1999 TOYOTA CAMRY engine oil

± DIAGNOSTICSENGINE (5S±FE)
DI±103
338 Author: Date:
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
Camshaft position sensor (G signal) consist of signal plate and pickup coil.
The G signal plate has one tooth on its outer circumference and is mounted on the exhaust camshaft.
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 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 G signals
and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM during cranking
(2 trip detection logic)
Open or short in camshaft position sensor circuit

Camshaft position sensor
Di t ib tP0340No camshaft position sensor signal to ECM with engine speed
600 rpm or more
Distributor

Starter

ECM
WIRING DIAGRAM
Refer to DTC P0335 (Crankshaft Position Sensor ºAº Circuit Malfunction) on page DI±100.
DI014±09

± DIAGNOSTICSENGINE (5S±FE)
DI±163
398 Author: Date:
DTC P1300 Igniter Circuit Malfunction No.1
DTC P1310 Igniter Circuit Malfunction No.2
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs and ignition signal (IGT) 1 to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal O.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM. The ECM stops fuel
injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 4 consecutive IGT1 signals during
engine running
Open or short in IGF or IGT circuit from igniter to ECM

Ignition coil No.1 (Igniter No.1)

ECM
P1310No IGF signal to ECM for 4 consecutive IGT2 signals during
engine running
Open or short in IGF or IGT circuit from igniter to ECM

Ignition coil No.2 (Igniter No.2)

ECM
HINT:
Ignition coil No.1 is for cylinder No.1 and No.4, and ignition coil No.2 is for cylinder No.2 and No.3.
DI01G±06

A07122
IG Switch
B±R
BatteryEngine Room
J/B No.2
76B±R13
1II3B±R
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
Ignition
Coil
No.1
FL Block
Y±R
BR
B
20
19
IGT2
Tr1
E9
E9
E9
W±R
IGT1
IGF5 V
Tr1
Ignition Coil
No.2
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5 51B 1K
Instrument
W±R
W±R
2L 2A
4 1
AM2B
F4 F6 1
1
B±G
MAIN FL
3 1
4
J/C J25
*1: w/o Immobiliser
*2: w/ Immobiliser(*1) (*2)
ECM
E9 23
E9 22
E9 17
(*1) (*2)
W±R
Panel J/BB
B
BR
BR J19
J/C
DI±164
± DIAGNOSTICSENGINE (5S±FE)
399 Author: Date:
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P1300 is displayed, check ignition coil No.1 circuit.

If DTC P1300 is displayed, check ignition coil No.2 circuit.

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 Check for spark plug and spark of misifining cylinder (See page DI±89).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK

A03023A00417A03427
ON
IGF
(+)
w/o Immobiliser
w/ Immobiliser
IGF
(+)
± DIAGNOSTICSENGINE (5S±FE)
DI±165
400 Author: Date:
3 Disconnect ignition coil connectors, and check voltage between terminal IGF of
ECM connector and body ground.
PREPARATION:
(a) Disconnect the ignition coil connector.
(b) Remove the glove compartment (See page SF±64).
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal IGF of the ECM connector
and body ground.
OK:
Voltage: 4.5 ~ 5.5 V
OK Replace ignition coil.
NG
Check and replace ECM (See page IN±31).
4 Check for open and short in harness and connector in IGT1, 2 signal circuit be-
tween ECM and ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK

A03024A03428
START
IGT2 (+)
IGT1 (+)
w/o Immobiliser
w/ Immobiliser
IGT2 (+)
IGT1 (+)
BE6653A01761A01861
ON
START
1 (+)
± DIAGNOSTICSENGINE (5S±FE)
DI±167
402 Author: Date:
6 Disconnect ignition coil connectors, and check voltage between terminals IGT1,
2 of ECM connector and body ground.
PREPARATION:
(a) Disconnect the ignition coil connectors.
(b) Remove the glove compartment (See page SF±64).
CHECK:
Measure voltage between terminals IGT1, 2 of the ECM con-
nector and body ground when the engine is cranked.
OK:
Voltage: More than 0.1 V and less than 5 V
OK Replace ignition coil.

NG
7 Check ignition coil with igniter power source circuit.
PREPARATION:
Disconnect the ignition coil connector.
CHECK:
Measure voltage between terminal 1 of the ignition coil with the
igniter connector and body ground when the ignition switch is
turned to ON and STA position.
OK:
Voltage: 9 ~ 14 V
NG Repair ignition coil with igniter power source
circuit.
OK

DI±168
± DIAGNOSTICSENGINE (5S±FE)
403 Author: Date:
8 Check for open and short in harness and connector between ignition switch and
ignition coils (See page IN±31).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG±5).
NG Replace ignition coil.
OK
10 Check EFI main relay (Marking: EFI) (See page SF±40).
NG Replace EFI main relay.
OK
Replace igniter.

A07554
ECM
+B 12
E7 B±Y J/C
B
J28 J27B
B±Y
Instrument
Panel J/B 22J 2K7
W±R EFI
Relay 1 3
52
2F4
W±B
2A 1
AM2
42L
B
FL
Block
MAIN
FL
B±GEngine
J/B No.2
5
1B
531K71W
IGN
1K
Room
W±R
IG
Switch
7 6
14
E9
BR
B±R
EC
E1
F6
F4EB
B±R
1
1
EFI
J23
J/C A
A
Battery
BR
(*2) (*1)
*1: w/ Immobiliser
*2: w/o ImmobiliserE924 (*2)
MREL 7
E10 B±Y (*1) 6II4 B±W (*1)
± DIAGNOSTICSENGINE (5S±FE)
DI±179
414 Author: Date:
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI01L±05

A00325
BatteryMAIN IG Switch
AM2EFI
MAIN
FLStarter ST RelayPark/Neutral Position Switch
(Clutch Start Switch)EFI RelayCIR OPN Relay
Fuel Pump
ECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) IGN
STARTER ST
± DIAGNOSTICSENGINE (5S±FE)
DI±183
418 Author: Date:
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil and also current flows to terminal STA of ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil of the circuit
opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI01M±05