Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 1178
BRAKE CONTROL SYSTEM
5A–41
Chart B-3 Low or High Ignition Voltage (DTC 15 (Flash out) / C0277, 0278 (Serial
communications))
Chart B-4 Excessive Dump Time (DTC 17 (Flash out) / C0269 (Serial communications))
Chart B-5 Excessive Isolation Time (DTC 18 (Flash out) / C0274 (Serial communications))
Step
Action
Yes
No
1
Is the battery voltage normal? (Battery capacity check)
Go to Step 2
Charge or
replace battery.
Go to Step 2
2
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Turn the key on.
Is the voltage between coil integrated module connector (C-4)
terminals 1 and 7, higher than 10V?
Check harness
connector for
suspected
disconnection
Fault found:
Repair, and
perform system
self-check
No fault found:
replace EHCU.
Go to Step 3
Repair harness
or connector.
Go to Step 3
3
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
Step
Action
Yes
No
1
Check for anything causing extended ABS activation, such as
locked brakes or an erratic speed sensor signal.
Was a problem found?
Repair or Replace
Go to Step 2
2
1. The key turned off.
2. Replace EHCU.
3. Reconnect all components, ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 2
Step
Action
Yes
No
1
Check for anything causing extended ABS activation, such as
locked brakes or an erratic speed sensor signal.
Was a problem found?
Repair or Replace
Go to Step 2
2
1. The key turned off.
2. Replace EHCU.
3. Reconnect all components, ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 2
5A–42
BRAKE CONTROL SYSTEM
Chart B-6 G-Sensor Output Failure (DTC 21 (Flash out) / C0276 (Serial communications))
Chart B-7 Brake Switch Failure (DTC 22 (Flash out) / C0281 (Serial communications))
Step
Action
Yes
No
1
1. Turn the key off.
2. Replace EHCU.
3. Reconnect all components, ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 1
Step
Action
Yes
No
1
Is the stop light actuated when the brake pedal is depressed?
Go to Step 2
Go to Step 4
2
1. Turn the key off.
2. Disconnected coil integrated module connector.
Is the check voltage between coil integrated module connector
(C-4) terminals 13 to 7 when brake pedal is depressed the
battery voltage?
Go to Step 3
Harness
between brake
SW and coil
integrated
module is faulty.
Go to Step 6
3
Is the check that pins C-5 connector 2, and C-4 connector 7 have
good ground?
Check harness
/ connector for
disconnection
Fault found:
Repair, and
perform system
self-check.
No fault found:
replace EHCU.
Go to Step 6
Repair.
Go to Step 6
4
Is stop light fuse normal?
Go to Step 5
Replace.
Go to Step 6
5
Is brake SW normal?
Abnormal
harness in stop
light circuit.
Repair the
harness.
Go to Step 6
Replace.
Go to Step 6
6
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 6
BRAKE CONTROL SYSTEM
5A–43
Chart B-8 2WD Controller in 4WD Vehicle Controller (DTC 13 (Flash out) / C0285 (Serial
communications)), 4WD State Input Signal Failure (DTC 24 (Flash out) / C0282 (Serial
communications))
Chart B-9 Pump Motor Failure (DTC 32 (Flash out) / C0267, C0268 (Serial communications))
Step
Action
Yes
No
1
Remove coil integrated module connector.
Is the coil integrated module connector (C-4) terminal 8 line
normally?
Go to Step 2
Repair.
Go to Step 3
2
Is the 4WD controller normally?
Replace EHCU.
Go to Step 3
Replace 4WD
controller.
Go to Step 3
3
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Measure the voltage between terminal 1 of the coil integrated
module connector (C-5) and body ground.
Is the voltage equal to the battery voltage?
Go to Step 2
Repair fuse/
harness
between battery
and coil
integrated
module
connector (C-5)
terminal 1.
Go to Step 5
2
Is the harness from the hydraulic unit connected to the coil
integrated module connector?
Go to Step 3
Connect to the
connector.
Go to Step 3
3
Is the hydraulic unit harness in good condition?
Go to Step 4
Replace EHCU.
Go to Step 5
4
Is the resistance of hydraulic unit connector terminals 1 and 2
between 0.2 and 1.0 ohms?
Replace EHCU.
Go to Step 5
Replace EHCU.
Go to Step 5
5
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 5
5A–44
BRAKE CONTROL SYSTEM
Chart B-10 EHCU Valve Relay Failure (DTC 35 (Flash out) / C0265, C0266 (Serial
communications))
Chart B-11 FL Isolation Solenoid Coil Failure (DTC 41 (Flash out) / C0245, C0247 (Serial
communications))
Chart B-12 FL Dump Solenoid Coil Failure (DTC 42 (Flash out) / C0246, C0248 (Serial
communications))
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect coil integrated module connector.
3. Measure the voltage between terminal 1 of the coil integrated
module connector (C-5) and body ground.
Is the voltage equal to the battery voltage?
Replace EHCU.
Go to Step 2
Repair fuse and
harness
between coil
integrated
module
connector (C-5)
terminal 1 and
battery.
Go to Step 2
2
1. Reconnect all components, ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 2
Step
Action
Yes
No
1 Was
the
“EHCU Connector Pin–out Checks” performed?
Go to Step 2
Go to “EHCU
Connector Pin–out
Checks.”
2
1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the
EHCU.
3. Inspect the connector for damage or corrosion.
Is the connector free from damage or corrosion?
Go to Step 3
Repair the
connector. Repeat
the “Basic
Diagnostic Flow
Chart.”
3
1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
Step
Action
Yes
No
1 Was
the
“EHCU Connector Pin–out Checks” performed?
Go to Step 2
Go to “EHCU
Connector Pin–out
Checks.”
2
1. Turn the key switch to off.
2. Disconnect the 2–way EHCU connector (C–5) from the
EHCU.
3. Inspect the connector for damage or corrosion.
Is the connector free from damage or corrosion?
Go to Step 3
Repair the
connector. Repeat
the “Basic
Diagnostic Flow
Chart.”
3
1. Replace the Coil Integrated Module.
2. Reconnect all components, ensure all components are
properly mounted.
Was this step finished?
Repeat the “Basic
diagnostic flow
chart”
Go to Step 3
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