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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 6 (ENGINE CONTROL SYSTEM - 4.2L - DTC P0420 TO P1682)DTC P0506TEST DESCRIPTION
2006 Isuzu Ascender S, 5.3 M, 4WD

Test Description

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Test Description
WARNING: This page is about a different variant/trim than selected.

The number below refers to the step number on the diagnostic table.

  1. 2:  This test determines whether the engine can achieve the commanded RPM. If the engine does not reach the commanded RPMs, the test determines whether the RPM is too high or too low.
DTC P0506

Step Action Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module (PCM) Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2 
  1. Start the engine.
  2. Command the engine speed up to 1,500 RPM, down to 500 RPM, and up to 1,500 RPM, with a scan tool.
  3. Exit the RPM control function.
Does the engine speed correspond, within 100 RPM, with each command?		 Go to Intermittent Conditions Go to Step 3 
3 Inspect for any condition that can reduce idle speed by increasing engine load. Examples include:
  • Incorrect torque converter clutch (TCC) operation
  • Accessories that require additional torque to operate
  • Restricted exhaust
  • Mechanical conditions that limit engine speed

Did you complete the action?		 Go to Step 4  -
4
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?		 Go to Step 2  Go to Step 5 
5 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.