Diagnostic Trouble Code (Dtc) P1640 Output Driver Module (Odm) "A" Fault - Isuzu 1999 RODEO Workshop Manual

Diagnostic Trouble Code (DTC) P1640 Output Driver Module (ODM) "A" Fault

Action Taken When the DTC Sets
f The PCM will not illuminate the malfunction indicator
lamp (MIL).
f The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
f A history DTC P1640 will clear after 40 consecutive
warm-up cycles occur without a fault.
f DTC P1650 can be cleared by using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
f Poor connection at PCM – Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
f Damaged harness – Inspect the wiring harness for
damage, If the harness appears to be OK, disconnect
the PCM, turn the ignition "ON" and observe a
voltmeter connected to the suspect driver circuit at the
PCM harness connector while moving connectors and
wiring harnesses relates to the MIL. A change in
voltage will indicate the location of the fault.
f Poor connection at component – Examine for
damaged connectors, unplugged connector, or
damaged terminals at the following locations: canister
purge solenoid, Fuel level check. An open ignition feed
DTC P1640 –Output Driver Module (ODM) "A" Fault
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Check the fuse for the driver circuit that was shown as
faulty.
Was the fuse blown?
3 1. Check for a short to ground between the fuse and
the affected component.
2. Replace the fuse after making any necessary
repairs.
Is the action complete?
4 1. Disconnect the PCM connector for the affected
driver circuit.
Is there any damage to the PCM pin or connector?
5 Repair the damaged pin or terminal.
Is the action complete?
6 Were either of the lamp circuits for "Check Engine" or
"Check Trans." indicated as faulty by the Tech 2?
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Action
circuit at any of these components will cause DTC
P1650 to be set.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
The following PCM pins are controlled by
output driver modules (ODMs):
f A13 – MIL (Check Engine)
f A14 – Check T/M or Up-Shift
f A15 – EVAP Canister Purge
f A16 – Band Apply (4L30E)
f B14 – A/C Clutch
f B15 – Low Fuel Lamp
f B16 – CCP Solenoid and VIM
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
4. The Tech 2 Driver Module Status indicates the PCM
pin that is affected.
9. The Tech 2 may indicate "short circuit" even when
the problem is an open circuit. The cause of an
open circuit may be in the component itself.
11.A short to ground on the ignition side of the
component will blow the fuse. Since the fuse was
checked in Step 2, a short to ground would be
between the affected component and the PCM.
Value(s)
— Go to Step 2
— Go to Step 3
— Verify repair
— Go to Step 5
— Verify repair
— Go to Step 7
6E2–413
Yes No
Go to OBD
System
Check
Go to Step 4
—
Go to Step 6
—
Go to Step 13