open or short in mass air flow meter circuit
Mass air flow meter
ECM
ON
N.A.
EG±544
Actuator (for waste gate valve)
Short in VSV for waste gate valve circuit
ECM
ON
N.A.
EG±546
Open or short in turbo pressure sensor circuit
Turbo pressure sensor
ECM
ON
ON
EG±549
ECM
ON
ON
EG±549
*1, 2: See page EG±502.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±499
Page 37 of 878
DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
No starter signal to ECM
Open or short in throttle position sensor circuit for 0.5 sec. or
more
Engine control computer (for knock control) malfunction at
engine speed between 650 rpm and 5,200 rpm
(c) Park/neutral position switch: OFF
(d) Stop light switch: OFF
(a) No. 1 vehicle speed signal: 0 km/h (mph)
(b) Engine speed: 3,000 or more
All conditions below are detected continuously for 8 sec. or more:
(a) No. 1 vehicle speed signal: 0 km/h (mph)
(b) Engine speed: Between 1,500 rpm and 4,000 rpm
All conditions below are detected continuously for 8 sec. or more:
(c) Engine coolant temp.: 80°C (176°F) or more
(d) Load driving
Open or short in sub±throttle position sensor circuit for 0.5 sec.
or more
No No.2 knock sensor signal to ECM for 4 crank revolutions
with engine speed between 2,050 rpm and 5,950 rpm
No No.1 knock sensor signal to ECM for 4 crank revolutions
with engine speed between 2,050 rpm and 5,950 rpmKnock Sensor
Signal
(front side)
Knock Sensor
Signal
(rear side)
Knock Control
Signal
Sub±Throttle
Position Sensor
Signal
No. 1 Vehicle
Speed Sensor
Signal
(for A/T)
No. 1 Vehicle
Speed Sensor
Signal
(for M/T)
Starter Signal
Throttle Position
Sensor Signal
EG±500± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 38 of 878
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
ON
ON
EG±552
No.1 vehicle speed sensor
Telltale light RH
Open or short in No.1 vehicle speed sensor circuit
ECM
OFF
OFF
EG±556
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
N.A
OFF
X
EG±559
Open or short sub±throttle position sensor circuit
Sub±throttle position sensor
ECM
OFF
ON
EG±552
Open or short in No.1 knock sensor circuit
No.1 Knock sensor (loosensess)
ECM
ON
N.A
EG±561
ECM
ON
N.A
X
EG±561
Open or short in No.2 knock sensor circuit
No.2 Knock sensor (looseness)
ECM
ON
N.A
EG±561
*1,
2: See page EG±502.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±501
Page 39 of 878
DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
(a) Engine coolant temp.: 60°C (140°F) or more
(2 trip dectection logic)*3
(2 trip dectection logic)*3
(2 trip dectection logic)*3
EGR gas temp. and intake air temp. are 60°C (140°F) or less
for A/T, 55°C (131°F) or less for 1 ~ 4 min. under conditions
(a) and (b):
Fuel Pump
Control Signal
(2 trip dectection logic)*3
(b) EGR operation possible (Example A/T in 3rd speed (5th for
M/T), A/C ON, 96 km/h (60 mph), Flat road)
Switch Condition
Signal
EGR System
Malfunction
(2) Open in input circuit for 1 sec. or more with engine speed
1,000 rpm or less
(1) Open or short in fuel pump circuit for 1 sec. or more with
engine speed 1,000 rpm or less
(3) Open or short in diagnostic signal line (DI) fuel pump ECU
with engine speed 1,000 rpm or less
(1) 3 sec. or more after engine starts, with closed throttle posi±
tion switch OFF (IDL1)
(2) Park/neutral position switch: OFF
(Shift position in ''R'', ''D'', ''2'', or ''L'' position)
(3) A/C switch ON
*1: ºONº displayed in the diagnostic mode column indicates that the Malfunction Indicator Lamp is lit up when
a malfunction is defected. ºOFFº indicates that the ºCHECKº does not light up during malfunction diag±
nosis, even if a malfunction is detected. ºN.A.º indicates that the item is not included in malfunction diag±
nosis.
*2: ºº in the memory column indicates that a diagnostic trouble code is recorded in the ECM memory when
a malfunction occurs. ºXº indicates that a diagnostic trouble code is not recorded in the ECM memory even
if a malfunction occurs. Accordingly, output of diagnostic results in normal or test mode is done with the
IG switch ON. EG±502
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 40 of 878
Malfunction detection (1st time)
(temporarily recorded)Malfunction detection (2nd time)
(MIL lights up)
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
Open in EGR gas temp. sensor circuit
Short in VSV circuit for EGR
EGR hose disconnected, valve stuck
Clogged EGR gas passage
ECM
ON
ON
EG±564
Open or short in fuel pump ECU circuit
Fuel pump ECU
Fuel pump
ECM power source circuit
ECM
OFF
ON
EG±568
A/C switch circuit
Throttle position sensor IDL circuit
Park/neutral position switch circuit
Accelerator pedal and cable
ECM
N.A.
OFF
X
EG±571
*3: This indicates items for which º2 trip detection logicº is used. With this logic, when a logic malfunction is
first detected, the malfunction is temporarily stored in the ECM memory. If the same case is detected again
during the second drive test, this second detection causes the Malfunction Indicator Lamp to light up.
The 2 trip repeats the same mode a 2nd time. (However, the IG switch must be turned OFF between the
1st trip and 2nd trip).
In the Test Mode, the Malfunction Indicator Lamp lights up the 1st trip a malfunction is detected.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±503