TOYOTA RAV4 1996 Service Repair Manual

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.

A15827
− DIAGNOSTICSENGINE
DI−105
1996 RAV4 (RM447U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−20.
DI965−01

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).

A00422
STA (+)
START
− DIAGNOSTICSENGINE
DI−107
1996 RAV4 (RM447U)
OBDII scan tool (excluding TOYOTA hand−held tester):
1 Check voltage between terminal STA of ECM connector and body ground.
PREPARATION:
(a) Turn up the floor mat on the passenger side.
(b) Remove the 2 bolts for ECM.
CHECK:
Measure the voltage between terminal STA of ECM connector
and the body ground during engine is cranking.
OK:
Voltage: 6.0 V or more.
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
(Marking: ST) (See page IN−30).
NG Repair or replace harness or connector.
OK
Check and replace ECM
(See page IN−30).

S02405
Battery22
2W1
17
16R/B No.2
R−W
IB220
R−W
E6BATTECM
MAIN FLEFI DI−108
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P1600 ECM BATT Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal BATT of the ECM even the ignition switch is OFF for use by
the DTC memory and air−fuel ratio adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuitOpen in back up power source circuit
ECM
HINT:
If DTC P1600 appear, the ECM does not store another DTC.
WIRING DIAGRAM
DI403−01

A00421
LOCK
BATT (+)
S02495
EFI Fuse
R/B No.2
− DIAGNOSTICSENGINE
DI−109
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove side trim cover (See page SF−61).
CHECK:
Measure voltage between terminal BATT of ECM connector
and body ground.
OK:
Voltage: 9 − 14 V
OK Check and replace ECM (See page IN−30).
NG
2 Check EFI fuse.
PREPARATION:
Remove EFI fuse from R/B No.2.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to EFI fuse.
OK
Check and repair harness or connector be-
tween battery and EFI fuse, EFI fuse and
ECM.

DI−11 0
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park / neutral position switch goes on when the shift lever is in the N or P shift position. When it goes
on terminal NSW of the ECM is grounded to body ground via the starter relay thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L or R position, the park / neutral position switch goes off,
so the voltage of ECM terminal NSW becomes battery positive voltage, the voltage of the ECM internal pow-
er source.
If the shift lever is moved from the N position to the D position, this signal is used for air−fuel ratio correction
and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
Two or more switches are ON simultaneously for ”N”, ”2”, ”L”
and ”R” position
(2 trip detection logic)
Short in park / neutral position switch circuit
Park / neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park / neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 80 km/h (50 mph) or more
(b) Engine speed: 1,500 ∼ 3,000 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
DI404−01