1997 TOYOTA SUPRA lights

DI4SH-01
FI0534
Q08242
TOYOTA Hand-Held Tester
DLC3
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-147
375 Author
: Date
:
1997 SUPRA (RM502U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
When troubleshooting OBD II vehicles, the only differ-
ence from the usual troubleshooting procedure is that you
connect to the vehicle the OBD II scan tool complying with
SAE J1978 or TOYOTA hand-held tester, and read off
various data output from the vehicle's ECM.
OBD II regulations require that the vehicle's on-board
computer lights up the Malfunction Indicator Lamp (MIL)
on the instrument panel when the computer detests a
malfunction in the computer itself or in drive system com-
ponents which affect vehicle emissions. In addition to the
MIL lighting up when a malfunction is detected, the appli-
cable Diagnostic Trouble Codes (DTC) prescribed by
SAE J2012 are recorded in the ECM memory.
(See page DI-158)
If the malfunction does not reoccur in 3 trips, the MIL goes
off but the DTC remain recorded in the ECM memory.
To check the DTC, connect the OBD II scan tool or TOYO-
TA hand-held tester to Data Link Connector 3 (DLC3) on
the vehicle. The OBD II scan tool or TOYOTA hand-held
tester also enables you to erase the DTC and check
freezed frame data and various forms of engine data. (For
operating instructions, see the OBD II scan tool's instruc-
tion book.)
DTC include SAE controlled codes and Manufacturer
controlled codes.
SAE controlled codes must be set as prescribed by the
SAE, while Manufacturer controlled codes can be set
freely by the manufacturer within the prescribed limits.
(See DTC chart on page DI-158)
The diagnosis system operates in normal mode during
normal vehicle use. It also has a check mode for techni-
cians to simulate malfunction symptoms and trouble-
shoot. Most DTC use 2 trip detection logic* to prevent er-
roneous detection and ensure thorough malfunction
detection. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL to light
up for a malfunction that is only detected once or momen-
tarily. (TOYOTA hand-held tester only)
(See page DI-147)
*2 trip detection logic: When a logic malfunction is first de-
tected, the malfunction is temporarily stored in the ECM
memory. If the same malfunction is detected again during
the second drive test, this second detection causes the
MIL to light up.

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)

DI4SI-01
DI-158
- DIAGNOSTICSENGINE (2JZ-GTE)
386 Author
: Date
:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below. For details of each code, turn to the page reffered to under the ºSee pageº for the respec-
tive ºDTC No.º in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P0100
(DI-170)Mass Air Flow Circuit
MalfunctionOpen or short in mass air flow meter circuit
Mass air flow meter
ECM

P0101
(DI-174)Mass Air Flow Circuit
Range / Performance ProblemMass air flow meter
P0110
(DI-175)Intake Air Temp. Circuit
MalfunctionOpen or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM

P0115
(DI-179)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM

P0116
(DI-183)Engine Coolant Temp. Circuit
Range / Performance ProblemEngine coolant temp. sensor
Cooling system
P0120
(DI-184)Throttle / Pedal Position
Sensor / Switch ºAº Circuit
MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM

P0121
(DI-189)Throttle /Pedal Position
Sensor / Switch ºAº Circuit
Range / Peformance Problem
Throttle position sensor
P0125
(DI-190)Insufficient Coolant Temp. for
Closed Loop Fuel ControlOpen or short in heated oxygen sensor circuit
Heated oxygen sensor
P130
(DI-193)Heated Oxygen Sendor Circuit
Malfunction
(Bank 1 Sensor 1)Heated oxygen sensor
Fuel trim malfunction
P0133
(DI-196)Heated Oxygen Sensor Circuit
Slow Response
(Bank 1 Sensor 1)
Heated oxygen sensor
*: ... MIL lights up

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-159
387 Author
: Date
:
1997 SUPRA (RM502U)DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P0135
(DI-197)Heated Oxygen Sensor Heater
Circuit Malfunction
(Bank 1 Sensor 1)Open or short in heater circuit of heated oxygen sensor
Heated oxygen sensor heater
ECM

P0136
(DI-199)Heated Oxygen Sensor Circuit
Malfunction
(Bank 1 Sensor 2)
Heated oxygen sensor
P0141
(DI-197)Heated Oxygen Sensor Heater
Circuit Malfunction
(Bank 1 Sensor 2)
Same as DTC No. P0135
P0171
(DI-201)System too Lean
(Fuel Trim)
Air Intake (hose loose)
Fuel line pressure
Injector blockage
Heated oxygen sensor malfunction
Mass air flow meter
Engine coolant temp. sensor

