1996 TOYOTA T100 check engine

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DI−276
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the circuit listed for that code in the table below and pro-
ceed to the page given.
*:  ... MIL lights up
DTC No.
(See Page)Detection ItemTrouble AreaMIL *Memory
P0500
3RZ−FE:
(DI−92)
5VZ−FE:
(DI−226)
Vehicle Speed Sensor
Malfunction
(No.1 Vehicle Speed Sensor)Open or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
Combination meter
ECM

P0710
(DI−287)Transmission Fluid Temperature
Sensor Malfunction
(ATF Temperature Sensor)Open or short in ATF temperature sensor circuit
ATF temperature sensor
ECM

P0750
(DI−289)Shift Solenoid A Malfunction
(Shift Solenoid Valve No.1)Shift solenoid valve No.1 is stuck open or closed
Valve body is blocked up or stuck
P0753
(DI−290)Shift Solenoid A Electrical
Malfunction
(Shift Solenoid Valve No.1)Open or short in shift solenoid valve No.1 circuit
Shift solenoid valve No.1
ECM

P0755
(DI−289)Shift Solenoid B Malfunction
(Shift Solenoid Valve No.2)Shift solenoid valve No.2 is stuck open or closed
Valve body is blocked up or stuck
P0758
(DI−290)Shift Solenoid B Electrical
Malfunction
(Shift Solenoid Valve No.2)Open or short in shift solenoid valve No.2 circuit
Shift solenoid valve No.2
ECM

P0770
(DI−294)Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)Shift solenoid valve SL is stuck open or closed
Valve body is blocked up or stuck
Lock−up clutch

P0773
(DI−296)Shift Solenoid E Electrical
Malfunction
(Shift Solenoid Valve SL)Open or short in shift solenoid valve SL circuit
Shift solenoid valve SL
ECM

P1700
(DI−300)Vehicle Speed Sensor No.2
Malfunction
(No.2 Vehicle Speed Sensor)Open or short in No.2 vehicle speed sensor circuit
No.2 vehicle speed sensor
ECM

P1780
(DI−306)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM


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DI−282
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the
circuits for each symptom in the order given in the charts on the following pages and proceed to the page
given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On−vehicle Repair Matrix Chart
Chapter 3: Off−vehicle Repair Matrix Chart
If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow
chart for each circuit, proceed to the circuit with the next highest number in the table to continue
the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then
check and replace the ECM.
Chapter 1: Electronic Circuit Matrix Chart
SymptomSuspect AreaSee page
No up−shift
(A particular gear, from 1st to 3rd gear, is not up−shifted)1. ECMDI−279
No up−shift (3rd → O/D)
1. O/D main switch & O/D OFF indicator light circuit
2. O/D cancel signal circuit
3. ECMDI−311
DI−309
DI−279
No down−shift (O/D → 3rd)1. ECMDI−279
No down−shift
(A particular gear, from 1st to 3rd gear, is not up−shifted)1. ECMDI−279
No lock−up1. Stop light swich circuit
2. ECMDI−316
DI−279
No lock−up off1. Stop light swich circuit
2. ECMDI−316
DI−279
Shift point too high or too low1. ECMDI−279
Up−shift to O/D from 3rd while O/D main switch is OFF1. O/D main switch & O/D OFF indicator light circuit
2. ECMDI−311
DI−279
Up−shift to O/D from 3rd while engine is cold1. ECMDI−279
No kick−down1. ECMDI−279
Engine stalls when starting off or stopping1. Stop light swich circuit
2. ECMDI−316
DI−279

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DI−288
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check ATF Temperature Sensor.
PREPARATION:
Remove the ATF temperature sensor.
CHECK:
Measure resistance between terminals of ATF temperature
sensor at 20°C (68°F) and 110°C (230°F).
OK:
Resistance:
20°C (68°F): Approx. 13.0 kΩ
11 0°C (230°F): Approx. 800 Ω
NG Replace ATF temperature sensor.
OK
2 Check harness and connector between ATF temperature sensor and ECM
(See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

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− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−289
1996 TOYOTA T100 (RM449U)
DTC P0750, P0755 Shift Solenoid A/B Malfunction (Shift
Solenoid Valve No.1/No.2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
trouble of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0750
P0755During normal driving, gear required by ECM does not match
actual gear
(2 trip detection logic)Shift solenoid valve No.1/No.2 is stuck open or closed
Valve body is blocked up or stuck
HINT:
Check the shift solenoid valve No.1 when DTC P0750 is output and check shift solenoid valve No.2 when
DTC P0755 is output.
INSPECTION PROCEDURE
1 Check shift solenoid valve No.1 or No.2 operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valve, check that the solenoid valve opens.
NG Replace shift solenoid valve No.1 or No.2.
OK
2 Check valve body (See page DI−282).
NG Repair or replace valve body.
OK
Repair or replace transmission (See page
AT−26, AT−33).
DI0VM−01

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NORMALSHIFT SOLENOID NO.1
MALFUNCTIONING
Solenoid valveNo.1 No.2GearSHIFT SOLENOID NO.2
MALFUNCTIONINGBOTH SOLENOIDS
MALFUNCTIONINGSolenoid valve
No.1 No.2GearSolenoid valve
No.1 No.2GearGear when shift selector is
manually operated
D
2
LON
ONOFF
ON
ON
OFF
OFF OFF
ON
ONOFF
ON
ON OFF
ON
ON ONOFF1st
2nd
3rd
O/D
1st
2nd
3rd
1st
2ndX
X
X
X
X
X
X
X
XON
ON
OFF
OFFON
ON
ON3rd 3rd
O/D
3rd
3rd
1st
2ndX
X
X
X
X
X
X
X
X OFF
OFF
ON
ON OFF OFF
OFF
ON
ON1st
O/D
3rd1st O/D O/D
3rd
1st
1stO/D O/D O/D
O/D
3rd 3rd
3rd
1st
1st
X: MalfunctionsON
ON3rd
3rd
DI−290
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunction, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
HINT:
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
ECM checks for open or short circuit in shift solenoid valves
No.1 and No.2 circuit when it changes
ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL
After ECM detects condition (a) or (b) continuously 2 times or
more in one−trip, it causes MIL light up until condition (a) or (b)
disappears
After that, if ECM detects condition (a) or (b) once, it starts
lighting up MIL again:
(a) Solenoid resistance is 8 Ω or less (short circuit) when sole-
noid is energized
(b) Solenoid resistance is 100 kΩ or more (open circuit) when
solenoid is not energized
Open or short in shift solenoid valve No.1/No.2 circuit
Shift solenoid valve No.1/No.2
ECM
DI0VP−02

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ECM
B+
B+ S1
S2 E2
E2 Transmission
Shift Solenoid
Valve No.1
Shift Solenoid
Valve No.21
211
17*
1
*2
*1: 3RZ−FE
*2: 5VZ−FEW
B−W W
BE7
E7 10
9*
2*1
B−W
B−W
To Cruise Control ECU
Q07641
Q07642D00006
3RZ−FE
5VZ−FES2
S1
S2
S1
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−291
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Measure resistance between terminal S1 or S2 of ECM connector and body
ground.
PREPARATION:
Disconnect the connector from the ECM.
CHECK:
Measure resistance between terminal S1 or S2 of ECM connec-
tor and body ground.
OK:
Resistance: 11 − 15 Ω
OK Check and replace ECM.
NG

Downloaded from www.Manualslib.com manuals search engine Q07643
Q07644
Q05336
D00007
3RZ−FE
5VZ−FES2
S1 S2
S1
S1
S2
S2
S1
S1
DI−292
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
2 Check harness and connector between ECM connector and automatic transmis-
sion solenoid connector.
PREPARATION:
Disconnect the solenoid connector from the automatic trans-
mission.
CHECK:
Check the harness and connector between terminal S1 or S2
of ECM connector and terminal S1 or S2 of solenoid connector.
OK:
There is no open and no short circuit.
NG Repair or replace harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine Q07645
Q07646D00005
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−293
1996 TOYOTA T100 (RM449U)
3 Check shift solenoid valve No.1 or No.2.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No.1 or No.2.
CHECK:
(a) Measure resistance between solenoid connector and so-
lenoid body.
(b) Connect positive lead to terminal of solenoid connector,
negative lead to solenoid body.
OK:
(a) Resistance: 11 − 15 Ω
(b) The solenoid makes an operating noise.
NG Replace solenoid valve.
OK
Repair or replace solenoid wire.