Isuzu 1999 RODEO Workshop Manual page 279

4B–12 DRIVELINE CONTROL SYSTEM
Diagnosis of The Faults Based on the
Status of 4WD Indicator Lamp, 4WD
Switch and T/F Change Lever
Diagnosis charts are shown on below. If troubles can not
be solved after every chart was traced, troubles may
occur in the ECU. In this case, replace the ECU and trace
every chart again.
Fault on Switching from 2WD to 4WD
1. In case that 4WD indicator's blinking changes
from 2Hz to 4Hz after Solution 1 is carried out.
Faults occur in the motor actuator or the transfer case
assembly. Remove the motor actuator and check
function. If problem was found and it was repaired, try
Solution 1 again. After that, disassemble the
transfer case assembly for check and repair or
replace. If incident is not improved after above
mentioned actions were taken, replace the ECU.
2. In case that 4WD indicator dose not blink nor
light, when switching from 2WD to 4WD.
Step
1
Is ignition turned on?
2
Dose the indicator light during two seconds initialization after
ignition is turned on?
3
Is the 4WD switch turned from 2WD to 4WD?
Action Yes
Turn on the
ignition and trace
this chart from
Go to Step 2
Burning out of
indicator lamp or
disconnection of
harness wire.
Trace this chart
from the start
after repair or
Go to Step 3
Short-circuit
(body short) on
harness of the
4WD switch.
Fault of the 4WD
switch (holding
the closed
condition).
Trace this chart
from the start
after repair or Push the 4WD
switch to 4WD.
replace.
No
start.
replace.