Test NTC-2B - Checking Overdrive Circuit
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1995 Jeep Grand Cherokee, 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For connector terminal identification, refer to CONNECTOR IDENTIFICATION
. For appropriate wiring diagram, refer to WIRING DIAGRAMS
. After each repair, perform VERIFICATION TEST VER-1A
.
- Using scan tool, ensure transmission temperature is between 69°F (21°C) and 275°F (135°C), replace transmission temperature sensor and test vehicle for overdrive operation.
- If transmission temperature is between 69°F (21°C) and 275°F (135°C), ensure throttle lever is fully closed and against idle speed screw. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is not .89-1.20 volts, adjust or replace TP sensor. Retest vehicle for overdrive operation.
- If TP sensor voltage is .89-1.20 volts, read overdrive switch state using scan tool. Turn overdrive switch on and off while observing scan tool display. If overdrive switch state changes between 4 ALLOW and 3 SPD, repair transmission as necessary. If overdrive switch state does not change between 4 ALLOW and 3 SPD, go to next step.
- Turn ignition off. Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance at terminal No. 10 on PCM connector. Turn overdrive switch on and off while observing scan tool display. If display changes from less than 5 ohms to more than 5 ohms, replace PCM. If display does not change from less than 5 ohms to more than 5 ohms, go to next step.
- Disconnect overdrive switch harness connector. Check resistance at terminal No. 10 at PCM connector. If resistance is more than 5 ohms, replace overdrive switch. If resistance is 5 ohms or less, repair overdrive switch sense circuit for short to ground.