1996 TOYOTA T100 engine

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (5VZ−FE)
DI−145
1996 TOYOTA T100 (RM449U) Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
IGT2 (E7− 22) − E1 (E7−24)BR−B ↔BRIdlingPulse generation
(See page DI−235)
IGT3 (E7−31) − E1 (E7−24)B−W ↔BRIdlingPulse generation
(See page DI−235)
IGF (E7−17) − E1 (E7−24)B−Y ↔BR
IG switch ON, Disconnect igniter connector4.5 − 5.5
IdlingPulse generation
(See page DI−235)
G (E5−11) − G− (E5−5)B ↔WIdlingPulse generation
(See page DI−191)
NE (E5−12) − NE− (E5−6)G ↔LIdlingPulse generation
(See page DI−191)
FPU (E7−19) − E1 (E7−24)R−B ↔BRIG switch ON9 − 14
Idling0 − 3.0
EGR* (E7−18) − E1 (E7−24)R−W ↔BRIG switch ON9 − 14
THG* (E6−14) −E2( E6−9)P ↔BR−BIG switch ON4.5 − 5.5
EVP1 (E7−5) − E1 (E7−24)W−G ↔BRIG switch ON9 − 14
RSC (E7−6) − E1 (E7−24)B−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−7) − E1 (E7−24)BR−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
ACV (E7−2) − E1 (7−24)B−R ↔ BRIdling, A/C switch ON0 − 3
Idling, A/C switch OFF9 − 14
FC (E7−14) − E1 (E7−24)G−Y ↔ BRIG switch ON9 − 14
Idling0 − 3
OX1 (E6−5) − E1 (E7−24)W ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation
(See page DI−172)
OX2 (E6−13) − E1 (E7−24)R ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation
(See page DI−172)
HT1 (E5−3) − E03 (E5−7)P−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
HT2 (E5−9) − E03 (E5−7)R−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
KNK1 (E6−6) − E1 (E7−24)B ↔BRIdlingPulse generation
(See page DI−188)
KNK2 (E6−3) − E1 (E7−24)GR ↔BRIdlingPulse generation
(See page DI−188)
SP1 (E4−8) − E1 (E7−24)G ↔BRIG switch ON
Rotate driving wheel slowlyPulse generation
(See page DI−226)
TE1 (E6−7) − E1 (E7−24)V−W ↔BRIG switch ON9 − 14
W (E4−4) − E1 (E7−24)V ↔BRIdling9 − 14
IG switch ONBelow 3.0
ACT (E4−6) − E1 (E7−24)L−B ↔BRA/C switch OFF at IdlingBelow 2.0
A/C switch ON at idling5 or more
AC1 (E4−7) − E1 (E7−24)B−R ↔BRA/C switch ON at idlingBelow 2.0
A/C switch OFF at Idling9 − 14
SDL (E4−19) − E1 (E7−24)W ↔BRDuring transmissionPulse generation
*: Only for 2WD models with a load capacity of 0.5 ton and regular cab.

Downloaded from www.Manualslib.com manuals search engine FI6810
E7E6 E5 E4
34 33 32 31 30 29 28 2717 18 19 20 21 22 23 24 25 2611 12 13 14 15 161 2 3 4 5 6 7 8 9 101 2 3 4 5 6 7 8
9 10 11 12 13
14 15 16 17 18 19 20 21
22 23 24 25 26 27 28 1 2 3 4
5 6 7
8 9 10 11
12 13 14 15 16 1 2 3 4 5 6
7 8 9 10 11
12 13 14 15 16 17
18 19 20 21 22
ECM Terminals DI−146
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
For A/T
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4−14) − E1 (E5−16)B−G ↔BRAlways9 − 14
+B (E4−22) − E1 (E5−16)W−R ↔ BRIG switch ON9 − 14
VCC (E6−1) − E2 (E6−22)G−B ↔ BR−BIG switch ON4.5 − 5.5
VG (E6−8) − E3 (E6−18)GR−R ↔BR−WIdling, P or N position, A/C switch OFF1.1 − 1.5
THA (E6−14) − E2 (E6−22)Y−G ↔BR−BIdling, Intake air temp. 20°C (68°F)0.5 − 3.4
THW (E6−20) − E2 (E6−22)G−Y ↔BR−BIdling, Engine coolant temp. 80°C (176°F) 0.2 − 1.0
STA (E7−13) − E1 (E5−16)B−W ↔ BRCranking6.0 or more
#10 (E7−10) − E01 (E7−34)W−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
#20 (E7−9) − E01 (E7−34)W ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
#30 (E7−8) − E01 (E7−34)W−G ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
#40 (E7−7) − E01 (E7−34)Y−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
#50 (E7−6) − E01 (E7−34)W−L ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
#60 (E7−5) − E01 (E7−34)Y−B ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−183)
IGT1 (E7−24) − E1 (E5−16)B−L ↔BRIdlingPulse generation
(See page DI−235)
IGT2 (E7−25) − E1 (E5−16)BR−B ↔BRIdlingPulse generation
(See page DI−235)
IGT3 (E7−26) − E1 (E5−16)B−W ↔BRIdlingPulse generation
(See page DI−235)
IGF (E7−12) − E1 (E5−16)B−Y ↔BR
IG switch ON, Disconnect igniter connector4.5 − 5.5
IdlingPulse generation
(See page DI−235)
IDL (E7−32) − E2 (E6−22)Y−L ↔ BR−B
IG switch ON and apply vacuum to the throttle opener/THrottle
valve fully closed0 − 3
IG switch ON
Throttle valve fully open9 − 14

