1997 TOYOTA SUPRA engine
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DI4SK-01
S00576
P11278
ECM
FI6451
CHECK HARNESS A
ECU
FI6522
Before Connection
After Connection
Female
Connector Bolt
Collar
Stopper
Nut
Connector
Male
FI6523
Less Than 1 mm (0.04 in.) DI-164
- DIAGNOSTICSENGINE (2JZ-GTE)
392 Author: Date:
1997 SUPRA (RM502U)
TERMINALS OF ECM
Connectors of the ECM are water-proof and are the bolt type.
For water proof type connectors, in order to measure the volt-
age of ECM terminals and the resistance of connected parts,
connect the inspection check harness between the ECM and
vehicle wire harness, then perform the inspection.
The inspection method of inserting a tester probe from the other
side of connector noticeably reduces the water-proof ability.
Disconnect the connector by fully loosening the bolt.
PREPARATION
(a) Turn the ignition switch to LOCK position.
(b) Turn up the passenger side floor mat.
(c) Remove the ECM protector.
(d) Disconnect the connectors from the ECM.
After completely loosening the bolt, the 2 parts of connec-
tor can be separated.
NOTICE:
Do not pully the wire harness when disconnecting the
connector.
When disconnecting the connector, the ECM's back-
up power source is cut off, so the DTC, etc. recorded
in the ECM memory are cancelled.
Never insert a tester probe or male terminal used for
inspection purposes into the female terminal of the
vehicle wire harness. Otherwise, the female terminal
may be widened, which can result in faulty connec-
tion.
(e) Connect the Check Harness A between ECM and con-
nector of vehicle wire harness.
SST 09990-01000
HINT:
The arrangement of the DLC1 terminals are the same as those
of the ECM (See page DI-164).
(f) Disconnect the Check Harness A.
(g) Reconnect the connectors to the ECM.
(1) Match the male connector correctly with female
connector, then press them together.
(2) Tighten the bolt.
Make sure the connector is completely connected,
by tightening the bolt until there is a clearance of
less than 1 mm (0.04 in.) between bottom of the
male connector and end of the female connector.
(h) Install the ECM protector and floor mat.
Page 580 of 1807
FI6460
ECM Terminals
B(E9)A(E10)
1
2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
30 29 28 27 26 25 24 23 22 21
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 211 2
3 4 5 6 7 8 9 10 19 18 17 16 15 14 13 12 11
20
40 39 38 37 36 35 34 33 32 31
50 49 48 47 46 45 44 43 42 41
70 69 68 67 66 65 64 63 62 61 60
59 58 57 56 55 54 53 52 51
8079 78 77 76 75 74 73 72 71
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-165
393 Author: Date:
1997 SUPRA (RM502U)Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
BATT (A33) - E1 (B69)B-W e BRAlways9 - 14
IGSW (A1) - E1 (B69)B-W e BRIG switch ON9 - 14
+B (A31) - E1 (B69)B-R e BRIG switch ON9 - -14
VCC (B41) - E2 (B65)L-Re W-BIG switch ON4.5 - 5.5
IDL1 (B64) E2 (B65)RWB
IG switch ON and apply vacuum to the throttle opener
Main throttle valve fully closed-0.1 - 3.0
IDL1 (B64) - E2 (B65)R e W-BIG switch ON
Main throttle valve fully opened9 - 14
