5A–41
BRAKE CONTROL SYSTEM
Chart B-2 CPU Error (DTC 14 (Flash out) / C0271, C0272, C0273, C0284 (Serial
communications))
Step
Action
Yes No
1 1. Turn the key off.
2. Disconnected coil integrated module connector.
3. Inspect coil integrated module ground.
Is the check resistance between the coil integrated module
connector terminals, 2 (C-5) and 7 (C-4) and body ground?
Go to Step 2
Repair the body
ground harness.
Go to Step 3
2 1. Turn the key off, connect the coil integrated module connector.
2. Erase the trouble code.
3. Turn Ignition off, then on, to perform system self-check.
4. If warning light remains on, display trouble codes once again.
Is the check trouble code 14 (Flash out) / C0271, C0272, C0273,
C0284 (Serial communications)?
Replace EHCU.
Go to Step 3
Inspect in
accordance with
the DTC
displayed.
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
Chart B-3 Low or High Ignition Voltage (DTC 15 (Flash out) / C0277, 0278 (Serial
communications))
Step
Action
Yes No
1 Is the check 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 check 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
Chart B-4 Excessive Dump Time (DTC 17 (Flash out) / C0269 (Serial communications))
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
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