Isuzu N-Series. Service manual — part 243
ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-37
Chart A-4, TA-4 Braking Sound (from Hydraulic Unit) Is Heard While Not Braking
Step
Action
Value(s)
YES
NO
1
Is this the first time the vehicle is being driven
after starting the engine?
—
It is self checking
sound.
Normal.
2
Is vehicle speed under 10 km/h (6 mph)?
—
It is self checking
sound.
Normal.
3
Check for the following condition:
• At the time of shift down or clutch op-
eration.
• At the time of low
µ drive (ice or snow
road) or rough road drive.
• At the time of high-speed turn.
• At the time of passing curb.
• At the time of operating electrical
equipment switches.
• At the time of racing the engine.
Did it occur under any one condition above?
—
ABS may some-
time be actuated
even when brake
pedal is not
applied.
4
Is there play in each sensor/wheel speed sen-
sor rotor?
—
Repair.
5
Damage or powdered iron sticking to each
sensor/wheel speed sensor rotor?
—
Repair.
6
Is each sensor output normal? (Refer to chart
C-1-1 to C-1-4 or TC-1).
—
Check harness/
connector for sus-
pected disconnec-
tion.
If no disconnection
is found, replace
EHCU.
Repair.
7
Reconnect all components, ensure all compo-
nents are properly mounted.
Was this step finished?
—
Repeat the “Basic
diagnostic flow
chart”.
—
5A4-38 ANTI-LOCK BRAKE SYSTEM (ABS)
DIAGNOSTIC TROUBLE CODES
Diagnostic Trouble Codes
Choose and trace an appropriate flowchart by the numbers listed below to find fault and repair.
* Important: DTC 20 (Reference Voltage High) cannot be indicated by Tech 2. DTC 20 can be indicated and confirmed
by flashing using Diagnosis Switch.
Code
Diagnosis
Item (except Wiring)
Chart No.
Flash
out
Serial
Communications
12
—
Normal
—
—
13
C0213
Vehicle Type Error
EHCU
1
14
C0214
EHCU Abnormality
EHCU
2
15
C0215
Low Power Voltage
EHCU
3
25
C0225
Exhaust Brake Cut Circuit Abnormality
Relay or EHCU
4
33
C0233
Motor Drive Circuit Abnormality
EHCU
5
34
C0234
Abnormal Motor Rotation
EHCU
6
41
C0241
Solenoid Valve Power Supply Abnormality
EHCU
7
43
C0243
Solenoid Valve Circuit Abnormality
EHCU
8
45
C0245
Solenoid Valve Circuit Abnormality
51
C0251
FL Speed Sensor Circuit Abnormality
Sensor, EHCU
9
52
C0252
FR Speed Sensor Circuit Abnormality
10
53
C0253
RL Speed Sensor Circuit Abnormality
11
54
C0254
RR Speed Sensor Circuit Abnormality
12
61
C0261
Abnormal FL Speed Sensor Signal
13
62
C0262
Abnormal FR Speed Sensor Signal
14
63
C0263
Abnormal RL Speed Sensor Signal
15
64
C0264
Abnormal RR Speed Sensor Signal
16
ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-39
DIAGNOSIS BY “ABS” WARNING LIGHT ILLUMINATION PATTERN
Diagnosis by “ABS” Warning Light Illumination Pattern
In the event that there is abnormality in the “ABS” warning light illumination pattern while the key is in the ON position
or if the warning light is actuated during driving, trouble should be diagnosed on a illumination pattern basis as follows:
No.
Condition
“ABS” Warning Light Illumination Pattern
Diagnostic
1
Warning light is actu-
ated normally
Normal
2
Warning light is not lit
Warning light lighting cir-
cuit trouble
→ Go to Chart
B-1
N5A1061E
N5A1062E
5A4-40 ANTI-LOCK BRAKE SYSTEM (ABS)
Diagnostic Trouble Codes (DTCs)
When the warning light in the meter remains ON, the EHCU stores the fault identification and disables the ABS.
1. How to start DTC display:
• Confirm that the vehicle has come to a complete stop (with the wheels standing still) and that the brake pedal
is not depressed.
(Unless these two conditions are satisfied, DTC display cannot be started.)
• With the key switch OFF and short B-79 diagnosis connector terminal 12 to ground.
Then turn the key switch ON.
• DTCs can be displayed also by Tech 2.
The DLC (for Tech 2) Is Located Behind The Driver Side Lower Cluster Panel
2. DTC display:
• DTC is displayed by blinking warning light.
• Double-digit display.
• First, normal DTC 12 is displayed three times and then any other DTCs are displayed three times. (If no other
DTCs have been stored, the display of DTC 12 will be repeated.)
3
Warning light is actu-
ated while driving
Diagnostic trouble codes
are stored.
Display diagnostic trouble
codes and diagnose on a
code basis according to
the flow charts.
No.
Condition
“ABS” Warning Light Illumination Pattern
Diagnostic
N5A1063E
N5A1034E
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