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.
Fog light relay
On-vehicle inspection
Inspect front fog light relay
Remove the front fog relay from the no. 6 Relay
block.
Measure the resistance of the relay.
Standard resistance
If the result is not as specified, replace the relay. ...
Parking brake lever
Components
On-vehicle inspection
Check parking brake switch assembly
Remove the rear console box (see page ip-16).
Hint:
Refer to the procedures from the removal of the no.
1 Console upper panel garnish up until the removal
of the rear console box sub-assembly.
Discon ...
Center airbag sensor assembly communication circuit malfunction
Description
The center airbag sensor communication circuit consists of the occupant
classification ecu and the
center airbag sensor.
Dtc b1790 is recorded when a malfunction is detected in the center airbag sensor
communication circuit.
Wiring diagram
Inspection procedure
Hin ...