TOYOTA SUPRA 1995 Service Repair Manual

C. Inspect VSV operation
(a) Check that air does not flow from port E to F.
(b) Apply battery voltage across the terminals.
(c) Check that air flows from port E to F.
If operation is not as specified, replace the VSV.
3. REINSTALL VSV
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
± ENGINESFI SYSTEM (2JZ±GTE)EG±311

ECT SENSOR INSPECTION
1. DRAIN ENGINE COOLANT
2. REMOVE ECT SENSOR
(a) Disconnect the ECT sensor connector.
(b) Using SST, remove the ECT sensor and gasket.
SST 09205±76030
3. INSPECT ECT SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance:
Refer to the graph
If the resistance is not as specified, replace the ECT sensor.
4. REINSTALL ECT SENSOR
(a) Install a new gasket to the ECT sensor.
(b) Using SST, install the ECT sensor.
SST 09205±76030
(c) Connect the ECT sensor connector.
5. REFILL WITH ENGINE COOLANT EG±312
± ENGINESFI SYSTEM (2JZ±GTE)

EGR GAS TEMPERATURE SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
EGR GAS TEMPERATURE SENSOR
INSPECTION
1. REMOVE EGR GAS TEMPERATURE SENSOR
2. INSPECT EGR GAS TEMPERATURE SENSOR
Using an ohmmeter, measure the resistance between the ter-
minals.
Resistance:
At 50°C (112°F)
64±97 k

At 100°C (212°F)
11±16 k

At 150°C (302°F)
2±4 k

If the resistance is not as specified, replace the sensor.
Torque: 20 NVm (200 kgfVcm, 14 ftVlbf)
3. REINSTALL EGR GAS TEMPERATURE SENSOR
± ENGINESFI SYSTEM (2JZ±GTE)EG±313

TURBO PRESSURE SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
TURBO PRESSURE SENSOR
INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF TURBO
PRESSURE SENSOR
(a) Disconnect the turbo pressure sensor connector.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, measure the voltage between connector
terminals VC and E2 of the wiring harness side.
Voltage:
4.5±5.5 V
(d) Turn the ignition switch OFF.
(e) Reconnect the turbo pressure sensor connector. EG±314
± ENGINESFI SYSTEM (2JZ±GTE)

2. INSPECT SUPPLY POWER OF TURBO PRESSURE
SENSOR
(a) Disconnect the ECM from the ECU bracket.
(See steps 1 to 4 in ECM)
(b) Install SST (check harness) between the ECM and wiring
connectors.
(See standard value of ECM terminals in Engine Trouble-
shooting)
SST 09990±01000
(c) Turn the ignition switch ON.
(d) Disconnect the vacuum hose from the turbo pressure sensor.
(e) Connect a voltmeter to terminals PIM and E2 of the ECM, and
measure the output voltage under ambient atmospheric
pressure.
(f) Apply vacuum to the turbo pressure sensor in 13.3 kPa (100
mmHg, 3.94 in.Hg) segments to 66.7 kPa (500 mmHg, 19.69
in.Hg).
(g) Measure the voltage drop from step (c) above for each
segment.
Voltage drop
 
 
 
 
 
Applied
Vacuum
kPa
(mmHg)
(in.Hg.) 
 
 
 
 
13.3
(100)
(3.94)
 
 
 
 
 
26.7
(200)
(7.87)
 
 
 
 
 
40.0
(300)
(11.81)
 
 
 
 
 
53.3
(400)
(15.75)
 
 
 
 
 
66.7
(500)
(19.69)
 
 
Voltage
drop V 
 
0.15±
0.35 
 
0.4±
0.6 
 
0.65±
0.85 
 
0.9±
1.1 
 
1.15±
1.35
(h) Remove the SST.
SST 09990±01000
(i) Reinstall the ECM. (See steps 6 to 9 in ECM)
(j) Reconnect the vacuum hose to the turbo pressure sensor.
± ENGINESFI SYSTEM (2JZ±GTE)EG±315

KNOCK SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±316± ENGINESFI SYSTEM (2JZ±GTE)

