Acura NSX 1997 Service Manual page 1306

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Troubleshooting Precautions
ABS Indicator
1. If the system is OK, the ABS indicator comes on for two seconds (initial turn on) after turning the ignition switch ON (II),
then the ABS indicator goes off. After that time, the ABS indicator comes on again after starting the engine, then the
ABS indicator goes off two seconds after the ignition switch return to ON (II). This occurs because the ABS control unit
activates by the power source circuit that is connected only when the ignition switch is ON (II).
2. If a problem occurs, the Central Processing Unit (CPU) diagnoses the problem area and the problem condition, then the
CPU memorizes the Diagnostic Trouble Code (DTC) and turns on the ABS indicator. If the system is OK, the ABS indicator
does not come on except when the ignition switch is initially turned on.
3. If the problem is detected intermittently or continuously, the ABS indicator indication pattern is different as described
below.
• DTC 61 or 62:
The ABS indicator comes on when a problem is detected in every time the system is activated, and the ABS indicator
goes off when the system returns to normal.
• DTC 11, 13, 15, 17, 31, 32, 33, 34, 35, 36, 37, 38, 54, 71 or 81:
The ABS indicator comes on when a problem is detected in every time the system is activated, and the ABS indicator
continues on until the ignition switch is turned OFF regardless of the system returns to normal or not.
• DTC 12, 14, 16, 18, 21, 22, 23, 24, 41, 42, 43, 44, 51, 52 or 53:
The ABS indicator comes on when a problem is detected, and the ABS indicator continues on until the ignition switch
is turned OFF. The ABS indicator goes off when the system is activated the next time.
4. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even though the
system is operating properly, the ABS indicator will come on, under the following conditions. To determine the actual
cause of problem, question the customer about the problem, taking these conditions into consideration.
• Only drive wheel (or wheels) rotate
• One drive wheel is stuck
• Vehicle spin
• ABS continuous operate for a long time
• Signal disturbance
Diagnostic Trouble Code (DTC)
1. If a problem occurs in the system, the Central Processing Unit (CPU) diagnoses the problem area and the problem
condition, then the CPU memorizes the Diagnostic Trouble Code (DTC) into the EEPROM (non-volatile memory).
2. The DTC clearing is possible only when performing the specified procedures, and the DTC is not cleared under the
following conditions.
• Turning the ignition switch off or disconnecting the battery terminal
• The system returns to normal
3. The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the later one is
written over the previous one. Therefore, when the same problem is detected repeatedly, it is memorized as one DTC.
4. The DTCs are indicated in the order of ascending number, not in the order they occur.
5. Perform the specified procedures to indicate the DTCs.
Self-diagnosis
1. Self-diagnosis can be classified into two categories.
• Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.
• Regular diagnosis: Performed right after the initial diagnosis and until the ignition switch is turned off.
2. When a problem is detected by self-diagnosis, the system
• Turns the ABS indicator ON
• Memorizes the DTC
• Stops ABS control
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