CHECK FOR INTERMITTENT PROBLEMS
HINT:
Inspect the vehicle ECM using check mode. Intermittent problems are easier to detect with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1 trip detection logic, which is more sensitive to malfunctions than normal mode (default), which uses 2 trip detection logic.
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System Diagram
How To Proceed With TroubleshootingSystem Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU (Transmitter)
Receiving ECU (Receiver)
Signal
Line
Certification ECU
(Smart Key ECU Assembly)
Main Body ECU
(Multiplex Network Body ECU)
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Parking Brake Switch Circuit
DESCRIPTION
This circuit is from the parking brake switch assembly to the navigation receiver
assembly.
WIRING DIAGRAM
PROCEDURE
1.
CHECK VEHICLE SIGNAL (OPERATION CHECK)
(a) Display the "Vehicle Signal Check Mode" screen (See page
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Diagnosis System
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) ...