KNOCK SENSORS INSPECTION
1. REMOVE THROTTLE BODY
(See throttle body removal)
2. REMOVE STARTER
(See starter removal in Starting System)
3. REMOVE KNOCK SENSORS
(a) Disconnect the knock sensor connector.
(b) Using SST, remove the knock sensor.
SST 09816±30010
4. INSPECT KNOCK SENSORS
Using an ohmmeter, check that there is no continuity be-
tween the terminal and body.
If there is continuity, replace the sensor.
5. REINSTALL KNOCK SENSORS
(a) Using SST, install the knock sensor.
SST 09816±30010
Torque: 44 NVm (450 kgfVcm, 33 ftVlbf)
(b) Connect the knock sensor connector.
6. REINSTALL STARTER
(See starter installation in Starting System)
7. REINSTALL THROTTLE BODY
(See throttle body installation)
± ENGINESFI SYSTEM (2JZ±GTE)EG±317

OXYGEN SENSOR
Main Heated Oxygen Sensor
COMPONENTS FOR REMOVAL AND
INSTALLATION
OXYGEN SENSOR INSPECTION
1. WARM UP ENGINE
Allow the engine to warm up to normal operating tempera-
ture.
2. INSPECT FEEDBACK VOLTAGE
Connect the positive (+) tester probe of a voltmeter to termi-
nal VF1 of the DLC1, and negative (±) tester probe to terminal
E1. Do the test as described on the next page.
HINT: Use SST when connecting between terminals TE1 and
E1 of the DLC1.
SST 09843±18020 EG±318
± ENGINESFI SYSTEM (2JZ±GTE)

(See page EG±788)
(See page EG±788)
Warm up the oxygen sensor with the engine
at 2,500 rpm for approx. 120 seconds.
Connect terminals TE1 and E1 of the data link connector 1.
And maintain engine speed at 2,500 rpm.
Check the number of times the voltmeter needle fluctuates in 10 seconds.
Less than 8 times
Warm up the oxygen sensor with the engine at
2,500 rpm for approx. 120 seconds. And maintain
engine at 2,500 rpm.
Check the number of times the voltmeter needle
fluctuates in 10 seconds.
Less than 8 times
Disconnect terminates TE1 and E1 of the data link connector1. And maintain engine speed at 2,500 rpm.
Measure voltage between terminals VF1 (VF2) and E1.
More than 0 V
Read and record diagnostic trouble codes. (See page EG±788)
Normal code, codes Nos.
21, 25, 26 and 26Malfunction code(s)
(Except code Nos. 21, 25, 26 and 26)
Repair the relevant diagnostic trouble code.
Malfunction code(s)
(Except code Nos. 21, 25, 26)
Read and record diagnostic trouble codes. (See page EG±788)
Normal code, codes Nos. 21, 25, 26
Disconnect terminals TE1 and E1 of the data link connector 1.
And maintain engine speed at 2,500 rpm.
Measure voltage between terminals VF1 (VF2) and E1.
Repair
(Over rich)
More
than 0 V
Disconnect the PCV hose.
Measure voltage between terminals VF1 and E1.
Disconnect the ECT sensor connector, and connect resistor
with a resistance of 4 ± 8k
or send an equivalent simulation
signal.
Connect terminals TE1 and E1 of the data link connector 1.
Warm up the oxygen sensor with the engine at
2,500 rpm for approx. 120 seconds. And maintain engine
speed at 2,500 rpm.
Measure voltage between terminals VF1 and E1.
Repair (Over lean)Replace the oxygen sensor.
After replacing
the oxgen
sensor.
Replace he ECM.
± ENGINESFI SYSTEM (2JZ±GTE)EG±319

3. INSPECT HEATER RESISTANCE OF MAIN HEATED
OXYGEN SENSOR
(a) Disconnect the oxygen sensor connector.
(b) Using an ohmmeter, measure the resistance between the
terminals +B and HT.
Resistance:
At 20°C (68°F) 11±16

If the resistance is not as specified, replace the sensor.
Torque: 20 NVm (200 kgfVcm, 14 ftVlbf)
(c) Reconnect the oxygen sensor connector. EG±320
± ENGINESFI SYSTEM (2JZ±GTE)