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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step checks the ISS for an output signal.
  2. 4:  This step checks the ISS sensor resistance.
  3. 5:  This step checks the wiring from the sensor to the PCM connector.
DTC P1725

Step Action Values Yes No
Schematic Reference: Automatic Transmission Controls Schematics 
1 Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2 
  1. Raise the drive wheels.
  2. Support the lower control arms so that the drive axles are in a horizontal position.
  3. Start and idle the engine.
  4. Observe the ISS parameter on the scan tool.
  5. Allow the engine to idle in gear with the drive wheels rotating.
Does the scan tool parameter indicate a vehicle speed?		 - Go to Step 3  Go to Step 4 
3
  1. Using the scan tool, store the DTC Freeze Frame information.
  2. Perform the scan tool Clear DTC Information function.
  3. Place the vehicle into Check mode using the scan tool.
  4. Operate the vehicle within the Freeze Frame conditions.
Does DTC P1725 set?		 - Go to Step 4  Go to Diagnostic Aids
4 
  1. Disconnect the ISS electrical connector.
  2. Check the resistance of the ISS sensor.
Is the resistance within the specified value?		 560 - 680 Ω at 20°C (68°F) Go to Step 5  Go to Step 7 
5 
  1. Disconnect PCM electrical connector C2.
  2. Probe the terminals 27 and 35 on the harness side with the DMM.
  3. Measure the resistance of the circuit.
Is the resistance within the specified value?		 560 - 680 Ω at 20°C (68°F) Go to Step 8  Go to Step 6 
6 Repair the open or short to ground. Refer to Wiring Repairs in Wiring Systems.
Is the action complete?		 - Go to Step 9  -
7 Replace the Input Shaft Speed (ISS) sensor.
Is the replacement complete?		 - Go to Step 9  -
8 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Is the replacement complete?		 - Go to Step 9  -
9
  1. Perform the scan tool Clear DTC Information function and road test the vehicle with the Freeze Frame conditions that set the DTC.
  2. Review the scan tool data and check for DTCs. The repair is complete if no DTCs are stored.
Are any DTCs displayed on the scan tool?		 - Go to Diagnostic Trouble Code (DTC) List/Type  System OK
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