TOYOTA SUPRA 1995 Service Repair Manual

VSV INSPECTION
1. REMOVE VSV
2. INSPECT VSV
A. Inspect VSV for open circuit
Using an ohmmeter, check that there is continuity between
the terminals.
Resistance:
At 20°C (68°F) 38.5±44.5

If there is no continuity, replace the VSV.
B. Inspect VSV for ground
Using an ohmmeter, check that there is no continuity be-
tween each terminal and the body.
If there is continuity, replace the VSV.
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
± ENGINESFI SYSTEM (2JZ±GE)EG±241

ENGINE COOLANT TEMPERATURE
(ECT) SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
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 EG±242
± ENGINESFI SYSTEM (2JZ±GE)

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
± ENGINESFI SYSTEM (2JZ±GE)EG±243

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 EG±244
± ENGINESFI SYSTEM (2JZ±GE)

KNOCK SENSOR
COMPONENTS FOR REMOVAL AND
INSTALLATION
KNOCK SENSORS INSPECTION
1. REMOVE STARTER
(See starter removal in Starting System)
2. REMOVE KNOCK SENSORS
(a) Disconnect the knock sensor connector.
(b) Using SST, remove the knock sensor.
SST 09816±30010
3. 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.
± ENGINESFI SYSTEM (2JZ±GE)EG±245

4. 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.
5. REINSTALL STARTER
(See starter installation in Starting System)
OXYGEN SENSOR
Main Heated Oxygen Sensors
(California) or Oxygen Sensors (Except
California)
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±246± ENGINESFI SYSTEM (2JZ±GE)

OXYGEN SENSORS 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 (for No.1) or VF2 (for No.2) of the DLC 1, and nega-
tive (±) 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
± ENGINESFI SYSTEM (2JZ±GE)EG±247

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±634)
Normal code, codes Nos.
21, 25, 26 and 28Malfunction code(s)
(Except code Nos. 21, 25, 26 and 28)
Repair the relevant diagnostic trouble code.
Malfunction code(s)
(Except code Nos. 21, 25, 26 and 28)
Read and record diagnostic trouble codes. (See page EG±634)
Normal code, codes Nos. 21, 25, 26 and 28
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 (VF2) 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 (VF2) and E1.
Repair (Over lean)Replace the oxygen sensor.
Replce the ECM.
After replacing
the oxygen
sensor.
EG±248± ENGINESFI SYSTEM (2JZ±GE)

3. California only:
INSPECT HEATER RESISTANCE OF MAIN HEATED OXY-
GEN SENSORS
(a) Disconnect the oxygen sensor connectors.
(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: 44 NVm (450 kgfVcm, 33 ftVlbf)
(c) Reconnect the oxygen sensor connectors.
± ENGINESFI SYSTEM (2JZ±GE)EG±249

Sub Heated Oxygen Sensor
(California only)
COMPONENTS FOR REMOVAL AND
INSTALLATION
EG±250± ENGINESFI SYSTEM (2JZ±GE)