1997 TOYOTA SUPRA engine

N09214
DLC3 DI-148
- DIAGNOSTICSENGINE (2JZ-GTE)
376 Author
: Date
:
1997 SUPRA (RM502U)
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).
Freeze frame data:
Freeze frame data records the engine condition when a
misfire (DTC P0300 - P0306) or fuel trim malfunction
(DTC P0171, P0172), or other malfunction (first malfunc-
tion only), is detected.
Because freeze frame data records the engine conditions
(fuel system, calculator load, engine coolant tempera-
ture, fuel trim, engine speed, vehicle speed, etc.) when
the malfunction is detected, when troubleshooting it is
useful for determining whether the vehicle was running or
stopped, the engine warmed up or not, the air-fuel ratio
lean or rich, etc. at the time of the malfunction.
Priorities for Troubleshooting:
If troubleshooting priorities for multiple DTC are given in
the applicable diagnostic chart, these should be followed.
If no instructions are given troubleshoot DTC according
to the following priorities.
(1) DTC other than fuel trim malfunction (DTC P0171,
P0172), EGR (DTC P0401, P0402), and misfire
(DTC P0300 - 0306).
(2) Fuel trim malfunction (DTC P0171, P0172) and
EGR (DTC P0401, P0402).
(3) Misfire (DTC P0300 - P0306).
(b) Check the DLC3.
The vehicle's ECM uses V.P.W. (Variable Pulse Width) for
communication to comply with SAE J1850. The terminal
arrangement of DLC3 complies with SAE J1962 and
matches the V.P.W. format.
Terminal No.Connection / Voltage or ResistanceCondition
2Bus  Line / Pulse generationDuring transmission
4Chassis Ground / e Body Ground 1 W or lessAlways
5Signal Ground / e Body Ground 1 W or lessAlways
16Battery Positive / e Body Ground 9 - 14 VAlways
HINT:
If your display shows ºUNABLE TO CONNECT TO VEHICLEº
when you have connected the cable of the OBD II scan tool or
TOYOTA hand-held tester to DLC3, turned the ignition switch
ON and operated the scan tool, there is a problem on the ve-
hicle side or tool side.

If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

FI6914
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-149
377 Author
: Date
:
1997 SUPRA (RM502U)
2. INSPECT DIAGNOSIS (Normal mode)
(a) Check the MIL.
(1) The MIL comes on when the ignition switch is turned
ON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page BE-2).
(2) When the engine is started, the MIL should go off.
If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
(TOYOTA hand-held tester only): When the diagnosis sys-
tem is switched from normal mode to check mode, it erases
all DTC and freezed frame data recorded in normal mode.
So before switching modes, always check the DTC and
freezed frame data, and note them down.
(1) Prepare the OBD II scan tool (complying with SAE
J1978) or TOYOTA hand-held tester.
(2) Connect the OBD II scan tool or TOYOTA hand-
held tester to DLC3 at the lower left of the instru-
ment panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand-held tester switch ON.
(4) Use the OBD II scan tool or TOYOTA hand-held
tester to check the DTC and freezed frame data,
note them down. (For operating instructions, see
the OBD II scan tool's instruction book.)
(5) See page DI-158 to confirm the details of the DTC.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand-held tester) to check the DTC, use
normal mode. For codes on the DTC chart subject to º2 trip
detection logicº, turn the ignition switch OFF after the
symptom is simulated the first time. Then repeat the simu-
lation process again. When the problem has been simu-
lated twice, the MIL lights up and the DTC are recorded in
the ECM.
3. INSPECT DIAGNOSIS (Check Mode)

FI3605
Flashing
ON
OFF
0.13 Seconds DI-150
- DIAGNOSTICSENGINE (2JZ-GTE)
378 Author
: Date
:
1997 SUPRA (RM502U)
TOYOTA hand-held tester only:
Compared to the normal mode, the check mode has an in-
creased sensitivity to detect malfunctions.
Furthermore, the same diagnostic items which are detected in
the normal mode can also be detected in the check mode.
(a) Check the DTC.
(1) Initial conditions.

Battery positive voltage 11 V or more.

Throttle valve fully closed.

Transmission in park or neutral position.

Air conditioning switched OFF.
(2) Turn ignition switch OFF.
(3) Prepare the TOYOTA hand-held tester.
(4) Connect the TOYOTA hand-held tester to DLC3 at
the lower left of the instrument panel.
(5) Turn the ignition switch ON and switch the TOYOTA
hand-held tester ON.
(6) Switch the TOYOTA hand-held tester normal mode
to check mode. (Check that the MIL flashes.)
(7) Start the engine. (The MIL goes out after the engine
start.)
(8) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTC, etc.
(9) After simulating the malfunction conditions, use the
TOYOTA hand-held tester diagnosis selector to
check the DTC and freezed frame data, etc.
HINT:
Take care not to turn the ignition switch OFF. Turning the ignition
switch OFF switches the diagnosis system from check mode to
normal mode, so all DTC, etc. are erased.
(10) After checking the DTC, inspect the applicable cir-
cuit.
(b) Clear the DTC.
The following actions will erase the DTC and freezed frame
data.
(1) Operating the OBD II scan tool (complying with SAE
J1978) or TOYOTA hand-held tester to erase the
codes. (See the OBD II scan tool's instruction book
for operating instructions.)
(2) Disconnecting the battery terminals or EFI fuse.
NOTICE:
If the TOYOTA hand-held tester switches the ECM from
normal mode to check mode or vice-versa, or if the ignition
switch is turned from ON to ACC or OFF during check
mode, the DTC and freezed frame data will be erased.

