TOYOTA CAMRY 1999 Service Repair Manual

A09277
FC ON
(±) (+)
DI±100
± DIAGNOSTICSENGINE
6 Check fuel shutoff valve for fuel pressure regulator (See page SF±30).
NG Replace fuel shutoff valve for fuel pressure reg-
ulator.
OK
Check for open in harness and connector between circuit opening relay (Marking: CIR OPN) and
fuel shutoff valve for fuel pressure regulator, and fuel shutoff valve for fuel pressure regulator
and ECM (See page IN±29).
OBD II scan tool (excluding TOYOTA hand±held tester):
1 Check for ECM power source circuit (See page DI±116).
NG Repair or replace.
OK
2 Check fuel shutoff valve for fuel pressure regulator (See page SF±30).
NG Replace circuit opening relay.
OK
3 Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Disconnect the E4 connector from the ECM.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal FC of the ECM connec-
tor and body ground.
OK:
Voltage 9 ± 14 V

A09424
ON
VCNG2
(±)
(+) E01
± DIAGNOSTICSENGINE
DI±101
OK Go to step 4.
NG
Check for open in harness and connector between EFI main relay (Marking: EFI) and circuit open-
ing relay (Marking: CIR OPN), and circuit opening relay and ECM (See page IN±29).
4 Check voltage between terminals VCNG2 and E01 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals VCNG2 and E01 of the
ECM connectors.
OK:
Voltage 9 ± 14 V
OK Check and replace ECM (See page IN±29).
NG
5 Check fuel shutoff valve for fuel pressure regulator (See page SF±30).
NG Replace fuel shutoff valve for fuel pressure reg-
ulator.
OK
Check for open in harness and connector between circuit opening relay (Marking: CIR OPN) and
fuel shutoff valve for fuel pressure regulator, and fuel shutoff valve for fuel pressure regulator
and ECM (See page IN±29).

DI±102
± DIAGNOSTICSENGINE
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, the counter electromotive force is 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

Ignition system

Open or short in IGF or IGT1 circuit from No.1 ignition coil
with igniter to ECM

No.1 ignition coil with igniter

ECM
P1310No IGF signal to ECM for 4 consecutive IGT2 signals during
engine running

Ignition system

Open or short in IGF or IGT2 circuit from No.2 ignition coil
with igniter to ECM

No.2 ignition coil with igniter

ECM
HINT:
No.1 ignition coil with igniter is for cylinder No.1 and No.4, and No.2 ignition coil is for cylinder No.2 and No.3.
DI01G±07

A09399
IG Switch
B±R
BatteryEngine Room
J/B No.2
763
1IG3
B
BR
Spark Plug
Spark Plug
2
3 2
3 4
Tr2 Igniter
No.1
No.1 Ignition
Coil with Igniter
FL Block
Y±R
BR
C
20
19
IGT2
Tr1
E6
E6
E6
W±R
IGT1
IGF5 V
Tr1
No.2 Ignition Coil
with Igniter
Igniter
No.2
AA A
EC
Tr2
W±R
B±R 5
1B 1K
Instrument
W±RW±R
2L 2A
4 1
AM2B
F9 F11 1
1
B±G
MAIN FL
3 1
4
J/C J9
ECM
W±R
Panel J/BC
CBR
BR J18
J/C
558
1C
1K
B±R
B±R12
± DIAGNOSTICSENGINE
DI±103
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

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

If DTC P1300 is displayed, check No.2 ignition coil 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 was warmed up or not, the air±fuel
ratio was lean or rich, etc. at the time of the malfunction.
1 Check for spark plug and spark of misfiling cylinder (See page IG±1).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and ignition coil with igniter (See page IN±29).
NG Repair or replace harness or connector.
OK

A09288BE6653A09269
ON
IGF
(±) (+)
A09287BE6653A09268
START
IGT2
IGT1
(±) (+) DI±104
± DIAGNOSTICSENGINE
3 Disconnect ignition coil with igniter connector, and check voltage between ter-
minal IGF of ECM connector and body ground.
PREPARATION:
(a) Disconnect the ignition coil with igniter connector.
(b) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal IGF of the ECM connec-
tor and body ground.
OK:
Voltage: 4.5 ± 5.5 V
OK Replace ignition coil with igniter.
NG
Check and replace ECM (See page IN±29).
4 Check for open and short in harness and connector in IGT1 and IGT2 signal cir-
cuits between ECM and ignition coil with igniter (See page IN±29).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminals IGT1, IGT2 of ECM connector and body
ground.
PREPARATION:
Remove the glove compartment (See Pub. No. RM654U, page
SF±64).
CHECK:
Measure the voltage between terminal IGT1, IGT2 of the ECM
connector and body ground when the engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V

