check engine light TOYOTA RAV4 1996 Service User Guide

DI3Z8−02
DI−14
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below, for details of each code, turn to the page referred to under the ”See page” for the respec-
tive ”DTC No.” in the DTC chart.
SAE DEFINED
DTC No.
(See Page)Detection ItemTrouble AreaMILMemory
P0105
(DI−21)
Manifold Absolute
Pressure / Barometric
Pressure Circuit
MalfunctionOpen or short in Manifold absolute pressure sensor circuit
Manifold absolute pressure sensor
ECM
 *1
P0106
(DI−24)
Manifold Absolute
Pressure / Barometric
Pressure Circuit
Ranger / Performance
Problem
Manifold absolute pressure sensor *1
P0110
(DI−25)Intake Air Temp. Circuit
MalfunctionOpen or short in take air temp. sensor circuit
Intake air temp. sensor
ECM
 *1
P0115
(DI−29)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
 *1
P0116
(DI−33)Engine Coolant Temp. Circuit
Range / Performance ProblemEngine coolant temp. sensor
Cooling system *1
P0120
(DI−34)Throttle / Pedal Position
Sensor / Switch ”A” Circuit
MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM
 *1
P0121
(DI−38)Throttle / Pedal Position
Sensor / Switch ”A” Circuit
Range / Performance Problem
Throttle position sensor *1
P0125
(DI−39)Insufficient Coolant Temp. for
Closed Loop Fuel ControlOpen or short in oxygen sensor circuit
Oxygen sensor *1
P0130
(DI−42)Oxygen Sensor Circuit Malfunc-
tion
(Bank 1 Sensor 1)Oxygen sensor
Fuel trim malfunction *1
P0133
(DI−45)Oxygen Sensor Circuit Slow
Response
(Bank 1 Sensor 1)
Oxygen sensor *1
P0136
(DI−46)Oxygen Sensor Circuit
Malfunction
(Bank 1 Sensor 2)
Oxygen sensor *1
P0171
(DI−48)System too Lean
(Fuel Trim)
Air Intake (hose loose)
Fuel line pressure
Injector blockage
Oxygen sensor malfunction
Manifold absolute pressure sensor
Engine coolant temp. sensor
 *1
*1: MIL lights up

A01666
Vehicle speed
50 − 65 km/h
(31 − 40 mph)
Idling
IG SW OFF
1 − 3 min.
1 min.
Time (1)(2)(4)
(5) (3) DI−42
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0130 Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to ”Insufficient Coolant Temp. for Closed Loop Fuel Control” on page DI−39.
DTC No.DTC Detecting ConditionTrouble Area
P0130
Voltage output of oxygen sensor remains at 0.35 V or more,
0.55 V or less, during idling after the engine is warmed up
(2 trip detection logic)Oxygen sensor
Fuel trim malfunction
HINT:
Sensor 1 refers to the sensor closer to the engine body.
The oxygen sensor’s output voltage and the short−term fuel trim value can be read using the OBDII scan
tool or TOYOTA hand−held tester.
WIRING DIAGRAM
Refer to page DI−39 for the WIRING DIAGRAM.
CONFIRMATION DRIVING PATTEN
(1) Connect the TOYOTA hand−held tester to the DLC3.
(2) Switch the TOYOTA hand−held tester from normal mode to check mode (See page DI−3).
(3) Start the engine and warm it up with all accessory switches OFF.
(4) Drive the vehicle at 50 − 65 km/h (31 − 40 mph) for 1 − 3 minutes to warm up the oxygen sensor.
(5) Idle the engine for 1 minute.
HINT:
If a malfunction exists, the MIL will light up during step (5).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not hove a TOYOTA hand−held tester, turn the ignition switch OFF after performing steps
(3) to (5), then perform steps (3) to (5) again.
DI3ZK−01

