LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1508 (Automatic Transmission, 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P2761)) >> Diagnosis >> DTC P0740 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. 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.

  1. 4:  This step tests for voltage to the solenoid.
  2. 5:  This step tests the ability of the PCM and wiring to control the ground circuit.
  3. 7:  This step tests the resistance of the TCC solenoid valve and the automatic transmission (AT) wiring harness assembly.
DTC P0740

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 Engine Controls
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 Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
Are any of the following DTCs also set?
  • P0753
  • P0758
  • P0785
  • P2761
 - Go to Step 3  Go to Step 4 
3 Inspect the ENG IGN 1 fuse for an open.
Refer to Circuit Protection - Fuses in Wiring Systems.
Is the fuse open?		 - Go to Step 9  Go to Step 4 
4 
  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 engine side of the AT inline 20-way connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Using the J 35616  GM Terminal Test Kit, connect a test lamp from terminal E of the J 44152  to ground.

    Refer to Automatic Transmission Inline 20-Way Connector End View .

Does the test lamp illuminate?		 - Go to Step 5  Go to Step 12 
5 
  1. Connect the test lamp from terminal E to terminal T of the J 44152  .

    Refer to Automatic Transmission Inline 20-Way Connector End View .

  2. Use the scan tool in order to command the TCC solenoid valve ON and OFF three times.
Does the test lamp turn ON and OFF with each command?		 - Go to Step 7  Go to Step 6 
6 Is the test lamp always ON? - Go to Step 13  Go to Step 14 
7 
  1. Install the J 44152  on the transmission side of the AT inline 20-way connector.
  2. Using the DMM and the J 35616  , measure the resistance between terminals T and E of the J 44152  .

    Refer to Automatic Transmission Inline 20-Way Connector End View .

Does the resistance measure within the specified range?		 21-33 Ω Go to Step 8  Go to Step 15 
8
  1. Measure the resistance from terminal E of the J 44152  to ground.
  2. Measure the resistance from terminal T of the J 44152  to ground.
Do both readings measure greater than the specified value?		 250 K Ω Go to Intermittent Conditions in Engine Controls Go to Step 15 
9
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.
Test the ignition circuit of the TCC solenoid valve for a short to ground between the underhood electrical center 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 17  Go to Step 10 
10
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.
Test the ignition circuit of the TCC solenoid valve for a short to ground between the AT inline 20-way connector and the TCC solenoid valve.Refer to Testing for Short to Ground in Wiring Systems.Did you find a short to ground condition?		 - Go to Step 15  Go to Step 11 
11
  1. Test each solenoid for a short to ground.
  2. Replace the faulty solenoid as necessary.
Did you complete the replacement?		 - Go to Step 17  -
12
IMPORTANT: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems for complete circuit distribution.
Test the ignition circuit of the TCC solenoid valve for an open.Refer to Testing for Continuity and Wiring Repairs in Wiring Systems.Did you find and correct the condition?		 - Go to Step 17  -
13 Test the solenoid control circuit of the TCC 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 17  Go to Step 16 
14 Test the solenoid control circuit of the TCC solenoid valve for an open or short to power between the PCM connector C2 and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
15 Replace the AT wiring harness assembly, this includes the TCC solenoid valve.
Refer to Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid, TCC Solenoid, and Wiring Harness .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the PCM.
Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.
Did you complete the replacement?		 - Go to Step 17  -
17 Perform the following procedure in order to verify the repair:
  1. Select DTC.
  2. Select Clear Info.
  3. Drive the vehicle in D4 with the TCC commanded ON for 5 seconds and commanded OFF for 5 seconds.
  4. Select Specific DTC.
  5. Enter DTC P0740.

Has the test run and passed?		 - Go to Step 18  Go to Step 2 
18 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 in Engine Controls System OK
scientia non olet · About LEMON Manuals