TOYOTA CAMRY 1999 Service Repair Manual

± DIAGNOSTICSENGINE (5S±FE)
DI±159
394 Author: Date:
4 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
5 Check air induction system (See page SF±1).
NG Repair or replace.
OK
6 Check EGR system (See page EC±12).
NG Repair EGR system.
OK
7 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump, fuel pipe line and
filter (See page SF±1).
OK

DI±160
± DIAGNOSTICSENGINE (5S±FE)
395 Author: Date:
8 Check injector injection (See page SF±23).
NG Replace injector.
OK
Replace A/F sensor.
9 Perform confirmation driving pattern (See page DI±152).
Go
10 Is there DTC P1133 being output again?
YES Check and replace ECM.
NO
11 Did vehicle runs out of fuel in the past?
NO Check for intermittent problems.
YES
DTC P1133 is caused by running out of fuel.

A00430
HTAF (+) ON
± DIAGNOSTICSENGINE (5S±FE)
DI±161
396 Author: Date:
DTC P1135 A/F Sensor Heater Circuit Malfunction
(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±61.
DTC No.DTC Detecting ConditionTrouble Area
P1135
When heater operates, heater current exceeds 8 A
(2 trip detection logic)
Open or short in heater circuit of A/F sensor
A/F h tP1135Heater current of 0.25 A or less when heater operates
(2 trip detection logic)
A/F sensor heater

ECM
WIRING DIAGRAM
Refer to DTC P0125 (Insufficient Coolant Temp. for Closed Loop Fuel Control (Only for California Spec.))
on page DI±61.
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 HTAF of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals HTAF of the ECM connec-
tor and body ground.
OK:
Voltage: 9 ~ 14 V
OK Check and replace ECM (See page IN±31).
NG
DI01F±05

DI±162
± DIAGNOSTICSENGINE (5S±FE)
397 Author: Date:
2 Check resistance of A/F sensor heater (See page SF±59).
NG Replace A/F sensor.
OK
Check and repair harness or connector between EFI main relay (Marking: EFI) and A/F sensor,
and A/F sensor and ECM (See page IN±31).

± 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 (+)
IGT2 (+)
IGT1 (+) w/o Immobiliser
w/ Immobiliser
FI6680
IGT Signal Waveform
10 msec./Division (Idling) IGT
0 V
IGF
0 V2 V/
Division
DI±166
± DIAGNOSTICSENGINE (5S±FE)
401 Author: Date:
5 Check voltage between terminals IGT1, 2 of ECM connector and body ground.
PREPARATION:
Remove the glove compartment (See page SF±64).
CHECK:
Measure voltage between terminal IGT1, 2 of the ECM connec-
tor and body ground when the 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 IGT1, 2 and
E1 of the ECM.
HINT:
The correct waveforms are as shown.
NG Check and replace ECM (See page IN±31).
NG

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.