TOYOTA SEQUOIA 2001 Service Repair Manual

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.

B17411
#80
#70
#60
#50 #30
#20
#10
(+) (+)
(+)
(+)
(+) (+)(+)
#40(+)
E01 (±)
E8E6
DI±198
± DIAGNOSTICSENGINE
392 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check ECM terminal of misfiring cylinder.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between the terminals of the E6 and E8
ECM connectors.
OK:
Standard:
Tester ConnectionSpecified Condition
#10 (E6±2) ± E01 (E8±7)9 to 14 V
#20 (E6±3) ± E01 (E8±7)9 to 14 V
#30 (E6±4) ± E01 (E8±7)9 to 14 V
#40 (E6±5) ± E01 (E8±7)9 to 14 V
#50 (E6±6) ± E01 (E8±7)9 to 14 V
#60 (E6±7) ± E01 (E8±7)9 to 14 V
#70 (E8±3) ± E01 (E8±7)9 to 14 V
#80 (E8±2) ± E01 (E8±7)9 to 14 V
OK Go to step 11.
NG
9 Check injector resistance of misfiring cylinder (See page SF±24).
NG Replace injector.
OK

A21343
I9I10
I11I12
I13I14
I15I16
Wire Harness Side:
Injector Connector
B17413
E6
#40
#50#20
#10
#30
#60
#70
#80 E8
± DIAGNOSTICSENGINE
DI±199
393 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check for open and short in harness and connector between ignition SW and in-
jector, injector and ECM of misfiring cylinder.
PREPARATION:
(a) Disconnect the I9, I10, I11, I12, I13, I14, I15 or I16 injector
connector.
(b) Disconnect the E6 or E8 ECM connector.
CHECK:
Measure the resistance of the wire harness side connectors be-
tween the ECM and injector.
OK:
Standard:
Tester ConnectionSpecified Condition
Injector (I9±2) ± #10 (E6±2)Below 1 W
Injector (I10±2) ± #20 (E6±3)Below 1 W
Injector (I11±2) ± #30 (E6±4)Below 1 W
Injector (I12±2) ± #40 (E6±5)Below 1 W
Injector (I13±2) ± #50 (E6±6)Below 1 W
Injector (I14±2) ± #60 (E6±7)Below 1 W
Injector (I15±2) ± #70 (E8±3)Below 1 W
Injector (I16±2) ± #80 (E8±2)Below 1 W
Injector (I9±2) or #10 (E6±2) ±
Body ground10 kW or higher
Injector (I10±2) or #20 (E6±3) ±
Body ground10 kW or higher
Injector (I11±2) or #30 (E6±4) ±
Body ground10 kW or higher
Injector (I12±2) or #40 (E6±5) ±
Body ground10 kW or higher
Injector (I13±2) or #50 (E6±6) ±
Body ground10 kW or higher
Injector (I14±2) or #60 (E6±7) ±
Body ground10 kW or higher
Injector (I15±2) or #70 (E8±3) ±
Body ground10 kW or higher
Injector (I16±2) or #80 (E8±2) ±
Body ground10 kW or higher

A21343
I9I10
I11I12
I13I14
I15I16
Wire Harness Side:
Injector Connector
A21378
I18
Wire Harness Side:
Ignition Switch Connector
IG2
DI±200
± DIAGNOSTICSENGINE
394 Author: Date:
2005 SEQUOIA (RM1146U)
PREPARATION:
(a) Disconnect the I9, I10, I11, I12, I13, I14, I15 or I16 injector
connector.
(b) Disconnect the I18 ignition switch connector.
CHECK:
Measure the resistance the wire harness side connectors be-
tween the injector and ignition switch.
OK:
Standard:
Tester ConnectionSpecified Condition
Injector (I9±1) ± IG2 (I18±6)Below 1 W
Injector (I10±1) ± IG2 (I18±6)Below 1 W
Injector (I11±1) ± IG2 (I18±6)Below 1 W
Injector (I12±1) ± IG2 (I18±6)Below 1 W
Injector (I13±1) ± IG2 (I18±6)Below 1 W
Injector (I14±1) ± IG2 (I18±6)Below 1 W
Injector (I15±1) ± IG2 (I18±6)Below 1 W
Injector (I16±1) ± IG2 (I18±6)Below 1 W
Injector (I9±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I10±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I11±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I12±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I13±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I14±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I15±1) or IG2 (I18±6) ±
Body ground10 kW or higher
Injector (I16±1) or IG2 (I18±6) ±
Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
11 Check injector injection of misfiring cylinder (See page SF±29).
NG Replace injector.
OK

