Chart B-1 With The Key In The On Position (Before Starting The Engine). Warning Light (W/L) Is Not Activated; Chart B-2 Ehcu Abnormality (Dtc 14) - Isuzu Trooper 1999 Workshop Manual

Chart B-1 With the key in the ON position (Before starting the engine). Warning light (W/L)
is not activated.
Step
1 Is W/L fuse C-10 disconnected?
2 Is W/L burnt out?
3 1. Turn the key off.
2. Disconnect EHCU connector.
3. Turn the key ON.
4. Measure the voltage between EHCU connector terminal 16
and 15.
Is the voltage equal to the battery voltage?
4 Is there continuity between EHCU connector terminals, 12 and 15
and body ground.
5 Reconnect all components, ensure all components are properly
mounted.
Was this step finished?

Chart B-2 EHCU Abnormality (DTC 14)

Step
1 1. Turn the key off.
2. Disconnect the EHCU connector.
3. Inspect EHCU ground.
Is there resistance between the EHCU connector terminals, 12
and 15 and body ground?
2 1. Turn the key off, connect the EHCU.
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?
3 1. Reconnect all components and ensure all components are
properly mounted.
2. Clear diagnostic trouble code.
Was this step finished?
Action
Action
BRAKE CONTROL SYSTEM
Yes
Replace fuse.
Go to Step 5
Replace W/L
bulb.
Go to Step 5
Go to Step 4
Check harness
for suspected
disconnection.
No fault found:
Replace EHCU.
Go to Step 5
Repeat the "Basic
diagnostic flow
chart."
Yes
Go to Step 2
Replace EHCU.
Go to Step 3
Repeat the "Basic
diagnostic flow
chart."
5A–27
No
Go to Step 2
Go to Step 3
Repair harness
and connector.
Go to Step 5
Repair harness
and connector.
Go to Step 5
Go to Step 5
No
Repair the body
ground harness.
Go to Step 3
Inspect in
accordance with
the DTC
displayed.
Go to Step 3