1999 TOYOTA CAMRY ignition

BE6653P23721A03008A03407
w/o Immobiliser
w/ ImmobiliserE2 (±)
VC (+)
ON
E2 (±)
VC (+)
± DIAGNOSTICSENGINE (5S±FE)
DI±31
266 Author: Date:
1 Connect OBD II scan tool or TOYOTA hand±held tester, and read value of man-
ifold absolute pressure.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand±held tester main switch
ON.
CHECK:
Read value of the manifold absolute pressure on the OBD II scan tool or TOYOTA hand±held tester.
OK:
Same as atmospheric pressure.
OK Check for intermittent problems
(See page DI±3).
NG
2 Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of the ECM
connector.
OK:
Voltage: 4.5 ± 5.5 V
NG Check and replace ECM (See page IN±31).
OK

BE6653P23722A03009A03408
w/o Immobiliser
w/ ImmobiliserPIM (+)E2 (+)
ON
PIM (+)
E2 (+)
DI±32
± DIAGNOSTICSENGINE (5S±FE)
267 Author: Date:
3 Check voltage between terminals PIM and E2 of ECM connector.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals PIM and E2 of the ECM
connector.
OK:
Voltage: 3.3 ± 3.9 V
OK Check and replace ECM (See page IN±31).
NG
4 Check for open and short in harness and connector between manifold absolute
pressure sensor and ECM.
NG Repair or replace harness or connector.
OK
Replace manifold absolute pressure sensor
(See page SF±52).

A00391
ECM
13
2
9 Intake Air Temp.
Sensor
E85 V
E8THA
E2
E1
ON
± DIAGNOSTICSENGINE (5S±FE)
DI±37
272 Author: Date:
1 Connect OBD II scan tool or TOYOTA hand±held tester, and read value of intake
air temperature.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand±held tester main switch
ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA hand±held tester.
OK:
Same as actual air intake temperature.
HINT:

If there is open circuit, OBD II scan tool or TOYOTA hand±held tester indicates ± 40°C (± 40°F).

If there is short circuit, OBD II scan tool or TOYOTA hand-held tester indicates 140°C (284°F) or more.
NG ±40°C (±40°F) .... Go to step 2.
140°C (284°F) or more .... Go to step 4.
OK
Check for intermittent problems
(See page DI±3).
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the intake air temp. sensor connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA hand±
held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Confirm good connection at sensor. If OK, re-
place intake air temp. sensor.
NG

A03010A03409
Intake Air Temp.
SensorECM
3
9
E8E8THA
E25 V
ON
E1
THAE2
w/o Immobiliser
w/ Immobiliser
THA
E2
DI±38
± DIAGNOSTICSENGINE (5S±FE)
273 Author: Date:
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Connect between terminals THA and E2 of the ECM con-
nector.
HINT:
The intake air temp. sensor connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN±31).
(c) Turn the ignition switch ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA
hand±held tester.
OK:
Temperature value: 140°C (284°F) or more
OK Open in harness between terminals E2 or THA,
repair or replace harness.
NG
Confirm good connection at ECM. If OK,
check and replace ECM (See page IN±31).

A00393
ON
Intake Air Temp.
Sensor
2
1ECM
3
9
THA
E2
E15 V
E8
E8
± DIAGNOSTICSENGINE (5S±FE)
DI±39
274 Author: Date:
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the intake air temp. sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA
hand±held tester.
OK:
Temperature value: ±40°C (±40°F)
OK Replace intake air temp. sensor.
NG

A03011A03410
Intake Air Temp.
SensorECM
THA
E25 V
E1
ON
E8 Connector
w/o Immobiliser
w/ Immobiliser
E8 Connector
DI±40
± DIAGNOSTICSENGINE (5S±FE)
275 Author: Date:
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Disconnect the E8 connector from the ECM.
HINT:
The intake air temp. sensor connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA
hand±held tester.
OK:
Temperature value: ±40°C (±40°F)

OK Repair or replace harness or connector.
NG
Check and replace ECM (See page IN±31).

A00395
ECM ON
Engine Coolant
Temp. Sensor
2
14
9
THW
E25 V
E1 E8
E8
± DIAGNOSTICSENGINE (5S±FE)
DI±43
278 Author: Date:
1 Connect OBD II scan tool or TOYOTA hand±held tester, and read value of
engine coolant temperature.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand±held tester main switch
ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA hand±held tester.
OK:
Same as actual engine coolant temperature
HINT:

If there is open circuit, OBD II scan tool or TOYOTA hand±held tester indicates ±40°C (±40°F).

If there is open circuit, OBD II scan tool or TOYOTA hand-held tester indicates 140°C (284°F) or more.
NG ±40°C (±40°F) ... Go to step 2.
140°C (284°F) or more ... Go to step 4.
OK
Check for intermittent problems
(See page DI±3).
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the engine coolant temp. sensor connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA
hand±held tester.
OK:
Temperature value: 140°C (284°F) or more
OK Confirm good connection at sensor. If OK, re-
place engine coolant temp. sensor.
NG

A03012A03411
ON
4 Engine Coolant
Temp. Sensor
2
1ECM
THWE2
5 V
THW
E1 E8
E8
9E2
w/o Immobiliser
w/ Immobiliser
THW
E2
DI±44
± DIAGNOSTICSENGINE (5S±FE)
279 Author: Date:
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See page SF±64).
(b) Connect between terminals THW and E2 of the ECM con-
nector.
HINT:
The engine coolant temp. sensor connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN±31).
(c) Turn the ignition switch ON.
CHECK:
Read temperature value on the OBD II scan tool or TOYOTA
hand±held tester.
OK:
Temperature value: 140°C (284°F) or more
OK Open in harness between terminals E2 or THW,
repair or replace harness.
NG
Confirm good connection at ECM. If OK,
check and replace ECM (See page IN±31).