Great Lakes 4x4. The largest offroad forum in the Midwest - View Single Post - 01 Ram idle and shift problems
View Single Post
Old January 2nd, 2008, 01:12 PM   #4
Because racecar
Tom's Avatar
Join Date: 10-13-06
Location: Mooresville, NC
Posts: 4,026
iTrader: (56)
Mentioned: 33 Post(s)

KillerB is correct, you also need to have someone with a decent scan tool to diagnose this issue. I have had similar complaints with this issue and found it to be a bad PCM ground also. There is an atsg tech bulletin for this issue.... here is some of it: The above complaints are all caused by a bad internal computer ground, this ground is shared by many components depending on model and engine application. This ground is located at the A4 terminal in the GRAY connector at the PCM. On a GASOLINE application the Governor Pressure Sensor, Battery Temp. Sensor and Oxygen Sensors share this ground as well as other engine management sensors as shown in the wire diagram in Figure 2. The Battery Temp. Sensor is used to convey battery temperature to the PCM while the PCM monitors charging system voltage, in order to control battery charging rate. The result of this data is, charging system voltage will be higher at colder temperatures, and is gradually reduced as battery temperature rises. The Battery Temp. Sensor is located under the battery in the battery tray. On diesel equipped vehicles with dual batteries, it is located in the driver’s side battery tray. This location is enough to cause problems due to corrosion. The sensor wire harness travels underneath the battery tray, (See Figure 4), to a 2 terminal connector, (See Figure 5), where the sensor resistance can be checked. Resistance values are, 9,000 (9k) to 11,000 (11k) ohms at 75ºF to 80ºF (25ºC). Battery Temp. Sensor temperature range is -40ºF to 389ºF (-40ºC to 199ºC). Battery Temp. Sensor voltage range is 0 to 5.1. The poorer the ground is, the lower the voltage indicated will be, resulting in a high temperature reading. This sensor works opposite of a normal thermister. Repair the ground or replace the sensor causing the poor ground.
Tom is offline   Reply With Quote
Page generated in 0.34301 seconds with 22 queries