Isuzu Trooper 1999 Workshop Manual page 1164

DTC P0502 – VSS Circuit Low Input (Cont'd)
Step
10 1. Ignition "OFF."
2. Disconnect the MAF sensor. The connector
attaches the VSS wires from the transmission
harness to the left-side engine harness.
3. Disconnect the black 16-way connector.
4. Select a terminal adapter from kit J 35616 that can
be used with a jumper to supply B+ to the blue wire
with a yellow tracer (transmission side of the
connector).
5. Use another terminal adapter to attach a voltmeter
to the light-green wire with a white tracer (next to the
wire in the previous step.)
6. Disconnect the blue connector next to the black
16-way connector, and locate the black/red tracer
wire at one corner of the blue connector. The
black/red wire is the VSS ground. Use a terminal
adapter to attach a jumper to ground to the
black/red VSS ground wire at the transmission side
of the blue connector.
7. Raise the rear wheels off the ground with
transmission in neutral.
Does the DVM toggle back and forth between 0.6 V and
10 V as the wheels (and driveshaft) are rotated?
11 Replace the VSS.
Is the action complete?
12 Check for an open or short between the PCM and the
speedometer.
Was a problem found?
13 Replace the PCM.
IMPORTANT: The
programmed.
Powertrain Control
procedures.
ANd also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action
replacement PCM
Refer to On-Vehicle Service in
Module and Sensors
Value(s)
—
—
—
must be
for
—
6E–363
Yes No
Go to Step 11 Go to Step 10
Verify repair —
Verify repair Go to Step 13
Verify repair —