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P1640 QDm-1 - 1994 Pontiac Trans Sport

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1999 cadillac deville purge selinoid . we're is it P1640?


My info said, you have to remove intake manifold site shield. The picture location I had was no good, no orientation.
I found this picture, if we're talking about the same thing?
26218033-11axjwgnmvqcevl5lnqydayy-1-0.jpg

Jun 13, 2016 | Cadillac Cars & Trucks

1 Answer

It's a 1995 Saturn sl the clutch on ac compressor kicks on with direct power the engine fan also changed relays still get the code 26 quad drive modal need some help


This info is from 1998 Saturn Sl , my service info doesn't go to 95 . It's the same except for code numbers , My info is P0xxx #'s . The quad driver is part of the ECM - engine computer !
Here is a description from Saturn service info .
A quad driver module (QDM) is an electronic switch which completes a ground circuit when switching ON. The QDM independently controls 4 separate outputs. A load is connected between battery voltage and the QDM allowing the QDM driver to control the output. Each QDM has fault detection logic which compares QDM driver input and output voltages. The logic expects to measure less than 3 volts when the QDM driver is ON and greater than 7 volts when OFF. The QDM has only one fault line that will detect a fault on any of the 4 outputs. The scan tool can be used to cycle the outputs ON or OFF. The scan tool can also perform an automated test which can isolate the faulty circuit.
The quad drive it self may be bad , GM had a problem with these !
Did you check fuse's ?
Conditions for Setting the DTC
DTC P01650 and/or P1651 will set if:
?€¢
There is an open, short to ground or short to voltage on any of the QDM output circuits


?€¢
MIL (SERVICE ENGINE SOON) telltale circuit


?€¢
Upshift lamp circuit


?€¢
Cooling fan relay circuit


?€¢
A/C relay circuit


?€¢
Fault detected for 5 seconds for DTC P1651. Fault detected for 20 seconds for DTC P1650.

Important: The QDM circuit is continuously checked when the engine is running.

May 18, 2015 | 1995 Saturn Sl

1 Answer

Code 26 what does it mean


DTC 26 refers to a quad driver module fault. The quad driver is a "safety valve" for the ECM controlled circuits. The quad driver controls up to 4 circuits. There are multiple quad drivers in the ECM. The QDM shuts down a shorted circuit to prevent high current flow from damaging the ECM.
So the DTC 26 will isolate the problem to 1 QDM. You will need a repair manual with electrical diagrams and DTC flow charts to determine which of the circuits controlled by that QDM are failing. Usually DTC 26 refers to the Torque Converter Clutch solenoid and related circuit.
Most likely you have a shorted TCC solenoid or the harness connected to it, The solenoid is internal in the transmission accessible from the side cover.

I will assume this is a 3800 V6 w/ 4T440 / 440 T4 transmission with the digital (3 solenoid valves) EGR valve.
Keep in mind the single most cause for any code will be a power or ground problem. Clean all the battery cables, and any and all cables or wires that attach from the engine to the firewall. Many problems can be resolved by just doing this. Many times a computer will give false codes when it doesn't get the correct amount of voltage, or a good ground is not established between the battery, engine, and the body of the vehicle.
Glad to help out, Good Luck!!!

Oct 28, 2009 | 1989 Pontiac Bonneville

1 Answer

I have two codes on my 1995 oldsmobile eighty-Eight P1640 P1670 what do they mean.


P1640 Driver 1-Input High Voltage
P1670 Driver 4
have a look here for more codes and info......if this helps, would you leave feedback for me please....thanx
http://www.engine-light-help.com/oldsmobile-check-engine-light.html

Sep 16, 2009 | 1995 Oldsmobile Eighty Eight

1 Answer

Codes 1640 1641 1650 1651


P1640 Driver 1-Input High Voltage

P1641 FC Relay 1 Control Circuit

P1650 Driver 2-Input High Voltage

P1651 Fan 1 Relay Control Circuit

Feb 09, 2009 | 1997 Saturn SL

1 Answer

Check engine light on code P1640


it means driver 1 input high hope this helps

Oct 19, 2008 | 1995 Oldsmobile 88

1 Answer

Does not accelerate


Newer cars are controled by the computer, only dealer can adjust it, usually the small garage can not handle the computer setting.

Jul 26, 2008 | 1994 Chevrolet Lumina APV

1 Answer

Qdm 26 cooling fans come on and stay on and voltage drops


QDM stands for Quad Driver Module.The QDM is located inside the PCM (Powertrain Control Module),or the vehicle's computer.Think of a circuit breaker,like the electrical breaker box in your home.If a circuit,any circuit becomes overloaded,the breaker "clicks" and shuts off power to the circuit.It resets itself after the load is gone,or the key has been cycled.I have never seen an actual QDM go bad.To repair this problem,the coolant temp sensor will need to be checked for proper operation.This is done with a scan tool that can access data.If the PCM is seeing a proper reading from the temp sensor,then it's on to another area,possibly the fan relays.If the relay is bad,it can melt internally and either shut off voltage,or allow continuos voltage.Check the relays.The wiring to and from the fan is also another area to be checked,but check the simple stuff first.Other than those areas,PCM command would need to be monitored.Good luck.

Jul 18, 2008 | Pontiac Firebird Cars & Trucks

2 Answers

Does not accelerate


These are quad driver codes.... The drivers are part of the computer and it is rare for the computer to blame itself... Have the system checked again for stored codes and diagnose the system indicated properly by who ever you feel most comfortable with.

May 15, 2008 | 1994 Oldsmobile Silhouette

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