1996 TOYOTA RAV4 Harness short

BE277−01
BE−68
− BODY ELECTRICALAUDIO SYSTEM
1996 RAV4 (RM447U)
TROUBLESHOOTING
NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC etc. of the re-
placement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during sys-
tem operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the trouble taking the following items into consideration.
Open or short circuit of the wire harness
Connector or terminal connection fault
ProblemNo.
RadioNo power coming in.1
Power coming in, but radio not operating.2
Noise present, but AM − FM not operating.3
Either speaker does not work.4
Either AM or FM does not work.5
Reception poor (Volume faint).5
Few preset tuning bands.5
Sound quality poor.6
Cannot set station select button.6
Preset memory disappears.7
Tape PlayerCassette tape cannot be inserted.8
Cassette tape inserted, but no power.9
Power coming in, but tape player not operating.10
Either speaker does not work.11
Sound quality poor (Volume faint).12
Tape jammed, malfunction with tape speed or auto−reverse.13
APS, SKIP, RPT buttons not operating.14
Cassette tape will not ejected.15
AntennaAntenna−related.16
NoiseNoise produced by vibration or shock while driving.17
Noise produced when engine starts.18

A00390
ON
PIM
(+)E2
(−)
− DIAGNOSTICSENGINE
DI−23
1996 RAV4 (RM447U)
NG Check and replace ECM (See page IN−30).
OK
3 Check voltage between terminals PIM and E2 of ECM connector.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals PIM and E2 of ECM con-
nector.
OK:
Voltage : 3.3 − 3.9 V
OK Check and replace ECM (See page IN−30).
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.

A00393
Intake Air
Temp. SensorON
2
1
E5E5
3
95V
E2THA
E1 ECM
A00394
Intake Air
Temp. SensorON
5V
E2
THA
E1 ECM
E5
connector
DI−28
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the intake air temp. sensor connector.
(b) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII scan tool or TOYOTA
hand−held tester.
OK:
Temperature value : − 40°C (− 40°F).
OK Replace intake air temp. sensor.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Disconnect the E5 connector of ECM.
HINT:
Intake air temp. sensor connector is disconnected.
(c) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII 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−30).

A00395
Engine Coolant
Temp. Sensor
E5
E2
THW
5V
94ECM
E5E1
1 2
ON
DI−30
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
1 Connect the OBDII scan tool or TOYOTA hand−held tester, and read value of en-
gine coolant temperature.
PREPARATION:
(a) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and OBDII scan tool or TOYOTA hand−held tester main switch ON.
CHECK:
Read temperature value on the OBDII scan tool or TOYOTA hand−held tester.
OK:
Same as actual engine coolant temperature.
HINT:
If there is open circuit, OBDII scan tool or TOYOTA hand−held tester indicates − 40°C (− 40°F).
If there is short circuit, OBDII 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 sensor wire harness terminals together.
(c) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII scan tool or TOYOTA
hand−held tester.
OK:
Temperature value: 140°C (284°F) or more.
OK Confirm good connection at sensor. If OK,
replace engine coolant temp. sensor.
NG

A00396
Engine Coolant
Temp. Sensor
E5E2
THW
5V
94ECM
E5
E1
12
ON
THWE2
A00397
Engine Coolant
Temp. Sensor
E5E2
THW
5V
94ECM
E5
E1
ON
− DIAGNOSTICSENGINE
DI−31
1996 RAV4 (RM447U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove side trim cover. (See page SF−61).
(b) Connect between terminals THW and E2 of ECM connec-
tor.
HINT:
Engine coolant temp. sensor connector is disconnected. Be-
fore checking, do a visual and contact pressure check for the
ECM connector (See page IN−30).
(c) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII 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, replace ECM.
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the engine coolant temp. sensor connector.
(b) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII scan tool or TOYOTA
hand−held tester.
OK:
Temperature value : − 40°C (− 40°F)
OK Replace engine coolant temp. sensor.
NG

A00398
Engine Coolant
Temp. Sensor
E2
THW
5V ECM
E1
ON
E5connector
DI−32
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove side trim cover. (See page SF−61).
(b) Disconnect the E5 connector of ECM.
HINT:
Engine coolant temp. sensor connector is disconnected.
(c) Turn ignition switch ON.
CHECK:
Read temperature value on the OBDII 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−30).

A00389
ON
E2
(−)VC
(+)
− DIAGNOSTICSENGINE
DI−37
1996 RAV4 (RM447U)
NG Check for open and short in harness and con-
nector between ECM and throttle position sen-
sor (VTA or E2 line) (See page IN−30).
OK
Check and replace ECM
(See page IN−30).
5 Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals VC and E2 of ECM con-
nector.
OK:
Voltage 4.5 − 5.5 V
NG Check and replace ECM (See page IN−30).
OK
Check for open in harness and connector
between ECM and sensor (VC line)
(See page IN−30).

− DIAGNOSTICSENGINE
DI−41
1996 RAV4 (RM447U)
2 Check for open and short in harness and connector between ECM and oxygen
sensor (See page IN−30).
NG Repair or replace harness or connector.
OK
Replace oxygen sensor.