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Home >> Honda >> 2000 >> CR-V SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls - Self-Diagnostics - 3.2L & 3.5L) >> Diagnostic Trouble Code Identification >> DTC P1509: Idle Control System High Rpm >> Diagnostic Procedure

Diagnostic Procedure

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 (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. After performing OBD system check, go to next step.
  2. Start and idle engine. Turn off all accessories. Using scan tool, select MISC TEST, then select IAC SYSTEM. Command engine speed up to 1500 RPM, down to 500 RPM, then back to 1500 RPM while monitoring ENGINE SPEED display. If ENGINE SPEED display remains within 50 RPM of desired value, for each RPM command, fault is not present, see DIAGNOSTIC AIDS . If engine speed is not within 50 RPM of desired value, go to next step.
  3. Disconnect IAC valve. Install IAC Noid-Light (J 37027). Start engine. Command engine speed up to 1500 RPM, down to 500 RPM, then back to 1500 RPM while monitoring noid-light. If noid-light cycles Red and Green (never off), go to step  5. If noid-light does not cycle, go to next step.
  4. Check all IAC circuits for open, short to ground or short to voltage. Repair as necessary. If circuits are okay, go to step  8.
  5. Check throttle body for objects blocking IAC passage or throttle bore, excessive deposits in IAC passage, pintle, throttle bore or throttle plate. Check for restriction or vacuum leaks in air intake system. Check adjustment screw for tampering. Repair as necessary. If no problems are found, go to next step.
  6. Check for poor terminal contact at IAC harness connector. Repair as necessary. If terminal contacts are okay, go to next step.
  7. Replace IAC valve. Retest system.
  8. Replace and reprogram PCM. See PROGRAMMING . Retest system.
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