timing belt TOYOTA SUPRA 1986 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1986, Model line: SUPRA, Model: TOYOTA SUPRA 1986Pages: 878, PDF Size: 20 MB
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 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
Page 394 of 878
VALVE CLEARANCE INSPECTION AND
ADJUSTMENT (2JZ±GE)
HINT: Inspect and adjust the valve clearance when the en-
gine is cold.
1. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY
(See steps 1 to 9 in injector removal in SFI System)
2. DISCONNECT HIGH±TENSION CORDS FROM
CYLINDER HEAD COVERS
(See high±tension cords and cord clamps removal in
Ignition System)
3. REMOVE NO.3, NO.1 AND NO.2 CYLINDER HEAD
COVERS
(a) Remove the 4 bolts, 4 nuts and No.3 cylinder head cover.
(b) Remove the 4 bolts, No.1 cylinder head cover and gasket.
(c) Remove the 4 bolts, No.2 cylinder head cover and gasket.
4. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with timing
mark ºOº of the No.1 timing belt cover.
NOTICE: Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pulleys
are aligned with the timing marks of the No.4 timing belt
cover.
If not, turn the crankshaft 1 revolution (360°).
5. INSPECT VALVE CLEARANCE
(a) Check only those valves indicated in the illustration.
wUsing a feeler gauge, measure the clearance between
the valve lifter and camshaft.
wRecord the valve clearance measurements of those that
are out of specification. They will be used later to
determine the required replacement adjusting shim.
± ENGINEENGINE MECHANICALEG±11
Page 395 of 878
Valve clearance (Cold):
Intake
.15±0.25 mm (0.006±0.010 in.)
Exhaust
.25±0.35 mm (0.010±0.014 in.)
(b) Turn the crankshaft pulley 1 revolution (360°), and align the
groove with timing mark ºOº of the No.1 timing belt cover.
(c) Check only the valves indicated as shown. Measure the valve
clearance. (See procedure in step (a))
6. ADJUST VALVE CLEARANCE
(a) Remove the adjusting shim.
wTurn the camshaft so that the cam lobe for the valve to
be adjusted faces up.
wTurn the valve lifter with a screwdriver so that the
notches are perpendicular to the camshaft.
wUsing SST (A), hold the camshaft as shown in the
illustration.
SST 09248±55040 (09248±05410)
wUsing SST (A), press down the valve lifter and place
SST (B) between the camshaft and valve lifter. Remove
SST (A).
SST 09248±55040 (09248±05410, 09248±05420)
HINT:
wApply SST (B) at slight angle on the side marked with
º7º, at the position shown in the illustration. EG±12
± ENGINEENGINE MECHANICAL