FI6680
IGT and IGF Signal Waveforms
10 msec./Division (Idling) IGT
0 V
IGF
0 V2 V/
Division
A09287BE6653A09268
START
IGT2
IGT1
(±) (+)
BE6653A01761A01861
ON
START
1 (±) (+)
± DIAGNOSTICSENGINE
DI±105
Reference: INSPECTION USING OSCILLOSCOPE
During idling, check the waveform between terminals IGT1 and
E1, IGT2 and E1, and IGF and E1 of the ECM connector.
HINT:
The correct waveforms are as shown.
NG Check and replace ECM (See page IN±29).
NG
6 Disconnect ignition coil with igniter connector, and check voltage between ter-
minals IGT1, IGT2 of ECM connector and body ground.
PREPARATION:
(a) Disconnect the ignition coil with igniter connector.
(b) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
CHECK:
Measure the voltage between terminals IGT1, IGT2 of the ECM
connector and body ground when the engine is cranked.
OK:
Voltage: More than 0.1 V and less than 5 V
OK Replace ignition coil with igniter.
NG
7 Check ignition coil with igniter power source circuit.
PREPARATION:
Disconnect the ignition coil with igniter connector.
CHECK:
Measure the 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±106
± DIAGNOSTICSENGINE
8 Check for open and short in harness and connector between ignition switch and
ignition coil with igniter (See page IN±29).
NG Repair or replace harness or connector.
OK
Replace ignition coil with igniter.

± DIAGNOSTICSENGINE
DI±107
DTC P1335 Crankshaft Position Sensor Circuit Malfunc-
tion (During engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 on page DI±59.
DTC No.DTC Detecting ConditionTrouble Area
P1335
If conditions (a) through (c) are met:
(a) NE
1,000 rpm
(b) NE signal is not detected for over 50 msec.
(c) Not during cranking
Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Crankshaft timing pulley

ECM
WIRING DIAGRAM
Refer to DTC P0335 on page DI±59.
INSPECTION PROCEDURE
Refer to DTC P0335 on page DI±59.
DI1K1±03

A09400
ECM
STP 4
E4
G±W G±WJ23 J24 1R 1R
1SJ27 J/C
AC Instrument Panel J/B
5
2 4
7
12
G±WLight
Failure
Sensor
Stop
Light
(LH) Stop
Light
(RH) G±R
2
52
5
W±B
W±B
BM High
Mount
Stop
Light
2
1R
A
A
J34
J/C
BL
1
W±B
Stop Light
Switch
2
BatteryW±B W
1C 7
STOP
41BInstrument
Panel J/B
B±R
B±R
F14
2 F14
1
ALT
F9MAIN
FL
FL Block
G±W
1
B±G
DI±108
± DIAGNOSTICSENGINE
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut±off engine speed.
(The fuel cut±off engine speed is reduced slightly when the vehicle is braking.)
DTC No.DTC Detecting ConditionTrouble Area
P1520Stop light switch does not turn off even once vehicle is driven
(2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
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 was warmed up or not, the air±fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check operation of stop light.
PREPARATION:
Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit
(See Pub. No. RM654U, page BE±37).
DI01H±09

A09282
BE6653Q06993A09270
Brake Pedal
Depressed ON
Brake Pedal
Released
STP
(±) (+)
± DIAGNOSTICSENGINE
DI±109
OK
2 Check STP signal.
When using TOYOTA hand±held tester:
PREPARATION:
(a) Connect the TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand±
held tester main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand±held tester.
OK:
Brake PedalSTP Signal
DepressedON
ReleasedOFF
When not using TOYOTA hand±held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the voltage between terminal STP of the ECM connector
and body ground.
OK:
Brake PedalVoltage
Depressed7.5 ± 14 V
ReleasedBelow 1.5 V
OK Check for intermittent problems
(See page DI±3).
NG
3 Check harness and connector between ECM and stop light switch
(See page IN±29).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN±29).