IDL2 (B63) E2 (B65)GR RWB
IG switch ON
Sub-throttle valve fully closed-0.1 - 3.0
IDL2 (B63) - E2 (B65)GR-R e W-BIG switch ON
Sub-throttle valve fully open9 - 14
VTA1 (B43) E2 (B65)YWB
IG switch ON
Main or sub-throttle valve fully closed0.3 - 0.8
VTA1 (B43) - E2 (B65)Y e W-BIG switch ON
Main or sub-throttle valve fully open3.2 - 4.9
VTA2 (B42) E2 (B65)YLWB
IG switch ON
Main or sub-throttle valve fully closed0.3 - 0.8
VTA2 (B42) - E2 (B65)Y-L e W-BIG switch ON
Main or sub-throttle valve fully open3.2 - 4.9
VG (B66) - E2G (B28)Y-R e BRIdling0.7 - 1.7
THA (B45) - E2 (B65)P-L e W-BIdling, Intake air temp. 0°C (32°F) to 80°C (176°F)0.5 - 3.4
THW (B44) - E2 (B65)L-Y e W-BIdling, Engine Coolant temp. 60°C (140°F) to 120°C (248°F)0.2 - 1.0
THG (B46) - E2 (B65)BR-Y e W-BIdling after warning up1 - 4
STA (B77) - E1 (B69)B e BRCranking6.0 or more
IG switch ON9 - 14
#10 (B20) - E01 (B80)R-L e BRIdlingPulse generation
(See page DI-204)
IG switch ON9 - 14
#20 (B19) - E01 (B80)R-Y e BRIdlingPulse generation
(See page DI-204)
IG switch ON9 - 14
#30 (B18) - E01 (B80)R-G e BRIdlingPulse generation
(See page DI-204)
IG switch ON9 - 14
#40 (B17) - E01 (B80)R-W e BRIdlingPulse generation
(See page DI-204)
Page 581 of 1807
DI-166
- DIAGNOSTICSENGINE (2JZ-GTE)
394 Author: Date:
1997 SUPRA (RM502U)
IG switch ON9 - 14
#50 (B16) - E01 (B80)R e BRIdlingPulse generation
(See page DI-204)
IG switch ON9 - 14
#60 (B15) - E01 (B80)R-B e BRIdlingPulse generation
(See page DI-204)
IG switch ON- 0.1 - 0.5
IGT1 (B57) - E1 (B69)R-W e BRIdlingPulse generation
(See page DI-252)
IG switch ON- 0.1 - 0.5
IGT2 (B56) - E1 (B69)W-R e BRIdlingPulse generation
(See page DI-252)
IG switch ON- 0.1 - 0.5
IGT3 (B55) - E1 (B69)LG e BRIdlingPulse generation
(See page DI-252)
IG switch ON- 0.1 - 0.5
IGT4 (B54) - E1 (B69)B-R e BRIdlingPulse generation
(See page DI-252)
IG switch ON- 0.1 - 0.5
IGT5 (B53) - E1 (B69)L e BRIdlingPulse generation
(See page DI-252)
IG switch ON- 0.1 - 0.5
IGT6 (B52) - E1 (B69)R e BRIdlingPulse generation
(See page DI-252)
IG switch ON4.5 - 5.5
IGF (B58) - E1 (B69)R-Ye BRIdlingPulse generation
(See page DI-252)
G1 (B26) - G1 (B6)W e OIdlingPulse generation
(See page DI-215)
G2 (B25) - NE (B7)B-W e BRIdlingPulse generation
(See page DI-215)
NE (B27) - NE (B7)B-R e BRIdlingPulse generation
(See page DI-215)
M-REL (A24) - E1 (B69)GR e BRIG switch ON9 - 14
IG switch ONBelow 0.5
FPC (A22) - E1 (B69)V-W e BRIdlingPulse generation
(4.0 - 5.5)
DI (A21) - E1 (B69)G e BRIdling7.0 or more
EVAP (B74) - E01 (B80)V e BRIG switch ON9 - 14
EGR (B75) - E01 (B80)P e BRD posiiton stall rpm: 1,600 ~ 1,800 rpmPulse generation or
Below 2.0
EGR (B75) E01 (B80)P e BR
Idling9 - 14
ISC1 (B35) - E01 (B80)V-Y e BRIdling, When A/C Switch ON or OFFPulse generation
(See page DI-240)
ISC2 (B34) - E01 (B80)G-W e BRIdling, When A/C Switch ON or OFFPulse generation
(See page DI-240)
ISC3 (B33) - E01 (B80)G-O e BRIdling, When A/C Switch ON or OFFPulse generation
(See page DI-240)
Page 582 of 1807
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-167
395 Author: Date:
