TOYOTA T100 1996 Factory Service Manual

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P19559
E7E6
E4
13
1 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 1213 1 2 3 4 5 6 7 8
14 15 16 1213 910 11 1 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 12
23
24 25 26
ECM Terminals
− DIAGNOSTICSENGINE (3RZ−FE)
DI−17
1996 TOYOTA T100 (RM449U)
TERMINALS OF ECM
For M/T
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4−1) − E1 (E7−14)B−G ↔BRAlways9 − 14
+B (E4−12) − E1 (E7−14)W−R ↔ BRIG switch ON9 − 14
VCC (E6−1) − E2 (E6−9)G−Y ↔ BR−BIG switch ON4.5 − 5.5
IDL (E6−12) − E2 (E6−9)Y−L↔BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0 − 3.0
IG switch ON, Throttle valve fully open9 − 14
VTA (E6−11) − E2 (E6−9)Y↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0.3 − 0.8
IG switch ON, Throttle valve fully open3.2 − 4.9
VG (E6−2) − E3 (E6−16)Y−R ↔BRIdling, N position, A/C switch OFF1.1 − 1.5
THA (E6−7) − E2 (E6−9)Y−G ↔BR−BIdling, Intake air temp. 20°C (68°F)0.5 − 3.4
THW (E6−4) − E2 (E6−9)G−Y ↔BR−BIdling, Engine coolant temp. 80°C (176°F) 0.2 − 1.0
STA (E4−11) − E1 (E7−14)B−W ↔ BRCranking6.0 or more
#10 (E7−12) − E01 (E7−13)W−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
#20 (E7−11) − E01 (E7−13)W ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
IGT (E7−20) − E1 (E7−14)B−L ↔BRIdlingPulse generation
(See page DI−103)
IGF (E7−3) − E1 (E7−14)B−Y ↔BR
IG switch ON, Disconnect igniter connectorBelow 2.0
IdlingPulse generation
(See page DI−103)
G (E7−5) − G− (E7−18)B ↔GIdlingPulse generation
(See page DI−66)
NE (E7−4) − NE− (E7−17)W ↔BIdlingPulse generation
(See page DI−66)
FC (E4−14) − E1 (E7−14)G−Y ↔BRIG switch ON9 − 14
EGR (E7−6) − E1 (E7−14)P ↔BRIG switch ON9 − 14
EVP (E7−23) − E1 (E7−14)W−G ↔ BRIG switch ON9 − 14
RSC (E7−9) − E1 (E7−14)V−Y ↔ BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−10) − E1 (E7−14)V−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
OX1 (E6−6) − E1 (E7−14)B ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U) HT1 (E7−2) − E03 (E7−25)
P−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
HT2 (E7−15) − E03 (E7−25)R−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
KNK (E6−13) − E1 (E7−14)B ↔BRIdlingPulse generation
(See page DI−63)
SP1 (E4−9) − E1 (E7−14)G ↔BRIG switch ON, Rotate driving wheel slowlyPulse generation
(See page DI−92)
TE1 (E6−15) − E1 (E7−14)V−W ↔BRIG switch ON9 − 14
W (E4−5) − E1 (E7−14)V ↔BRIdling9 − 14
IG switch ONBelow 3.0
ACT (E4−8) − E1 (E7−14)L−B ↔BRA/C switch OFF at idling9 − 14
A/C switch ON at idlingBelow 2.0
AC1 (E4−10) − E1 (E7−14)B−R ↔BRA/C switch ON at idlingBelow 2.0
A/C switch OFF idling9 − 14

