1999 TOYOTA CAMRY ignition

DI64T±01
A02958
E4ECM Terminals
E6E5E7
11
19
1412 10 9 8
7652
43
18 21 22
20
16151
13
17 11 14
109
87 652 4
3
21 2220
16 15 131
12 11 1 09
652
43 1 12
7 8
19
14
109 8
7652
43
18
23 2416
151
17
11 12 13 25
26 DI±18
± DIAGNOSTICSENGINE
TERMINALS OF ECM
Symbols (Terminals No.)Wiring ColorConditionSTD Voltage (V)
BATT (E4±1) ± E1 (E6±16)B±Y e BRAlways9 ± 14
+B (E4±12) ± E1 (E6±16)B±Y e BRIG switch ON9 ± 14
VC (E5±1) ± E2 (E5±9)Ye BRIG switch ON4.5 ± 5.5
PIM (E5 2) E2 (E5 9)BYBR
IG switch ON3.3 ± 3.9
PIM (E5±2) ± E2 (E5±9)B±Y e BRApply vacuum 26.7 kPa (200 mmHg, 7.9 in.Hg)2.5 ± 3.1
THA (E5±3) ± E2 (E5±9)Y±B e BRIdling, Intake air temp. 20°C (68° F)0.5 ± 3.4
THW (E5±4) ± E2 (E5±9)G±B e BRIdling, Engine coolant temp. 80°C (176°F)0.2 ± 1.0
VTA (E5 11) E2 (E5 9)LGBRIG switch ON, Throttle valve fully closed0.3 ± 1.0VTA (E5±11) ± E2 (E5±9)LG e BRIG switch ON, Throttle valve fully open3.2 ± 4.9
AF+ (E5±6) ± E1 (E6±16)L e BRAlways (IG switch ON)3.3 fixed*
AF± (E5±14) ± E1 (E6±16)B±W e BRAlways (IG switch ON)3.0 fixed*
HT2 (E6 21) E1 (E6 16)PBBRIdlingBelow 3.0HT2 (E6±21) ± E1 (E6±16)P±B e BRIG switch ON9 ± 14
THCNG2 (E7±6) ± E2 (E5±9)P±B e BR
IG switch ON, Fuel temperature ±20°C (4° F)
20°C (68° F)
80°C (176° F)0.66 ± 0.78
2.5 ± 2.75
4.42 ± 4.52
PCNG2 (E7±5) ± E2 (E5±9)G±B e BRIdling ON, Fuel temperature 20°C (68° F)3.1 ± 3.6
STA (E4 11) E1 (E6 16)GRBRCki60STA (E4±11) ± E1 (E6±16)GR e BRCranking6.0 or more
IGT1 (E6±20) ± E1 (E6±16)B e BRIdlingPulse generation
(See page DI±102)
IGT2 (E6±19) ± E1 (E6±16)Y±R e BRIdlingPulse generation
(See page DI±102)
IG switch ON, Disconnect ignition coil connector4.5 ± 5.5
IGF (E6±3) ± E1 (E6±16)W±R e BRIdlingPulse generation
(See page DI±102)
G (E6±5) ± NE± (E6±17)B±W e LIdlingPulse generation
(See page DI±59)
NE (E6±4) ± NE± (E6±17)B±R e LIdlingPulse generation
(See page DI±59)
EGR (E6±23) ± E01(E6±13)P±B e BRIG switch ON0 ± 3
OX2 (E5±5) ± E1 (E6±16)B e BRMaintain engine speed at 2,500 rpm for 2 min. after warming upPulse generation
RSD (E6±10) ± E1 (E6±16)W e BRIG switch ON9 ~ 14
FC (E4±14) ± E01 (E6±13)G±R e BRIG switch ON9 ± 14

A00309
ECM Manifold Absolute
Pressure Sensor
1PIMVC
E2 Y
B±Y
BRE5
E5
E5 3
25 V
E1 1
2
9
± DIAGNOSTICSENGINE
DI±23
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTCs P0105, P0106, P0110, P0115, P0120, P0180 and P0190 are output simultaneously, E2 (sen-
sor ground) may be open.

