1986 TOYOTA SUPRA belt
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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 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 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 55 of 878
DTC 13 G NE Signal Circuit (No.2)
CIRCUIT DESCRIPTION
Refer to G, NE signal circuit (No.1) on page EG±515
DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area
No NE signal to ECM for 0.1 sec. or more at
1,000 rpm or more
Open or short in crankshaft position
sensor circuit
Crankshaft position sensor
ECM
13
NE signal does not pulse 12 times to ECM
during the interval between G1 and G2 pulses
Open or short in crankshaft position
sensor circuit
Mechanical system malfunction (skipping
teeth of timing belt, belt stretched)
Crankshaft position sensor
ECM
Deviation in G (G1, G2) and NE signal
Continues for 3 sec. during idling
throttle fully closed after engine warmed up
Mechanical system malfunction (skipping
teeth of timing belt, belt stretched)
Camshaft position sensor No. 1, No.2
ECM
INSPECTION PROCEDURE
Inspect sensor installation. Check if any teeth of NE signal plate are broken.
Tighten sensor.
Replace timing rotor.
Adjust valve timing (repair or replace timing belt).
Check valve timing (Check for loose and jumping teeth of timing belt
(See page EG±33)).
Check for intermittent problems.
(See page EG±505)
EG±518± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 71 of 878
DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
CIRCUIT DESCRIPTION
See EG±525 for the circuit description.
DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area
(1) Main heated oxygen sensor voltage is
0.45 V or less (lean) for 90 sec. under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine coolant temp.: 70°C (158°F)
or more
(b) Engine speed: 1,500 rpm or more
Open or short in main heated oxygen
sensor circuit
Main heated oxygen sensor
Ignition system
ECM
25
(2) 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):
(2 trip detection logic).*
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C
(176°F) or
more
Open and 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
26
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):
(2 trip detection logic).*
(a) Engine speed: Below 950 rpm
(b) Engine coolant temp.: 80°C
(176°F) or
more
Open and 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
*: See page EG±503. EG±534
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING
Page 147 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 engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
ON
ON
EG±424
Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
ON
ON
EG±426
Open or short in (main heated*3) oxygen sensor circuit
(Main heated*3) oxygen sensor
Ignition system
ECM
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)
Volume air flow meter (air intake)
ECM
ON
ON
EG±428
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)
Volume air flow meter (air intake)
ECM
*1, 2, 3: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±391
Page 149 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)
Volume air flow meter (air intake)
ECM
ON
ON
EG±428
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)
Volume air flow meter (air intake)
ECM
ON
ON
EG 428
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±434
Open or short in heater circuit of main heated oxygen sensor (Rr)
Main heated oxygen sensor (Rr) heater
ECM
ON
N.A.
(Main heated*3) oxygen sensor (Rr) circuit
(Main heated*3) oxygen sensor (Rr)
ON
ON
EG±419
*1, 2, 3: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±393
Page 184 of 878
CIRCUIT DESCRIPTION
See page EG±419 for the circuit description
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
(1) (Main heated*1) oxygen sensor voltage is
0.45 V or less (lean) for 90 sec. under codi±
tions (a) and (b):
(2 trip detection logic)*
2
(a) Engine coolant temp.: 70°C (158°F)
or more
(b) Engine speed: 1,500 rpm or more
(2)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(1)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(3)*1Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(2) Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
*1: Only for California specification vehicles
*
2: See page EG±397.
Open or short in (main heated*1) oxygen
sensor circuit
(Main heated*
1) oxygen sensor
Ignition system
ECM
Open and 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)
Volume air flow meter (air intake)
ECM
Open and 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)
Volume air flow meter (air intake)
ECM
Open and 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)
Volume air flow meter (air intake)
ECM
Open and 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)
Volume air flow meter (air intake)
ECM
DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
EG±428± ENGINE2JZ±GE ENGINE TROUBLESHOOTING