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Test Description

WARNING: This page is about a different variant/trim than selected.

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

  1. 2:  This step verifies the ability of the TCM to command the PC solenoid valve.
  2. 3:  This step verifies that the automatic transmission wiring harness and the PC solenoid valve have correct resistance.
DTC P0748

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
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
    3. IMPORTANT: Before clearing the DTC, use the scan tool in order to record the Failure Records. Using the Clear Info function erases the Failure Records from the TCM.
  3. Record the DTC Failure Records.
  4. Clear the DTC.
  5. Start the engine.
  6. Using the scan tool, apply 0.1 amps through 1.0 amps.
  7. Observe the scan tool display.
Does the PC Sol. Actual Current differ from the PC Sol. Ref. Current by more than the specified amount?		 0.16 amps Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections
3 
  1. Turn OFF the ignition.
  2. Disconnect the AT inline 20-way connector. Additional DTCs may set.
  3. Install the J 44152  jumper harness (20 pins) on the transmission side of the AT inline 20-way connector. See Special Tools .
  4. Using the DMM and the J-35616  connector test adapter kit, measure the resistance between the PC solenoid valve high control and the PC solenoid valve low control circuits of the J 44152  . See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance within the specified range?		 3-7 Ω Go to Step 7  Go to Step 4 
4 Is the resistance greater than the specified value? 7 Ω Go to Step 5  Go to Step 6 
5
  1. Test the high control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve.
  2. Test the low control circuit of the PC solenoid valve for an open between the AT inline 20-way connector and the PC solenoid valve.
Refer to Testing for Continuity .Did you find a condition?		 - Go to Step 19  Go to Step 20 
6 Test the high control circuit and the low control circuit of the PC solenoid valve for being shorted together between the AT inline 20-way connector and the PC solenoid valve. Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 19  Go to Step 20 
7 Measure the resistance from the PC solenoid valve high control circuit of theJ 44152  to ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 1,000 Ω Go to Step 8  Go to Step 9 
8
  1. Test the high control circuit of the PC solenoid valve for a short to ground between the AT inline 20-way connector and the PC solenoid valve.
  2. Test the low control circuit of the PC solenoid valve for a short to ground between the AT inline 20-way connector and the PC solenoid valve.
Refer to Testing for Short to Ground .Did you find a condition?		 - Go to Step 19  Go to Step 20 
9 Measure the resistance between the PC solenoid valve high control circuit and all other terminals, except the PC solenoid valve low control circuit, of the J 44152  . See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 10 Ω Go to Step 19  Go to Step 10 
10
  1. Disconnect the J 44152  from the transmission side of the AT inline 20-way connector. See Special Tools .
  2. Install the J 44152  on the engine side of the AT inline 20-way connector. See Special Tools .
  3. Disconnect TCM connector C1. Additional DTCs may set.
  4. Using the DMM and the J-35616  connector test adapter kit, measure the resistance from the PC solenoid valve low control circuit of the J 44152  to ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 10 Ω Go to Step 11  Go to Step 12 
11 Test the low control circuit of the PC solenoid valve for a short to ground between the TCM connector C1 and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  -
12 Using the DMM and the J-35616  connector test adapter kit, measure the resistance of the PC solenoid valve low control circuit between the J 44152  and the TCM connector C1. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 10 Ω Go to Step 14  Go to Step 13 
13 Test the low control circuit of the PC solenoid valve for an open between the TCM connector C1 and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  -
14 Using the DMM and the J-35616  connector test adapter kit, measure the resistance from the PC solenoid valve high control circuit of the J 44152  to a good ground. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 10 Ω Go to Step 15  Go to Step 16 
15 Test the high control circuit of the PC solenoid valve for a short to ground between the TCM connector C1 and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  -
16 Using the DMM and the J-35616  connector test adapter kit, measure the resistance of the PC solenoid valve high control circuit between the J 44152  and the TCM connector C1. See Special Tools . Refer to Automatic Transmission Inline 20-Way Connector End View .
Is the resistance less than the specified value?		 10 Ω Go to Step 17  Go to Step 18 
17 Test the high control circuit and the low control circuit of the PC solenoid for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  Go to Step 21 
18 Test the high control circuit of the PC solenoid valve for an open between the TCM connector C1 and the AT inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 22  -
19 Replace the automatic transmission wiring harness. Refer to Wiring Harness Replacement .
Did you complete the replacement?		 - Go to Step 22  -
20 Replace the PC solenoid valve. Refer to Pressure Control Solenoid (PCS) Replacement .
Did you complete the replacement?		 - Go to Step 22  -
21 Replace the TCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 22  -
22 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Turn ON the ignition, with the engine OFF.
  4. Select Specific DTC.
  5. Enter DTC P0748.

Has the test run and passed?		 - Go to Step 23  Go to Step 2 
23 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 System OK
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