DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) When troubleshooting OBD II (On-Board Diagnostics) vehicles, an OBD II scan tool (complying with SAE J1978) must be connected to the DLC3 (Data Link Connector 3) of the vehicle. Various data in the vehicle ECM (Engine Control Module) can be then read.
(b) OBD II regulations require that the vehicle on-board computer illuminate the MIL (Malfunction Indicator Lamp) on the instrument panel when the computer detects a malfunction in:
(1) The emission control system components.
(2) The powertrain control components (which affect vehicle emissions).
(3) The computer itself.
In addition, the applicable DTCs prescribed by SAE J2012 are recorded in the ECM memory. If the malfunction does not recur in 3 consecutive trips, the MIL turns off automatically but the DTCs remain recorded in the ECM memory.
(c) To check for DTCs, connect the Techstream to the DLC3. The Techstream displays
DTCs, freeze frame data, and a variety of the engine data. The DTCs and freeze frame
data can be cleared with the Techstream. In order to enhance OBD function on vehicles
and develop the off-board diagnosis system, Controller Area Network (CAN) communication
is used in this system. CAN is a network which uses a pair of data transmission
lines spanning multiple computers and sensors. It allows for high speed communications
between the systems and simplification of the wire harness connections (See page
).
2. NORMAL MODE AND CHECK MODE
(a) 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. Check mode is also available as an option for technicians. In check mode, 1 trip detection logic is used for duplicating malfunction symptoms and increasing the system's ability to detect malfunctions, including intermittent problems (the Techstream only).
3. 2 TRIP DETECTION LOGIC
(a) When a malfunction is first detected, the malfunction is temporarily stored in the ECM memory (1st trip). If the same malfunction is detected during the subsequent driving cycle, the MIL is illuminated (2nd trip).
4. FREEZE FRAME DATA
(a) The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
(b) The Techstream records freeze frame data in 5 different instances: 1) 3 times before the DTC is stored, 2) once when the DTC is stored, and 3) once after the DTC is stored. These sets of data can be used to simulate the vehicle condition around the time when the malfunction occurred. The data may help in finding the cause of the malfunction, or in judging if the DTC was caused by a temporary malfunction.
5. DLC3 (Data Link Connector 3)
(a) Check the DLC3 (See page ).
6. BATTERY VOLTAGE
Standard Voltage:
11 to 14 V
7. MIL (Malfunction Indicator Lamp)
(a) The MIL illuminates when the turning the ignition switch to ON (the engine is not running).
(b) The MIL should turn off when the engine is started. If the MIL remains illuminated, the diagnosis system has detected a malfunction or abnormality in the system.
HINT:
If the MIL does not illuminate when the turning the ignition switch to ON, check
the MIL circuit (See page ).
Wireless Charger Illumination Circuit
DESCRIPTION
When the light control switch is turned to the tail or head position, this circuit
sends an illumination signal to the mobile wireless charger cradle assembly. Based
on this signal, the mobile wireless charger cradle assembly dims the indicator lights
(green and amber).
WIRING DI ...
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Charging System
DTC Code
Detection Item
Warning Indicate
Memory
SAE
See page
P161A87
Lost Communication with Alternator Missing Message
-
DTC stored
...
Transfer Oil
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. CHECK TRANSFER OIL
(a) Remove the filler plug and gasket.
Text in Illustration
*1
Filler Plug
(b) Check that the ...