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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0785) >> DTC P0740 >> Test Description

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. 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 Values 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 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 IGN 0 fuse for an open.
Refer to Circuit Protection - Fuses .
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. See Special Tools .
  4. Turn ON the ignition, with the engine OFF.
  5. Using the J 35616  GM Terminal Test Kit, connect a test lamp from the ignition voltage circuit of the J 44152  to ground. See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View (M30/M32) or Automatic Transmission Inline 20-Way Connector End View (M33 Only) .

Does the test lamp illuminate?		 - Go to Step 5  Go to Step 12 
5
  1. Connect the test lamp from the ignition voltage and the TCC solenoid valve control circuit of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View (M30/M32) or Automatic Transmission Inline 20-Way Connector End View (M33 Only) .

  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. See Special Tools .
  2. Using the DMM and the J 35616  , measure the resistance between the ignition voltage and the TCC solenoid valve control circuit of the J 44152  . See Special Tools .

    Refer to Automatic Transmission Inline 20-Way Connector End View (M30/M32) or Automatic Transmission Inline 20-Way Connector End View (M33 Only) .

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 the ignition voltage circuit of the J 44152  to ground. See Special Tools .
  2. Measure the resistance from the TCC solenoid valve control circuit of the J 44152  to ground. See Special Tools .
Do both readings measure greater than the specified value?		 250 K Ω Go to Testing for Intermittent Conditions and Poor Connections 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 for complete circuit distribution.
Test the ignition voltage circuit of the TCC solenoid valve for a short to ground between the fuse block 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 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 for complete circuit distribution.
Test the ignition voltage 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 .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 for complete circuit distribution.
Test the ignition voltage circuit of the TCC solenoid valve for an open.Refer to Testing for Continuity and Wiring Repairs .Did you find and correct the condition?		 - Go to Step 17  -
13 Test the control circuit of the TCC solenoid valve for a short to ground between the PCM 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 17  Go to Step 16 
14 Test the control circuit of the TCC solenoid valve for an open or short to voltage between the PCM and the AT inline 20-way connector.
Refer to Circuit Testing and Wiring Repairs .
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 Valve Body and Pressure Switch Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the PCM.
Refer to Control Module References .
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 ON and OFF. Ensure that the following conditions are met:
    • The PCM commands the TCC solenoid valve ON, and the voltage feedback drops to zero.
    • The PCM commands the TCC solenoid valve OFF, and the voltage feedback increases to B+.
    • All conditions met 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 - Vehicle System OK
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