Page 1233 of 3115
DI-184
- DIAGNOSTICSENGINE
377 Author: Date:
2004 LAND CRUISER (RM1071U)
17 Check intake air temperature and mass air flow rate.
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
Check the intake air temperature.
(1) Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/INTAKE AIRº.
(2) Read its value displayed on the hand-held tester or the OBD II scan tool.
OK:
Equivalent to ambient temperature
CHECK:
Check the air flow rate.
(1) Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/MAFº.
(2) Read its value displayed on the hand-held tester or the OBD II scan tool.
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
Page 1234 of 3115

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-185
378 Author: Date:
2004 LAND CRUISER (RM1071U)
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
122.32 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 (warm up or allow to cool down) and repeat the test.
NG Replace
engine coolant temperature sensor.
OK
19 Switch step by number of misfire cylinder (Refer 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-3).
Page 1235 of 3115

A00068
KNK Signal Waveform
0.5 V
Division
0.5 V/
Division0 V
0 V5 msec./Division
0.2 msec./Division DI-186
- DIAGNOSTICSENGINE
379 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0325 Knock Sensor 1 Circuit (Bank 1 or Single
Sensor)
DTC P0330 Knock Sensor 2 Circuit (Bank 2)
CIRCUIT DESCRIPTION
Each knock sensor is fitted to the right bank and left bank of the cylinder block to detect engine knocking.
This sensor contains a piezoelectric element which generates a voltage when it becomes deformed. The
piezoelectric element sends a signal to the ECM, when the cylinder block vibrates due to knocking. If engine
knocking occurs, ignition timing is retarded to suppress it.
DTC No.DTC Detecting ConditionTrouble Area
P0325No signal of knock sensor 1 signal to ECM with engine speed
between 2,000 rpm and 5,400 rpmOpen or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM
P0330No signal of knock sensor 2 signal to ECM with engine speed
between 2,000 rpm and 5,400 rpmOpen or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM
HINT:
Bank 1 refers to the bank that includes cylinder No. 1.
Bank 2 refers the the bank that does not include cylinder No. 1.
Reference: INSPECTION USING OSCILLOSCOPE
With the engine racing (4,000 rpm), check the waveform
between terminals KNK1 and KNK2 of the ECM connec-
tor 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 0.13 msec. (Normal mode vibration
frequency of knock sensor: 8.1 kHz)
HINT:
If normal mode vibration frequency is not 8.1 kHz, the sensor
has malfunction.
DI1LQ-14
Page 1236 of 3115

- DIAGNOSTICSENGINE
DI-187
380 Author: Date:
2004 LAND CRUISER (RM1071U)
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.
The ECM also senses background engine noise with the knock sensor and uses this noise to check for faults
in the sensor. If the knock sensor signal level is too low for more than 10 sec., and if the knock sensor output
voltage is out of normal range, the ECM interprets this as a fault in the knock sensor and sets a DTC.
MONITOR STRATEGY
RltdDTCP0325Knock sensor (Bank 1) range check or rationalityRelated DTCsP0330Knock sensor (Bank 2) range check or rationality
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
Duration10 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Battery voltage10 V-
IdleOFF
Time after engine start5 sec.-
Engine coolant temperature60C (140F)-
Intake air amount per revolution0.45 g/rev-
Engine speed2,000 rpm5,400 rpm
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Sensor failure is indicated when the knock sensor output
level is below the specific threshold for:10 sec.
Page 1237 of 3115
A19967A20086
ECM
KNK1 1
E6 B2 K1
Knock Sensor 1
1
K2
Knock Sensor 21
2
KNK2 E6 EC1
EC *1: Shielded(*1)
3 EC1
W(*1)
B
W
J17
J/C
E
D
BRE
E
DBR
J17
J/C DI-188
- DIAGNOSTICSENGINE
381 Author: Date:
2004 LAND CRUISER (RM1071U)
WIRING DIAGRAM
Page 1238 of 3115

FI7050A01996A01997A19886
ECM
KNK1
KNK2 22
33
Female
Connector Male
Connector1
1EC1
E6
2 1
3 21
321
E6
EC1
Knock Sensor 1
Knock Sensor 2
- DIAGNOSTICSENGINE
DI-189
382 Author: Date:
2004 LAND CRUISER (RM1071U)
INSPECTION PROCEDURE
HINT:
DTC P0325 is for the bank 1 knock sensor circuit.
DTC P0330 is for the bank 2 knock sensor circuit.
Read freeze frame data using the hand-held tester or the OBD II scan tool. 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, as well as other data from the time when a malfunction occurred.
1 Connect OBD II scan tool or hand-held tester, and check knock sensor circuit.
PREPARATION:
(a) Connect the OBD II scan tool or hand-held tester to the
DLC3.
(b) Disconnect the EC1 connector.
(c) Connect the terminals of the disconnected EC1 male con-
nector and EC1 female as follows.
Male connector eFemale connector
Terminal 2 e Terminal 3
Terminal 3 e Terminal 2
(d) Turn ignition switch ON and push the OBD II scan tool or
hand-held tester main switch ON.
(e) After the engine is warmed up, perform quick racing to
4,000 rpm 3 times.
CHECK:
Check the DTC.
RESULT:
Type IDTC same as when vehicle brought in
P0325 " P0325 or P0330 " P0330
Type IIDTC different to when vehicle brought in
P0325 " P0330 or P0330 " P0325
Type II Go to step 3.
Type I
Page 1239 of 3115
DI-190
- DIAGNOSTICSENGINE
383 Author: Date:
2004 LAND CRUISER (RM1071U)
2 Check for open and short in harness and connector between EC1 connector and
ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
3 Check for open and short in harness and connector between EC1 connector and
knock sensor (See page IN-36).
HINT:
If DTC P0325 has changed to P0330, check the knock sensor circuit on the bank 1 side.
If DTC P0330 has changed to P0325, check the knock sensor circuit on the bank 2 side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.
Page 1240 of 3115

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
- DIAGNOSTICSENGINE
DI-191
384 Author: Date:
2004 LAND CRUISER (RM1071U)
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 34 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 34 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)
P0335No crankshaft position sensor signal to ECM with engine
speed 600 rpm or more (2 trip detection logic)
Open or short in crankshaftposition sensor circuit
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 1000 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.
Tester ConnectionSpecified Condition
G2+ (E7-27) - G2- (E7-32)Ct fi hNE+ (E7-25) - NE- (E7-24)Correct waveform is as shown
DIC2D-01