check engine TOYOTA RAV4 1996 Service Manual PDF

− DIAGNOSTICSENGINE
DI−55
1996 RAV4 (RM447U)
NG Repair or replace.
OK
Check the compression pressure (See page EM−3), valve clearance (See page EM−5) and valve
timing (See page EM−19).

BE6053S02469A07399
LOCK
E5 ConnectorKNK
(+)
− DIAGNOSTICSENGINE
DI−57
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check continuity between terminal KNK of ECM connector and body ground.
PREPARATION:
(a) Remove side trim cover (See page SF−61).
(b) Disconnect the E5 connector of ECM.
CHECK:
Measure resistance between terminal KNK of ECM connector
and body ground.
OK:
Resistance: 1M Ω or higher
OK Go to step 3.
NG
2 Check knock sensor (See page SF−57).
NG Repair knock sensor.
OK
3 Check for open and short in harness and connector between ECM and knock
sensor (See page IN−30).
NG Repair or replace harness or connector.
OK
4 Does malfunction disappear when a good knock sensor is installed?
YES Replace knock sensor.
NO

A00406
0.5 V/
Division
0.5 V/
Division5 m sec./Division Knock signal waveform
0 V
0 V
100 μ sec./Division DI−58
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
Check and replace ECM (See page IN−30).
Reference INSPECTION USING OSCILLOSCOPE
With the engine racing (4,000 rpm) measure between ter-
minal KNK of ECM and body ground.
HINT:
The correct waveform is as shown.
Spread the time on the horizontal axis, and confirm that
period of the wave is 132
sec.
(Normal mode vibration frequency of knock sensor: 7.6
KHz).
HINT:
If normal mode vibration frequency is not 7.6 KHz, the sensor
is malfunctioning.

FI7059FI7060A06620
NENEG
G20 m sec./Division (Idling)
10 m sec./Division (Idling)
5 V/Division
5 V/Division
DI−60
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check resistance of crankshaft position sensor (See page IG−14).
Reference:
INSPECTION USING OSCILLOSCOPE
During cranking or idling, check between terminals G  and NE
, NE  and NE  of ECM.
HINT:
The correct waveforms are as shown.
NG Replace crankshaft position sensor.
OK
2 Check for open and short in harness and connector between ECM and crank-
shaft position sensor (See page IN−30).
NG Repair or replace harness or connector.
OK

− DIAGNOSTICSENGINE
DI−61
1996 RAV4 (RM447U)
3 Inspect sensor installation and teeth of signal plate.
NG Tighten the sensor.
Replace signal plate.
OK
Check and replace ECM (See page IN−30).

DI−62
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0336 Crankshaft Position Sensor Circuit Range /
Performance
CIRCUIT DESCRIPTION
Refer to Crankshaft Position Sensor ”A” Circuit Malfunction on page DI−59.
DTC No.DTC Detecting ConditionTrouble Area
P0336Engine control computer malfunction (for backup)Distributor
ECM
WIRING DIAGRAM
Refer to page DI−59.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0336) being output?
YES Go to relevant DTC chart.
NO
Check and replace ECM
(See page IN−30).
DI3ZR−01

− DIAGNOSTICSENGINE
DI−63
1996 RAV4 (RM447U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
Camshaft position sensor (G signal) consist of a signal plate an pickup coil.
The G signal plate has one tooth on its outer circumference and is built into the distributor.
When the camshaft rotate, the protrusion on the signal plate and the air gap on the pickup coil change, caus-
ing fluctuations in the magnetic field and generating an electromotive force in the pickup coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G signal
and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.Detection ConditionTrouble Area
P0340No camshaft position sensor signal to ECM with engine speed
600 rpm or more
Open or short in camshaft position sensor circuit
Camshaft position sensor
Starter
ECM
WIRING DIAGRAM
Refer to page DI−59 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check resistance of camshaft position sensor (signal generator) (See page
IG−14).
Reference:
INSPECTION USING OSCILLOSCOPE
Refer to page DI−59 for the OSCILLOSCOPE.
NG Replace camshaft position sensor.
OK
2 Check for open and short in harness and connector between ECM and camshaft
position sensor (See page IN−30).
NG Repair or replace harness or connector.
OK
DI3ZS−01

DI−64
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
3 Inspect sensor installation.
NG Tighten the sensor.
OK
Check and replace ECM (See page IN−30).

(7)
(5) (4)(6)
(3)
(2)
(1)
P20769
Vehicle Speed
70 − 90 km/h
(43 − 56 mph)
Idling
IG SW OFF
Warm up
3 − 5 mins2 mins 3 − 5 mins 2 mins Time
DI−66
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
SYSTEM CHECK DRIVING PATTERN
(1) Connect the OBDII scan tool or TOYOTA hand−held tester to the DLC3.
(2) Start and warm it up the engine with all accessories switched OFF.
(3) Run the vehicle at 70 − 90 km/h (43 − 56 mph) for 3 minutes or more.
(4) Idle the engine for about 2 minutes.
(5) Stop at safe place and turn the ignition switch OFF.
(6) Start the engine and do steps (3) and (4) again.
(7) Check the ”READINESS TESTS” mode on the OBDII scan tool or TOYOTA hand−held tester. If ”COMPL”
is displayed and the MIL does not light up, the system is normal. If ”INCMPL” is displayed and the MIL does
not light up, run the vehicle again and check it.
HINT:
”INCMPL” is displayed when either condition (a) or (b) exists.
The system check is incomplete.
There is malfunction in the system.
If there is a malfunction in the system, the MIL will light up after step (2) to (6) above are done.
INSPECTION PROCEDURE
HINT:
If DTC ”P0150” and / or ”P0106” and ”P0401” are output simultaneously, perform troubleshooting or
DTC ”P0105” first.
If DTC ”P0401” and ”P0402” are output simultaneously, perform troubleshooting of DTC ”P0402” first.

A00407
System: (OFF) System: (ON)Air
GGAir
EE
Air Filter
− DIAGNOSTICSENGINE
DI−67
1996 RAV4 (RM447U)
TOYOTA hand−held tester
1 Check the connection of the vacuum hose, EGR hose (See page EC−5).
NG Repair or replace.
OK
2 Check the VSV for EGR.
PREPARATION:
Select the ACTIVE TEST mode on the TOYOTA hand−held tes-
ter.
CHECK:
Check operation of VSV, when it is operated by the TOYOTA
hand−held tester.
OK:
EGR system is OFF:
Air from pipe E is flowing out through the air filter.
EGR system is ON:
Air from pipe E is flowing out pipe G.
OK Go to step 4.
NG
3 Check operation of the VSV for EGR (See page SF−43).
NG Replace VSV for EGR.
OK
Check for open and short in harness and con-
nector between R/B No.6 and ECM
(See page IN−30).