Automatic Transmission - Diagnosis - E4OD A/t: Overview Ford Econoline E350

DESCRIPTION & OPERATION

Input signals from sensors are sent to the Powertrain Control Module (PCM). The PCM can determine when the time and conditions are right for a shift or converter clutch application. The PCM can also determine line pressure needed to optimize shift feel.

The PCM controls transmission operation through 5 electronic solenoids consisting of 4 On/Off solenoids for shifting and torque converter clutch control and one variable force solenoid for line pressure control. All components are part of the transmission solenoid body and are not serviceable individually. The PCM has built-in self-diagnostic capability, fail-safe code and warning code display for the main input sensors and solenoid valves.

Note. In addition to transmission trouble codes, engine related trouble codes may be output during QUICK TEST procedure. These codes pertain to engine performance and must be repaired first, as engine performance will greatly affect transmission operation. For information and testing procedures of engine related fault codes and components, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section.

Engine Identification (ID) Codes

Engine ID codes are issued at beginning of KOER SELF-TEST. Codes are one-digit numbers represented by number of pulses displayed. (Схема №5) Engine ID code is equal to one-half the number of engine cylinders. For example, 2 pulses would indicate that engine is a 4 cylinder. ID code is used to verify proper PCM is installed and that SELF-TEST has been entered.

EEC-IV DTC IDENTIFICATION

Note. In addition to transmission fault codes, engine-related fault codes may be output during QUICK TEST procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section.

EEC-IV DTC IDENTIFICATION

Description

Following procedures are functional tests of EEC-IV system. The following 4 basic test steps must be carefully followed in sequence, otherwise misdiagnosis or replacement of non-faulty components may result

1. VISUAL CHECK
2. EQUIPMENT HOOKUP.
3. KOEO (Key On Engine Off) Self-Test.
4. KOER (Key On Engine Running) Self-Test.

Hardware Limited Operational Strategy (HLOS)

If a number of system or sensor failures are present and PCM is not receiving enough information to operate, PCM will switch to HLOS mode. PCM will output fixed values to allow operation of vehicle. Driveability concerns will be present. PCM will not output service codes in this mode.

EEC-V DTC IDENTIFICATION

Note. For transmission fault codes perform appropriate circuit or pinpoint test. See EEC-V DTC IDENTIFICATION TABLE. For engine-related fault codes output during QUICK TEST procedure, see appropriate TESTS W/CODES article in ENGINE PERFORMANCE section. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation.

EEC-V DTC IDENTIFICATION

Following procedures are functional tests of EEC-V system. These basic test steps must be followed in sequence to avoid misdiagnosis

1. Visual Check
2. Equipment Hookup
3. KOEO (Key On Engine Off) Self-Test
4. KOER (Key On Engine Running) Self-Test
5. Computed Timing Check
6. Continuous Memory Self-Test

After each service or repair procedure has been completed, repeat QUICK TEST to ensure all EEC-V systems work properly and diagnostic trouble codes are no longer present.

Generic OBD-II Parameter Identification (PID)

Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select vehicle and engine selection menu (optional).
2. Select year, engine, model and any additional information requested by scan tool (optional).
3. Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
4. Select PID/DATA MONITOR.
5. Turn ignition on or start engine and allow to idle.
6. Follow operating instructions from scan tool menu.
7. Select PIDs and press START.

Non-Generic OBD-II Parameter Identification (PID)

Turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select vehicle and engine selection menu.
2. Select year, engine, model and any additional information requested by scan tool.
3. Select GENERIC OBD-II OPTIONS. Press CONT button if monitors are not complete.
4. Select DIAGNOSTIC DATA LINK.
5. Select PCM - POWERTRAIN CTRL MODULE.
6. Select DIAGNOSTIC TEST MODES.
7. Select PID DATA MONITOR AND RECORD.
8. Turn ignition on or start engine and allow to idle.
9. Follow operating instructions from scan tool menu.
10. Select PIDs and press START.

On-Board System Readiness (OSR) Test Mode

All OBD-II scan tools must display OSR test. The OSR will display monitors on the vehicle and status of all monitors; complete or not complete. If not complete, the scan tool will display which monitor has not completed.

To enter OSR, turn ignition switch to OFF position. Ensure test equipment is properly attached. Program scan tool using the following steps

1. Select vehicle and engine selection menu (optional).
2. Select year, engine, model and any additional information requested by scan tool.
3. Follow operating instructions from scan tool menu.
4. Select GENERIC OBD-II FUNCTIONS. Press TEST button if all OBD-II monitors are not complete.
5. Start engine and allow to idle.
6. Select ON-BOARD SYSTEM READINESS.