Honda 2004 Odyssey Service Manual page 1298

ABS Self-Diagnosis
• The ABS/TCS control unit is equipped with a main CPU and a sub-CPU. Each CPU checks the other for problems.
• The CPUs check the circuit of the system.
• Self-diagnosis can be classified into two categories:
– Initial diagnosis: Done right after the engine starts and until the ABS or TCS indicator goes off
– Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned OFF
• When a problem is detected by self-diagnosis, the ABS/TCS control unit shifts to fail-safe mode.
ABS Self-diagnosis Table
Diagnostic
Trouble Code
(DTC)
11, 13, 15, 17 Wheel sensor (open/short to body ground/short
to power)
12, 14, 16, 18 Wheel sensor (electrical noise/intermittent
interruption)
21 24 Pulser
31 38 Solenoid (short to body ground/short to wire)
41 44 Wheel lock
51 Motor lock
52 Motor stuck OFF
53 Motor stuck ON
54 ABS fail-safe relay
61 Low ignition voltage
62 High ignition voltage
71 Different diameter tire
81 Central Processing Unit (CPU), ROM/RAM
NOTE:
• At the DTCs with '' '' mark, there are cases that the ABS/TCS control unit shifts to fail-safe mode A1, L1 when the
ABS/TCS control unit detects more than one DTC and for different wheel.
• If the ABS/TCS control unit detects the DTCs which have different fail-safe mode individually, the ABS/TCS control
unit take priority the large number mode.
Detection Item Detection Timing
Initial Regular
Diagnosis Diagnosis
Fail-safe Mode
A0
A0, L0
A0, L0
S1
A0, L0
A0, L0
A0, L0
A0, L0
S1
B0, B1
B0
S1
S1, A1
(cont'd)
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