check engine TOYOTA T100 1996 Factory Manual Online

Downloaded from www.Manualslib.com manuals search engine P03792
P25086
A00065
DI−60
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Disconnect the high−tension cord.
(b) Remove the spark plug.
CHECK:
(a) Check the carbon deposits electrode.
(b) Check the electrode gap.
OK:
(1) No large carbon deposit present. Not wet with gas-
oline or oil.
(2) Electrode gap: 0.8 mm (0.031 in.)
PREPARATION:
(a) Install the spark plug to the high−tension code.
(b) Disconnect the injector connector.
(c) Ground the spark plug.
CHECK:
Check if the spark occurs while the engine is being craked.
NOTICE:
To prevent excess fuel being injected from the injectors
during this test, don’t crank the engine for more than 5 − 10
seconds at a time.
OK:
Spark jumps across electrode gap.
NG Replace or check ignition system (See page
IG−1).
OK

Downloaded from www.Manualslib.com manuals search engine BE6653
P23816
P23817
A00066
For M/T
#10 (+) #20 (+)
#10 (+) #20 (+)
For A/T
− DIAGNOSTICSENGINE (3RZ−FE)
DI−61
1996 TOYOTA T100 (RM449U)
2 Check voltage of ECM terminal for injector of failed cylinder.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between applicable terminal of ECM connec-
tor and body ground.
OK:
Voltage: 9 − 14 V
OK Go to step 4.
NG
3 Check resistance of injector of misfiring cylinder (See page MF−16).
NG Replace injector.
OK
Check for open and short in harness and con-
nector between injector and ECM (See page
IN−26).
4 Check fuel pressure (See page MF−5).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page MF−10).
OK

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− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
5 Check injector injection (See page MF−16).
NG Replace injector.
OK
6 Check EGR system (See page EC−7).
NG Repair EGR system.
OK
7 Check mass air flow meter and engine coolant temp. sensor (See page DI−22,
DI−33).
NG Repair or replace.
OK
Check compression pressure, valve clear-
ance and valve timing.

Downloaded from www.Manualslib.com manuals search engine AB0117
P23818
P24201
A00067
LOCK
For M/T
For A/TKNK
KNK
E6 Connector
E6 Connector
DI−64
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check continuity between terminal KNK of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−51).
(b) Disconnect the E6 connector of ECM.
CHECK:
Measure resistance between terminal KNK of ECM connector
and body ground.
OK:
Resistance: 1 MΩ or higher
OK Go to step 3.
NG
2 Check knock sensor (See page MF−47).
NG Replace knock sensor.
OK
3 Check for open and short in harness and connector between ECM and knock
sensor (See page IN−26).
NG Repair or replace harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine A00068
KNK signal waveform
0.5 V/
Division
0.5 V/
Division0 V
0 V5 msec./Division
100 μsec./Division
− DIAGNOSTICSENGINE (3RZ−FE)
DI−65
1996 TOYOTA T100 (RM449U)
4 Does malfunction disappear when a good knock sensor is installed?
YES Replace knock sensor.
NO
Check and replace ECM (See page IN−26).
Reference: INSPECTION USING OSCILLOSCOPE
With the engine racing (4,000 rpm), measure between
terminal KNK 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 151 μsec (Normal mode vibration
frequency of knock sensor: 6.6 kHz).
HINT:
If normal mode vibration frequency is not 6.6 kHz the sensor is
malfunctioning.

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FI7060
A00069
G, NE signal waveform
5 V/
Division
5 V/
Division G
NE
G
NE20 msec./Division (Idling)
10 msec./Division (Idling)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−67
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check resistance of crankshaft position sensor (See page IG−14).
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

Downloaded from www.Manualslib.com manuals search engine DI−68
− DIAGNOSTICSENGINE (3RZ−FE)
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).

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−69
1996 TOYOTA T100 (RM449U)
DTC P0336 Crankshaft Position Sensor ”A” Circuit
Range/Performance
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI−66.
If the ECM records the DTC P0336, it operates the fail safe function, stopping the fuel injection.
DTC No.DTC Detecting ConditionTrouble Area
P0336Deviation on crankshaft position sensor signal and camshaft
position sensor signalValve timing
Distributor installation
ECM
INSPECTION PROCEDURE
1 Check valve timing (See page EM−38).
NG Adjust valve timing.
OK
2 Check distributor installation (See page EM−5).
NG Reinstall distributor.
OK
Check and replace ECM (See page IN−26).
DI0TS−02

Downloaded from www.Manualslib.com manuals search engine DI−70
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
Camshaft position sensor (G signal) consist of signal plate and pickup coil. The G signal plate has one tooth
on its outer circumference and is built into the distributor.
When the camshafts rotate, the protrusion on the signal plate 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
Distributor
Starter
ECM
No camshaft position sensor signal to ECM during engine run-
ning
WIRING DIAGRAM
Refer to DTC P0335 on page DI−66.
INSPECTION PROCEDURE
1 Check resistance of camshaft position sensor (See page EM−3).
Reference: INSPECTION USING OSCILLOSCOPE
Refer to DTC P0335 on page DI−66.
NG Replace distributor housing.
OK
2 Check for open and short in harness and connector between ECM and
distributor (See page IN−26).
NG Repair or replace harness or connector.
OK
DI0TT−03

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−71
1996 TOYOTA T100 (RM449U)
3 Check air gap (See page EM−1).
NG Replace distributor housing.
OK
Check and replace ECM (See page IN−26).