Workshop Manual

6E–504
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1650 – Quad Driver Module (QDM) Fault
Step Action Value(s) Yes No
1 Was the “On-Board Diagnostic (OBD) System Check”
performed?
— Go to Step 2
Go to OBD
System
Check
2 Check the fuse for the driver circuit that was shown as
faulty.
Was the fuse blown?
— Go to Step 3 Go to Step 4
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?
— Verify repair —
4 Disconnect the PCM connector for the affected driver
circuit.
Is there any damage to the PCM pin or connector?
— Go to Step 5 Go to Step 6
5 Repair the damaged pin or terminal.
Is the action complete?
— Verify repair —
6 Were either of the lamp circuits for “Check Engine” or
“Check Trans”. indicated as faulty by the Tech 2?
— Go to Step 7 Go to Step 13
7 1. Leave the PCM connector for the lamp driver circuit
disconnected.
2. Ignition “ON”.
3. Using a DVM, check the voltage at the PCM
connector for the affected lamp driver circuit.
Was the voltage equal to the specified value?
B+ Go to Step 15 Go to Step 8
8 1. Ignition “ON”.
2. Check for battery voltage at the fuse for the affected
lamp circuit.
Was battery voltage available at the fuse?
— Go to Step 10 Go to Step 9
9 Repair the open circuit between the ignition switch and
the fuse.
Is the action complete?
— Verify repair —
10 1. Ignition “OFF”.
2. Disconnect the PCM connector for the affected
driver terminal.
3. Connect an ohmmeter between a good ground and
the PCM connector for the affected driver.
Did the ohmmeter indicate continuity?
— Go to Step 11 Go to Step 12
11 Repair the short to ground between the affected
component and its PCM driver terminal.
Is the action complete?
— Verify repair —
12 Repair the open circuit between the fuse and the PCM
driver terminal for the affected circuit.
Is the action complete?
— Verify repair —