Acura 3.5 RL Manual page 836

Self-diagnosis
1. The ABS control unit is equipped with a main CPU and a sub CPU, that check each other for problems.
2. The CPUs check the circuit of the system.
3. Self-diagnosis can be classified into 2 categories.
Initial diagnosis: Performed right after the engine starts and until the ABS indicator goes off.
Regular diagnosis: Performed right after the initial diagnosis until the ignition switch is turned OFF.
4. When a problem is detected by self-diagnosis, the system:
Turns the fail-safe relay OFF
Turns the solenoid valve OFF
Turns the pump motor OFF
Turns the ABS indicator ON
Self-diagnosis Table
Diagnostic Trouble
Code(DTC)
Wheel sensor (open/short to body ground/short to power)
11, 13, 15, 17
12,14,16,18 Wheel sensor (electrical noise/intermittent Interruption)
Pulser
21-24
Solenoid (short to body ground/short to wire)
31-38
Wheel lock
41-44
Motor lock
51
Motor stuck OFF
52
Motor stuck ON
53
Fall-safe relay
54
Low ignition voltage
61
High ignition voltage
62
Different diameter tire
71
Central Processing Unit (CPU) diagnosis, and ROM/RAM diagnosis
81
Operation Mode Table
Operation
Mode
Regular
Operation in normal condition
operation
Fail-safe
The ABS control unit turns the system off when the control unit detects a problem.
mode-S
If the ABS control unit detects a malfunction during an emergency stop, it will turn off the malfunc-
Fail-safe
tioning component, and continue to modulate the rest of the ABS system until the vehicle comes to
mode-A
a stop. At that, the entire system will be turned off until the problem goes away.
The ABS control unit stores a DTC in back-up memory when it detects a problem. If a problem is
Fail-safe
detected when the ignition switch is turned ON (II), the ABS control unit will turn the system off. If
mode-L
the problem goes away, the ABS control unit will turn the system on again.
Fail-safe The ABS control unit will turn the system off if ignition voltage drops, and will turn on again when
ignition voltage returns to normal.
mode-B
On-board Diagnosis Function
The ABS control unit is connected to the 16P Data Link Connector.
The ABS can be diagnosed with the Honda PGM Tester.
The ALB Checker cannot be used with this system. For air bleeding, and checking wheel sensor signals, use the Honda
PGM Tester. See the Honda PGM Tester user's manuals for specific operating instructions.
Detection Item
Description
Detection
Timing
Fail-safe Mode
O
A
O
S, A and L, S and L
O A and L
O O S
O A and L
S and L
O
A and L
O
O O
A and L
O S
O B
B
O
O S
O O S
ABS Indicator
OFF
Comes ON when a
problem is detected.
Comes ON when a
problem is detected.
ON
Comes ON when a
problem is detected.