2001 TOYOTA SEQUOIA oil

± DIAGNOSTICSENGINE
DI±85
279 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0016 Crankshaft Position ± Camshaft Position
Correlation (Bank 1 Sensor A)
DTC P0018 Crankshaft Position ± Camshaft Position
Correlation (Bank 2 Sensor A)
CIRCUIT DESCRIPTION
VVT sensor (VVL or VVR signal) consist of a signal plate and pickup coil.
The VVL or VVR signal plate has 1 tooth on its outer circumference and is mounted on the intake camshafts.
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 actual camshaft angle is detected by the VVT sensor and it provides feedback to the ECM to control
the intake valve timing in response to during condition.
DTC No.DTC Detecting ConditionTrouble Area
No VVT sensor signal to ECM during cranking at 4 sec. or
more
P0016
P0018No VVT sensor signal to ECM with 5 sec. or more engine
speed 600 rpm or more
Open or short in VVT sensor circuit

VVT sensor

ECMP0018
While the crankshaft rotates twice, VVT sensor signal will be
input to ECM 5 times
ECM
MONITOR DESCRIPTION
The ECM optimizes the valve timing using the VVT (Variable Valve Timing) system to control the intake valve
camshaft. The VVT system includes the ECM, the OCV (Oil Control Valve) and the VVT controller. The ECM
sends a target duty±cycle control signal to the OCV. This control signal, applied to the OCV, regulates the
oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve cam-
shaft. The ECM calibrates the valve timing of the VVT system by setting the camshaft to the maximum retard
angle when the engine is idle. The ECM closes the OCV to retard the cam. The ECM stores this value as
VVT learning value (When the difference between the target valve timing and the actual valve timing is 5
degrees or less, the ECM stores this in its memory.).
If the learning value meets both of the following conditions ((a) and (b)), the ECM interprets this as a defect
in the VVT system and sets a DTC.
(a) VVT learning value is less than 20°CA (Crankshaft Angle) or more than 39°CA.
(b) Above condition continues for more than 18 sec.
DIAOO±02

A21043
Starter Relay EFI Relay
Circuit Opening
Relay
Fuel Pump RelayMREL
FPRTr2
Tr1 EFI No.1
IGNECM
FC
NE Fuel Pump
Battery
StarterFuel Pump Resistor
AM2Ignition Switch
STA
Crankshaft Position
Sensor (NE Signal)
± DIAGNOSTICSENGINE
DI±179
373 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0230 Fuel Pump Primary Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal STAR of the ECM to the starter
relay coil and also current flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, the Tr1 is turned ON, current flows to the coil of
the circuit opening relay, the relay switches on, power is supplied to the fuel pump, and the fuel pump oper-
ates.
While the NE signal is generated (engine running), the ECM keeps the Tr1 ON (circuit opening relay ON)
and the fuel pump also keeps operating.
The fuel pump speed is controlled at two levels (high speed or low speed) by the condition of the engine
(starting, light load, heavy load). When the engine starts (STA ON), the Tr2 in the ECM is OFF, so the fuel
pump relay closes and battery positive voltage is applied directly to the fuel pump. The fuel pump operates
at high speed.
After the engine starts while idling or light loads, since the Tr2 goes ON, power is supplied to the fuel pump
via the fuel pump resistor. The fuel pump operates at low speed.
DICEW±02

A19885
0.8 mm
(0.031 in.)
DI±194
± DIAGNOSTICSENGINE
388 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Remove the ignition coil assembly.
(b) Remove the spark plug.
CHECK:
(a) Check the electrode for carbon deposits.
(b) Check the spark plug type (See page IG±1).
(c) Check electrode gap.
OK:
No large carbon deposit present.
Not wet with gasoline or oil.
Electrode gap: 0.8 mm (0.031 in.)
NOTICE:
If adjusting the gap of a new spark plug, bend only ºthe
base / groundº electrode. Do not touch the tip. Never at-
tempt to adjust the gap of a used plug.
PREPARATION:
(a) Install the spark plug to the ignition coil assembly.
(b) Disconnect the injector connector.
(c) Ground spark plug.
CHECK:
Check if spark occurs while engine is being cracked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark occurs across electrode gap.
OK Go to step 8.
NG

