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(P0400) EGR SYSTEM PERFORMANCE (CONTINUED) When Monitored and Set Condition • When Monitored: A constant engine speed between 900 and 1700 RPM and no other EGR or MAP sensor • Set Condition: The PCM commands the EGR valve to open. The MAP sensor value must drop by a minimum POSSIBLE CAUSES EGR SOLENOID CONTROL CIRCUIT OPEN EGR SOLENOID CONTROL CIRCUIT SHORT TO GROUND EGR SOLENOID CONTROL CIRCUIT SHORT TO VOLTAGE FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN EGR SOLENOID EGR VALVE POWERTRAIN CONTROL MODULE For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. PRE-DIAGNOSTIC CHECK OUT Note: Always perform diagnostics with a fully charged battery. Note: Check connectors — Clean/repair as necessary. Poor pin to Note: Check for applicable TSBs related to the problem. With the DRB III T , read PCM DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and Perform this procedure prior to symptom diagnosis. Continue Go To 2 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 417 |