Quad Driver Module ?
Melting Slicks
Joined: Jul 1999
Posts: 2,875
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From: Olive Branch (Memphis suburb) MS
Cruise-In II Veteran
Re: Quad Driver Module ? (vettes)
The ECM is used to control several components (canister purge solenoid, EGR solenoid, A.I.R. relay, 1-4 upshift relay, TCC apply solenoid, A/C clutch control relay, and Fans 1 & 2 relays). The ECM controls these devices through the use of a Quid-Driver Module (QDM). When the ECM is commanding a component "ON", the voltage of the output circuit should be "low"(near 0 volts). When the ECM is commanding the output circuit to a component "OFF", the voltage of the circuit should be "high"(near battey voltage). The primary function of the QDM is to supply the ground for the component being controlled. Each QDM has a fault line which is monitored by the ECM. The fault line signal status can be displayed on the Tech1. The ECM will compare the voltage at the QDM. If the QDM fault detection circuit senses a voltage other than what is expected, the fault line status will change and a code 26 or 27 will set. :crazy:
[Modified by Ramrod92, 2:48 PM 9/14/2001]
[Modified by Ramrod92, 2:48 PM 9/14/2001]
