1999 TOYOTA CAMRY ignition

DI±80
± DIAGNOSTICSENGINE
(1) Connect the TOYOTA hand±held tester to the DLC3.
(2) Switch the TOYOTA hand±held tester from the normal mode to the check mode (See page
DI±3).
(3) Start the engine and warm it up with all accessory switches OFF.
(4) Drive the vehicle at 60 ± 120 km/h (38 ± 75 mph) and engine speed at 1,600 ± 3,200 rpm for 3
- 5 min.
HINT:
If a malfunction exists, the MIL will light up during step (4).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a TOYOTA hand±held tester, turn the ignition switch OFF after performing steps
(3) and (4), then perform steps (3) and (4) again.
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 Are there any other codes (besides DTC P1130) being output?
YES Go to relevant DTC chart.
NO
2 Connect OBD II scan tool or TOYOTA hand±held tester, and read value for volt-
age output of A/F sensor.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Warm up the A/F sensor with the engine speed at 2,500 rpm for approx. 90 sec.
CHECK:
Read the voltage value of the A/F sensor on the screen of OBD II scan tool or TOYOTA hand±held tester
when you perform all the following conditions.
HINT:
The voltage of the AF+ terminal of the ECM is 3.3 V fixed and the AF± terminal is 3.0 V fixed. Therefore,
it is impossible to check the A/F sensor output voltage at the terminals (AF+/AF±) of the ECM.
OK:
ConditionA/F Sensor Voltage Value
Engine idling
Engine racing
Not remains at 3.30 V (0.660 V*)
Driving at engine speed 1,500 rpm or more and vehicle
speed 40 km/h (25 mph) or more, and operate throttle valve
open and close
Not remains at 3.30 V (0.660 V)

Not remains at 4.5 V (0.76 V*) or more
*: When you use the OBD II scan tool (excluding TOYOTA hand±held tester)

A09280BE6653
A09427
HTAF ON
(±)
(+)
DI±84
± DIAGNOSTICSENGINE
DTC P1135 A/F Sensor Heater Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±40.
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 on page DI±40.
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 voltage between terminal HTAF of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal HTAF of the ECM con-
nector and body ground.
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±29).
NG
2 Check resistance of A/F sensor heater (See Pub. No. RM654U, page SF±59).
NG Replace A/F sensor.
OK
DI01F±07

DI±88
± DIAGNOSTICSENGINE
INSPECTION PROCEDURE
TOYOTA hand±held tester:
1 Check fuel shutoff valve for delivery pipe.
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.
(c) Select the ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operating sound of the fuel shutoff valve for delivery pipe for fuel tank when it is operated by the
TOYOTA hand±held tester.
HINT:
Use a sound scope or your finger to check the operating sound.
OK:
There is operating sound from the shutoff valve.
OK Go to step 9.
2 Check fuel shutoff valve for fuel pressure regulator and fuel shutoff valve for
fuel tank.
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.
(c) Select the ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operating sound of the fuel shutoff valve for fuel pressure regulator and fuel shutoff valve for fuel
tank when it is operated by the TOYOTA hand±held tester.
HINT:
Fuel shutoff valve for fuel pressure regulator:
Use a sound scope or your finger to check the operating sound.
OK:
There is operating sound from the shutoff valve.
NG Fuel shutoff valve for fuel pressure regulator ...
Go to step 7.
NG Fuel shutoff valve for fuel tank ... Go to step 4.
NG

A09277
FC ON
(±) (+)
± DIAGNOSTICSENGINE
DI±89
3 Check circuit opening relay (Marking: CIR OPN) (See Pub. No. RM654U, page
SF±41).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:
(a) Remove the glove compartment.
(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
OK Go to step 5.
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).
5 Check fuel shutoff valve for fuel tank (See page SF±34).
NG Replace.
OK
6 Check for open in harness and connector between circuit opening relay (Mark-
ing: CIR OPN) and fuel shutoff valve for fuel tank, and fuel shutoff valve for fuel
tank and body ground (See page IN±29).
NG Repair or replace harness or connector.

A09424
ON
VCNG2
(±)
(+) E01
A09425
ON
VCNG3
(±)(+) E01
DI±90
± DIAGNOSTICSENGINE
OK
7 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
8 Check fuel shutoff valve for fuel pressure regulator (See page SF±30).
NG Replace fuel shutoff valve with fuel pressure
regulator.
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).
9 Check voltage between terminals VCNG3 and E01 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment.
(b) Start the engine.
CHECK:
Measure the voltage between terminals VCNG3 and E01 of the
ECM connectors.
OK:
Voltage: 9 ± 14 V

A03030A09432
ON
FC
OFFON
± DIAGNOSTICSENGINE
DI±91
OK Check and replace ECM (See page IN±29).
NG
10 Check fuel shutoff valve for delivery pipe (See page SF±28).
NG Replace.
OK
Check for open in harness and connector between EFI main relay (Marking: EFI) and fuel shutoff
valve for delivery pipe, and fuel shutoff valve for delivery pipe and ECM (See page IN±29).
OBD II scan tool (excluding TOYOTA hand±held tester):
1 Check operation of fuel shutoff valve for fuel tank.
PREPARATION:
Remove the glove compartment (See Pub. No. RM654U, page
SF±64).
CHECK:
(a) Connect between terminal FC of the ECM connector and
body ground.
(b) Check for operating sound from the fuel shutoff valve for
fuel tank when the ignition switch turned ON.
OK:
There is operating sound from the fuel shutoff valve.
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI±21).
NG
2 Check for ECM power source circuit (See page DI±116).
NG Repair or replace.
OK

A09424
ON
VCNG2
(±)
(+) E01
A09425
ON
VCNG3
(±)(+) E01
± DIAGNOSTICSENGINE
DI±93
7 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
8 Check fuel shutoff valve for fuel pressure regulator (See page SF±30).
NG Replace fuel shutoff valve with fuel pressure
regulator.
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).
9 Check voltage between terminals VCNG3 and E01 of ECM connectors.
PREPARATION:
(a) Remove the glove compartment.
(b) Start the engine.
CHECK:
Measure the voltage between terminals VCNG3 and E01 of the
ECM connectors.
OK:
Voltage: 9 ± 14 V
OK Check and replace ECM (See page IN±29).

± DIAGNOSTICSENGINE
DI±95
DTC P1240 Fuel Fuel Shutoff Valve Circuit for Delivery
Pipe Malfunction
CIRCUIT DESCRIPTION
Refer to DTC P1190 on page DI±86.
DTC No.DTC Detecting ConditionTrouble Area
P1240Open in fuel shutoff valve circuit for fuel delivery pipe

Open or short in fuel shutoff valve circuit for fuel delivery pipe

Fuel shutoff valve for fuel delivery pipe

ECM
WIRING DIAGRAM
Refer to DTC P1190 on page DI±86.
INSPECTION PROCEDURE
TOYOTA hand±held tester:
1 Check fuel shutoff valve for delivery pipe.
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.
(c) Select the ACTIVE TEST mode on the TOYOTA hand±held tester.
CHECK:
Check the operating sound of the fuel shutoff valve for delivery pipe when it is operated by the TOYOTA
hand±held tester.
HINT:
Use a sound scope or your finger to check the operating sound.
OK:
There is operating sound from the shutoff valve.
OK Go to step 5.
NG
2 Check for ECM power source circuit (See page DI±116).
NG Repair or replace.
DI64Y±01