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (5VZ−FE)
DI−147
1996 TOYOTA T100 (RM449U) Symbols (Terminals No.)
Wiring ColorConditionSTD Voltage (V)
VTA (E6−7) − E2 (E6−22)Y−B ↔ BR−B
IG switch ON
Throttle valve fully closed0.3 − 0.8
IG switch ON
Throttle valve fully open3.2 − 4.9
G (E6−10) − G− (E6−11 )B ↔WIdlingPulse generation
(See page DI−191)
NE (E6−5) − NE− (E6−6)G ↔LIdlingPulse generation
(See page DI−191)
FPU (E5−9) − E1 (E5−16)R−B ↔BRIG switch ON9 − 14
Idling0 − 3.0
EGR* (E5−8) − E1 (E5−16)R−W ↔BRIG switch ON9 − 14
EVP1 (E5−15) − E1 (E5−16)W−G ↔BRIG switch ON9 − 14
THG* (E6−21) − E2 (E6−22)P ↔BR−BIG switch ON4.5 − 5.5
RSC (E7−22) − E1 (E5−16)B−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−23) − E1 (E5−16)BR−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
OX1 (E6−13) − E1 (E5−16)W ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation
(See page DI−172)
OX2 (E6−19) − E1 (E5−16)R ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation
(See page DI−172)
HT1 (E7−15) − E03 (E7−1)P−G ↔W−BIdlingBelow 3.0
IG switch ON9 − 14
HT2 (E7−16) − E03 (E7−1)R−G ↔W−BIdlingBelow 3.0
IG switch ON9 − 14
KNK1 (E6−17) − E1 (E5−16)B ↔BRIdlingPulse generation
(See page DI−188)
KNK2 (E6−16) − E1 (E5−16)GR ↔BRIdlingPulse generation
(See page DI−188)
NSW (E7−14) − E1 (E5−16)B−O ↔BRIG switch ON, Other shift position in ”P”, ”N” position9 − 14
IG switch ON, Shift position in ”P”, ”N” position0 − 3.0
SP1 (E4−12) − E1 (E5−16)G ↔BRIG switch ON
Rotate driving wheel slowlyPulse generation
(See page DI−226)
TE1 (E5−5) − E1 (E5−16)V−W ↔BRIG switch ON9 − 14
W (E5−3) − E1 (E5−16)V ↔BRIdling9 − 14
IG switch ONBelow 3.0
ACV (E5−10) − E1 (E5−16)B−R ↔ BRIdling, A/C switch ON0 − 3
Idling, A/C switch OFF9 − 14
ACT (E4−5) − E1 (E5−16)L−B ↔BRA/C switch OFF at idlingBelow 2.0
A/C switch ON at idling5 or more
AC1 (E4−20) − E1 (E5−16)B−R ↔BRA/C switch ON at idlingBelow 2.0
A/C switch OFF at idling9 − 14
SDL (E4−18) − E1 (E5−16)W ↔BRDuring transmissionPulse generation
OD1 (E4−7) − E1 (E5−16)Y−R ↔BRIG switch ON9 − 14
THG* (E6−12) − E2 (E6−22)P ↔BR−BIG switch ON3.9 − 5.0
FC (E5−4) − E1 (E5−16)G−Y ↔BRIG switch ON9 − 14
Idling0 − 3.0
*: Only for 2WD models with a load capacity of 0.5 ton and regular cab.

