TOYOTA SUPRA 1997 Service Repair Manual

FI6519A03396
G. NE Signal Waveforms
5 V/Division
20 m sec./Division (Idling) G1
G2
NE
DI-216
- DIAGNOSTICSENGINE (2JZ-GTE)
444 Author
: Date
:
1997 SUPRA (RM502U)
Reference INSPECTION USING OSCILLOSCOPE

During cranking or idling, check between ECM terminals
G1, G2 and G1
, NE and NE
of ECM.
HINT:
The correct waveforms are as shown.
NG Replace distributor.
OK
2 Check for open and short in harness and connector between ECM and camshaft
position sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Inspection sensor installation.
NG Tighten the sensor.
OK
Check and replace ECM (See page IN-28).

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-247
475 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1100 Barometric Pressure Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The BARO sensor is built into the ECM. This is a semiconductor pressure sensor with properties which cause
its electrical resistance to change when stress is applied to the sensor's crystal (silicon) (piezoelectric effect).
This sensor is used to detect the atmospheric (absolute) pressure and outputs corresponding electrical sig-
nals. Fluctuations in the air pressure cause changes in the intake air density, which can cause deviations
in the air-fuel ratio. The signals from BARO sensor are used to make corrections for these fluctuations. If
the ECM detects DTC P1100, the fail safe function operates and the atmospheric pressure is set at a
constant 760 mmHg.
DTC No.DTC Detecting ConditionTrouble Area
P1100Open or short detected in barometric pressure sensor circuit
(2 trip detection logic)
ECM
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P1100) being output?
YES Go to relevant DTC chart.
NO
Replace ECM.
DI4TA-01

S05428
Battery
B
W-B
EFI No.1
EB
R/B
No.2
2A12
B-D
R/B
No.2
2
2 2 2
51
32
EFI No.2 Relay
B-R L-O
E1 L-O
B-R
B-R 5EA2
BP1
BI
2
W-B
W-B
Fuel
Pump
5 4
L
6BP1
5L-R
FP4 Fuel Pump ECU
B+
B+
E
1DI FPCVSV for
Fuel Pressure
12
W-L
IB1IC2
73
22
21
B
A
A
V-WV-W
V-W
GG
G 1211
124IC2IJ1
IJ1
IC2
DI FPC5VEO1 FPUECM
5
10 DI-248
- DIAGNOSTICSENGINE (2JZ-GTE)
476 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1200 Fuel Pump Relay/ECU Circuit Malfunction
CIRCUIT DESCRIPTION
The fuel pump speed is controlled at 2 steps (high speed, low speed) by the condition of the engine (starting,
light load, heavy load), when the engine starts (STA ON), the ECM sends a Hi signal (about 5 V) to the fuel
pump ECU (FPC terminal).
The fuel pump ECU then outputs Hi voltage (battery positive voltage) to the fuel pump so that the fuel pump
operates at high speed.
After the engine starts, during idling or light loads, the ECM outputs a Low signal (about 2.5 V) to the fuel
pump ECU, the fuel pump ECU outputs Low voltage (about 9 V) to the fuel pump and causes the fuel pump
to operate at low speed.
If the intake air volume increases (high engine load), the ECM sends a Hi signal to the fuel pump ECU and
causes the fuel pump to operate at high speed.
DTC No.DTC Detecting ConditionTrouble Area
Open or short in fuel pump circuit for 1 sec. or more with en-
gine speed 1,000 rpm or less
(2 trip detection logic)

Open or short in fuelpumpECU circuit
P1200
Open in input circuit of fuel pump ECU (FPC) with engine
speed 1,000 rpm or less
(2 trip detection logic)

Open or short in fuel pump ECU circuit

Fuel pump ECU

ECM power source circuit

Fuel pump
Open or short in diagnostic signal line (DI) of fuel pump ECU
with engine speed 1,000 rpm or less
(2 trip detection logic)
Fuel um

ECM
WIRING DIAGRAM
DI4TB-01

BE6653S03247S03248
A03137
ON
1(+)
BE6653S03247S03249
A03138
START
5 (+)
8 (-)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-249
477 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Connect the TOYOTA hand-held tester and check operation of fuel pump
(See page SF-5).
OK Go to step 7.
NG
2 Check voltage of fuel pump ECU power source.
PREPARATION:
(a) Remove LH quarter trim panel (See page SF-83).
(b) Disconnect fuel pump ECU connector.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal 1 of fuel pump ECU connec-
tor and body ground.
OK:
Voltage: 9 - 14 V
NG Check for open and short in harness and con-
nector between EFI main relay (Marking: EFI
MAIN) and fuel pump ECU (See page IN-28).
OK
3 Check voltage between terminals 5 and 8 of fuel pump ECU connector.
PREPARATION:
(a) Remove LH quarter trim panel (See page SF-83).
(b) Disconnect fuel pump ECU connector.
CHECK:
Measure voltage between terminals 5 and 8 of fuel pump ECU
connector when ignition switch is turned to start.
OK:
Voltage: 4.5 - 5.5 V
OK Go to step 5.
NG

