1997 TOYOTA SUPRA check engine

A00702
KNK Signal Waveform
0.5 V/
Division
0 V
5 m sec./Division
0.5 V/
Division
0 V
100
sec./Division
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-21 1
439 Author
: Date
:
1997 SUPRA (RM502U)
4 Does malfunction disappear when a good knock senor is installed?
YES Replace knock sensor.
NO
Check and replace ECM (See page IN-28).
Reference INSPECTION USING OSCILLOSCOPE

With the engine racing (4,000 rpm) measure waveform
between terminals KNK1, KNK2 of ECM and body
ground.
HINT:
The correct waveform is as shown.

Spread the time on the horizontal axis, and confirm that
period of the wave is 123
sec. (Normal, mode vibration
frequency of knock sensor: 8.1 KHz).
HINT:
If normal mode vibration frequency is not 8.1 KHz, the sensor
is malfunctioning.

P23868A07740A06718
FI6519A03396
G. NE Signal Waveforms
5 V/Division
20 m sec./Division (Idling) G1
G2
NE
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-213
441 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check resistance of crankshaft position sensor for NE signal.
PREPARATION:
Disconnect crankshaft position sensor connector.
CHECK:
Measure resistance of crankshaft position sensor.
OK:
Resistance
Cold835 ~ 1,400 W
Hot1,060 ~ 1,645 W
ºColdº is from -10°C (14°F) to 50°C (122°F) and ºHotº is from
50°C (122°F) to 100°C (212°F).
Reference INSPECTION USING OSCILLOSCOPE

During cranking or idling, check between ECM terminals
G1, G2 and G1
, NE and NE
of engine control module.
HINT:
The correct waveforms are as shown.
NG Replace distributor.
OK
2 Check for open and short in harness and connector between ECM and crank-
shaft position sensor for NE signal (See page IN-28).
NG Repair or replace harness or connector.
OK

DI-214
- DIAGNOSTICSENGINE (2JZ-GTE)
442 Author
: Date
:
1997 SUPRA (RM502U)
3 Inspect sensor installation and teeth of signal plate.
NG Tighten the sensor.
Replace signal plate.
OK
Check and replace ECM (See page IN-28).

P20769
70 - 90 km/h
(43 - 56 mph)
Idling
IG SW OFF
Warm up
3 - 5 min.
2 min.3 - 5 min.
2 min.Time
(7) (6)
(5) (7) (3)
(2) (1) DI-218
- DIAGNOSTICSENGINE (2JZ-GTE)
446 Author
: Date
:
1997 SUPRA (RM502U)
SYSTEM CHECK DRIVING PATTERN
(1) Connect the OBDII scan tool or TOYOTA hand-held tester to the DLC3.
(2) Start the engine and warm it up with all accessories switched OFF.
(3) Run the vehicle at 70 - 90 km/h (43 - 56 mph) for 3 min. or more.
(4) Idle the engine for about 2 min.
(5) Stop at safe place and turn the ignition switch OFF.
(6) Start the engine and do steps (3) and (4) again.
(7) Check the ºREADINESS TESTSº mode on the OBDII scan tool or TOYOTA hand-held tester. If ºCOMPLº
is displayed and the MIL does not light up, the system is normal. If ºINCMPLº is displayed and the MIL does
not light up, run the vehicle again and check it.
HINT:
ºINCMPLº is displayed when either condition (a) or (b) exists.

The system check is incomplete.

There is a malfunction in the system.
If there is a malfunction in the system, the MIL will light up after steps (2) to (6) above are done.

A00168
ON
EGR Gas Temp.
Sensor
2
146
65
B
BTHG
ECM
5V
E2
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-219
447 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and read value of EGR gas temperature.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and TOYOTA hand-held tester main switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 10°C (50°F) or more
HINT:
If there is an open circuit, the TOYOTA hand-held tester indicates 3.1°C (37.6°F).
OK Go to step 4.
NG
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the EGR gas temp. sensor connector.
(b) Connect sensor wire harness terminals together.
(c) Turn ignition switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 159.3°C (318.7°F)
OK Confirm good connection at sensor.
If OK, replace EGR gas temp. sensor.
NG

A00706
ON
EGR Gas
Temp. Sensor
2
1ECM
46
65
B
BTHG
5V
E2
Check Harness A
ECM
B46, 65
E2
(-) THG
(+)
DI-220
- DIAGNOSTICSENGINE (2JZ-GTE)
448 Author
: Date
:
1997 SUPRA (RM502U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Connect between terminals THG and E2 of ECM.
HINT:
EGR gas temp. sensor connector is disconnected. Before
checking, do a visual check and connect pressure check for the
ECM connector (See page IN-28).
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 159.3°C (318.7°F)
OK Open in harness between terminals E2 or THG.
Repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.
4 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK
5 Check EGR system (See page EC-7).
OK Check and replace ECM (See page IN-28).
NG

A00595
ON
Air
Air
E
F
E
F
System: ON
System: OFF
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-221
449 Author
: Date
:
1997 SUPRA (RM502U)
6 Check the VSV for EGR.
PREPARATION:
Select the ACTIVE TEST mode on the TOYOTA hand-held tes-
ter.
CHECK:
Check operation of VSV when it is operated by the TOYOTA
hand-held tester.
OK:
EGR system is ON:
Air from pipe E flows out through pipe F.
EGR system is OFF:
Air does not flow from pipe E to pipe F.
OK Go to step 8.
NG
7 Check operation of the VSV for EGR (See page SF-69).
NG Replace VSV for EGR.
OK
Check for open in harness and connector be-
tween VSV and ECM (See page IN-28).
8 Check EGR vacuum modulator (See page EC-7).
NG Repair or replace.
OK

DI-222
- DIAGNOSTICSENGINE (2JZ-GTE)
450 Author
: Date
:
1997 SUPRA (RM502U)
9 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
10 Check value of EGR gas temp. sensor.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester. (EGR system ON)
(d) Race the engine at 4,000 rpm for 3 min.
CHECK:
Measure the EGR gas temp. while racing engine at 4,000 rpm.
OK:
EGR gas temp. after 3 min.: 120°C (248°F) or more
NG Replace EGR gas temp. sensor.
OK
Check and replace ECM (See page IN-28).