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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Automatic Transaxle - 4T80-E - Service, Diagnosis & Troubleshooting) >> Range Selector Displays Incorrect Range >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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. 3:  This step tests the IMS for an open ground circuit.
  2. 5:  This step tests for correct reference voltage from the TCM.
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. 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 TCM.
  3. Record the DTC Freeze Frame and Failure Records.
  4. Clear the DTC.
  5. Select IMS on the scan tool.
  6. Place the gear select lever in each transmission range: P, R, N, D4, D3, D2, and D1.
Does each range selected match the scan tool IMS display?		 - Go to Testing for Intermittent Conditions and Poor Connections Go to Step 2 
2
  1. Select IMS A/B/C/P on the scan tool.
  2. Place the gear select lever in each transmission range: P, R, N, D4, D3, D2, and D1.
Does the IMS A/B/C/P display match the specified value for each range selected?		 HI/HI/HI/HI Go to Step 12  Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the AT 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.
Does the scan tool IMS A/B/C/P parameter indicate HI for all range signal states?		 - Go to Step 4  Go to Step 8 
4
  1. Turn OFF the ignition.
  2. Install the J 44152  Jumper Harness (20 pins) on the engine harness side of the AT inline 20-way connector. See Special Tools .
  3. Turn ON the ignition, with the engine OFF.
  4. Using the DMM and the J 35616  GM Terminal Test Kit, measure the voltage at terminal F of the J 44152  . See Special Tools .

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

  5. Measure the voltage at terminal G of the J 44152  . See Special Tools .
  6. Measure the voltage at terminal H of the J 44152  . See Special Tools .
  7. Measure the voltage at terminal J of the J 44152  . See Special Tools .
Does the voltage measure ignition voltage at all four terminals?		 - Go to Step 5  Go to Step 9 
5  Connect a fused jumper wire from terminal F of the J 44152  , signal A circuit, to ground while monitoring the scan tool IMS A/B/C/P parameter. See Special Tools .
Refer to Automatic Transmission Inline 20-Way Connector End View .
When the 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 terminal G of the J 44152  , signal B circuit, to ground while monitoring the scan tool IMS A/B/C/P parameter. See Special Tools .
Refer to Automatic Transmission Inline 20-Way Connector End View .
When the 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 terminal H of the J 44152  , signal C circuit, to ground while monitoring the scan tool IMS A/B/C/P parameter. See Special Tools .
Refer to Automatic Transmission Inline 20-Way Connector End View .
When the signal C circuit is grounded, do any other signal circuits indicate LOW?		 - Go to Step 10  Go to Step 11 
8 Test the signal circuits of the IMS that did not indicate HI for a short to ground between the TCM connector 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 
9 Test the signal circuits of the IMS that did not indicate ignition voltage for an open between the TCM connector 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 
10 Test the affected signal circuits of the IMS for a shorted together condition between the TCM connector 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 
11 Test the signal circuits of the IMS for an open or shorted condition between the AT inline 20-way connector and the IMS.
Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 14  Go to Step 15 
12 Test the ground circuit of the IMS for an open between the AT inline 20-way connector and ground.
Refer to Circuit Testing 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 AT inline 20-way connector and the IMS.
Refer to Circuit Testing .
Did you find a condition?		 - Go to Step 14  Go to Step 15 
14
IMPORTANT: The automatic transmission wiring harness consists of 2 separate harnesses, the Automatic Transmission Wiring Harness Assembly and the Automatic Transmission Wiring Extension Harness Assembly. In order to avoid the unnecessary replacement of parts, determine which harness contains the fault and replace only that harness.
Replace the automatic transmission wiring harness.Refer to Input Speed Sensor and Wiring Harness Removal .Did you complete the replacement?		 - Go to Step 17  -
15 Replace the transmission internal mode switch.
Refer to Lower Control Valve Body Assembly Disassemble .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the TCM.
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 2 
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