P0172
(DI-201)System too Rich
(Fuel Trim)
Fuel line pressure
Injector blockage, leak
Heated oxygen sensor malfunction
Mass air flow meter
Engine coolant temp. sensor

P0300
(DI-204)Random / Multiple Cylinder
Misfire DetectedIgnition system
In
jector
P0301
P0302
P0303
P0304
P0305
P0306
(DI-204)Misfire Detected
- Cylinder 1
- Cylinder 2
- Cylinder 3
- Cylinder 4
- Cylinder 5
- Cylinder 6
Injector
Fuel line pressure
EGR
Compression pressure
Valve clearance not to specification
Valve timing
Mass air flow meter
Engine coolant temp. sensor

P0325
(DI-209)Knock Sensor 1 Circuit
MalfunctionOpen or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM

P0330
(DI-209)Knock Sensor 2 Circuit
MalfunctionOpen or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM

P0335
(DI-212)Crankshaft Position
Sensor ºAº Circuit
Malfunction
Open or short in crankshaft position sensor circuit for NE sig-
nal
Crankshaft position sensor for NE signal
Starter
ECM

*: ... MIL lights up

DI-160
- DIAGNOSTICSENGINE (2JZ-GTE)
388 Author
: Date
:
1997 SUPRA (RM502U)DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P0340
(DI-215)Camshaft Position Sensor
Circuit Malfunction
Open or short in camshaft position sensor circuit
Camshaft position sensor
Open or short in crankshaft position sensor circuit for NE2
signal
Crankshaft position sensor for NE2 signal
Starter
ECM

P0401
(DI-217)Exhaust Gas Recirculation Flow
Insufficient Detected
EGR valve stuck closed
Short in VSV circuit for EGR
Open in EGR gas temp. sensor circuit
EGR hose disconnected
ECM

P0402
(DI-227)Exhaust Gas Recirculation Flow
Excessive Detected
EGR valve stuck open
EGR VSV open malfunction
Open in VSV circuit for EGR
Short in EGR gas temp. sensor circuit
ECM

P0420
(DI-231)Catalyst System Efficiency
Below ThresholdThree-way catalytic converter
Open or short in heated oxygen sensor circuit
Heated oxygen sensor

P0441
(DI-234)Evaporative Emission Control
System Incorrect Purge Flow
Open or short in VSV circuit for EVAP
VSV for EVAP
ECM
Vacuum hose blocked or disconnected
Charcoal canister

P0500
(DI-238)Vehicle Speed Sensor
Malfunction
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
Combination meter
ECM

P0505
(DI-240)Idle Control System Malfunction
IAC valve is stuck or closed
Open or short in IAC valve circuit
Open or short in A/C signal circuit
Air intake (hose loose)

P0510
(DI-243)Closed Throttle Position Switch
MalfunctionOpen in closed throttle position switch circuit
Closed throttle position switch
ECM

*: ... MIL lights up

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-161
389 Author
: Date
:
1997 SUPRA (RM502U)
DTC CHART (Manufacture Controlled)
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P1100
(DI-247)Barometric Pressure Sensor Cir-
cuit MAlfunctionECM
P1200
(DI-248)Fuel Pump Relay / ECU Circuit
Malfunction
Open or short in fuel pump ECU circuit
Fuel pump ECU
ECM power source circuit
Fuel pump
ECM
-
P1300
(DI-252)Igniter Circuit
MalfunctionOpen or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM

P1335
(DI-257)Crankshaft Position Sensor
Circuit Malfunction (during
engine running)
Open or short in crankshaft position sensor circuit for NE sig-
nal
Crankshaft position sensor for NE signal
Starter
ECM
-
P1400
(DI-258)Sub Throttle Position Sensor
MalfunctionOpen or short in sub throttle position sensor circuit
Sub throttle position sensor
ECM

P1401
(DI-261)Sub Throttle Position Sensor
Range / Performance ProblemSub throttle position sensor
P1405
(DI-262)Turbo Pressure Sensor Circuit
MalfunctionOpen or short in turbo pressure sensor circuit
Turbo pressure sensor
ECM

