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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1442 (Engine Control System - Diagnosis - 4.2L (DTC P0507 To DTC P2176)) >> Diagnosis Information & Procedures >> DTC P1680 >> Test Description

Test Description

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

  1. 2:  A DTC P0602 indicates that the PCM is not programmed.
  1. 5:  Resistance is measured at the pedal assembly because a pedal resistance that is lower than the specified value will set this DTC
DTC P1680

Step Action Values Yes No
1 Did you perform the Diagnostic System Check-Engine Controls? - Go to Step 2  Go to Diagnostic System Check - Engine Controls
2  Is DTC P0602 set? - Go to Step 3  Go to Step 5 
3 Program the powertrain control module (PCM). Refer to Service Programming System (SPS) in Programming.
Does DTC P0602 reset?		 - Go to Step 4  Go to Step 8 
4
  1. Ensure that all tool connections are secure.
  2. Ensure that the programming equipment is operating correctly.
  3. Ensure that the correct software/calibration package is used.
  4. Attempt to program the PCM. Refer to Service Programming System (SPS) in Programming.
Does DTC P0602 reset?		 - Go to Step 7  Go to Step 8 
5 
  1. Turn OFF the ignition.
  2. Disconnect the accelerator pedal connector
  3. Ensure that the pedal is at the rest position.
  4. Measure the resistance from the 5-volt reference of the accelerator pedal assembly to the accelerator pedal position (APP) sensor 2 signal of the accelerator pedal assembly with a DMM. Refer to Circuit Testing in Wiring Systems.
Is the resistance less than the specified value?		 450 Ohms Go to Step 6  Go to Step 7 
6 Replace the accelerator pedal assembly. Refer to Accelerator Pedal Position (APP) Sensor Replacement .
Did you complete the replacement?		 - Go to Step 8  -
7 Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement .
Did you complete the replacement?		 - Go to Step 8  -
8
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 9 
9 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List System OK
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