Test Description
WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. 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.
- 2: This step verifies the ability of the PCM to command the PC solenoid valve.
- 3: This step verifies that the automatic transmission wiring harness and the PC solenoid valve have correct resistance.
DTC P0748 (2.2L - L61)
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Engine Controls? | - | Go to Step 2 | Go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS in Self-Diagnostics - 3.0L or DIAGNOSTIC SYSTEM CHECK -- ENGINE CONTROLS in Self-Diagnostics - 2.2L |
| 2 |
|
0.16 amps | Go to Step 3 | Go to INTERMITTENTS for 2.2L or INTERMITTENT CONDITIONS for 3.0L |
| 3 |
|
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 |
|
- | Go to Step 19 | Go to Step 20 |
| 6 | Test the high control circuit (CKT 1228) and the low control circuit (CKT 1229) 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 in Wiring Systems. Did you find a condition? |
- | Go to Step 19 | Go to Step 20 |
| 7 | Measure the resistance from terminal C of the
J 44152
to ground. Refer to Automatic Transmission Inline 20-Way Connector End View (2.2L - L61) or Automatic Transmission Inline 20-Way Connector End View (3.0L - L81) Is the resistance less than the specified value? |
1,000 Ω | Go to Step 8 | Go to Step 9 |
| 8 |
|
- | Go to Step 19 | Go to Step 20 |
| 9 | Measure the resistance between terminal C and all other terminals, except terminal D, of the
J 44152
. Refer to Automatic Transmission Inline 20-Way Connector End View (2.2L - L61) or Automatic Transmission Inline 20-Way Connector End View (3.0L - L81) Is the resistance between terminal C and any other terminal, except terminal D, less than the specified value? |
10 Ω | Go to Step 19 | Go to Step 10 |
| 10 |
|
10 Ω | Go to Step 11 | Go to Step 12 |
| 11 | Test the low control circuit (CKT 1229) of the PC solenoid valve for a short to ground between the PCM connector C2 and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. 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 between terminal D of the
J 44152
and terminal 9 of the PCM connector C2. Refer to Automatic Transmission Inline 20-Way Connector End View (2.2L - L61) or Automatic Transmission Inline 20-Way Connector End View (3.0L - L81) Is the resistance less than the specified value? |
10 Ω | Go to Step 14 | Go to Step 13 |
| 13 | Test the low control circuit (CKT 1229) of the PC solenoid valve for an open between the PCM connector C2 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 22 | - |
| 14 | Using the DMM and the J-35616
connector test adapter kit, measure the resistance from terminal C of the
J 44152
to a good ground. Refer to Automatic Transmission Inline 20-Way Connector End View (2.2L - L61) or Automatic Transmission Inline 20-Way Connector End View (3.0L - L81) Is the resistance less than the specified value? |
10 Ω | Go to Step 15 | Go to Step 16 |
| 15 | Test the high control circuit (CKT 1228) of the PC solenoid valve for a short to ground between the PCM connector C2 and the AT inline 20-way connector. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. 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 between terminal C of the
J 44152
and terminal 6 of the PCM connector C2. Refer to Automatic Transmission Inline 20-Way Connector End View (2.2L - L61) or Automatic Transmission Inline 20-Way Connector End View (3.0L - L81) Is the resistance less than the specified value? |
10 Ω | Go to Step 17 | Go to Step 18 |
| 17 | Test the high control circuit (CKT 1228) and the low control circuit (CKT 1229) of the PC solenoid for a short to voltage. Refer to Testing for a Short to Voltage and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 22 | Go to Step 21 |
| 18 | Test the high control circuit (CKT 1228) of the PC solenoid valve for an open between the PCM connector C2 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 22 | - |
| 19 | Replace the automatic transmission wiring harness. Refer to WIRING HARNESS REMOVAL and WIRING HARNESS CONNECTION . 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 PCM. Refer to POWERTRAIN CONTROL MODULE in Removal & Installation. Did you complete the replacement? |
- | Go to Step 22 | - |
| 22 | Perform the following procedure in order to verify the repair:
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 TESTS in Self-Diagnostics - 2.2L or DIAGNOSTIC TESTS in Self-Diagnostics - 3.0L | System OK |