1995 TOYOTA SUPRA sensor
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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 1900 of 2543
DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Air±Fuel Ratio
Rich Malfunction
(1) Difference 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)*
4
(a) Engine speed: 2,000 rpm or more
(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 o 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
4
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C (140°F) and
95°C (203°F)
(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
oxygen sensor signal is 0.45 V or less under conditions (a) ~ (c):
(2 trip detection logic)*
4
(a) Engine coolant temp.: 80°C (176°F) or more
(b) Engine speed: 1,500 rpm or more
(c) Accel. pedal: Fully depressed for 2 sec. or more
(1)*3Open or short in heater circuit of main heated oxygen
sensor (Rr) for 0.5 sec. or more|
(2) (Main heated*3) oxygen sensor (Rr) signal voltage is
reduced to between 0.35 V and 0.70 V for 90 sec.
under conditions (a) ~ (d)
(2 trip detection logic)*
4
(b) 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*3) oxygen sensor (Rr) signal voltage:
Alternating above and below 0.45 V
Sub Heated
Oxygen Sensor
Signal
(Main heated*3)
Oxygen Sensor
Signal (Rr)
*3, 4: See page EG±396, 397 EG±392
± ENGINE2JZ±GE ENGINE TROUBLESHOOTING
Page 1901 of 2543
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 1902 of 2543
DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Volume Air
Flow Meter
Signal
Barometric
Pressure
Sensor Signal
Throttle Position
Sensor Signal
No.1 Vehicle
Speed Sensor
Signal
(for A/T)
No.1 Vehicle
Speed Sensor
Signal
(for A/T)
Starter Signal
Knock Sensor
Signal
(front side)
Knock Control
Signal
Knock Sensor
Signal (rear side)
All conditions below are detected:
(a) No volume air flow meter signal to ECM for 2 sec. when
engine speed is above 300 rpm
(b) Engine stall
Open or short in BARO sensor circuit for 0.5 sec. or more
Open or short in throttle position sensor circuit for 0.5 sec. 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: 3,000 rpm or more
(c) Park/neutral position switch: OFF
(d) Stop Light switch: OFF
All conditions below are detected continuously for 8 sec. or more:
(a) No.1 vehicle speed signal: 0 km/h (mph)
(b) Engine speed: 2,000 rpm and 5,000 rpm
(c) Engine coolant temp.: 80°C (176°F) or more
(d) Load driving
No starter signal to ECM
No. No.1 knock sensor signal to ECM for 4 crank revolutions
with engine speed between 1,600 rpm and 5,200 rpm
Engine control computer (for knock control) malfunction at en-
gine speed between 650 rpm and 5,200 rpm
No No.2 knock sensor signal to ECM for 4 crank revolutions with
engine speed between 1,600 rpm and 5,200 rpm
EG±394± ENGINE2JZ±GE ENGINE TROUBLESHOOTING
Page 1903 of 2543
Trouble Area
Malfunction
Indicator
Lamp*
1
Memory*2
See page
Trouble Area
Normal
Mode
Test
Mode
Memory
See page
Open or short in volume air flow meter circuit
Volume air flow meter
ECM
ON
N.A.
EG±438
ECM
ON
ON
EG±441
Open or short in throttle position sensor circuit
Throttle position sensor
ECM
ON
ON
EG±442
No.1 vehicle speed sensor
Telltale light RH
Open or short in No.1 vehicle speed sensor circuit
ECM
OFF
OFF
EG±445
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
N.A.
OFF
X
EG±448
Open or short in No.1 knock sensor circuit
No.1 knock sensor (looseness)
ECM
ON
N.A.
EG±450
ECM
ON
N.A.
X
EG±450
Open or short in No.2 knock sensor circuit
No.2 knock sensor (looseness)
ECM
ON
N.A.
EG±450
*1, 2: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±395
Page 1905 of 2543
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±453
Open or short in fuel pump ECU circuit
Fuel pump ECU
Fuel pump
ECM power source circuit
ECM
OFF
ON
EG±457
A/C switch circuit
Throttle position sensor IDL circuit
Park/neutral position switch circuit
Accelerator pedal and cable
ECM
N.A.