± DIAGNOSTICSENGINE
DI±201
395 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check compression pressure of misfiring cylinder (See page EM±3).
NG Repair or replace.
OK
13 Check valve clearance of misfiring cylinder (See page EM±4).
NG Adjust valve clearance.
OK
14 Switch step by number of misfire cylinder (Refer to the result of step 4).
High misfire rate cylinderProceed to
1 or 2 cylindersA
More than 3 cylindersB
B Check for intermittent problems
(See page DI±11).
A
15 Check valve timing (Check for looseness or a jumped tooth of timing belt)
(See page EM±9).
NG Adjust valve timing (Repair or replace timing
belt).
OK

DI±202
± DIAGNOSTICSENGINE
396 Author: Date:
2005 SEQUOIA (RM1146U)
16 Check fuel pressure (See page SF±7).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page SF±1).
OK
17 Check intake air temperature and mass air flow rate.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
Check the intake air temperature.
(1) When using hand±held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II /
DATA LIST / ALL / INTAKE AIR.
(2) Read its value displayed on the hand±held tester.
OK:
Equivalent to ambient temperature
CHECK:
Check the air flow rate.
(1) When using hand±held tester, enter the following menu: DIAGNOSIS/ENHANCED OBD II/DATA
LIST/ALL/MAF.
(2) Read its value displayed on the hand±held tester.
OK:
ConditionAir Flow Rate (gm/s)
Ignition switch ON (do not start engine)0
Idling4 to 6
Running without load (2,500 rpm)13 to 20
Idling to quickly acceleratingAir flow rate fluctuates
NG Replace mass air flow meter.
OK

S01196S01699
30
20
10
5
3
02040 0.11
0.3
0.2 0.52
60 80 100 ±20
(±4) (104) (140) (176)(32) (68) (212)
A21042
Ohmmeter
Acceptable
TEMPERATURE C (F)
RESISTANCE KW
± DIAGNOSTICSENGINE
DI±203
397 Author: Date:
2005 SEQUOIA (RM1146U)
18 Check engine coolant temperature sensor.
PREPARATION:
Remove the engine coolant temperature sensor.
CHECK:
Measure the resistance between the terminals of the engine
coolant temperature sensor.
Resistance:
Tester ConnectionSpecified Condition
1 ± 22.32 to 2.59 kW (20C (68F))
1 ± 20.310 to 0.326 kW (80C (176F))
NOTICE:
In case of checking the engine coolant temperature sensor
in the water, be careful not to allow water to go into the ter-
minals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed en-
gine coolant temperature sensor and read the resistance. Use
an infrared thermometer to measure the engine temperature in
the immediate vicinity of the sensor. Compare these values to
the resistance/temperature graph. Change the engine temper-
ature (by warming up or cooling down) and repeat the test.
NG Replace
engine coolant temperature sensor.
OK
19 Switch step by number of misfire cylinder (Refer to the result of step 4).
High misfire rate cylinderProceed to
1 or 2 cylindersA
More than 3 cylindersB
B Go to step 5.
A
Check for intermittent problems
(See page DI±11).

DI±204
± DIAGNOSTICSENGINE
398 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0325 Knock Sensor 1 Circuit (Bank 1 or Single
Sensor)
DTC P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or
Single Sensor)
DTC P0328 Knock Sensor 1 Circuit High Input (Bank 1
or Single Sensor)
DTC P0330 Knock Sensor 2 Circuit (Bank 2)
DTC P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
DTC P0333 Knock Sensor 2 Circuit High Input (Bank 2)
CIRCUIT DESCRIPTION
A flat type knock sensor (non±resonant type) has the structure that can detect the vibration in a wider band
of frequency from about 6 kHz to 15 kHz and has the following features.
Knock sensors are fitted on the right bank and left bank of the cylinder block to detect engine knocking.
Each knock sensor contains a piezoelectric element which generates voltage when it becomes deformed.
Generation of the voltage occurs when the cylinder block vibrates due to knocking. If engine knocking oc-
curs, the ignition timing is retarded in order to suppress the knocking.
DTC No.DTC Detection ConditionTrouble Area
P0325
P0330Knock sensor signal level remains at low
(1 trip detection logic)
Knock sensor 1 or 2