P1406
(DI-265)Turbo Pressure Sensor Circuit
Range / Performance ProblemTurbo pressure sensor
P1511
(DI-266)Boost Pressure Low
Malfunction
Air intake (leakage or clogging)
Actuator (for waste gate valve, IACV control valve, exhaust
bypass valve and exhaust gas control valve)
Short in VSV for waste gate valve, IACV control valve, exhaust
bypass valve and exhaust gas control valve circuit
ECM

P1512
(DI-274)Boost Pressure High
Malfunction
Actuator (for waste gate valve and exhaust bypass valve)
Short in VSV for waste gate valve and exhaust bypass valve
circuit
ECM

P1520
(DI-279)Stop Light Switch Signal
MalfunctionShort in stop light switch signal circuit
Stop light switch
ECM

P1600
(DI-282)ECM BATT
MalfunctionOpen in back up power source circuit
ECM
*:
.... MIL dose not light up
 ... MIL lights up

DI-162
- DIAGNOSTICSENGINE (2JZ-GTE)
390 Author
: Date
:
1997 SUPRA (RM502U)DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P1605
(DI-284)Knock Control CPU
MalfunctionECM
P1630
(DI-285)Traction Control System
Malfunction
Open or short in ETC+ or ETC- circuit
Open or short in EFI+ or EFI- circuit
Throttle control ECU
ECM
-
P1652
(DI-287)IACV Control CIrcuit
MalfunctionOpen or short in VSV circuit for IACV
VSV for IACV
ECM

P1658
(DI-291)Waste Gate Valve Control CIrcuit
MalfunctionOpen or short in VSV circuit for waste gate valve
VSV for waste gate valve
ECM

P1661
(DI-294)Exhaust Gate Valve Control CIr-
cuit MalfunctionOpen or short in VSV circuit for exhaust gate control valve
VSV for exhaust gate control valve
ECM

P1662
(DI-297)Exhaust Bypass Valve Control
CIrcuit MalfunctionOpen or short in VSV circuit for exhaust bypass valve
VSV for exhaust bypass valve
ECM

P1780
(DI-300)Park / Neutral Position Switch
MalfunctionShort in park / neutral position switch circuit
Park / neutral position switch
ECM

*:
.... MIL dose not light up
 ... MIL lights up

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-201
429 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0171 System too Lean (Fuel Trim)
DTC P0172 System too Rich (Fuel Trim)
CIRCUIT DESCRIPTION
ºFuel trimº refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short-term fuel trim and long-term fuel trim.
ºShort-term fuel trimº is the short-term fuel compensation used to maintain the air-fuel ratio at its ideal
theoretical value. The signal from the heated oxygen sensor indicates whether the air-fuel ratio is RICH or
LEAN compared to the ideal theoretical value, triggering a reduction in fuel volume if the air-fuel ratio is rich,
and an increase in fuel volume if it is lean.
ºLong-term fuel trimº is overall fuel compensation carried out long-term to compensate for continual devi-
ation of the short-term fuel trim from the central value due to individual engine differences, wear over time
and changes in the usage environment.
If both the short-term fuel trim and long-term fuel trim are LEAN or RICH beyond a certain value, it is de-
tected as a malfunction and the MIL lights up.
DTC No.DTC Detecting ConditionTrouble Area
P0171
When the air fuel ratio feedback is stable after engine warning
up, the fuel trim is considerably in error on the RICH side
(2 trip detection logic)

Air intake (hose loose)

Fuel line pressure

Injector blockage

Heated oxygen sensor malfunction

Mass air flow meter

Engine coolant temp. sensor
P0172
When the air fuel ratio feedback is stable after engine warning
up, the fuel trim is considerably in error on the LEAN side
(2 trip detection logic)

Fuel line pressure

Injector blockage, leak

Heated oxygen sensor malfunction

Mass air flow meter

Engine coolant temp. sensor
HINT:

When DTC P0171 is recorded, the actual air-fuel ratio is on the LEAN side. When DTC P0172 is re-
corded, the actual air-fuel ratio is on the RICH side.

If the vehicle runs out of fuel, the air-fuel ratio is LEAN and DTC P0171 is recorded. The MIL then
comes on.

If the total of the short-term fuel trim value and long-term fuel trim value is within ± 35 %, the system
is functioning normally.
INSPECTION PROCEDURE
1 Check air induction system (See page SF-1).
NG Repair or replace.
OK
DI4SY-01