DI−48
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
DTC P0171 System too Lean (Fuel Trim)
DTC P0172 System too Rich (Fuel Trim)
CIRCUIT DESCRIPTION
”Fuel trim” refers to the feedback compensation value compared against the basic injection time. Fuel trim
includes short−term fuel trim and long−term fuel trim.
”Short−term fuel trim” is the short−term fuel compensation used to maintain the air−fuel ration at its ideal
theoretical value. The signal from the oxygen sensor indicates whether the air−fuel ratio is RICH or LEAN
compared to the ideal theoretical value, triggering a reduction in fuel volume if the air−fuel ratio is rich, and
an increase in fuel volume if it is lean.
”Long−term fuel trim” is overall fuel compensation carried out long−term to compensate for continual devi-
ation of the short−term fuel trim from the central value due to individual engine differences, wear over time
and changes in the usage environment.
If both the short−term fuel trim and long−term fuel trim are LEAN or RICH beyond a certain value, it is de-
tected as a malfunction and the MIL lights up.
DTC No.DTC Detecting ConditionTrouble Area
P0171
When the air fuel ratio feedback is stable after engine warning
up, the fuel trim is considerably in error on the RICH side
(2 trip detection logic)
Fuel line pressure
Injector blockage
Oxygen sensor malfunction
Manifold absolute pressure sensor
Engine coolant temp. sensor
P0172
When the air fuel ratio feedback is stable after engine warning
up, the fuel trim is considerably in error on the LEAN side
(2 trip detection logic)
Fuel line pressure
Injector blockage, leak
Oxygen sensor malfunction
Manifold absolute pressure sensor
Engine coolant temp. sensor.
HINT:
When DTC P0171 is recorded, the actual air−fuel ratio is on the LEAN side. When DTC P0172 is re-
corded, the actual air−fuel ratio is on the RICH side.
If the vehicle runs out of fuel, the air−fuel ratio is LEAN and DTC P0171 is detected. The MIL then
comes on.
If the total of the short−term fuel trim value and long−term fuel trim value is within ±25 %, the system
is functioning normally.
INSPECTION PROCEDURE
1 Check air induction system (See page SF−1).
NG Repair or replace.
OK
DI3ZN−01

(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.

(4) (3)
(2)
(1)
FI7132
2500 − 3000 rpm Engine Speed
Warmed up 3 minutes IG SW OFFIdling
Time
Check
FI6514
OX Signal Waveform (Oscilloscope)
200 msec./Division 1.0 V
0 V DI−74
− DIAGNOSTICSENGINE
1996 RAV4 (RM447U)
CONFIRMATION ENGINE RACING PATTERN
(1) Connect the TOYOTA hand−held tester to the DLC3, or connect the probe of the oscilloscope between
terminals OX1, OX2 and E1 of ECM.
(2) Start engine and warm it up with all accessories switched OFF until water temperature is stable.
(3) Race the engine at 2500 − 3000 rpm for about 3 min.
(4) After confirming that the waveforms of the oxygen sensor, bank 1 sensor 1 (OX1), oscillate around 0.5
V during feedback to the ECM, check the waveform of the oxygen senor, bank 1 sensor 2 (OX2).
HINT:
If there is a malfunction in the system, the waveform of the oxy-
gen senor, bank1 sensor 2 (OX2), is almost the same as that
of the oxygen sensors, bank 1 senor 1 (OX1), on the left.
There are some cases where, even though a malfunction ex-
ists, the MIL may either light up or not light up.

Q08848
DI−128
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A241E)
1996 RAV4 (RM447U)
The diagnosis system operates in normal mode
during normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic (*) to prevent erroneous detec-
tion. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL
to light up for a malfunction that is only detected
once or momentarily (TOYOTA hand−held tester)
(See page DI−127).
*2 trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the second test
drive, this second detection causes the MIL to light up.
2. Normal Mode:
INSPECT DIAGNOSIS
(a) Check the MIL.
(1) The MIL lights up when the ignition switch is turned
ON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page BE−2).
(2) When the engine starts, the MIL should go off. If the
lamp remains on, the diagnosis system has de-
tected a malfunction or abnormality in the system.
(b) Check the DTC.
NOTICE:
TOYOTA hand−held tester only:
When the diagnostic system is switched from the normal
mode to the check mode, it erases all DTCs and freezed
frame data recorded in the normal mode. So before switch-
ing modes, always check the DTCs and freezed frame data,
and note them down.
(1) Prepare the OBD II scan tool (complying with SAE
J1978) or TOYOTA hand−held tester.
(2) Connect the OBD II scan tool or TOYOTA hand−
held tester to the DLC3.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand−held tester switch ON.
(4) Use the OBD II scan tool or TOYOTA hand−held
tester to check the DTCs and freezed frame data.
Note them down (For operating instructions, see
the OBDII scan tool’s instruction book.).