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1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 261 2 3 4 5 6 7 8
9 10 11 12 13 14 15 161 2 3 4 5 6
7 8 9 10 11 121 2 3 4 5 6 7 8 9 10 11
14 15 16 17 18 19 20 21 22 1213
E7 E6 E5 E4
ECM Terminals
− DIAGNOSTICSENGINE (3RZ−FE)
DI−19
1996 TOYOTA T100 (RM449U)
For A/T
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4−2) − E1 (E7−24)B−G ↔BRAlways9 − 14
+B (E4−12) − E1 (E7−24)W−R ↔ BRIG switch ON9 − 14
VCC (E6−1) − E2 (E6−9)G−Y ↔ BR−BIG switch ON4.5 − 5.5
IDL (E6−11) − E2 (E6−9)Y−L↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0 − 3.0
IG switch ON, Throttle valve fully open9 − 14
VTA (E6−10) − E2 (E6−9)Y↔ BR−B
IG switch ON, Apply vacuum to throttle opener
Throttle valve fully closed0.3 − 0.8
IG switch ON, Throttle valve fully open3.2 − 4.9
VG (E6−2) − E3 (E6−3)Y−R ↔BRIdling, A/C switch OFF1.0 − 1.5
THA (E6−12) − E2 (E6−9)Y−G ↔BR−BIdling, Intake air temp. 20°C (68°F)0.5 − 3.4
THW (E6−4) − E2 (E6−9)G−Y ↔BR−BIdling, Engine coolant temp. 80°C (176°F) 0.2 − 1.0
STA (E4−11) − E1 (E7−24)B−W ↔ BRCranking6.0 or more
#10 (E7−12) − E01 (E7−13)W−R ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
#20 (E7−11) − E01 (E7−13)W ↔BR
IG switch ON9 − 14
IdlingPulse generation
(See page DI−58)
IGT (E7−23) − E1 (E7−24)B−L ↔BRIdlingPulse generation
(See page DI−103)
IGF (E7−17) − E1 (E7−24)B−Y ↔BR
IG switch ON, Disconnect igniter connectorBelow 2.0
IdlingPulse generation
(See page DI−103)
G (E5−11) − G− (E5−5)B ↔GIdlingPulse generation
(See page DI−66)
NE (E5−12) − NE− (E5−6)W ↔BIdlingPulse generation
(See page DI−66)
FC (E7−14) − E1 (E7−24)G−Y ↔BRIG switch ON9 − 14
EGR (E7−22) − E1 (E7−24)P ↔BRIG switch ON9 − 14
PRG (E5−1) − E1 (E7−24)W−G ↔BRIG switch ON9 − 14
RSC (E7−6) − E1 (E7−24)V−Y ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
RSO (E7−7) − E1 (E7−24)V−R ↔BRIG switch ON, Disconnect E7 of ECM connector9 − 14
OX1 (E6−5) − E1 (E7−24)B ↔BRMaintain engine speed at 2,500 rpm for 2 min. after
warming upPulse generation

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U) FPU (E7−4) − E1 (E7−24)
G ↔ BR
IG switch ON9 − 14
Restarting at high engine
coolant temp.0 − 3
HT1 (E7−3) − E03 (E7−25)P−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
HT2 (E7−16) − E03 (E7−25)R−G ↔BRIdlingBelow 3.0
IG switch ON9 − 14
KNK (E6−6) − E1 (E7−24)B ↔BRIdlingPulse generation
(See page DI−63)
NSW (E4−22) − E1 (E7−24)B−Y ↔BRIG switch ON, Other shift position in ”P”, ”N” position9 − 14
IG switch ON, Shift position in ”P”, ”N” position0 − 3.0
SP1 (E4−8) − E1 (E7−24)G ↔BRIG switch ON
Rotate driving wheel slowlyPulse generation
(See page DI−92)
TE1 (E6−7) − E1 (E7−14)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 idling9 − 14
A/C switch ON at idlingBelow 2.0
AC1 (E4−7) − E1 (E7−24)B−R ↔BRA/C switch ON at idlingBelow 2.0
A/C switch OFF idling9 − 14

