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P0404-EGR POSITION SENSOR PERFORMANCE (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The EGR valve has a position sensor and the EGR position rationality is designed to make sure that the valve • When Monitored: • Set Condition: Possible Causes EXCESSIVE RESISTANCE IN THE (F856) 5-VOLT SUPPLY CIRCUIT (K35) EGR SOLENOID CONTROL CIRCUIT (K34) EGR SENSOR SIGNAL CIRCUIT OPEN (K34) EGR SENSOR SIGNAL CIRCUIT SHORTED TO GROUND (K900) SENSOR GROUND CIRCUIT OPEN EGR SOLENOID ASSEMBLY PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read DTCs. Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. EGR POSITION VOLTAGE NOTE: Diagnose all other EGR DTC(s) before continuing. With a scan tool, read the EGR Position Sensor voltage. Choose a conclusion that best matches the EGR voltage reading. Below 3.5 volts Go To 3 Between 3.5 volts to 4.3 volts Go To 5 Above 4.3 volts Go To 6 9 - 456 ENGINE ELECTRICAL DIAGNOSTICS WK |