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 a vehicle with a warmed-up 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.
(a) VIBRATION METHOD: When a malfunction seems to occur as a result of vibration.
(1) PART AND SENSOR
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 relays. |
(2) CONNECTORS
Slightly shake the connector vertically and horizontally.
(3) WIRE HARNESS
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.
(b) HEAT METHOD: When a malfunction seems to occur when the area in question is heated.
(1) Heat the component that is the possible cause of the malfunction with a hair dryer or similar device. Check if the malfunction occurs.
NOTICE:
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(c) WATER SPRINKLING METHOD: When a malfunction seems to occur on a rainy day or in high-humidity.
(1) Sprinkle water onto the vehicle and check if the malfunction occurs.
NOTICE:
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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.
(d) HIGH ELECTRICAL LOAD METHOD: When a malfunction seems to occur when electrical load is excessive.
(1) Turn on the heater blower, headlight, rear window defogger and all other electrical loads.
Check if the malfunction reoccurs.
Open in Curtain Shield Squib RH Circuit
DTC B1161/84 Open in Curtain Shield Squib RH Circuit
DESCRIPTION
The curtain shield squib RH circuit consists of the center airbag sensor
assembly and the curtain shield
airbag assembly RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1161/84 is recorde ...
Road test
1. PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem
analysis, try to reproduce the symptoms. If the
problem is that the transaxle does not shift up, shift
down, or the shift point is too high or too low,
conduct the following road test referring to the
automatic shi ...
Steering Angle Sensor Zero Point Malfunction
DTC C1290/66 Steering Angle Sensor Zero Point Malfunction
DESCRIPTION
The skid control ECU acquires steering angle sensor zero point every time the
ignition switch is turned to
the ON position and the vehicle is driven at 35 km/h (22 mph) or more for
approximately 5 seconds. The
ECU also sto ...