TOYOTA CAMRY 1999 Service Repair Manual

A02509
HAFL (+)
HAFR (+)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±349
584 Author: Date:
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Bank 1 Sensor 1) (Only for California Spec.)
DTC P1155 A/F Sensor Heater Circuit Malfunction
(Bank 2 Sensor 1) (Only for California Spec.)
CIRCUIT DESCRIPTION
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±249.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When heater operates, heater current exceeds 8 A
(2 trip detection logic)
Open or in heater circuit of A/F sensors
(bank 1, 2 sensor 1)P1135
P1155Heater current of 0.25 A or less when heater operates
(2 trip detection logic)
(bank 1, 2 sensor 1)

A/F sensors (bank 1, 2 sensor 1) heater

ECM
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±249.
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 warmed up or not, the air±fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Check voltage between terminal HAFR, HAFL of ECM connector and body
ground.
PREPARATION:
(a) Remove glove compartment (See page SF±73).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HAFR, HAFL of the ECM
connector and body ground.
OK:
Voltage: 9 ~ 14 V
OK Check and replace ECM (See page IN±31).
NG
DI1K8±04

DI±350
± DIAGNOSTICSENGINE (1MZ±FE)
585 Author: Date:
2 Check resistance of A/F sensor heaters (bank 1, 2 sensor 1) (See page SF±68).
NG Replace A/F sensors (bank 1, 2 sensor 1).
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and A/F sensors
(bank 1, 2 sensor 1), and A/F sensors (bank 1, 2 sensor 1) and ECM (See page IN±31).

S00251
From BatteryIgnition Coil
Spark Plug
IGC1
IGC2
IGC3
GND TA C IGT1
IGT2
IGT3
IGF
To Tachometer ECM G
NE
Camshaft
Position
Sensor
Crankshaft
Position
Sensor
Various
SensorNo.2 Cylinder
No.1 Cylinder
No.4 Cylinder
No.3 Cylinder
No.6 Cylinder
No.5 Cylinder
± DIAGNOSTICSENGINE (1MZ±FE)
DI±351
586 Author: Date:
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
A DIS (Direct Ignition System) has been adopted. The DIS improves the ignition timing accuracy, reduces
high±voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 2±cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with one igni-
tion coil. In the 2±cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end
of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark
plugs. The sparks of the 2 spark plugs pass simultaneously from the center electrode to the ground elec-
trode.
The ECM determines ignition timing and outputs the ignition signals (IGT) for each cylinder. Based on IGT
signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time, the igniter
also sends an ignition confirmation signal (IGF) as a fail±safe measure to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300
Condition (a) is repeated 3 times consecutively during 6
consecutively IGT signals while engine is running
(a) IGF signal is not input to ECM for 2 or more ignitions
Open or short in IGF or IGT circuit from igniter to ECM

Igniter

ECM
DI084±06

S05723
J18
Junction
Connector
A
A A A AII3B±R
B±R B±R W±R128 3
1K 1C
Ignition
Switch
76
1K
1BB±R
G
B±R
B±R Y
LIgnition Coil
Spark Plug
No.1
No.2
No.3
11
12
2
2
ED
BR
3 2 1
10
9
7
6
5
4
W±R LG±B
BR±Y
IgniterECM
IGT1
IGT2
IGT3
IGF5 VInstrument
Panel J/B
E1125
E1113
E1112
E1111GR
B±R
5
5
W±R
Engine Room J/B
2L4
AM2
2A1
B
Fusible
Link
Block 1
1
F6
B±GFL
MAIN
Battery
F4
Instrument
Panel J/B
DI±352
± DIAGNOSTICSENGINE (1MZ±FE)
587 Author: Date:
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 warmed up or not, the air±fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Check spark plug and spark of misfiring cylinder (See page DI±276).
NG Go to step 4.
OK