Knock sensor 1 or 2 (looseness)

ECM
P0327
P0332Output voltage of the knock sensor 1 or 2 is 0.5 V or less
(1 trip detection logic)
Short in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

ECM
P0328
P0333Output voltage of the knock sensor 1 or 2 is 4.5 V or more
(1 trip detection logic)
Open in knock sensor 1 or 2 circuit

Knock sensor 1 or 2

ECM
DIDFS±01

A23648
GND 1V/ DIV KNK1 Signal Waveform
1 msec./ Division
± DIAGNOSTICSENGINE
DI±205
399 Author: Date:
2005 SEQUOIA (RM1146U)
Reference: Inspection using the oscilloscope.
The correct waveform is as shown.
ItemDetails
Terminal
KNK1 ± EKNK
or
KNK2 ± EKN2
Equipment Settings0.01 to 10 V/Division,
0.01 to 10 msec./Division
ConditionAfter warming up the engine,
keep the engine speed at 4,000 rpm.
MONITOR DESCRIPTION
The knock sensor located on the cylinder block detects spark knock.
When spark knock occurs, the sensor pick±up vibrates in a specific frequency range. When the ECM detects
the voltage in this frequency range, it retards the ignition timing to suppress the spark knock.
If there is a defect in the knock sensor or an open or short circuit, the voltage level will deviate outside the
normal operating range. The ECM interprets this deviation as a defect in the knock sensor and sets a DTC.
Example:
When the knock sensor voltage output is less than 0.5 V, or more than 4.5 V, and if either the condition contin-
ues for more than 3 sec.
MONITOR STRATEGY
P0325Knock sensor (Bank 1) range check (Chattering)
P0327Knock sensor (Bank 1) range check (Low volt-
age)
RltdDTC
P0328Knock sensor (Bank 1) range check (High volt-
age)
Related DTCsP0330Knock sensor (Bank 2) range check (Chattering)
P0327Knock sensor (Bank 2) range check (Low volt-
age)
P0328Knock sensor (Bank 2) range check (High volt-
age)
Main sensors/componentsKnock sensor
Required sensors/componentsRelated sensors/components
Crankshaft position sensor, Camshaft position
sensor, Engine coolant temperature sensor,
Mass air flow meter
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever these
DTCs are not presentSee page DI±18
Battery voltage10.5 V±
Time after engine start5 sec.±

A23549
ECU
KNK1 21
E7
B GR
4 K1
Knock Sensor 1
(Bank 1)B 8
1 K2
Knock Sensor 2
(Bank 2)
1
20KNK2
E7
BR7
2
EB4 EB4
23
EB
EC 1
BR BR
BR
E (Shielded)
BR (Shielded)
EB4 EB4
EB4(Shielded)
(Shielded)
2G
RWW
G
REKN2
EKNK
E1 E6 E7
E7 29
28
BRE D
DJ42
J/C J42
J/C DI±206
± DIAGNOSTICSENGINE
400 Author: Date:
2005 SEQUOIA (RM1146U)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Knock sensor range check (Chattering) P0325, P0330:
Knock sensor voltageLess than 0.5 V, or more than 4.5 V
Knock sensor range check (Low voltage) P0327, P0332:
Knock sensor voltageLess than 0.5 V
Knock sensor range check (High voltage) P0328, P0333:
Knock sensor voltageMore than 4.5 V
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

DTC P0325, P0327 and P0328 are for the bank 1 knock sensor circuit.

DTC P0330, P0332 and P0333 are for the bank 2 knock sensor circuit.

Read freeze frame data using the hand±held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air±fuel ratio was lean or
rich, and other data from the time the malfunction occurred.