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 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 the 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

BE6653A03008A09254
E2 VC
ON
(±) (+)
A03009BE6653A09255
PIME2
(±) (+)
DI±24
± DIAGNOSTICSENGINE
2 Check voltage between terminals VC and E2 of ECM connector.
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 VC and E2 of the ECM
connector.
OK:
Voltage: 4.5 ± 5.5 V
NG Check and replace ECM (See page IN±29).
OK
3 Check voltage between terminals PIM and E2 of ECM connector.
PREPARATION:
(a) Remove the glove compartment.
(b) Turn the ignition switch ON.
CHECK:
Measure the 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±29).
NG
4 Check for open and short in harness and connector between manifold absolute
pressure sensor and ECM (See page IN±29).
NG Repair or replace harness or connector.
OK
Replace manifold absolute pressure sensor
(See Pub. No. RM654U, page SF±52).

A00310
Intake Air Temp. Sensor
E5
E53
9ECM
5 V
THA
E2
E1 R
Y±B
BR 2
1
± DIAGNOSTICSENGINE
DI±27
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTCs P0105, P0106, P0110, P0115, P0120, P0180 and P0190 are output simultaneously, E2 (sen-
sor ground) may be open.

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 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 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 the 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).

A00391
ECM
13
2
9 Intake Air Temp.
Sensor
E55 V
E5THA
E2
E1
ON
A03010A09256
Intake Air Temp.
SensorECM
3
9
E5 E5THA
E25 V
ON
E1
THAE2
DI±28
± DIAGNOSTICSENGINE
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the intake air temperature sensor connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand±held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Confirm good connection at sensor. If OK, re-
place intake air temperature sensor.
NG
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Connect between terminals THA and E2 of the ECM con-
nector.
HINT:
The intake air temperature sensor connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN±29).
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA 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±29).

A00393
ON
Intake Air Temp.
Sensor
2
1ECM
3
9
THA
E2
E15 V
E5
E5
A03011A09257
Intake Air Temp.
SensorECM
THA
E25 V
E1
ON
E5 Connector
± DIAGNOSTICSENGINE
DI±29
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the intake air temperature sensor connector.
(b) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand±held tester.
OK:
Temperature value: ±40°C (±40°F)
OK Replace intake air temperature sensor.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Disconnect the E5 connector from the ECM.
HINT:
The intake air temperature sensor connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA 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±29).

A00395
ECM ON
Engine Coolant
Temp. Sensor
2
14
9
THW
E25 V
E1 E5
E5
± DIAGNOSTICSENGINE
DI±31
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 the 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 temperature sensor con-
nector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand±held tester.
OK:
Temperature value: 140°C (284°F) or more
OK Confirm good connection at sensor. If OK, re-
place engine coolant temperature sensor.
NG

A03012A09258
ON
Engine Coolant
Temp. SensorECM
THW
E2
4
2
15 V
THW
E1 E5
E5
9E2
A00397
ON
Engine Coolant
Temp. Sensor
4
9ECM
E5
E5THW
E25 V
E1
DI±32
± DIAGNOSTICSENGINE
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the glove compartment (See Pub. No. RM654U,
page SF±64).
(b) Connect between terminals THW and E2 of the ECM con-
nector.
HINT:
The engine coolant temperature sensor connector is discon-
nected. Before checking, do a visual and contact pressure
check for the ECM connector (See page IN±29).
(c) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA 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±29).
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the engine coolant temperature sensor con-
nector.
(b) Turn the ignition switch ON.
CHECK:
Read the temperature value on the OBD II scan tool or TOYO-
TA hand±held tester.
OK:
Temperature value: ± 40°C (± 40°F)
OK Replace engine coolant temperature sensor.
NG