1996 TOYOTA T100 check engine

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FI6961
Ohmmeter
E2
THA
Z11824
Voltmeter
VG
E3
Air
− SFI (5VZ−FE)MASS AIR FLOW (MAF) METER
SF−29
1996 TOYOTA T100 (RM449U)
INSPECTION
1. INSPECT MAF METER RESISTANCE
Using an ohmmeter, measure the resistance between terminals
THA and E2.
Between
terminalsResistanceTemperature
THA − E210 − 20 kΩ−20°C (−4°F)
THA − E24 − 7 kΩ0°C (32°F)
THA − E22 − 3 kΩ20°C (68°F)
THA − E20.9 − 1.3 kΩ40°C (104°F)
THA − E20.4 − 0.7 kΩ60°C (140°F)
THA − E20.2 − 0.4 kΩ80°C (176°F)
If the resistance is not as specified, replace the MAF meter.
2. INSPECT MAF METER OPERATION
(a) Connect the MAF meter connector.
(b) Using a voltmeter, connect the positive (+) tester probe to
terminal VG, and negative (−) tester probe to terminal E3.
(c) Blow air into the MAF meter, and check that the voltage
fluctuates.
If operation is not as specified, replace the MAF meter.
(d) Disconnect the MAF meter connector.

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P19944
P20279
− SFI (5VZ−FE)THROTTLE BODY
SF−31
1037 Author: Date:
1996 TOYOTA T100 (RM449U)
THROTTLE BODY
ON−VEHICLE INSPECTION
1. INSPECT THROTTLE BODY
(a) Check that the throttle linkage moves smoothly.
(b) w/ EGR:
Check the vacuum at each port.
Start the engine.
Check the vacuum with your finger.
Port nameAt idle3,500 rpm or more
ENo vacuumVacuum
RNo vacuumVacuum
2. INSPECT THROTTLE POSITION SENSOR
(a) Apply vacuum to the throttle opener.
(b) Disconnect the sensor connector.
(c) Using an ohmmeter, measure the resistance between
each terminal.
Throttle valve
conditionBetween
terminalsResistance
Fully closedVTA − E20.28 − 6.4 kΩ
Fully closedIDL − E20.5 kΩ or less
OpenIDL − E2Infinity
Fully openVTA − E22.0 − 11.6 kΩ
−VC − E22.7 − 7.7 kΩ
(d) Reconnect the sensor connector.

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Separator
Filter
Cap
S02081
S02082
P19943
SF−32
− SFI (5VZ−FE)THROTTLE BODY
1038 Author: Date:
1996 TOYOTA T100 (RM449U)
3. M/T:
INSPECT DASHPOT (DP)
(a) Allow the engine to warm up to normal operating tempera-
ture.
(b) Check the idle speed.
Idle speed:
700 ± 50 rpm
(c) Remove the cap, filter and separator from the DP.
(d) Maintain engine speed at 2,500 rpm or more.
(e) Plug the VTV hole with your finger.
(f) Release the throttle valve.
(g) Check the DP is set.
DP setting speed:
1,800 − 2,200 rpm
(h) If not as specified, adjust with the DP adjusting screw.
(i) Remove your finger from the hole and check that the en-
gine returns to idle speed in approx. 1 second.
(j) Reinstall the DP separator, filter and cap.
HINT:
Install the filter with the coarser surface facing the atmospheric
side (outward).
4. INSPECT THROTTLE OPENER
(a) Allow the engine to warm up to normal operating tempera-
ture.
(b) Check the idle speed.
Idle speed:
700 ± 50 rpm
(c) Disconnect the vacuum hose from the throttle opener,
and plug the hose end.
(d) Check the throttle opener setting speed.
Throttle opener setting speed:
900 − 1,950 rpm
If the throttle opener setting is not as specified, replace the
throttle body.
(e) Stop the engine.
(f) Reconnect the vacuum hose to the throttle opener.

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SF−33
1039 Author: Date:
1996 TOYOTA T100 (RM449U)
(g) Start the engine and check that the idle speed returns to
the correct speed.