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-151
379 Author
: Date
:
1997 SUPRA (RM502U)
4. FAIL-SAFE CHART
If any of the following codes is recorded, the ECM enters fail-safe mode.
DTC No.Fail-Safe OperationFail-safe Deactivation Conditions
P0100Fuel cutReturned to normal condition
P0110Intake air temp. is fixed at 20°C (68°F)Returned to normal condition
P0115Engine coolant temp. is fixed at 80°C (176°F)Returned to normal condition
P0120VTA is fixed at 0°
The following condition must be repeated at least 2 times
consecutively
When closed throttle position switch is ON:
0.25 V  VTA1 0.95 V
P0135
P0141The heater circuit in which an abnormality is detected is
turned offIgnition switch OFF
P0325
P0330Max. timing retardationIgnition switch OFF
P0500High RPM fuel cut is prohibited
IAC control prohibitedReturned to normal condition
P1100HAC is fixed at 760 mm HgReturned to normal condition
P1300Fuel cutReturned to normal condition
P1400Sub throttle valve is fixed at almost fully-open position
The following condition must be repeated at least 2 times
consecutively.
When closed subthrottle position switch is ON:
0.25 V  VTA2 0.95 V
P1405Waste gate valve is fixed at open positionReturned to normal condition
P1512Fuel cutPressure intake manifold  1400 mm Hg´abs
P1605Max. timing retardationReturned to normal condition
P1630Does not into the manual patternReturned to normal condition
5. CHECK FOR INTERMITTENT PROBLEMS
TOYOTA hand-held tester only:
By putting the vehicle's ECM in check mode, 1 trip detection logic is possible instead of 2 trip detection logic
and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
(1) Clear DTC (See page DI-147)
(2) Set check mode (See page DI-147)
(3) Perform a simulation test (See page IN-18)
(4) Connector connection and terminal inspection (See page IN-28)
(5) Visual check and contact pressure check (See page IN-28)
(6) Connector handling (See page IN-28)

DI-152
- DIAGNOSTICSENGINE (2JZ-GTE)
380 Author
: Date
:
1997 SUPRA (RM502U)
6. BASIC INSPECTION
When the malfunction code is not confirmed in the DTC check, troubleshooting should be performed in the
order for all possible circuits to be considered as the causes of the problems.
In many causes, by carrying out the basic engine check shown in the following flow chart, the location caus-
ing the problem can be found quickly and efficiently. Therefore, use of this check is essential in engine trou-
bleshooting.
1 Is battery positive voltage 11 V or more when engine is stopped?
NO Charge or replace battery.
YES
2 Is engine cranked?
NO Proceed to page ST-14, ST-16 and continue to
troubleshoot.
YES
3 Does engine start?
NO Go to step 7.
YES

MA0688
Outside
Inside
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-153
381 Author
: Date
:
1997 SUPRA (RM502U)
4 Check are filter.
PREPARATION:
Remove air filter.
CHECK:
Visually check that the air cleaner element is not dirty or exces-
sively oily.
HINT:
If necessary, clean element with compressed air. First blow from
inside throughly, then blow from outside of element.
NG Repair or replace.
OK
5 Check idle speed.
PREPARATION:
(a) Warm up engine to normal operating temperature.
(b) Switch off all accessories.
(c) Switch off air conditioning.
(d) Shift transmission into ºNº position.
(e) Connect the OBD II scan tool or TOYOTA hand-held tester to DLC3 on the vehicle.
CHECK:
Use CURRENT DATA to check the engine idle speed.
OK:
Idle speed: 650 ± 50 rpm
NG Proceed to matrix chart of problem symptoms
on page DI-169.
OK

P11288P11833A03032
TE1
E1
SST
DLC1
DI-154
- DIAGNOSTICSENGINE (2JZ-GTE)
382 Author
: Date
:
1997 SUPRA (RM502U)
6 Check ignition timing.
PREPARATION:
(a) Warm up engine to normal operating temperature.
(b) Shift transmission into ºNº position.
(c) Keep the engine speed at idle.
(d) Using SST, connect terminals TE1 and E1 of DLC 1.
SST 09843-18020
(e) Using a timing light, connect the tester to check wire
(See page EM-1 1).
CHECK:
Check ignition timing.
OK:
Ignition timing: 10 ± 2° BTDC at idle
NG Proceed to IG-1 and continue to
troubleshoot.
OK
Proceed to matrix chart of problem symp-
toms on page DI-169.

P11446Fuel Inlet Hose
P11799
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-155
383 Author
: Date
:
1997 SUPRA (RM502U)
7 Check fuel pressure.
PREPARATION:
(a) Be sure that enough fuel is in the tank.
(b) Turn ignition switch ON.
(c) Connect the TOYOTA hand-held tester to DLC3 on the
vehicle.
(d) Use ACTIVE TEST mode to operate the fuel pump.
(e) If you have no TOYOTA hand-held tester, connect the
positive (+) and negative (-) leads from the battery to the
fuel pump connector (See page SF-5).
CHECK:
Check for fuel pressure in the fuel inlet hose when it is pinched
off.
HINT:
At this time, you will hear the sound of flowing.
NG Proceed to page SF-5 and continue
totroubleshoot.
OK
8 Check for spark.
PREPARATION:
(a) Remove ignition coil (See page IG-6).
(b) Remove spark plug.
(c) Install the spark plug to the ignition coil, and connect the
ignition coil connector.
(d) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:
To prevent excess fuel being injected from the injectors
during this test, don't crank the engine for more than 5 ~ 10
sec. at a time.
NG Proceed to page IG-1 and continue to
troubleshoot.
OK
Proceed to matrix chart of problem systems
on page DI-169.