Test Description

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

3: This step determines if the fault is internal or external to the transmission.
4: This step determines if the engine wiring harness circuit is at fault or the TCM.
5: This step determines if the automatic transmission wiring harness or transmission manual shift shaft switch assembly is at fault.

DTC P1822

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Install a scan tool. Turn ON the ignition, with the engine OFF. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM. Using the Clear Info function erases stored DTCs in both the ECM and TCM. Record the DTC Freeze Frame and Failure Records. Clear the DTC. Select Transmission Data on the scan tool. Select IMS range on the scan tool. Place the gear select lever in D. Does the scan tool IMS range display Drive?	-	Go to Intermittent Conditions in Engine Controls - 3.6L or Intermittent Conditions in Engine Controls - 4.6L	Go to Step 3
3	Turn OFF the ignition. Disconnect the AT inline 20-way connector. Additional DTCs may set. Install the J 45681 jumper harness on the TCM side of the AT inline 20-way connector. See Special Tools . Using the J 35616 GM terminal test kit, connect a fused jumper wire from the TR signal B circuit of the J 45681 to ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View (5L40-E) or Automatic Transmission Inline 20-Way Connector End View (5L50-E) . Turn ON the ignition, with the engine OFF. Select IMS A/B/C/P on the scan tool. Is IMS Signal B displaying LOW?	-	Go to Step 5	Go to Step 4
4	Test the TR signal B circuit of the switch for an open between the TCM connector and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 9	Go to Step 8
5	Test the TR signal B circuit of the switch for an open between the AT inline 20-way connector and the transmission manual shift shaft switch assembly. Refer to Testing for Continuity in Wiring Systems. Did you find the condition?	-	Go to Step 6	Go to Step 7
6	Replace the automatic transmission wiring harness. Refer to Transmission Internal Electrical Harness Replacement . Is the action complete?	-	Go to Step 9	-
7	Replace the transmission manual shift shaft switch assembly. Refer to Manual Shaft Shift Position Switch Replacement . Is the action complete?	-	Go to Step 9	-
8	Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Is the action complete?	-	Go to Step 9	-
9	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Operate the vehicle under the following conditions: Drive the vehicle in D. The engine torque is greater than 55 N.m (41 lb ft). IMS Signal B must be LOW for 0.025 second. Select Specific DTC. Enter DTC P1822. Has the test run and passed?	-	Go to Step 10	Go to Step 2
10	With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed?	-	Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information	System OK