Isuzu 1999 RODEO Workshop Manual page 910

Rodeo 1999
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f Diagnostic Trouble Code P0502 can be cleared by
using the Scan Tool's "Clear Info" function.
Diagnostic Aids
f Poor connection at PCM: Inspect harness connectors
for backed out terminals, improper mating, broken
Step
1
Was the "On–Board Diagnostic (OBD) System Check"
performed?
2
1. Ignition OFF.
2. Disconnect the VSS connector.
3. Using a test light to battery +, probe the connector
ground wire.
Did the light illuminate?
3
Repair the open in the sensor ground circuit.
4
1. Ignition ON, sensor disconnected.
2. Using a Digital Voltmeter (DVM), measure at the
VSS connector between ground and voltage
supply.
Was the measurement near the specified value?
5
Repair the open or short to ground in the VSS sensor
circuit.
6
1. Ignition OFF.
2. Check the BLU/BLK wire between the VSS sensor
connector and the PCM for the following conditions:
f
An open circuit
f
A short to ground
Was the faulty condition located?
7
Using a DVM, measure the resistance between the
VSS sensor body and transmission case (ground).
Is the resistance above the specified value?
8
1. Remove the VSS from the transmission case.
2. Visually inspect the VSS for damage.
Does the VSS appear to be OK?
9
Replace the VSS.
10
Replace the PCM.
IMPORTANT: The
programmed. Refer to On–Vehicle Service in
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?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0502 – VSS Circuit Low Input
Action
replacement
PCM
must
Module
and
Sensors
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
f Damaged harness: Inspect the wiring harness to the
EVAP vent solenoid, the EVAP purge solenoid, and the
fuel tank pressure sensor for an intermittent open or
intermittent short circuit.
Value(s)
Go to Step 2
Go to Step 4
Verify repair
Battery
voltage
Go to Step 6
Verify repair
Verify repair
10 K W
Verify repair
Verify repair
Verify repair
be
for
Verify repair
6E1–283
Yes
No
Go to OBD
System
Check
Go to Step 3
Go to Step 5
Go to Step 9
Go to Step 9

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