1997 SUPRA (RM502U) ISC4 (B32) - E01 (B80)
R-G e BRIdling, When A/C Switch ON or OFFPulse generation
(See page DI-240)
OX1 (B48) - E1 (B69)W e BRMaintain engine speed at 2,500 rpm for 2 min. after warning upPulse generation
(See page DI-193)
OXS (B47) - E1 (B69)R-L e BRMaintain engine speed at 2,500 rpm for 2 min. after warning upPulse generation
(See page DI-193)
HT1 (B71) E01 (B80)BLBRIdling after warning upBelow 3.0HT1 (B71) - E01 (B80)B-L e BRIG switch ON9 - 14
HTS (B72) E01 (B80)BR WBRIdling after warning upBelow 3.0HTS (B72) - E01 (B80)BR-W e BRIG switch ON9 - 14
KNK1 (B50) - E1 (B69)W e BRIdlingPulse generation
(See page DI-212)
KNK2 (B49) - E1 (B69)W e BRIdlingPulse generation
(See page DI-212)
NSW (B76) E1 (B69)BWBR
IG switch ON
Other shift position in ºPº or ºNº position9 - 14
NSW (B76) - E1 (B69)B-W e BRIG switch ON
Shift position in ºPº or ºNº position0 - 3.0
SPD (A2) - E1 (B69)P e BRIG switch ON
Rotate driving wheel slowlyPulse generation
(See page DI-238)
TE1 (A20) - E1 (B69)L e BRIG switch ON9 - 14
W (A6) E1 (B69)LBBRIdling9 - 14W (A6) - E1 (B69)L-B e BRIG switch ON0 - 3.0
OD1 (A12) - E1 (B69)BR-B e BRIG switch ON9 - 14
AC1 (A34) E1 (B69)LRBRA/C switch ON (At idling)0 - 1.5AC1 (A34) - E1 (B69)L-R e BRA/C switch OFF7.5 - 14
ACMG (A23) E01 (B80)WGBRA/C switch ON (At idling)0 - 3.0ACMG (A23) - E01 (B80)W-G e BRA/C switch OFF9 - 14
FPU (B73) E01 (B80)WLBRIG switch ON9 - 14FPU (B73) - E01 (B80)W-L e BRRestarting at high engine coolant temp.Below 2.0
ELS (A15) E1 (B69)RYBRDefogger switch or taillight switch ON7.5 - 14ELS (A15) - E1 (B69)R-Y e BRDefogger switch and taillight switch OFF-0.1 - 1.5
SDL (A8) - E1 (B69)G e BRDuring transmissionPulse generation
VSV1 (B40) E1 (B69)GBBRImmediately after racingBelow 3.0VSV1 (B40) - E1 (B69)G-B e BRIdling9 - 14
VSV2 (B39) E1 (B69)GYBRFor 2 sec. after IG switch ON to OFFBelow 3.0VSV2 (B39) - E1 (B69)G-Y e BRIdling9 - 14
VSV3 (B38) - E1 (B69)B-Y e BRIdling9 - 14
VSV4 (B60) - E1 (B69)L-W e BR
Idling and other shift position ºPº or ºNº position (for A/T).
Idling (for M/T)Below 3.0VSV4 (B60) E1 (B69)LW e BR
Idling and shift position ºPº or ºNº position (for A/T)9 - 14
IG switch ON2.3 - 3.0
PIM1 (B62) - E2 (B65)B-Y e W-BIG switch ON and apply vacuum 26.7 kPa
(200 mm Hg, 7.9 in. Hg)1.0 - 1.5
EFI+ (A27) - E2 (B65)B e W-BIG switch ONPulse generation
(See page DI-285)
EFI- (A26) - E2 (B65)W e W-BIG switch ONPulse generation
(See page DI-285)
Page 583 of 1807
DI-168
- DIAGNOSTICSENGINE (2JZ-GTE)
396 Author: Date:
1997 SUPRA (RM502U) ETC+ (A14) - E2 (B65)
Y e W-BIG switch ONPulse generation
(See page DI-285)
ETC- (A13) - E2 (B65)BR e W-BIG switch ONPulse generation
(See page DI-285)
Page 584 of 1807
DI4SL-01
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-169
397 Author: Date:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
When the malfunction code is not confirmed in the DTC check and the problem still can not be confirmed
in the basic inspection, then proceed to this step and perform troubleshooting according to the numbered
order given in the table below.
