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Reduced Power Lamp (RPL) On Steady - Amigo & Rodeo

WARNING: This page is about a different car, the 2000 Isuzu VehiCROSS, 2000 Isuzu Trooper, 2000 Isuzu Rodeo, 2000 Isuzu Amigo, and 2000 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article. After performing OBD-II system check, go to next step.
  2. Turn ignition off. Disconnect Multiplex Control Unit (MCU). Turn ignition on. If RPL is on, go to next step. If RPL is off, go to step  4.
  3. Turn ignition off. Check for short to ground on RPL driver circuit between MCU and instrument cluster. Repair as necessary. If no problem was found, go to next step.
  4. Replace MCU. Turn ignition on. Use scan tool to select RPL DASH LAMP control and command RPL to turn off. Retest system. If no problems were found, go to step  7.
  5. Turn ignition off. Disconnect PCM harness connectors. Check for faulty lamp driver circuit between PCM and MCU. If problem was found, go to next step. If no problem was found, go to step  7.
  6. Locate and repair fault in lamp driver circuit between PCM and MCU. Go to next step.
  7. Use scan tool to select RPL DASH LAMP CONTROL. Command RPL to turn OFF. If RPL turned off, repairs are complete. If RPL did not turn off, go to next step.
  8. Turn ignition off. Disconnect PCM harness connectors. Check for faulty circuit between PCM and DLC. If problem was found, go to next step. If no problem was found, go to step  10.
  9. Locate and repair problem in circuit between PCM and DLC. Go back to step  7.
  10. Replace and reprogram PCM. See PROGRAMMING . Perform On-Board Diagnostic II (OBD-II) System Check. See ON-BOARD DIAGNOSTIC II (OBD-II) SYSTEM CHECK in SELF-DIAGNOSTICS - INTRODUCTION article.
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