Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Tundra 2000-2006 Approved 04-06 techinfo.toyota.com ileaf 06toyrm 06toypdf 06rmsrc 06tundra di eg1grfe diasys
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DI-39
DIAGNOSTICS - ENGINE (1GR-FE)
DIDSZ-01
DIAGNOSIS SYSTEM
1. Description
S When troubleshooting On-Board Diagnostic (OBD ll) ve-
hicles, the vehicle must be connected to the hand-held
tester. Various data output from the vehicle's ECM can
then be read.
S OBD ll regulations require that the vehicle's on-board
computer illuminates the Malfunction Indicator Light (MIL)
FI0534
on the instrument panel when the computer detects a
malfunction in: 1) the emission control system/compo-
nents, or 2) the powertrain control components (which af-
fect vehicle emissions), or 3) the computer. In addition,
the applicable Diagnostic Trouble Codes (DTCs) pre-
scribed by SAE J2012 are recorded in the ECM memory
(See page DI-57).
If the malfunction does not reoccur in 3 consecutive trips, the
MIL goes off automatically but the DTCs remain recorded in the
ECM memory.
Hand-Held Tester To check the DTC, connect the hand-held tester or OBD II scan
tool to the Data Link Connector 3 (DLC3) of the vehicle. The
hand-held tester also enables you to erase the DTC and check
the freeze frame data and various forms of engine data (See the
instruction manual for the hand-held tester). The DTC includes
SAE controlled codes and manufacturer controlled codes. SAE
controlled codes must be set according to the SAE, while
manufacturer controlled codes can be set by a manufacturer
DLC3 D13872 with certain restrictions (See the DTC chart on page DI-57).
2. NORMAL MODE AND CHECK MODE
The diagnosis system operates in "normal mode" during normal
vehicle use. In "normal mode", 2 trip detection logic* is used to
ensure accurate detection of malfunctions. A "check mode" is
also available to technicians as an option. In "check mode", 1
trip detection logic is used for simulating malfunction symptoms
and increasing the system's ability to detect malfunctions, in-
cluding intermittent malfunctions (See page DI-11).
3. 2-TRIP DETECTION LOGIC
When a malfunction is first detected, the malfunction is tempo-
rarily stored in the ECM memory. This is known as 1st trip detec-
tion. If the ignition switch is turned OFF and then ON again, and
the same malfunction is detected again, the MIL will illuminate.
This is known as 2nd trip detection.
DI-40
DIAGNOSTICS - ENGINE (1GR-FE)
S Freeze frame data:
The freeze frame data records the engine conditions (fuel
system, calculated load, engine coolant temperature, fuel
trim, engine speed, vehicle speed, etc.) when a malfunc-
tion is detected. When troubleshooting, freeze frame data
can help determine if the vehicle was running or stopped,
if the engine was warmed up or not, if the air-fuel ratio
was lean or rich, as well as other data from the time when
a malfunction occurred.
Priorities for troubleshooting:
When multiple DTCs occur, find out the order in which the DTCs
should be inspected by checking the component's DTC chart.
If no instructions are written in the DTC chart, check DTCs in the
following order of priority:
(a) DTCs other than fuel trim malfunction DTCs (P0171,
P0172, P0174 and P0175) and misfire DTCs (P0300 to
P0306).
(b) Fuel trim malfunction DTCs (P0171, P0172, P0174 and
P0175).
(c) Misfire DTCs (P0300 to P0306).
4. CHECK DLC3
The vehicle's ECM uses the ISO 9141-2 for communica-
tion protocol. The terminal arrangement of the DLC3 com-
1 2 3 4 5 6 7 8 plies with SAE J1962 and matches the ISO 9141-2 for-
9 10 11 12 13 14 15 16 mat.
DLC3
A04550
Symbol Terminal Description Condition Specified Condition
SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
CG (4) - Body ground Chassis ground Always Below 1
SG (5) - Body ground Signal ground Always Below 1
BAT (16) - Body ground Battery positive Always 11 to 14 V
CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF 54 to 69
CANH (6) - Battery positive HIGH-level CAN bus line Ignition switch OFF 1 M or higher
CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF 1 k or higher
CANL (14) - Battery positive LOW-level CAN bus line Ignition switch OFF 1 M or higher
CANL (6) - CG (4) LOW-level CAN bus line Ignition switch OFF 1 k or higher
HINT:
Connect the cable of the hand-held tester to the DLC3, turn the
ignition switch ON and attempt to use the hand-held tester. If
the screen displays UNABLE TO CONNECT TO VEHICLE, a
problem exists in the vehicle side or the tester side.
S If the communication is normal when the tool is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.
DI-41
DIAGNOSTICS - ENGINE (1GR-FE)
S If the communication is still impossible when the tool is
connected to another vehicle, the problem is probably in
the tool itself, so consult the Service Department listed in
the tool's instruction manual.
5. INSPECT BATTERY VOLTAGE
Battery Voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
6. CHECK MIL
(a) The MIL comes on when the ignition switch is turned ON
and the engine is not running.
HINT:
If the MIL is not illuminated, troubleshoot the MIL circuit (See
page DI-417).
(b) When the engine is started, the MIL should not illuminate.
If the lamp remains on, the diagnosis system has de-
tected a malfunction or abnormality in the system.
7. ALL READINESS
For this vehicle, using the hand-held tester allows readiness
codes corresponding to all DTCs to be read. When diagnosis
(normal or malfunctioning) has been complete, readiness
codes are set. Enter the following menus: ENHANCED OBD II
/ MONITOR STATUS on the hand-held tester.
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