1996 TOYOTA T100 engine

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DI−241
1996 TOYOTA T100 (RM449U)
DTC P1335 Crankshaft Position Sensor Circuit
Malfunction (during engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI−191.
DTC No.DTC Detecting ConditionTrouble Area
P1335No crankshaft position sensor signal to ECM with engine
speed 1,000 rpm or more
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Starter
ECM
WIRING DIAGRAM
Refer to DTC P0335 on page DI−191.
INSPECTION PROCEDURE
Refer to DTC P0335 on page DI−191.
DI0V6−01

Downloaded from www.Manualslib.com manuals search engine S00900
DI−242
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
DTC No.DTC Detecting ConditionTrouble Area
P1500No starter signal to ECM
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI9AG−01

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DI−243
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−148.
1 Connect the TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI−148).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine S00899
W−R
Battery1
222
R/B No.2
W
EFIB−GB−G 8
EA1214
(M/T)(A/T)E4 E4ECM
BATT DI−244
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is OFF for
use by the DTC memory and air−fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuitOpen in back up power source circuit
ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI0V8−01

Downloaded from www.Manualslib.com manuals search engine BE6653
P24217
P24330
A00125
LOCK
For M/T
For A/TBATT (+)
BATT (+)
FI7107
EFI Fuse
R/B No.2
− DIAGNOSTICSENGINE (5VZ−FE)
DI−245
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page SF−61).
CHECK:
Measure voltage between terminal BATT of ECM connector
and body ground.
OK:
Voltage: 9 − 14 V
OK Check and replace ECM (See page IN−26).
NG
2 Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the R/B No.2.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Check for short in all harness and
components connected to EFI fuse.
OK
Check and repair harness or connector
between battery, EFI fuse and ECM.

Downloaded from www.Manualslib.com manuals search engine DI−246
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1605 Knock Control CPU Malfunction
CIRCUIT DESCRIPTION
Refer to Knock Sensor 1, 2 Circuit Malfunction on page DI−188.
DTC No.DTC Detecting ConditionTrouble Area
P1605Engine control computer malfunction (for knock control)ECM
WIRING DIAGRAM
Refer to page DI−188 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P1605) being output?
YES Go to relevant DTC chart.
NO
Check and replace ECM (See page IN−26).
DI9AH−01

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DI−247
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L, or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery voltage, the voltage of the ECM internal power
source. If the shift lever is moved from the N position to the D position, this signal is used for air−fuel ratio
correction and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for ”R”, ”N”, ”2”
and ”L” and position
(2 trip detection logic)
Short in park/neutral position switch circuit
Park/neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or
more park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 ∼ 2,500 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
WIRING DIAGRAM
Refer to DTC P1780 on page DI−247.
INSPECTION PROCEDURE
Refer to DTC P1780 on page DI−247.
DI0V9−01

Downloaded from www.Manualslib.com manuals search engine A00772
W
SwitchIG
W
W W W
Park/Neutral
Position Switch
Clutch Start
Cancel Switch
Clutch
Start
SwitchStarter
Relay
StarterECM
STA
E1 11 1 3
E4 E7
IE1(M/T)(A/T) IE1 IE1
IA3
IA3
EB1
B−W (M/T)
BatteryB−W B−WB−W
B−W
B−W
B−W
W−B (A/T) W−B
(M/T)
B−R
B−R
(M/T)B−R
(M/T)
(M/T)
B−R (M/T) W−B (M/T)B−Y
W
R/B
No.2B (M/T)B
B(A/T)
B−O B−O
(A/T)
IC
IC
21
S1
1 1 13 3 15
2
1
2 12 3
15
26
2 2
ALT AM1
141 3622
5
615
2 2(M/T)
(A/T) (A/T) DI−248
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
Starter Signal Circuit
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
WIRING DIAGRAM
DI0VA−01