FI3605
013 sec. ON
OFF
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A241E)
DI−129
1996 RAV4 (RM447U)
(5) See page DI−138 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand−held tester) to check the DTCs, use
the normal mode. For codes on the DTC chart subject to ”2
trip detection logic”, turn the ignition switch off after the
symptoms have been simulated for the first time. Then re-
peat the simulation process again. When the program has
been simulated twice, the MIL lights up and the DTCs are
recorded in the ECM.
3. Check Mode:
INSPECT DIAGNOSIS
HINT:
TOYOTA hand−held tester only:
Compared to the normal mode, the check mode has high sens-
ing ability to detect malfunctions.
Furthermore, the same diagnostic items which are detected in
the normal mode can also be detected in the check mode.
(a) Check the DTC.
(1) Initial conditions.
Battery positive voltage 11 V or more
Throttle valve fully closed
Transaxle in the PARK position
Air conditioning switched off
(2) Prepare the TOYOTA hand−held tester.
(3) Connect the TOYOTA hand−held tester to the
DLC3.
(4) Turn the ignition switch ON and switch the TOYOTA
hand−held tester ON.
(5) Switch the TOYOTA hand−held tester from the nor-
mal mode to the check mode (Check that the MIL
flashes.).
(6) Start the engine (The MIL goes off after the engine
start.).
(7) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTCs, etc.
(8) After simulating the malfunction conditions, use the
TOYOTA hand−held tester diagnosis selector to
check the DTCs and freezed frame data, etc.
HINT:
Take care not to turn the ignition switch OFF.
Turning the ignition switch off switches the diagnosis system
from check mode to normal mode, so all DTCs, etc. are erased.
(9) After checking the DTC, inspect the applicable cir-
cuit.

− DIAGNOSTICSAUTOMATIC TRANSAXLE (A241E)
DI−131
1996 RAV4 (RM447U)
4. CHECK FOR INTERMITTENT PROBLEMS
TOYOTA hand−held tester only:
By putting the vehicle’s ECM in check mode, 1 trip detection logic is possible instead of 2 trip detection logic
and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
(1) Clear the DTCs (See step 3).
(2) Set the check mode (See step 3).
(3) Do simulation test (See page IN−20).
(4) Check the connector connection and terminal (See page IN−30).
(5) Visual check and contact pressure (See page IN−20).
(6) Handle the connector (See page IN−20).
5. PROBLEM SYMPTOM CONFIRMATION
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of the
trouble. If the problem is that the transaxle does not up−shift, down−shift, or the shift point is too high or too
low, conduct the following road test to confirm the automatic shift schedule and simulate the problem symp-
toms.
6. ROAD TEST
NOTICE:
Do the test at normal operating ATF temperature 50 − 80°C (122 − 176°F).
(a) D position test.
Shift into the D position, keep the accelerator pedal constant at the full throttle valve opening position
and check the following points:
(1) Check up− shift operation.
Check that 1 → 2, 2 → 3 and 3 → O/D up−shift takes place, at the shift point shown in the automat-
ic shift schedule (See page SS−32).
HINT:
O/D Gear Up−shift Prohibition Control:
Engine coolant temperature is 50°C (122°F) or less.
If there is a 10km/h (6 mph) difference between the set cruise control speed and vehicle speed.
O/D main switch is pushed ON (During the O/D OFF indicator light lights up.).
O/D Gear Lock−up Prohibition Control:
Brake pedal is depressed.
Engine coolant temperature is 50°C (122°F) or less.
(2) Check for shift shock and slip.
Check for shock and slip at the 1 → 2, 2 → 3 and 3 → O/D up−shifts.
(3) Check for abnormal noise and vibration.
Run at the D position lock−up or O/D gear and check for abnormal noise and vibration.
HINT:
The check for the cause of abnormal noise and vibration must be performed very thoroughly as it could also
be due to loss of balance in the torque converter clutch, etc.
(4) Check kick−down operation.
While running in the D position, 2nd, 3rd and O/D gears, check that the possible kick−down ve-
hicle speed limits for 2 → 1, 3 → 2 and O/D → 3 kick−downs conform to those indicated on the
automatic shift schedule (See page SS−32).
(5) Check abnormal shock and slip at kick−down.
(6) Check the lock−up mechanism.
Drive in the D position, O/D gear, at a steady speed (lock−up ON) of about 75 km/h (47
mph).
Lightly depress the accelerator pedal and check that the RPM does not change abruptly.
If there is a big jump in RPM, there is no lock−up.