A19431A19884
± DIAGNOSTICSENGINE
DI±195
389 Author: Date:
2005 SEQUOIA (RM1146U)
6 Change normal spark plug and check spark of misfiring cylinder.
PREPARATION:
(a) Change to the normal spark plug.
(1) Remove the spark plug that may be faulty from the
ignition coil assembly.
(2) Install another spark plug to the ignition coil assem-
bly.
(b) Disconnect the injector connector.
(c) Ground the spark plug.
CHECK:
Check if spark occurs while the engine is being cranked.
CAUTION:
Always disconnect each injector connector.
NOTICE:
Do not crank the engine for more than 2 seconds.
OK:
Spark jumps across electrode gap.
OK Replace spark plug.
NG

A21025
Wire Harness Side:
I1
I2
I3I4
I5I6
I7I8
Ignition Coil Connector
B17412
E8
IGF2
IGF1
ECM Connector DI±196
± DIAGNOSTICSENGINE
390 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check for open and short in harness and connector between ignition coil and
ECM.
Check the harness and connector between the ignition coil
and the ECM (IGF terminal) connectors:
PREPARATION:
(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil con-
nector.
(b) Disconnect the E8 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
Ignition coil (I1±2) ± IGF1 (E8±24)Below 1 W
Ignition coil (I2±2) ± IGF2 (E8±25)Below 1 W
Ignition coil (I3±2) ± IGF1 (E8±24)Below 1 W
Ignition coil (I4±2) ± IGF2 (E8±25)Below 1 W
Ignition coil (I5±2) ± IGF1 (E8±24)Below 1 W
Ignition coil (I6±2) ± IGF2 (E8±25)Below 1 W
Ignition coil (I7±2) ± IGF1 (E8±24)Below 1 W
Ignition coil (I8±2) ± IGF2 (E8±25)Below 1 W
Ignition coil (I1±2) or IGF1 (E8±24) ±
Body ground10 kW or higher
Ignition coil (I2±2) or IGF2 (E8±25) ±
Body ground10 kW or higher
Ignition coil (I3±2) or IGF1 (E8±24) ±
Body ground10 kW or higher
Ignition coil (I4±2) or IGF2 (E8±25) ±
Body ground10 kW or higher
Ignition coil (I5±2) or IGF1 (E8±24) ±
Body ground10 kW or higher
Ignition coil (I6±2) or IGF2 (E8±25) ±
Body ground10 kW or higher
Ignition coil (I7±2) or IGF1 (E8±24) ±
Body ground10 kW or higher
Ignition coil (I8±2) or IGF2 (E8±25) ±
Body ground10 kW or higher

A21025
Ignition Coil Connector
I1
I2
I3I4
I5I6
I7I8
Wire Harness Side:
B17412
E8
IGT8 IGT2
IGT4
IGT5IGT6IGT3 IGT7IGT1
ECM Connector
± DIAGNOSTICSENGINE
DI±197
391 Author: Date:
2005 SEQUOIA (RM1146U)
Check the harness and connector between the ignition coil
and the ECM (IGT terminal) connectors:
PREPARATION:
(a) Disconnect the I1, I2, I3, I4, I5, I6, I7 or I8 ignition coil con-
nector.
(b) Disconnect the E8 ECM connector.
CHECK:
Check the resistance between the wire harness side connec-
tors.
OK:
Standard:
Tester ConnectionSpecified Condition
Ignition coil (I1±3) ± IGT1 (E8±8)Below 1 W
Ignition coil (I2±3) ± IGT2 (E8±15)Below 1 W
Ignition coil (I3±3) ± IGT3 (E8±11)Below 1 W
Ignition coil (I4±3) ± IGT4 (E8±10)Below 1 W
Ignition coil (I5±3) ± IGT5 (E8±13)Below 1 W
Ignition coil (I6±3) ± IGT6 (E8±12)Below 1 W
Ignition coil (I7±3) ± IGT7 (E8±14)Below 1 W
Ignition coil (I8±3) ± IGT8 (E8±9)Below 1 W
Ignition coil (I1±3) or IGT1 (E8±8) ±
Body ground10 kW or higher
Ignition coil (I2±3) or IGT2 (E8±15) ±
Body ground10 kW or higher
Ignition coil (I3±3) or IGT3 (E8±11) ±
Body ground10 kW or higher
Ignition coil (I4±3) or IGT4 (E8±10) ±
Body ground10 kW or higher
Ignition coil (I5±3) or IGT5 (E8±13) ±
Body ground10 kW or higher
Ignition coil (I6±3) or IGT6 (E8±12) ±
Body ground10 kW or higher
Ignition coil (I7±3) or IGT7 (E8±14) ±
Body ground10 kW or higher
Ignition coil (I8±3) or IGT8 (E8±9) ±
Body ground10 kW or higher
OK Replace ignition coil with igniter, then confirm
that there is no misfire.
NG
Repair or replace harness or connector.

