EEC-V Graphs and Charts
EEC-V Graphs and ChartsStatic Resistance Values Chart:
Temperature Sensor Graphs And Transformation Tables:
Glow Plug Lamp Cycles On/Glow Plugs Recycle/Engine Stumble/Die/No Accelerator Pedal Authority Until Return to Idle Position
A powertrain control module (PCM) reset occurs when the PCM momentarily "reboots" or is turned off and on while the engine is operating. If the condition occurs a single time, the engine will momentarily stumble and the PCM will go through a normal key on cycle, including turning the glow plug lamp and glow plugs on and will also attempt to validate the accelerator pedal position. If the pedal is not at the idle position when this fault occurs, pedal authority will not be allowed by the PCM until the accelerator pedal is released and the engine returns to idle.
Probable Causes
^ Momentary loss of power to the PCM or IDM: Defective power relays, shorted or open harness, intermittent connectors, poor grounds.
^ Momentary short to ground of VRef: Shorted harness or connector, defective sensor (sensors that use VRef include - EBP Exhaust Back Pressure, ICP Injection Control Pressure, CMP Camshaft Position Sensor, MAP Manifold Absolute Pressure Sensor, BARO Barometric Pressure Sensor, AP Accelerator Pedal sensor).
^ Momentary short to ground of injector high side voltage: Under valve cover harness, valve cover gasket, engine harness, chassis harness are all possible sources of short to ground conditions.
Procedures
NOTE: If the PCM is unable to perform a KOEO injector electrical self test (buzz test) it may indicate an injector circuit high side short to ground condition. Disconnect pairs of injectors by removing the connector at the valve cover and attempt to perform the buzz test. If the buzz test can be accomplished with an injector pair disconnected, the high side short to ground has most likely been isolated to the under valve cover harness corresponding to the disconnected injectors.
^ Check all power and ground connections for the PCM and IDM.
^ Monitor VRef (pin No.90) and V Power (pins No.71 and No.97) with the breakout box installed.
^ Inspect the CMP sensor harness connector and the harness (particularly around the idler pulley) for a VRef or signal short to ground condition.
^ Remove and inspect the CMP camshaft position sensor for possible timing disk to CMP sensor contact.
^ If the PCM reset condition is repeatable, disconnect the following sensors one at a time and operate the engine to determine if the reset will reoccur. (EBP Exhaust Back Pressure, ICP injection control pressure, MAP manifold absolute pressure sensor, AP accelerator pedal sensor.) Inspect each harness, including the connector upon removal.
^ Remove the valve covers and inspect the under valve cover connectors for possible pinching under the valve cover gasket or rub through against the push tubes.