1996 TOYOTA T100 check engine

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KNK signal waveform
0.5 V
/Division
5 msec./Division
100 μsec./Division 0V
200 mV
/Division
0V DI−190
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check for open and short in harness and connector between EC1 connector and
knock sensor (See page IN−26).
HINT:
If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.
If DTC P0330 has changed to P0325, check the knock sensor circuit on the left bank side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.
Reference INSPECTION USING OSCILLOSCOPE
With the engine racing (4,000 rpm), measure between
terminal KNK1, KNK2 of ECM and body ground.
HINT:
The correct waveform is as shown.
Spread the time on the horizontal axis, and confirm that
period of the wave is 141 μsec (Normal mode vibration
frequency of knock sensor: 7.1 kHz).
HINT:
If normal mode vibration frequency is not 7.1 kHz, the sensor
is malfunctioning.

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FI7060
A00069
G, NE signal waveform
G
G NE
NE5 V
/Division
5 V
/Division 20 msec./Division (Idling)
10 msec./Division (Idling)
DI−192
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check resistance of crankshaft position sensor (See page IG−13).
Reference INSPECTION USING OSCILLOSCOPE
During cranking or idling, check between terminals G and G−,
NE and NE− of ECM
HINT:
The correct waveforms are as shown.
NG Replace crankshaft position sensor.
OK
2 Check for open and short in harness and connector between ECM and crank-
shaft position sensor (See page IN−26).
NG Repair or replace harness or connector.
OK

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DI−193
1996 TOYOTA T100 (RM449U)
3 Inspect sensor installation and teeth of signal plate.
NG Tighten the sensor. Replace signal plate.
OK
Check and replace ECM (See page IN−26).

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− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The camshaft position sensor which detects the crankshaft angle signal (G signal), has been installed on
the front of right bank cylinder head. The timing rotor has been integrated with the right bank camshaft timing
pulley. When the camshafts rotate, the protrusion on the timing rotor and the air gap on the pickup coil
change, causing fluctuations, in the magnetic field and generating an electromotive force in the pickup coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G signals
and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)Open or short in camshaft position sensor circuit
Camshaft position sensor
Starter
ECM
No camshaft position sensor signal to ECM with engine
speed 600 rpm or more
WIRING DIAGRAM
Refer to DTC P0335 on page DI−191.
INSPECTION PROCEDURE
1 Check resistance of camshaft position sensor (See page IG−1).
Reference INSPECTION USING OSCILLOSCOPE
Refer to DTC P0335 on page DI−191.
NG Replace camshaft position sensor.
OK
2 Check for open and short in harness and connector between ECM and camshaft
position sensor (See page IN−26).
NG Repair or replace harness or connector.
OK
DI0UW−02

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DI−195
1996 TOYOTA T100 (RM449U)
3 Inspect sensor installation.
NG Tighten the sensor.
OK
Check and replace ECM (See page IN−26).

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Vehicle Speed
70 ∼ 90 km/h
(43 ∼ 56 km/h)
Idling
IG SW OFF(2)
(1)(3)
(4)(5)
(6)
Warm up 3 ∼ 5 min. 3 ∼ 5 min. 2 min. 2 min.
Time
− DIAGNOSTICSENGINE (5VZ−FE)
DI−197
1996 TOYOTA T100 (RM449U)
SYSTEM CHECK DRIVING PATTERN
(1) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(2) Start and warm up the engine with all the accessories switched OFF.
(3) Run the vehicle at 70 − 90 km/h (43 − 56 mph) for 3 min. or more.
(4) Idle the engine for about 2 min.
(5) Do steps (3) and (4) again.
(6) Check the ”READINESS TESTS” mode on the OBD II scan tool or TOYOTA hand−held tester.
If ”COMPL” is displayed and the MIL does not light up, the system is normal.
If ”INCMPL” is displayed and the MIL does not light up, run the vehicle step (5) from some time and check
it.
HINT:
”INCMPL” is displayed when either condition (a) or (b) exists:
(a) The system check is incomplete.
(b) There is a malfunction in the system.
If there is a malfunction in the system, the MIL will light up after steps (2) to (5) above are done.

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P19555
A00046
ECM ON
2
1922
(M/T)(A/T)THG
E25 V
E1 E6 E6
E6 E6
EGR Gas Temp.
Sensor
14 21
DI−198
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and read value of EGR gas temp. value.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand−held tester main switch ON.
CHECK:
Read EGR gas temp. on the TOYOTA hand−held tester.
OK:
EGR gas temp.: 10°C (50°F) or more
HINT:
If there is an open circuit, the TOYOTA hand−held tester indicates 3.1°C (37.6°F).
OK Go to step 4.
NG
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the EGR gas temp. sensor connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read EGR gas temp. on the TOYOTA hand−held tester.
OK:
EGR gas temp.: 159°C (318.2°F)
OK Confirm good connection at sensor.
If OK, replace EGR gas temp. sensor.
NG

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A00780
EGR Gas Temp.
Sensor
2
114 3
922
E6 E6
E6 E6
(M/T)(A/T)THG5 V
E2
E1
For M/T
For A/TTHG E2
E2 THG
ON
− DIAGNOSTICSENGINE (5VZ−FE)
DI−199
1996 TOYOTA T100 (RM449U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Connect between terminals THG and E2 of the ECM con-
nector.
HINT:
The EGR gas temp. sensor connector is disconnected.
Before checking, do a visual check and contact pressure check
for the ECM connector (See page IN−26).
CHECK:
Read EGR gas temp. on the TOYOTA hand−held tester.
OK:
EGR gas temp.: 159°C (318.2°F)
OK Open in harness between terminals E2 or THG.
Repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.