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P19935
P20011
Throttle Lever
No Clearance
Throttle Stop Screw Vacuum
SF−36
− SFI (5VZ−FE)THROTTLE BODY
1996 TOYOTA T100 (RM449U)
INSPECTION
1. CLEAN THROTTLE BODY
(a) Using a soft brush and carburetor cleaner, clean the cast
parts.
(b) Using compressed air, clean all the passages and aper-
tures.
NOTICE:
To prevent deterioration, do not clean the throttle position
sensor and IAC valve.
2. INSPECT THROTTLE VALVE
(a) Apply vacuum to the throttle opener.
(b) Check that there is no clearance between the throttle stop
screw and throttle lever when the throttle valve is fully
closed.
Throttle valve fully closed angle: 10°
3. INSPECT THROTTLE POSITION SENSOR
(a) Apply vacuum to the throttle opener.
(b) Insert a thickness gauge between the throttle stop screw
and stop lever.
(c) Using an ohmmeter, measure the resistance between
each terminal.
Clearance between
lever and stop screwBetween
terminalsResistance
0 mm (0 in.)VTA − E20.28 − 6.4 kΩ
0.32 mm (0.013 in.)IDL − E20.5 kΩ or less
0.54 mm (0.021 in.)IDL − E2Infinity
Throttle valve fully
openVTA − E22.0 − 11.6 kΩ
−VC − E22.7 − 7.7 kΩ
4. IF NECESSARY, ADJUST THROTTLE POSITION SEN-
SOR
(a) Loosen the 2 set screws of the sensor.
(b) Apply vacuum to the throttle opener.
(c) Insert a 0.43 mm (0.017 in.) thickness gauge, between
the throttle stop screw and stop lever.
(d) Connect the test probe of an ohmmeter to the terminals
IDL and E2 of the sensor.
(e) Gradually turn the sensor clockwise until the ohmmeter
deflects, and secure it with the 2 set screws.

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SF−37
1996 TOYOTA T100 (RM449U)
(f) Recheck the continuity between terminals IDL and E2.
Clearance between
lever and stop screwContinuity (IDL − E2)
0.32 mm (0.013 in.)Continuity
0.54 mm (0.021 in.)No continuity

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P19970
SST
TE1 E1DLC1
DLC1
P21126
Ohmmeter RSC
+B
RSOIAC Valve
− SFI (5VZ−FE)IDLE AIR CONTROL (IAC) VALVE
SF−39
1045 Author: Date:
1996 TOYOTA T100 (RM449U)
IDLE AIR CONTROL (IAC) VALVE
ON−VEHICLE INSPECTION
1. INSPECT IAC VALVE OPERATION
(a) Initial conditions:
Engine at normal operating temperature
Idle speed check correctly
Transmission in neutral position
A/C switch OFF
(b) Using SST, connect terminals TE1 and E1 of the
DLC1.
SST 09843−18020
(c) After engine speed is kept at approx. 1,000 rpm for 5 se-
conds, check that it returns to idle speed.
If the engine speed operation is not as specified, check the IAC
valve, wiring and ECM.
(d) Remove the SST from the DLC1.
SST 09843−18020
2. INSPECT IAC VALVE RESISTANCE
NOTICE:
”Cold” and ”Hot” in the following sentences express the
temperature of the coils themselves. ”Cold” is from −10°C
(14°F) to 50°C (122°F) and ”Hot” is from 50°C (122°F) to
100°C (212°F).
(a) Disconnect the IAC valve connector.
(b) Using an ohmmeter, measure the resistance between ter-
minal +B and other terminals (RSC, RSO).
Resistance:
Cold: 17.0 − 24.5 Ω
Hot: 21.5 − 28.5 Ω
If resistance is not as specified, replace the IAC valve.
(c) Reconnect the IAC valve connector.
3. INSPECT AIR ASSIST SYSTEM
(a) Initial conditions:
Engine at normal operating temperature
Idle speed check correctly
Transmission in neutral position
A/C switch OFF

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SST
TE1 E1DLC1
P21055Plug Air Assist Hose
Disconnect
SF−40
− SFI (5VZ−FE)IDLE AIR CONTROL (IAC) VALVE
1046 Author: Date:
1996 TOYOTA T100 (RM449U)
(b) Using SST, connect terminals TE1 and E1 of the
DLC1.
SST 09843−18020
(c) After engine speed is kept at 900 − 1,300 rpm for 10 se-
conds, check that it returns to idle speed.
(d) Stop the engine.
(e) Disconnect the air assist hose from the IAC valve, and
plug it.
(f) Start the engine and check that the idle speed reaches
500 rpm or below (the engine may stall).
If the idle does not reach 500 rpm or below, check for a
leak between the air assist hoses, pipe and injectors.
(g) Remove the SST from the DLC1.
SST 09843−18020
(h) Reconnect the air assist hose to the IAC valve.