Hint:
The most difficult case in troubleshooting is when no problem symptoms occur. In such a case, a thorough problem analysis must be carried out. A simulation of the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be carried out. No matter how much skill or experience a technician has, troubleshooting without confirming the problem symptoms will lead to important repairs being overlooked and mistakes or delays.
For example:
With a problem that only occurs when the engine is cold or as a result of vibration caused by the road during driving, the problem can never be determined if the symptoms are being checked on a stationary vehicle or on a vehicle with a warmedup engine. Vibration, heat or water penetration (moisture) is difficult to reproduce. The symptom simulation tests below are effective substitutes for the conditions and can be applied on a stationary vehicle.
Important points in the symptom simulation test: in the symptom simulation test, the problem symptoms as well as the problem area or parts must be confirmed. First, narrow down the possible problem circuits according to the symptoms. Then, connect the tester and carry out the symptom simulation test, judging whether the circuit being tested is defective or normal. Also, confirm the problem symptoms at the same time.
Refer to the problem symptoms table for each system to narrow down the possible causes.
When a malfunction seems to occur as a result of vibration.
Apply slight vibration with a finger to the part of the sensor suspected to be the cause of the problem, and check whether or not the malfunction occurs.
Notice:
Applying strong vibration to relays may open them.
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
Hint:
The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.
When a malfunction seems to occur when the area in question is heated.
Notice:
Do not heat to more than 60°c (140°f).
Exceeding this temperature may damage components.
When a malfunction seems to occur on a rainy day or in high-humidity.
Notice:
Hint:
If the vehicle has or had a water leakage problem, the leakage may have damaged the ecu or connections. Look for evidence of corrosion or short circuits. Proceed with caution during water tests.
When a malfunction seems to occur when the electrical load is excessive.
Check if the malfunction reoccurs.
System description
General
This system has the following functions: manual slide
open and close; auto slide open and close; manual tilt up
and down; auto tilt up and down; jam protection; and key
off operation.
Function of main component
System operation
The sliding roof has the following ...
Cold start
Description
The electronic throttle control system (etcs) controls the engine idling
speed. The etcs operates the
throttle actuator to open and close the throttle valve, and adjusts the intake
air amount to achieve the
target idling speed.
In addition, the ecm retards the ignition timi ...
Short in front driver side - side squib circuit
Description
The driver side - side squib circuit consists of the center airbag sensor and
the front seat side airbag lh.
This circuit instructs the srs to deploy when the deployment conditions are met.
These dtcs are recorded when a malfunction is detected in the driver side - side
sq ...