Q08832
Q08831N
RP
Q07907
Neutral
Basic
Line
Groove
DI−134
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A241E)
1996 RAV4 (RM447U)
(f) Inspect and adjust shift lever position.
When shifting the shift lever from the N position to other
positions, check that the lever can be shifted smoothly
and accurately to each position and that the position indi-
cator correctly indicates the position.
If the indicator is not aligned with the correct position, carry out
the following adjustment procedures:
(1) Loosen the nut on the control shaft lever.
(2) Push the control shaft lever fully downward.
(3) Return the control shaft lever 2 notches to the N
position.
(4) Set the shift lever to the N position.
(5) While holding the shift lever lightly toward the R
position side, tighten the shift lever nut.
Torque: 6.9 N·m (70 kgf·cm, 61 in·lbf)
(6) Start the engine and make sure that the vehicle
moves forward when shifting the lever from the N to
D position and reverses when shifting it to the R
position.
(g) Inspect and adjust park/neutral position switch.
Check that the engine can be started with the shift lever
only in the N or P position, but not in other positions.
If not as stated above, carry out the following adjustment proce-
dure:
(1) Loosen the park/neutral position switch bolt and set
the shift lever to the N position.
(2) Align the groove and neutral basic line.
(3) Hold in position and tighten the bolt.
Torque: 5.4 N·m (55 kgf·cm, 48 in·lbf)
HINT:
For continuity inspection of the park/neutral position switch, see
page DI−156.
(h) Inspect the idle speed.
Idle speed: 700 ± 50 rpm (In N position and A/C OFF)
8. MECHANICAL SYSTEM TESTS
(a) Measure the stall test
The object of this test is to check the overall performance of the transaxle and engine by measuring
the stall speeds in the D and R positions.
NOTICE:
Do the test at normal operation ATF temperature 50 − 80°C (122 − 176°F).
Do not continuously run this test longer than 5 seconds.
To ensure safety, conduct this test in a wide, clear, level area which provides good traction.
The stall test should be always carried out in pairs. One technician should observe the condi-
tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
(1) Chock the 4 wheels.
(2) Fully apply the parking brake.
(3) Connect OBD II scan tool or TOYOTA hand−held tester to the DLC3.

DI40F−02
− DIAGNOSTICSAUTOMATIC TRANSAXLE (A241E)
DI−141
1996 RAV4 (RM447U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the
circuits for each symptom in the order given in the charts on the following pages and proceed to the page
given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On−Vehicle repair Matrix Chart
Chapter 3: Off−Vehicle repair Matrix Chart
When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to chapter 2
or 3, proceed as instructed.
(1) If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow
chart for each circuit, proceed to the circuit with the next highest number in the table to continue
the check.
(2) If the trouble still occurs even though there are no abnormalities in any of the other circuits, then
check and replace the ECM.
Chapter 1: Electronic Circuit Matrix Chart
SymptomSuspect AreaSee page
No up−shift (A particular gear, from 1st to 3rd gear, is not up−
shifted)7. ECMDI−140
No up−shift (3rd → O/D)
1. O/D main switch & O/D OFF indicator light circuit
2. O/D cancel signal circuit
3. ECMDI−161
DI−166
DI−140
No down−shift (O/D → 3rd)
1. O/D main switch & O/D OFF indicator light circuit
2. O/D cancel signal circuit
3. ECMDI−161
DI−166
DI−140
No down−shift (A particular gear, from 1st to 3rd gear, is not
down−shifted)1. ECMDI−140
No lock−up1. Stop light switch circuit
2. ECMDI−159
DI−140
No lock−up off1. Pattern select switch circuit
2. ECMDI−168
DI−140
Shift point too high or too low1. ECMDI−140
Up−shift to O/D from 3rd while O/D main switch is OFF1. O/D main switch & O/D OFF indicator light circuit
2. ECMDI−161
DI−140
Up−shift to O/D from 3rd while engine is cold1. ECMDI−140
No kick−down1. ECMDI−140
Engine stalls when starting off or stopping1. ECMDI−140
Chapter 2: On−Vehicle Repair
(: A241E, A244E, A245E, A246E Automatic Transaxle Repair Manual Pub. No. RM390U)
SymptomSuspect AreaSee page
Does not move in any forward position1. Off−vehicle matrix chart−
Does not move in reverse position1. Off−vehicle matrix chart−
Does not move in any position
1. Primary regulator valve
2. Manual valve
3. Throttle valve
4. Off−vehicle matrix chart


−
No up−shift (1st → 2nd)1. 1−2 shift valve
2. Off−vehicle matrix chart
−