check engine TOYOTA RAV4 1996 Service Owners Manual

− DIAGNOSTICSENGINE
DI−93
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
HINT:
If DTC P0441, P0446 or P0450 is output after DTC P0440, first troubleshoot DTC P0441, P0446 or P0450.
If no malfunction is detected, troubleshoot DTC P0440 next.
1 Check voltage between terminals VC and E2 of ECM connector
(See page DI−76, step 9).
NG Check and replace ECM (See page IN−30).
OK
2 Check voltage between terminals PTNK and E2 of ECM connector
(See page DI−76, step 10).
OK Check and replace ECM (See page IN−30).
NG
3 Check for open and short in harness and connector between the vapor pressure
sensor and ECM (See page IN−30).
NG Repair or replace harness or connector.
OK
Replace the vapor pressure sensor.

A04252
C9V−W
E6ECM
SPD5 V
2
9 Combination Meter
− DIAGNOSTICSENGINE
DI−95
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check it the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
NG Check speedometer circuit. See combination
meter troubleshooting.
OK

A00415
SPD
(+)
ON
AT7809
4.5 − 5.5 V
Turn the wheel
0
DI−96
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
2 Check voltage between terminal SPD of ECM connector and body ground.
PREPARATION:
(a) Remove side trim cover (See page SF−62).
(b) Shift the shift lever to neutral.
(c) Jack up one of the front wheels
(d) Turn ignition switch ON.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector be-
tween combination meter and ECM.
OK
Check and replace ECM (See page IN−30).

S02401
6
66 6 5
2 13R/B No.6
From Battery
Fuse Block
1J
1E
B−O11 1
2
From
IG SwitchECM
ISCO
ISCC E4
E4 B−L
B−Y10
9 IAC Valve
EA12
2
B−R B−R
W−B W−B
EA J1
Junction Connector
AA EFI Main Relay R−W
IGNE01
E01
J/B No.13 1
10 B−O
DI−98
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check air induction system (See page EC−5).
NG Repair or replace.
OK
2 Check A/C signal circuit (See page AC−64).
NG Repair or replace.
OK
3 Check voltage between terminals ISCO, ISCC of ECM connector and body
ground.

A00416
ISCO
(+)
E4
ConnectorISCC
(+)ON
− DIAGNOSTICSENGINE
DI−99
1996 RAV4 (RM447U)
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Disconnect the E4 connector of ECM.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminals ISCO, ISCC of ECM con-
nector and body ground.
OK:
Voltage: 9 − 14 V
OK Go to step 5.
NG
4 Check IAC valve (See page SF−34).
NG Replace IAC valve.
OK
Check for open and short in harness and con-
nector between R/B No.6 and IAC valve, IAC
valve and ECM (See page IN−30).
5 Check operation of the IAC valve (See page SF−34).
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN−30).

A00417
IGF
(+)
ON
− DIAGNOSTICSENGINE
DI−101
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check spark plug and spark (See page IG−1).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN−30).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Disconnect igniter connector.
(b) Remove side trim cover (See page SF−61).
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5 − 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN−30).

BE6653P23732A06621
START
IGT
(+)
FI6680
IGT/IGF signal waveform
IGT
0 V
IGF
0 V
10 m sec./Division (Idling)2 V/Division
DI−102
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
4 Check for open and short in harness and connector in IGT signal circuit between
ECM and igniter (See page IN−30).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminal IGT of ECM connector and body ground.
PREPARATION:
Remove side trim cover (See page SF−61).
CHECK:
Measure voltage between terminal IGT of ECM connector and
body ground when 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 terminal IGT and E1 of
ECM.
HINT:
The correct waveforms are as shown.
NG Check and replace ECM (See page IN−30).
OK

BE6653P23732A06621
START
IGT
(+)
BE6653P23909A07402
ON
3 (+) START
− DIAGNOSTICSENGINE
DI−103
1996 RAV4 (RM447U)
6 Disconnect igniter connector and check voltage between terminal IGT of ECM
connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove side trim cover (See page SF−61).
CHECK:
Measure voltage between terminal IGT of ECM connector and
body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
OK Replace igniter.
NG
7 Check voltage between terminal 3 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminal 3 of igniter connector and
body ground, when ignition switch is turned to ”ON” and
”START” position.
OK:
Voltage: 9 − 14 V
NG Check and repair igniter power source circuit.
OK
8 Check for open and short in harness and connector between ignition switch and
ignition coil, ignition coil and igniter (See page IN−30).
NG Repair or replace harness or connector.
OK

DI−104
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
9 Check ignition coil (See page IG−1).
NG Replace ignition coil.
OK
Replace igniter.

DI−106
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI−20).
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN−30).
NG Repair or replace harness or connector.
OK
Check and replace ECM
(See page IN−30).