Engine Controls - Diagnostic Methods - 6.0L Diesel: Overview Ford Econoline E150

Overview

The Diagnostic Methods article provides detailed instructions on how to access or perform routine diagnostic tasks. This article can be referenced as many times as needed for step-by-step instructions for routine procedures.

Quick Test Description

Quick Test is divided into five specialized tests

1. Retrieve/Clear Continuous DTCs
2. Key On Engine Off (KOEO) On-Demand Self-Test
3. Key On Engine Off (KOEO) Injector Electrical Self-Test (Click Test)
4. Key On Engine Running (KOER) On-Demand Self-Test
5. Key On Engine Running (KOER) Glow Plug Monitoring Self-Test

All are described below.

Quick Test checks the integrity and function of the Powertrain Control system and outputs the test results upon demand. Quick Test also provides a quick end check of the powertrain control system and is usually performed at the start of each diagnostic procedure. It is also performed at the end of most pinpoint tests for verification of repair and to make sure no other faults were incurred while servicing a previous fault.

Quick Test Operation

Quick Test is performed by retrieving KOEO, KOER, and Continuous Memory DTCs (CMDTCs).

For all concerns, refer to SYMPTOM CHARTS - 6.0L DIESEL . Quick Test is performed by retrieving KOEO, KOER and Continuous Memory DTCs. If a DTC is retrieved, you must then go to the appropriate Pinpoint Test. If unable to complete a self-test, GO to PINPOINT TEST AE: UNABLE TO ACTIVATE SELF TEST COMMUNICATION ERROR/DTC NOT LISTED .

Parameter Identification (PID)

The Parameter Identification (PID) mode allows access to certain data values, analog and digital inputs and outputs, calculated values, and system status information. Throughout the manual, there will be references to PID values. PID Data Monitor and Record can be accessed from the scan tool through the Diagnostic Data Link menu.

Selecting Parameter Identification (PID)

Connect the scan tool to the DLC under the dash. Turn off accessories. If the vehicle is equipped with an auxiliary powertrain control (RPM control), it must be turned off to perform self-tests.

1. Perform the necessary vehicle preparation and visual inspection. Refer to «QUICK TEST OPERATION»(ref-225538-S40905568902006031800000)
2. Refer to the manufacturer manual for scan tool instructions.
3. Follow operating instructions from the menu.
4. Select the PIDs, press START to begin monitoring.

Parameter Identification (PID) List

PARAMETER IDENTIFICATION (PID) LIST

Description

All OBD scan tools should display the On-Board System Readiness (OSR) Test. The OSR will display the supported monitors on the vehicle, the status of all monitors (complete or not complete) and the MIL status. If a monitor is not complete, the scan tool will not identify the monitor that has not completed. Readiness for the 6.0L is reported based on the completeness of the comprehensive component monitors (CCM) and the misfire monitor and the EGR monitor. These monitors must be complete before readiness can be cleared. It is not possible to determine which individual monitors are complete/incomplete.

Freeze Frame Data allows access to emission related values from specific generic PIDs. These values are stored the instant an emission related DTC is stored in Continuous Memory. This provides a snapshot of the conditions that were present when the DTC was stored. Once one set of freeze frame data is stored, this data will remain in memory even if another emission related DTC is stored. When a DTC associated with the freeze frame is erased or a PCM memory reset is performed, new freeze frame data can be stored again. In the event of multiple emission related DTCs in memory, always note the DTC for the freeze frame data.

The Powertrain Control Module (PCM) Reset allows the scan tool to command the PCM to clear all emission-related diagnostic information. When resetting the PCM, a DTC P1000 will be stored in the PCM until all the OBD system monitors or components have been tested to satisfy a drive cycle, without any other faults occurring. For more information about a drive cycle, refer to DRIVE CYCLES . Clearing DTCs from the vehicle-specific RETRIEVE/CLEAR CONTINUOUS MEMORY DTCs will clear all systems, including the OBD systems. Clearing DTCs from the OBD generic menu will only clear OBD features for the 6.0L diesel.

The following events occur when a PCM reset is performed

1. Clears the number of Diagnostic Trouble Codes (DTC).
2. Clears the DTCs.
3. Clears the freeze frame data.
4. Resets status of the OBD system monitors.
5. Sets DTC P1000 as a vehicle-specific DTC. P1000 will not appear as an OBD DTC.

The primary intention of the OBD Drive Cycle is to clear the DTC P1000 and to satisfy the specifications for SAE specification J1979. Each OBD monitor must run during the drive cycle.

If the drive cycle is completed and P1000 is not cleared, repeat the entire drive cycle. If a particular step is interrupted, simply repeat the drive mode. If the drive cycle is interrupted with a key-off, only drive modes that were incomplete must be run.

Rough road conditions may prevent certain steady state conditions and steady accelerations from validating the transmission- and load-related monitors.

Vehicles equipped with Power Take-Off (PTO) must have that system disengaged before the OBD drive cycle is initiated.

Basic circuit checks help to minimize pinpoint test steps by providing a procedure to diagnose harness faults associated with the Electronic Engine Control (EEC) System. The following techniques provide helpful reminders for diagnosing open circuits (continuity), shorts to ground and shorts to power.

Note. The suspect circuit must be isolated before testing. When disconnecting any harness connector, always inspect for damaged or pushed-out pins, corrosion and loose wires. Repair as necessary. The digital multimeter must be set to the correct scale. The techniques do no apply in all situations; therefore, it is necessary to perform each pinpoint test step accurately and completely. General resistance and voltage values are specified below. Always use the pinpoint test values if they differ. Always turn the key to the OFF position unless directed otherwise by the pinpoint test.

Each of the following procedures will require the powertrain control module (PCM) and component to be disconnected to isolate the harness.

See also:
• SYMPTOM CHARTS - 6.0L DIESEL