1996 TOYOTA T100 check engine

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

Downloaded from www.Manualslib.com manuals search engine DI−62
− 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.

Downloaded from www.Manualslib.com manuals search engine FI7059
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