Isuzu 2000 Trooper Workshop Manual page 1222

Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Does the speedometer work?
3 1. Disconnect the VSS connector.
2. Ignition "ON."
3. Using a test light to battery +, probe the connector
ground wire.
Did the light illuminate?
4 Repair the sensor ground.
Is the action complete?
5 1. Ignition "ON," sensor disconnected.
2. Using a DVM, measure at the VSS connector
between ground and voltage supply.
Was the measurement near the specified value?
6 Repair the open or short to ground which may have
blown the meter fuse.
Is the action complete?
7 1. Ignition "ON," VSS disconnected.
2. Using a DVM, measure at the VSS connector
between ground
speedometer.
Was the measurement near the specified value?
8 Check for an open or short circuit between the
speedometer and the VSS.
Was an open or short circuit located?
9 Replace the speedometer.
Is the action complete?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0502 – VSS Circuit Low Input
Action
and the wire from
Value(s)
— Go to Step 2
— Go to Step 10
— Go to Step 5
— Verify repair
Battery
voltage Go to Step 7
— Verify repair
the
Go to Step 9
7.5-8 V
— Verify repair
— Verify repair
6E–353
Yes No
Go to OBD
System
Check
Go to Step 3
Go to Step 4
—
Go to Step 6
—
Go to Step 8
Go to Step 9
—