Downloaded from www.Manualslib.com manuals search engine DI0UF−01
DI−148
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)1. Starter and starter relayST−6
ST−14
No initial combustion (Does not start)
1. ECM power source circuit
2. Fuel pump control circuit
3. Engine control module (ECM)DI−251
DI−255
IN−26
No complete combustion (Does not start)1. Fuel pump control circuitDI−255
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI−248
DI−255
EM−2
Cold engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−248
DI−255
Hot engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−248
DI−255
High engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. ECM power source circuitAC−79
DI−251
Low engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuitAC−79
DI−255
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM−2
DI−255
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI−251
DI−255
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI−255
DI−282
Surging (Poor driveability)1. Fuel pump control circuitDI−255
Soon after starting (Engine stall)1. Fuel pump control circuitDI−255
During A/C operation (Engine stall)1. A/C signal circuit (Compressor circuit)
2. Engine control module (ECM)AC−79
IN−26

Downloaded from www.Manualslib.com manuals search engine DI0UG−01
FI6929
FI6972A00098
Power Transistor
Platinum Hot Wire
Output
Voltage Thermistor
AB
Platinum Hot Wire
Thermistor
B+
− DIAGNOSTICSENGINE (5VZ−FE)
DI−149
1996 TOYOTA T100 (RM449U)
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 temp.
The hot wire is maintained at the set temp. by controlling the current flow through the hot wire. This current
flow is ten 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 A and B remains equal to maintain the set temp.
DTC No.Detection ItemDTCTrouble Area
P0100Open 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
Mass air flow meter
ECM
P0100
Open or short in mass air flow meter circuit with engine
speed 4,000 rpm or more
(2 trip detection logic)
If the ECM detects DTC ”P0100” it operates the fail sefe 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 ratio from ”CURRENT DATA”.
Mass Air Flow Value (gm/sec.)Malfunction
Approx. 0Mass air flow meter power source circuit open
VG circuit open or short
11.0 − 25.1 (idling after warming up)E3 circuit open

Downloaded from www.Manualslib.com manuals search engine P19917
From
IG Switch
Mass Air Flow MeterBattery
R/B No.2
J/B No.1B−W
W−R
B−YEFI
IGN
EFI RelayW−R
B−Y
W−B
EA1EA1
IE1
W−R W−R
1A1C
EA
1
2
222
2
12
2
2 3 2
4
17
31
2
52
E6 E6
E6 E68
818
GR−R
BR−W
(M/T)(A/T)
VG
E3
E1
W
9
9ECM
DI−150
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of mass
air flow rate.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn the 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 rata (gm/sec.)Approx. 011.0 − 25.1 (idling after warming up)
Type I Go to step 2.
Type II Go to step 5.

Downloaded from www.Manualslib.com manuals search engine BE6653
P24310A00099
ON
1 (+)
P23805
P24311A00100
For M/T
For A/TVG (+)
VG (+)
− DIAGNOSTICSENGINE (5VZ−FE)
DI−151
1996 TOYOTA T100 (RM449U)
2 Check voltage of mass air flow meter power source.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal 1 of mass air flow meter con-
nector and body ground.
OK:
Voltage: 9 − 14 V
NG Check for open in harness and connector
between EFI main relay and mass air flow meter
(See page IN−26).
OK
3 Check voltage between terminals VG of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Start the engine.
CHECK:
Measure voltage between terminal VG of ECM connector and
body ground while engine is idling.
OK:
Voltage:
1.1 − 1.5 V (P or N position and A/C switch OFF)
OK Check and replace ECM (See page IN−26).
NG

Downloaded from www.Manualslib.com manuals search engine P24313
P24312A00101
For M/T
For A/TE3
E3
DI−152
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check for open and short in harness and connector between mass air flow meter
and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.
5 Check continuity between terminal E3 of ECM and body ground.
PREPARATION:
Remove the right cowl side trim (See page SF−61).
CHECK:
Check continuity between terminal E3 of ECM connector and
body ground.
OK:
Continuity (1 Ω or less)
NG Check and replace ECM (See page IN−26).
OK
6 Check for open in harness and connector between mass air flow meter and ECM
(See page IN−26).
NG Repair or replace harness or connector.
OK
Replace mass air flow meter.