DI-250
- DIAGNOSTICSENGINE (2JZ-GTE)
478 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for open and short in harness and connector between terminals FPC of
ECM and 5 of fuel pump ECU, terminal 8 of fuel pump ECU and body ground
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
5 Check fuel pump (See page SF-5).
NG Repair or replace fuel pump.
OK
6 Check for open and short in harness and connector between terminal 2 and fuel
pump and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Replace fuel pump ECU.

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-251
479 Author
: Date
:
1997 SUPRA (RM502U)
7 Check for open and short in harness and connector between terminals DI of
ECM and 6 of fuel pump ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

S03235
Battery
B
R/B
No.22
2A
AM2
W-R W-R
IB147 6
Igniter
Switch
B-O
IJ11B-OB-OB-O B-O B-O
B-O
B-O
B-O
B-O
B-O
B-O
Spark Plug
Ignition Coil No.1
L-YG
Y
Y-B
Y-G
Y-R No.2
No.3
No.4
No.5
No.6 112
1
1
1
1
12
2
2
2
2
2
1
Noise Filter
BRECM
BR
EC
I24Igniter Tr
2
I22
6
5
4
10
11
12
I3 B
B
B
B
B
B
B
1
2
3
9
8
7
357
56
55
54
53
52
58
IGF5V IGT6 IGT5 IGT4IGT3 IGT2 IGT1
Tr1
5V
I3
I3
I3
I3
I3
I2 I3I3 I3 I3 I3I3
R-W
W-R
LG
B-R
L
R
R-Y DI-252
- DIAGNOSTICSENGINE (2JZ-GTE)
480 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs an ignition signal (IGT) º1º to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal º0º.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM.
The ECM stops fuel injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 6 consecutive IGT signals during
engine running
Open or short in IGF or IGT circuit from igniter to ECM

Igniter

ECM
WIRING DIAGRAM
DI4TC-01

A00720
ONCheck Harness A
ECM
B58
IGF(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-253
481 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check spark plug and spark of misfiring cylinder (See page DI-204).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5 - 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN-28).

BE6653S02439A03139
START
Check Harness A
ECM
57, 56, 55, 54
53, 52 IGT3
(+)
IGT2
(+)
IGT1
(+)
IGT4
(+)IGT5
(+)IGT6
(+)
FI6952
IGT 1 - 6, IGF signal waveform
2 V/
Division
IGT 1 - 6
0
IGF
0
20 msec./Division (Idling)
DI-254
- DIAGNOSTICSENGINE (2JZ-GTE)
482 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for open and short in harness and connector in IGT 1 ~ 6 signal circuit
between ECM and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminal IGT 1 - 6 of ECM connector and body ground.
PREPARATION:
Connect Check Harness A (See page DI-164).
CHECK:
Measure voltage between terminal IGT 1 ~ 6 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference INSPECTION USING OSCILLOSCOPE
During cranking or idling, check waveforms between terminal
IGT 1 - 6, IGF and E1 of ECM.
HINT:
The correct rectangular waveforms are as shown.
NG Check and replace ECM (See page IN-28).
OK

BE6653S02439A03139
START
Check Harness A
ECM
57, 56, 55, 54
53, 52 IGT3
(+)
IGT2
(+)
IGT1
(+)
IGT4
(+)IGT5
(+)IGT6
(+)
BE6653S02440A06728
ON " START
2(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-255
483 Author
: Date
:
1997 SUPRA (RM502U)
6 Disconnect igniter connector and check voltage between terminal IGT 1 ~ 6 of
ECM connector and body ground.
PREPARATION:
(a) Disconnect igniter connector.
(b) Connect Check Harness A (See page DI-164).
CHECK:
Measure voltage between terminal IGT 1 - 6 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN-28).
OK
7 Check voltage between terminal 2 of igniter connector and body ground.
PREPARATION:
Disconnect igniter connector.
CHECK:
Measure voltage between terminal 2 of igniter connector and
body ground, when ignition switch is turned to ºONº and
ºSTARTº position.
OK:
Voltage: 9 - 14 V
NG Check and repair igniter power source circuit.
OK