TOYOTA CAMRY 1999 Service Repair Manual

A00221P25779
P23917
± DIAGNOSTICSENGINE (1MZ±FE)
DI±279
514 Author: Date:
2 Check spark plug and spark of misfiring cylinder.
PREPARATION:
(a) Remove the ignition coil (See page IG±7).
(b) Remove the spark plug.
CHECK:
(a) Check spark plug type.
(b) Check for carbon deposits on electrode.
(c) Check electrode gap.
OK:
(a) Twin ground electrodes type.
Recommended spark plug:
ND PK20TR11
NGK BKR6EKPB±11
(b) No large carbon deposit present.
Not wet with gasoline or oil.
(c) Electrode gap:
Standerd: 1.0 ± 1.1 mm (0.03937 ± 0.043 in.).
Maximum: 1.3 mm (0.051 in.).
PREPARATION:
(a) Install the spark plug to the ignition coil, and connect the
ignition coil the connector.
(b) Disconnect injector connector.
(c) Hold the end about 12.5 mm (0.5 in.) from the ground.
CHECK:
Check if spark occurs while engine is being cranked.
NOTICE:
To prevent excess fuel being injected from the
injectors during this test, don't crank the engine for more
than 5 ~ 10 sec. at a time.
OK:
Spark jumps across electrode gap.
NG Replace or check ignition system
(See page IG±1).
OK

A02024
ON
#10 #20 #30 #40 #50 #60(+) (+) (+) (+) (+) (+)
FI6588
FI6538
A00064
10 V
/Division10 V
/Division
GND GND
100 msec./Division (Idling)1 msec./Division (Idling)
Injection duration
(Magnification)
DI±280
± DIAGNOSTICSENGINE (1MZ±FE)
515 Author: Date:
3 Check voltage of ECM terminal for injector of failed cylinder.
PREPARATION:
(a) Remove the glove compartment (See page SF±73).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between applicable terminal of the ECM con-
nector and body ground.
OK:
Voltage: 9 ~ 14 V
Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
With the engine idling, measure between terminals #10 ~ #60 and E01 of ECM.
HINT:
The correct waveform is as shown.
OK Go to step 5.
NG

± DIAGNOSTICSENGINE (1MZ±FE)
DI±281
516 Author: Date:
4 Check resistance of injector of misfiring cylinder (See page SF±21).
NG Replace injector.
OK
Check for open and short in harness and
connector between injector and ECM
(See page IN±31).
5 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK
6 Check injector injection (See page SF±25).
NG Replace injector.
OK
7 Check EGR system (See page EC±11).
NG Replace EGR system.
OK

DI±282
± DIAGNOSTICSENGINE (1MZ±FE)
517 Author: Date:
8 Check mass air flow meter and engine coolant temp. sensor
(See pages SF±35, SF±63).
NG Repair or replace.
OK
Check compression pressure, valve
clearance and valve timing.

A03315
Knock Sensor 1
(On right bank)
Knock Sensor 2
(On left bank)EC1 1W
W1
2W
WECM
KNKR
KNKLE1
E1 EC1 1E11
E112827
± DIAGNOSTICSENGINE (1MZ±FE)
DI±283
518 Author: Date:
DTC P0325 Knock Sensor 1 Circuit Malfunction
DTC P0330 Knock Sensor 2 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensors are fitted one 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, which
occurs 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 knock sensor 1 signal to ECM with engine speed between
2,000 rpm and 5,600 rpm.
Open or short in knock sensor 1 circuit

Knock sensor 1 (looseness)

ECM
P0330No knock sensor 2 signal to ECM with engine speed between
2,000 rpm and 5,600 rpm.
Open or short in knock sensor 2 circuit

Knock sensor 2 (looseness)

ECM
If the ECM detects the above diagnosis conditions, it operates the fail±safe function in which the corrective
retard angle value is set to the maximum value.
WIRING DIAGRAM
DI07T±06

A00304
Knock SensorECM
EC1
Male
ConnectorFemale
Connector 1
1
11
22KNKR
KNKL
EC1
E6
E627
28
DI±284
± DIAGNOSTICSENGINE (1MZ±FE)
519 Author: Date:
INSPECTION PROCEDURE
HINT:

DTC P0325 is for the right bank knock sensor circuit. DTC P0330 is for the left bank knock sensor cir-
cuit.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand±held tester, and check knock sensor
circuit.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tes-
ter to the DLC3.
(b) Disconnect the wire to wire connector EC1.
(c) Connect the terminals of the disconnected EC1 male con-
nector and EC1 female as follows.
Male connector eFemale connector
Terminal 1 e Terminal 2
Terminal 2 e Terminal 1
(d) Turn the ignition switch ON and push the OBD II scan tool
or TOYOTA hand±held tester main switch ON.
(e) After the engine is warmed up, perform quick racing to
4,000 rpm three 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

FI6510FI6607A00113
KNK Signal Waveforms
0.5 V
/Division
5 msec./Division
100 msec./Division 0 V
200 mV
/Division
0 V
± DIAGNOSTICSENGINE (1MZ±FE)
DI±285
520 Author: Date:
Reference INSPECTION USING OSCILLOSCOPE

With the engine racing (4,000 rpm), measure between
terminals KNKR, KNKL of the ECM connector and body
ground.
HINT:
The correct waveforms are as shown.

Spread the time on the horizontal axis, and confirm that
period of the wave is 141 msec.
(Normal mode vibration frequency of knock sensor:
7.1 kHz)
HINT:
If normal mode vibration frequency is not 7.1 kHz, the sensor
is malfunctioning.
Type II Go to step 3 .
Type I
2 Check for open and short in harness and connector between EC1 connector and
ECM (See page IN±31).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±31).

DI±286
± DIAGNOSTICSENGINE (1MZ±FE)
521 Author: Date:
3 Check for open and short in harness and connector between EC1 connector and
knock sensor (See page IN±31).
HINT:

If DTC P0325 has changed to P0330, check the knock sensor circuit on the right bank side.

If DTC P0330 has changed to P0325, check the knock sensor circuit on the left bank side.
NG Repair or replace harness or connector.
OK
Replace knock sensor.

P25474
Camshaft Position Sensor
1
2
1
2B±W
B±RL
BR LECM
G22+
NE+
NE±
E2
E10
E10E11
2410
Crankshaft Position SensorB±R16
± DIAGNOSTICSENGINE (1MZ±FE)
DI±287
522 Author: Date:
DTC P0335 Crankshaft Position Sensor ºAº Circuit
Malfunction
CIRCUIT DESCRIPTION
Crankshaft position sensor (NE signal) consists of a signal plate and pickup coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G22 sig-
nals, and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0335
No crankshaft position sensor signal to ECM during cranking
(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 600 rpm or more (2 trip detection logic)

Crankshaft osition sensor

Starter

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

Perform troubleshooting of DTC P0335 first. If no trouble is found, troubleshoot the following mechani-
cal systems.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.
DI07U±06

FI7059
FI7060
A00069
G22, NE Signal Waveforms
G22
G22NE
NE5 V
/Division
5 V
/Division 20 msec./Division (Idling)
10 msec./Division (Idling)
DI±288
± DIAGNOSTICSENGINE (1MZ±FE)
523 Author: Date:
1 Check resistance of crankshaft position sensor (See page IG±12).
Reference INSPECTION USING OSCILLOSCOPE
During cranking or idling, check between terminals G22+ and
NE±, NE and NE± of the ECM connector.
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
crankshaft position sensor (See page IN±31).
NG Repair or replace harness or connector.
OK