Diagnostic Trouble Code (Dtc) P1650 Quad Driver Module "A" Fault - Isuzu 1999 RODEO Workshop Manual

Diagnostic Trouble Code (DTC) P1650 Quad Driver Module "A" Fault

Circuit Description
The Quad Driver Module (QDMs) are used by the
powertrain control module (PCM) to turn "ON"
current–driven devices that are needed to control two
engine functions. The PCM monitors open or short circuit
of either of Canister Control Purge (CCP) Vent solenoid or
Variable Intake Manifold (VIM).
Conditions for Setting the DTC
f Ignition "ON".
f Engine running.
f No DTC 1618.
f Ignition voltage.
f Output voltage does not equal voltage is not less than
1 volt when out put is "ON".
f Above conditions occur for at least 0.5 second.
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 The PCM will turn the MIL "OFF" on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.
f A history DTC P1650 will clear after 40 consecutive
warm-up cycles have occurred 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 sensor. An open ignition feed
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.
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
The following PCM pins are controlled by
quad driver modules (QDMs):
f C11 – Variable Intake Manifold
f C13 – Canister Cut Valve
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.
6E2–415