Isuzu Trooper (1998-2002 year). Manual — part 206
5A–44
BRAKE CONTROL SYSTEM
Chart B-3 Power Voltage Drop (DTC 15)
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 EHCU connector.
3. Turn the key on.
Is the voltage between EHCU connector terminals 8 and 15,
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 CLASS-2 Communication Line Abnormality (DTC 16)
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU and PCM connector.
Is there continuity between EHCU connector terminals 25 and
ground?
Go to Step 2
Repair harness or
connector.
Go to Step 3
2
1. Connect EHCU connector.
2. Clear diagnostic trouble code.
3. Turn the key on.
Is the diagnostic trouble code 16 shown on the displayed?
Check the PCM
harness. Refer to
6E section.
Go to Step 3
Replace EHCU.
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
5A–45
BRAKE CONTROL SYSTEM
Chart B-5 G-Sensor Circuit (DTC 21)
Step
Action
Yes
No
1
Vehicle placed horizontal.
Is the resistance between the G sensor connector terminals 1 and
2 within 4.0-6.0 k
W
?
Check harness
connector for
short.
Fault found :
Repair , and
perform system
self-check.
No fault found :
replace EHCU.
Go to Step 3
Go to Step 2
2
Is the bracket installed horizontally?
Go to Step 4
Repair or replace
bracket.
Go to Step 4
3
Remove G sensor.
Is the resistance between the G sensor connector terminals 1 and
2 within 1.0-2.0 k
W
when G sensor is horizontal?
Go to Step 4
Replace G
sensor.
Go to Step 5
4
Measure resistance between G sensor connector terminals 1 and
2 within 4.0-6.0 k
W
when G sensor tilted to 30
°
or more?
Harness between
EHCU and G
sensor is faulty
and short.
Repair the
harness
Go to Step 5
Replace G
sensor.
Go to Step 5
5
1. Reconnect all components and 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–46
BRAKE CONTROL SYSTEM
Chart B-6 Abnormal Transmission Input (DTC 23)
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
Is there continuity between EHCU connector terminal 6 to 15
(Gear position-P(A/T), N(M/T))?
Shorted switch
harness.
Repair switch or
harness.
Go to Step 6
Go to Step 2
2
Is the vehicle an A/T model?
Go to Step 3
Go to Step 4
3
Turn the key on and measure the voltage between EHCU
connector terminal 6 and 15.
Is the 6V under when the gear position is L, and R(Battery voltage
12V)?
Go to Step 5
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
Go to Step 6
4
Turn the key on and measure the voltage between EHCU
connector terminal 6 and 15.
Is the 9.6V over when the gear position is 1, 2, R(Battery voltage
12V)?
Go to Step 5
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
Go to Step 6
5
Is there 6.6 to 9.0V when the gear position is 3, 4, 5 and N(M/T) or
2,3,D,N and P(A/T)(Battery voltage 12V)?
Suspected
harness/
connector short
power
source/GND.
Suspected
shorted
transmission SW.
Fault found:
repair, and
perform system
self-check.
No fault found:
replace EHCU.
Go to Step 6
Transmission SW
trouble.
Disconnected
harness.
Repair SW and
harness.
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
5A–47
BRAKE CONTROL SYSTEM
Chart B-7 Transfer Monitor (DTC 24)
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
Is the EHCU connector terminal 9 line normally?
Go to Step 2
Repair
Go to Step 3
2
Is the TOD ECU or 4WD controller normal?
Replace EHCU.
Go to Step 3
Repair or replace
TOD ECU or
4WD contrder.
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-8 EHCU Pump Motor And Motor Relay Circuit (DTC 32)
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure voltage between EHCU connector terminal 13 and
body ground.
Is the voltage equal to battery voltage?
Go to Step 2
Repair
fuse/harness
between battery
and EHCU
connector
terminal 13.
Go to Step 3
2
Is there continuity between EHCU connector terminal 12 and
ground?
Go to Step 3
Repair between
EHCU connector
terminal 12 and
ground.
Go to Step 3
3
1. Reconnect all components and 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-9 EHCU Pump Valve And Valve Relay Circuit (DTC 35)
Step
Action
Yes
No
1
1. Turn the key off.
2. Disconnect EHCU connector.
3. Measure voltage between EHCU connector terminal 14 and
body ground.
Is the voltage equal to battery voltage?
Replace EHCU.
Go to Step 2
Repair fuse and
harness EHCU
connector
terminal 14 and
battery.
Go to Step 2
2
1. Reconnect all components and 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
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