Page 24 - Workshop Manual - Aumark (BJ1051)

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Introduction-How to Troubleshoot the Vehicle

How to Diagnose and Troubleshoot Problems

Tips:
• Only basic operation procedures are listed here briefly.
• Please perform trouble diagnosis and troubleshooting according to the operation procedures
described hereunder.
• For each circuit, the most effective trouble diagnosis and troubleshooting descriptions are
available in this manual. (Refer to “Chapter 04 Diagnosis”.)
• Before starting any maintenance operation, be sure to determine trouble diagnosis and
troubleshooting procedures for related circuits first.
1. Faulty vehicle check-in

2. Analysis of customer complaints
(a) Inquire the customer about the vehicle condition and environment-related information when
the malfunction occurred.
3. Identifying symptoms and checking diagnostic trouble code/blink code (DTC/BC)
(a) Check battery voltage.
01 Voltage: 22~28V (engine off)

(b) Visually check harnesses, connectors, and fuses for open or short circuit.
(c) Start the engine and warm it up until its normal operating temperature.

(d) Search in symptoms chart and list of DTC/BC according to symptoms and set conditions.
Is it found in symptoms chart or list of DTC/BC?

Symptoms chart > Go to step 5.
List of DTC > Go to step 4.
4. List of DTC/BC

(a) Check the data obtained in step 3 and then determine the inspection procedures of the
systems or parts to be checked using list of DTC/BC.
Go to step 6 directly.
5. Symptoms chart
(a) Check the data obtained in step 3 and then determine the inspection procedures of the
systems or parts to be checked using symptoms chart.
6. Circuits and parts inspection
(a) Identify circuits of the systems or parts determined in steps 4 and 5.

7. Maintenance
(a) Repair damaged systems or parts according to the instructions in step 6.
8. Validation test
(a) After the maintenance and repair work is completed, be sure to confirm if the trouble has
been eliminated.
(b) If the trouble persists, perform a vehicle validation test by simulating the vehicle and
environmental conditions of the vehicle when this malfunction occurred for the first time.
9. Finish

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