OFF
X
EG±460
*4: 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±GE ENGINE TROUBLESHOOTINGEG±397
Page 1907 of 2543
DTCCircuit
G, NE signal circuit (No.2)
Engine coolant temp. sensor
circuit
Intake air temp. sensor circuit
Throttle position sensor
circuit
CHECK FOR INTERMITTENT PROBLEMS
As described in the preceding paragraph, abnormality detection
ability in the test mode is increased compared to that in the normal
mode, so that when intermittent problems occur in the ECM signal
circuits (G1, G2, NE, THW, THA, VTA1) shown in the table below,
the appropriate diagnostic trouble code is output.
Accordingly, when the diagnostic trouble codes shown in the table
opposite (13, 22, 24, 41) are output during the diagnostic trouble
code check, and inspection of the appropriate circuits reveals no
abnormality, check for intermittent problems as described below.
By checking for intermittent problems, the place where intermittent
problems are occurring due to poor contacts can be isolated.
CLEAR DIAGNOSTIC TROUBLE CODES
See page EG±387.
SET TEST MODE
1. With the ignition switch OFF, using SST, connect the
terminals TE2 and E1 of the data link connector 2.
SST 09843±18020
2. Start the engine and check to see the malfunction indicator
lamp goes off.
PERFORM A SIMULATION TEST
Using the symptom simulation (See page IN±24), apply
vibration to and pull lightly on the wire harness, connector or
terminals in the circuit indicated by the malfunction code.
In this test, if the malfunction indicator lamp lights up, it indi-
cates that the place where the wire harness, connector or ter-
minals being pulled or vibrated has a faulty contact. Check
that point for loose connections, dirt on the terminals, poor fit
or other problems and repair as necessary.
HINT: After cancelling out the diagnostic trouble code in
memory and set the test mode, if the malfunction indicator
lamp does not go off after the engine is started, check thor-
oughly for faulty contacts, etc., then try the check again. If the
malfunction indicator lamp still does not go off, check and re-
place ECM.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±399
Page 1915 of 2543
REFERENCE VALUE OF ECM DATA
HINT: ECM data can be monitored by TOYOTA hand±held
tester.
1. Hook up the TOYOTA hand±held tester to DLC2.
2. Monitor ECM data by following the prompts on the tester
screen.
Please refer to the TOYOTA hand±held tester operator's manual
for further details.
REFERENCE VALUE
Item Inspection condition Reference value
INJECTOR
Engine cold to hot
Engine idling at normal operating temp.*1
Gradually decreases
Approx. 2.0 msec.
IGNITION Increase engine speed Gradually increases
IAC STEP #
Engine idling at normal operating temp.*1
A/C switch ON
A/T shifting in ºDº position
Ignition switch ON (Engine off)
20 ~ 25 steps
Step increases
Step increases
Approx. 125 steps
ENGINE SPEED RPM kept stable (Comparison with tachometer) No great changes
VA F
Engine idling at normal operating temp.*1
Increase engine speed
Approx. 35 ms
Gradually decreases
ECT Engine at normal operating temp. 75±95°C (185±203°F)*2
THROTTLE
Closed throttle position
Wide open throttle
From closed throttle position to wide open throttle
Below 5°
Above 70°
Gradually increases
VEHICLE SPD
During driving
(Comparison with speedometer)
No large differences
TARGET A/FL*5 Engine idling at normal operating temp. 2.50 + 1.25 V*3
TARGET A/FR*6 Engine idling at normal operating temp. 2.50 + 1.25 V*3
A/F FB LEFT*5 RPM stable at 2500 rpm with normal operating temp. ON
A/F FB RIGHT*6 RPM stable at 2500 rpm with normal operating temp. ON
KNOCK FB Depress throttle pedal suddenly during idling ON
STA SIGNAL During cranking ON
CTP SIGNAL Closed throttle position ON
A/C SIGNAL A/C switch ON ON
PNP SIGNAL*4 When shifting from ºPº or ºNº position into a position
other than ºPº or ºNº GEAR
O X L*5 RPM stable at 2500 rpm with normal operating temp. RICH LEAN is repeated O X R*6 RPM stable at 2500 rpm with normal operating temp. RICH LEAN is repeated
*1: If the engine coolant temp. sensor circuit is open or shorted, the ECM assumes an engine coolant temp.
value of 80
°C (176°F).
*
2: When feedback control is forbidden, 0 V is displayed.
*
3: A/T only
*
4: Oxygen sensor (Front)
*
5: Oxygen sensor (Rear)
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±407