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Home >> Chevrolet >> 2011 >> Impala LS, 3.9 M >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission - 4T65-E - Symptom Troubleshooting & Diagnosis) >> Range Selector Displays Incorrect Range >> 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. 2:  HI values for all signals in all ranges indicates the ground circuit is OPEN.
  2. 3:  With the 20-way connector disconnected, all signals should indicate HI.
  3. 5:  If one circuit affects the other, this indicates a short between the 2 circuits.
  4. 11:  This step tests the internal transmission harness. If no fault is found in the harness, the fault is in the switch.
Step Action Value Yes No
1
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select IMS on the scan tool.
  4. Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does each range selected match the scan tool IMS display?		 - Go to Diagnostic System Check - Vehicle Go to Step 2 
2 
  1. Select IMS A/B/C/P on the scan tool.
  2. Place the range selector in each transmission range: P, R, N, D4, D3, D2 and D1.
Does the IMS A/B/C/P display the specified values for each range?		 HI/HI/HI/HI Go to Step 12  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the automatic transmission inline 20-way connector. Additional DTCs may set.
  3. Turn ON the ignition, with the engine OFF.
  4. Select IMS A/B/C/P on the scan tool.
Do the scan tool IMS A/B/C/P signals all indicate HI?		 - Go to Step 4  Go to Step 8 
4
  1. Turn OFF the ignition.
  2. Install the J 44152  jumper harness on the engine side of the automatic transmission inline 20-way connector. See Special Tools .
  3. Turn ON the ignition, with the engine OFF.
  4. Using the J 39200  DMM and the J 35616  GM terminal test kit, measure the voltage at the TR signal A circuit of the J 44152  . Refer to Inline Harness Connector End Views . See Special Tools .
  5. Measure the voltage at the TR signal B circuit of the J 44152  . See Special Tools .
  6. Measure the voltage at the TR signal C circuit of the J 44152  . See Special Tools .
  7. Measure the voltage at the TR signal P circuit of the J 44152  . See Special Tools .
Does the voltage measure ignition voltage at all 4 terminals?		 - Go to Step 5  Go to Step 9 
5  Connect a fused jumper wire from the TR signal A circuit of the J 44152  to ground while monitoring the scan tool IMS A/B/C/P parameter. Refer to Inline Harness Connector End Views . See Special Tools .
When the TR signal A circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 10  Go to Step 6 
6 Connect a fused jumper wire from the TR signal B circuit of the J 44152  to ground while monitoring the scan tool IMS A/B/C/P parameter. Refer to Inline Harness Connector End Views . See Special Tools .
When the TR signal B circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 10  Go to Step 7 
7 Connect a fused jumper wire from the TR signal C circuit of the J 44152  to ground while monitoring the scan tool IMS A/B/C/P parameter. Refer to Inline Harness Connector End Views . See Special Tools .
When the TR signal C circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 10  Go to Step 11 
8 Test the TR signal circuits of the IMS that did not indicate HI for a short to ground between the PCM and the automatic transmission 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 
9 Test the TR signal circuits of the IMS that did not indicate ignition voltage for an open between the PCM and the automatic transmission inline 20-way connector. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
10 Test the affected TR signal circuits of the IMS for a shorted together condition between the PCM and the automatic transmission 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 
11  Test the TR signal circuits of the IMS for an open or shorted condition between the automatic transmission inline 20-way connector and the IMS. Refer to Circuit Testing .
Did you find the condition?		 - Go to Step 14  Go to Step 15 
12 Test the ground circuit of the IMS for an open between the automatic transmission inline 20-way connector and the ground connection to the chassis. Refer to Testing for Continuity and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 13 
13 Test the ground circuit of the IMS for an open between the automatic transmission inline 20-way connector and the IMS. Refer to Testing for Continuity .
Did you find the condition?		 - Go to Step 14  Go to Step 15 
14 Replace the automatic transmission wiring harness assembly. Refer to Wiring Harness Replacement .
Did you complete the replacement?		 - Go to Step 17  -
15 Replace the lever assembly manual shaft detent with internal mode switch. Refer to Manual Shift Detent Lever with Shaft Position Switch Assembly Removal .
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
  1. Turn ON the ignition, with the engine OFF.
  2. With the scan tool, observe the IMS display while selecting each transmission range: P, R, N, D4, D3, D2, and D1.
Does each selected transmission range match the scan tool IMS display?		 - System OK Go to Step 1 
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