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− DIAGNOSTICSENGINE (3RZ−FE)
DI−21
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
Engine does not crank (Does not start)1. Starter and starter relayST−15
No initial combustion (Does not start)1. ECM power source circuit
2. Fuel pump control circuitDI−11 5
DI−11 8
No complete combustion (Does not start)1. Fuel pump control circuitDI−11 8
Engine cranks normally (Difficult to start)
1. Starter signal circuit
2. Fuel pump control circuit
3. CompressionDI−11 0
DI−11 8
EM−3
Cold engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−11 0
DI−11 8
Hot engine (Difficult to start)1. Starter signal circuit
2. Fuel pump control circuitDI−11 0
DI−11 8
High engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. ECM power source circuitAC−79
DI−11 5
Low engine idle speed (Poor idling)1. A/C signal circuit (Compressor circuit)
2. Fuel pump control circuitAC−79
DI−11 8
Rough idling (Poor idling)1. Compression
2. Fuel pump control circuitEM−3
DI−11 8
Hunting (Poor idling)1. ECM power source circuit
2. Fuel pump control circuitDI−11 5
DI−11 8
Hesitation/Poor acceleration (Poor driveability)1. Fuel pump control circuit
2. A/T faultyDI−11 8
DI−282
Surging (Poor driveability)1. Fuel pump control circuitDI−11 8
Soon after starting (Engine stall)1. Fuel pump control circuitDI−11 8
During A/C operation (Engine stall)1. A/C signal circuit (Compressor circuit)
2. Engine control module (ECM)AC−79
IN−26

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FI6929 FI7109A00043
B+
Power Transistor
Platinum Hot Wire
Output Voltage
A
B Thermistor
Thermistor
Platinum Hot Wire DI−22
− DIAGNOSTICSENGINE (3RZ−FE)
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.DTC Detecting ConditionTrouble Area
P0100Open or short in mass air flow meter circuit with engine
speed 4,000 rpm or less (2 trip detection logic)Open or short in mass air flow meter circuit
Mass air flow meter
ECM
If the ECM detects DTC ”P0100” 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 ratio from ”CURRENT DATA”.
Mass Air Flow Value (gm/sec.)Malfunction
0.5Mass air flow meter power source circuit open
VG circuit open or short
202.2 or moreE3 circuit open

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From
IG SwitchBattery
R/B No.2
J/B No.1B−W
W−R
B−YEFI
IGN
EFI RelayW−R
B−Y
W−B
EA1
EA1
IE1
W−R
W−R
1A 1C
EA
2
222
2
2 2 3
4
17
31
22
E6E6
E6 E62
16 3 Y−R
BR
(M/T)(A/T)
VG
E3
E1W
9
9ECM
Mass Air Flow Meter 5
1
3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−23
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 rate (gm/sec.)0.5 gm/sec.202.2 gm/sec. or more
Type I Go to step 2.
Type II Go to step 5.

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P23803
A00055
ON
1 (+)
P23804
P23805
A00044
VG (+)
For A/T For M/T
VG (+)
DI−24
− DIAGNOSTICSENGINE (3RZ−FE)
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 be-
tween EFI main relay (Marking : EFI) 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 MF−50).
(b) Start the engine.
CHECK:
Measure voltage between terminal VG of ECM connector and
body ground while engine is idling.
OK:
Voltage:
1.0 − 1.5 V (A/C switch OFF)
OK Check and replace ECM (See page IN−26).
NG

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P23807
A00045
For A/T For M/T
E3
E3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−25
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 connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page MF−50).
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.

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0101 Mass Air Flow Circuit Range/Performance
Problem
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page DI−22.
DTC No.DTC Detecting ConditionTrouble Area
P0101
Conditions (a), (b) and (c) continue with engine speed 900
rpm or less:
(2 trip detection logic)
(a) Closed throttle position switch: ON
(b) Mass air flow meter output > 2.2 V
(c) THW  70°C (158°F)
Mass air flow meter
Conditions (a) and (b) continue with engine speed 1,850 rpm or
more:
(a) VTA  0.75 V
(b) Mass air flow meter output < 1.0 V
WIRING DIAGRAM
Refer to DTC P0110 (Intake Air Temp Circuit Malfunction) on page DI−27 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0101) being output?
YES Go to relevant DTC chart.
NO
Replace mass air flow meter.
DI0TD−02