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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting) >> Range Selector Displays Incorrect Range >> Test Description

Test Description

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

  1. 4:  By disconnecting the TR switch, the ground path of all TR switch circuits is removed and the TCM should recognize all circuits as open. The scan tool should display HI for all range signal states.
  2. 5:  This step tests the TR switch wiring for an open or the lack of the signal voltage from the TCM.
  3. 6:  This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
  4. 7:  This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
  5. 8:  This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
  6. 9:  This step tests the TR switch wiring and the TCM by providing a ground path through a fused jumper wire. When grounded, the scan tool range signal states should change to LOW.
Range Selector Displays Incorrect Range

Step Action Values Yes No
1
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select TR Sw. on the scan tool.
  4. With the scan tool, observe the TR Sw. display while selecting each transmission range: P, R, N, D4, D3, D2 and D1.
Does each selected transmission range match the scan tool TR Sw. display?		 - Go to Step 2  Go to Step 3 
2 Observe the IPC gear range display while selecting each transmission range: P, R, N, D4, D3, D2, D1.
Does each selected transmission range match the IPC display?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 16 
3 With the scan tool, observe the TR Sw. A/B/C/P display.
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states?		 - Go to Step 13  Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the TR switch 4-way connector.
  3. Turn ON the ignition, with the engine OFF.
Does the scan tool TR Sw. A/B/C/P parameter indicate HI for all range signal states?		 - Go to Step 5  Go to Step 10 
5 
  1. Using the DMM and the J 35616  GM Terminal Test Kit, measure the voltage from the transmission range signal A circuit of the TR switch connector to ground.
  2. Measure the voltage from the transmission range signal B circuit of the TR switch connector to ground.
  3. Measure the voltage from the transmission range signal C circuit of the TR switch connector to ground.
  4. Measure the voltage from the transmission range signal P circuit of the TR switch connector to ground.
Does the voltage measure within the specified range at all 4 circuits?		 10-12 V Go to Step 6  Go to Step 11 
6  Connect a fused jumper wire from the TR switch connector, signal circuit A, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When signal circuit A is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 7 
7  Connect a fused jumper wire from the TR switch connector, signal circuit B, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When signal circuit B is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 8 
8  Connect a fused jumper wire from the TR switch connector, signal circuit C, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When signal circuit C is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 9 
9  Connect a fused jumper wire from the TR switch connector, signal circuit P, to ground while monitoring the scan tool TR Sw. A/B/C/P parameter.
When signal circuit P is grounded, do any other signal circuits indicate LOW?		 - Go to Step 12  Go to Step 13 
10 Test the signal circuits of the TR switch that did not indicate HI for a short to ground.
Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
11 Test the signal circuits of the TR switch that did not indicate proper voltage for an open.
Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
12 Test the affected signal circuits of the TR switch for a shorted together condition.
Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
13 Test the ground circuit of the TR switch for an open.
Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 14 
14 Replace the TR switch, this switch is part of the park/neutral position switch.
Refer to Park/Neutral Position Switch Replacement .
Did you complete the replacement?		 - Go to Step 17  -
15 Replace the TCM.
Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the IPC.
Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  Go to Step 2 
17
  1. Turn ON the ignition, with the engine OFF.
  2. With the scan tool, observe the TR Sw. display while selecting each transmission range: P, R, N, D4, D3, D2 and D1.
Does each selected transmission range match the scan tool TR Sw. display?		 - System OK Go to Step 2 
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