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DTC P0403: EGR Solenoid Circuit: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If Good Trip counter is displayed for DTC P0403 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P0403 or displayed count is not "0", go to step  8.
  2. Turn ignition off. Disconnect EGR solenoid connector. Turn ignition of. Ensure all accessories are off. Using a test light connected to positive battery voltage, probe Dark Blue/Violet wire at EGR solenoid wiring harness. Using scan tool, actuate EGR solenoid and observe test light. If test light does not flash, disconnect test light and go to next step. If test light flashes, inspect EGR solenoid backpressure hose and tube for obstructions and damage. Repair or replace backpressure hose and tube as necessary. If backpressure hose and tube are okay, replace EGR solenoid.
  3. Using a test light connected to ground, probe Pink/Gray wire at EGR solenoid harness connector. If test light illuminates, go to next step. If test light does not illuminate, repair open in power circuit to EGR solenoid. See WIRING DIAGRAMS article.
  4. Measure voltage between ground and Dark Blue/Violet wire at EGR solenoid harness connector. If voltage is less than one volt, go to next step. If voltage is one volt or more, repair short to voltage in Dark Blue/Violet wire.
  5. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, near front of battery. Measure resistance between ground and Dark Blue/Violet wire at EGR solenoid harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Violet wire between PCM and EGR solenoid.
  6. Measure resistance of Dark Blue/Violet wire between EGR solenoid harness connector and terminal No. 40 at PCM C1 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Violet wire.
  7. At this time, PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  8. Check exhaust system for leaks. Repair exhaust as necessary and retest. If no exhaust leaks are found, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor parameters related to DTC while wiggling connectors and wiring harness. If value changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused value to change. If value does not change, review Freeze Frame data using scan tool. Attempt to duplicate condition that caused DTC to set. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, test is complete.
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