W 150 Pickup V6-239 39L ECM Low Fuel Economy Highway Speeds
Powertrain Control Module: Customer Interest
ECM - Low Fuel Economy At Highway Speeds
NO.: 18-16-91
GROUP:
DRIVEABILITY
DATE:
Nov. 18, 1991
SUBJECT:
Low Highway Fuel Economy
MODELS:
1991 (AD) RAM PICKUP
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A 3.9 LITER ENGINE AND 3-SPEED AUTOMATIC TRANSMISSION (A999).
SYMPTOM/CONDITION
Vehicles experience low fuel economy, particularly at highway speeds. This condition may be caused by the engine controller not allowing the lock-up
torque converter to engage.
DIAGNOSIS:
Inspect the SBEC (Single Board Engine Controller). If the SBEC PN is 53008929, the following repair procedure should be followed.
PARTS REQUIRED:
1
Single Board Engine Controller
53008912
REPAIR PROCEDURE:
This repair involves replacement of the engine controller.
1.
With the ignition key in the OFF position, disconnect the negative battery cable.
2.
Replace the original SBEC with the new SBEC, PN 53008912.
Figure 1
3.
Type the required information on the Authorized Modification Label, as illustrated in Figure 1, and attached near the VECI label.
POLICY:
Reimbursable within the provisions of the warranty.