FI7059
FI7060A00069
G2 and NE Signal Waveforms
20 msec./Division (Idling)
10 msec./Division (Idling)5 V
/Division
G2
NE
5 V
/Division
G2
NE DI±210
± DIAGNOSTICSENGINE
404 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0335 Crankshaft Position Sensor ºAº Circuit
DTC P0339 Crankshaft Position Sensor ºAº Circuit In-
termittent
CIRCUIT DESCRIPTION
The crankshaft position sensor system consists of a crankshaft position sensor plate and a pick±up coil.
The sensor plate has 32 teeth and is installed on the crankshaft. The pick±up coil is made of an iron core
and magnet. The sensor plate rotates and as each tooth passes through the pick±up coil, a pulse signal is
created. The pick±up coil generates 32 signals for each engine revolution. Based on these signals, the ECM
calculates the crankshaft position and engine RPM. Using these calculations, the fuel injection time and igni-
tion timing are controlled.
DTC No.DTC Detecting ConditionTrouble Area
P0335
No crankshaft position sensor signal to ECM during crank-
ing (2 trip detection logic)
Open or short in crankshaft position sensor circuit

Crankshaft position sensor
P0335No crankshaft position sensor signal to ECM with engine
speed 450 rpm or more (1 trip detection logic)

Crankshaft osition sensor

Signal plate

ECM
P0339
In condition (a), (b) and (c), when no crankshaft position
sensor (NE) signal is input for 0.05 sec. or more. :
(1 trip detection logic)
(c) Engine revolution 1,000 rpm or more
(d) STA signal is OFF
(e) 3 sec. or more has lapsed after STA signal is switched
from ON to OFF.

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Signal plate

ECM
Reference: Inspection using the oscilloscope.
The correct waveform is as shown in the illustration.
Tester ConnectionSpecified Condition
VV1+ (E6±25) ± VV1± (E6±24)
VV2+ (E6±18) ± VV2± (E6±28)Correct waveform is as shown
NE+ (E6±21) ± NE± (E6±20)
Correct waveform is as shown
DID86±01

A21026
Component Side
C2
Crankshaft Position Sensor
± DIAGNOSTICSENGINE
DI±213
407 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:

Read freeze frame data using the hand±held tester. Freeze frame records the engine conditions when
a malfunction is detected. When troubleshooting it is useful for determining whether the vehicle was
running or stopped. the engine was warmed up or not, the air±fuel ratio lean or rich, etc. at the time
of the malfunction.

READ VALUE ON HAND±HELD TESTER
(a) Connect the hand±held tester to the DLC3.
(b) Start the engine and push the hand±held tester tool main switch ON.
(c) When using hand±held tester, enter the following menu: ºDIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / ENGINE SPDº.

The engine speed can be confirmed in DATA LIST using the hand±held tester. If there are no NE sig-
nals from the crankshaft position sensor despite the engine revolving, the engine speed will be indi-
cated as zero. If voltage output of the crankshaft position sensor is insufficient, the engine speed will
be indicated as lower RPM (than the actual RPM).
1 Check resistance of crankshaft position sensor.
PREPARATION:
Disconnect the C2 crankshaft position sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2.
OK:
Standard:
Tester ConnectionSpecified Condition
1 ± 2985 to 1,600 W at cold
1 ± 21,265 to 1,890 W at hot
NOTICE:
º Coldº and ºHotº shown above mean the temperature of
the coils themselves. ºColdº is form ±10°C (14°F) to 50°C
(122°F) and ºHotº is from 50°C (122°F) to 100°C (212°F).
NG Replace crankshaft position sensor.
OK