A02033
ON
IGF (+)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±353
588 Author: Date:
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN±31).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the glove compartment (See page SF±73).
(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 igniter.
NG
Check and replace ECM (See page IN±31).
4 Check for open and short in harness and connector in IGT 1 ~ 3 signal circuits
between ECM and igniter (See page IN±31).
NG Repair or replace harness or connector.
OK

A02034
START
IGT3 IGT2 IGT1(+) (+) (+)
P20870
IGT1 ~ IGT3 and IGF Signal Waveform
VOLT
5
0
5
0
5
0
5
0IGT1
IGT2
IGT3
IGF
20 msec./Division (Idling)
A02034
START
IGT 3 IGT2 IGT1(+) (+) (+)
DI±354
± DIAGNOSTICSENGINE (1MZ±FE)
589 Author: Date:
5 Check voltage between terminals IGT 1 ~ 3 of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page SF±73).
CHECK:
Measure voltage between terminals IGT 1 ~ 3 of the ECM con-
nector and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference INSPECTION USING OSCILLOSCOPE
During idling, check waveform between terminals IGT 1 ~ 3,
IGF and E1 of ECM.
HINT:
The correct waveforms are as shown.
NG Check and replace ECM (See page IN±31).
OK
6 Disconnect igniter connector and check voltage between terminals IGT 1 ~ 3 of
ECM connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the glove compartment (See page SF±73).
CHECK:
Measure voltage between terminals IGT 1 ~ 3 of the ECM con-
nector and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN±31).
OK

BE6653
P24329A00124
ON START
9 (+)
± DIAGNOSTICSENGINE (1MZ±FE)
DI±355
590 Author: Date:
7 Check voltage between terminal 9 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminal 9 of igniter connector and
body ground when ignition switch is turned to ºONº and
ºSTARTº position.
OK:
Voltage: 9 ~ 14 V
NG Check and repair igniter power source circuit
(See page IG±1).
OK
8 Check for open and short in harness and connector between ignition switch and
ignition coil, and ignition coil and igniter (See page IN±31).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG±1).
NG Replace ignition coil.
OK

DI±356
± DIAGNOSTICSENGINE (1MZ±FE)
591 Author: Date:
10 Check EFI main relay (Marking: EFI) (See page SF±53).
NG Replace EFI main relay (Marking: EFI).
OK
Replace igniter.

± DIAGNOSTICSENGINE (1MZ±FE)
DI±357
592 Author: Date:
DTC P1335 Crankshaft Position Sensor Circuit
Malfunction (during engine running)
CIRCUIT DESCRIPTION
Refer to DTC P0335 (Crankshaft Position Sensor ºAº Circuit Malfunction) on page DI±287.
DTC No.DTC Detecting ConditionTrouble Area
P1335No crankshaft position sensor signal to ECM with engine
speed 1,000 rpm or more

Open or short in crankshaft position sensor circuit

Crankshaft position sensor

Starter

ECM
WIRING DIAGRAM
Refer to DTC P0335 (Crankshaft Position Sensor ºAº Circuit Malfunction) on page DI±287.
INSPECTION PROCEDURE
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.
Refer to DTC P0335 (Crankshaft Position Sensor ºAº Circuit Malfunction) on page DI±287.
DI085±06

S06113
Close u Valve Opening " Open 0V 5V
Output Voltage
S05464
EGR Valve Position Sensor
3ECM
1
2Y
W±G
BRVC5V
EGLS
E2 E102
E1122
E1018 DI±358
± DIAGNOSTICSENGINE (1MZ±FE)
593 Author: Date:
DTC P1410 EGR Valve Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The EGR valve position sensor is mounted on the EGR valve
and detects the lift amount of EGR valve. The lift amount of
EGR valve which is detected by the EGR valve position sensor
provides feedback to the ECM to control the lift amount of EGR
valve in response to engine operating conditions.
DTC No.DTC Detecting ConditionTrouble Area
P1410Open or short in EGR valve position sensor circuit
(2 trip detection logic)
Open or short in EGR valve position sensor circuit

EGR valve position sensor

ECM
WIRING DIAGRAM
DI086±06