SymptomSuspect AreaSee page
Does not start (Engine does not crank)1. Starter and Starter relayST-14, ST-16
Does not start (No initial combustion)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI-304
DI-248
IN-18
Does not start (No complete combustion)1. Fuel pump control circuitDI-248
Difficult to start (Engine cranks normally)
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI-301
DI-248
EM-3
Difficult to start (Cold engine)1. Starter signal circuit
2.Fuel pump control circuitDI-301
DI-248
Difficult to start (Hot engine)
1. Starter signal circuit
2. Fuel pressure control circuit
3. Fuel pump control circuitDI-301
DI-309
DI-248
Poor idling (High engine idle speed)1. A/C signal circuit
2. ECM power source circuitDI-722
DI-304
Poor idling (Low engine idle speed)1. A/C signal circuit
2. Fuel pump control circuitDI-722
DI-248
Poor idling (Rough idling)1. Compression
2. Fuel pump control circuitEM-3
DI-248
Poor idling (Hunting)1. ECM power source circuit
2. Fuel pump control circuitDI-304
DI-248
Poor Driveability (Hesitation/Poor acceleration)1. Fuel pump control circuit
2. A/T faultyDI-248
DI-391
Poor Driveability (Surging)1. Fuel pump control circuitDI-248
Engine stall (Soon after starting)1. Fuel pump control circuitDI-248
Engine stall (During A/C operation)1. A/C signal circuit
2. Engine control module (ECM)DI-722
IN-18
Page 585 of 1807
DI4SM-01
A00152
B+
Power Transistor
Thermistor
Platinum Hot Wire
Output
Voltage
B A
ThermistorPlatinum Hot
Wire
DI-170
- DIAGNOSTICSENGINE (2JZ-GTE)
398 Author: Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC P0100 Mass Air Flow Circuit Malfunction
CIRCUIT DESCRIPTION
The mass air flow meter uses a platinum hot wire. The hot wire air flow meter consists of a platinum hot wire,
thermistor and a control circuit installed in a plastic housing. The hot wire air flow meter works on the principle
that the hot wire and thermistor located in the intake air bypass of the housing detect any changes in the
intake air temperature.
The hot wire is maintained at the set temperature by controlling the current flow through the hot wire. This
current flow is then measured as the output voltage of the air flow meter.
The circuit is constructed so that the platinum hot wire and thermistor provide a bridge circuit, with the power
transistor controlled so that the potential of ºAº and ºBº remains equal to maintain the set temperature.
DTC No.DTC Detecting ConditionTrouble Area
Open or short in mass air flow meter circuit with engine speed
4,000 rpm or less
Open or short in mass air flow meter circuit
P0100Open or short in mass air flow meter circuit with engine speed
4,000 rpm or more
(2 trip detection logic)
Oen or short in mass air flow meter circuit
Mass air flow meter
ECM
If the ECM detects DTC ºP0100º it operates the fail safe function, keeping the ignition timing and injection
volume constant and making it possible to drive the vehicle.
HINT:
After confirming DTC P0100 use the OBD II scan tool or TOYOTA hand-held tester to confirm the mass air
flow ration from ºCURRENT DATAº.
Mass Air Flow Value (gm / sec.)Malfunction
0.0Mass Air flow meter power source open
VG circuit open or short
359.0 or moreVG - circuit open
Page 586 of 1807
FI6930
B-W
R/B No.22
2A
EFI No.1 B
BatteryEFI Main RelayB-R R/B No.2
B-Y
W-B
EBEA2
2
22
2 23
5
1
EA1
8
5
1
Mass Air Flow Meter2
5Y-R
B-RA
B
B 66
28
E2G
E1 VG GR24
M-RELB+ ECM
1
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-171
399 Author: Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect the OBD II scan tool or TOYOTA hand-held tester, and read value of
mass air flow rate.
RESULT:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the OBD II scan tool or TOYOTA hand-held tester main switch ON.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand-held tester.
RESULT:
Type IType II
Mass air flow rate0.0 gm / sec.359.0 gm / sec. or more
Type I Go to step 2.
Type II Go to step 5.