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DI-159
DIAGNOSTICS - AUTOMATIC TRANSMISSION
DI8WD-02
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
S When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle an OBD II scan
tool complying with SAE J1987 or hand-held tester,
and read off various data output from the vehicle's
FI0534
ECM.
OBD II regulations require that the vehicle's on-
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle
emissions. In addition to the MIL lighting up when
a malfunction is detected, the applicable DTCs pre-
scribed by SAE J2012 are recorded in the ECM
memory (See page DI-13 ).
If the malfunction only occurs in 3 trips, the MIL goes
off but the DTCs remain recorded in the ECM
memory.
Hand-held Tester S To check the DTCs, connect an OBD II scan tool or
hand-held tester to DLC3 on the vehicle. The OBD
II scan tool or hand-held tester also enables you to
erase the DTCs and check freeze frame data and
various forms of engine data (For instruction book).
DTCs include SAE controlled codes and Manufac-
turer controlled codes.
SAE controlled codes must be set as prescribed by
DLC3 the SAE, while Manufacturer controlled codes can
A00026
be set freely by the manufacturer within the pre-
scribed limits (See DTC chart on page DI-171 ).
2002 4RUNNER (RM887U)
Author : Date : 335
DI-160
DIAGNOSTICS - AUTOMATIC TRANSMISSION
S 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 and for a malfunction that is only detected
once or momentarily.
(hand-held tester) (See page DI-159 )
S *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
2nd test drive, this 2nd detection causes the MIL to
light up.
(b) Inspect the DLC3.
The vehicle's ECM uses the V.P.W. (Variable Pulse Width)
for communication to comply with SAE J1850. The termi-
nal arrangement of DLC3 complies with SAE J1962 and
matches the V.P.W. format.
N09214
Terminal No. Connection / Voltage or Resistance Condition
2 Bus (+) Line / Pulse generation During communication
4 Chassis Ground Body / 1 or less Always
5 Signal Ground Body / 1 or less Always
16 Battery Positive Body / 9 14 V Always
HINT:
If your display shows "UNABLE TO CONNECT TO VEHICLE"
when you have connected the cable of OBD II scan tool or
hand-held tester to DLC3, turned the ignition switch ON and
operated the scan tool, there is a problem on the vehicle side
or tool side.
S If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.
S If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.
2002 4RUNNER (RM887U)
Author : Date : 336
DI-161
DIAGNOSTICS - AUTOMATIC TRANSMISSION
2. INSPECT DIAGNOSIS (NORMAL MODE)
(a) Check the MIL.
(1) The MIL comes on 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 is started, the MIL should go off.
FI0534 If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
hand-held tester only: When the diagnostic system is
switched from normal mode to check mode, it erases all
DTCs and freeze frame data recorded in normal mode. So
before switching modes, always check the DTCs and
freeze frame data, and note them down.
(1) Prepare an OBD II scan tool (complying with SAE
J1978) or hand-held tester.
Hand-held Tester (2) Connect the OBD II scan tool or hand-held tester
to DLC3 at the lower of the instrument panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or hand-held tester switch ON.
(4) Use the OBD II scan tool or hand-held tester to
check the DTCs and freeze frame data and note
them down (For operating instructions, see the
OBD II scan tool's instruction book).
DLC3
A00026 (5) See page DI-159 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding hand-held tester) to check the DTCs, use normal
mode. For codes on the DTCs chart subject to "2 trip detec-
tion logic", turn the ignition switch OFF after the symptoms
have been simulated the 1st time. Then repeat the simula-
tion process again. When the program has DTCs, they are
recorded in the ECM.
3. INSPECT DIAGNOSIS (CHECK MODE)
HINT:
hand-held tester only: Compared to the normal mode, the
check mode has high sensing ability to detect malfunctions.
Furthermore, the same diagnostic items which are detected in
Normal mode can also be detected in Check mode.
(a) Check the DTC.
(1) Check the initial conditions.
S Battery positive voltage 11 V or more.
S Throttle valve fully closed.
S Transmission in P position.
S Air conditioning switched OFF.
2002 4RUNNER (RM887U)
Author : Date : 337
DI-162
DIAGNOSTICS - AUTOMATIC TRANSMISSION
(2) Turn the ignition switch OFF.
(3) Prepare a hand-held tester.
Hand-held Tester (4) Connect the hand-held tester to DLC3 at the lower
portion of the instrument panel.
(5) Turn the ignition switch ON and switch the hand-
held tester ON.
DLC3
A00026
(6) Switch the hand-held tester from Normal mode to
Check mode (Check that the MIL flashes).
0.13 sec. 0.13 sec. (7) Start the engine (MIL goes out after the engine
starts).
ON (8) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
OFF Leave the ignition switch ON until you have checked the
BR3904 DTCs, etc.
(9) After simulating the malfunction conditions, use the
hand-held tester diagnosis selector to check the
DTCs and freeze frame data, etc.
HINT:
Take care not to turn the ignition switch OFF, as turning it off the
diagnosis system switches Check mode to Normal mode, so all
DTCs, etc. are erased.
(10) After checking the DTC, inspect the applicable cir-
cuit.
(b) Clear the DTC.
The following operation will erase the DTC and freeze
frame data. Operating an OBD II scan tool (complying
with SAE J1978) or hand-held tester to erase the codes
(See the OBD II scan tool's instruction book for operating
instructions.).
2002 4RUNNER (RM887U)
Author : Date : 338
DI-163
DIAGNOSTICS - AUTOMATIC TRANSMISSION
4. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 - 80 ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo