Appendix
How to use Quick TestQuick Test is the procedure to activate the 4EAT Electronic Control Module Self-Test.
The Self-Test is divided into three specialized tests:
1. Key On Engine Off Test.
2. Continuous Test.
3. Switch Monitor Test.
The Processor stores the Self-Test program in its permanent memory. When activated, it checks the 4EAT Control System by testing its memory integrity and processing capability, and verifies that various sensors and actuators are connected and operating properly.
Key On Engine Off Test
A system to display service codes which are present or past failures. Service codes are indicated on the Self-Test Automatic Readout (STAR) Tester or Volt Ohm Meter (VOM). The Manual Shift Light will flash when a failure occurs. Use the Quick Test Step 3.0B and 4.0C - Service Code Charts to find the Diagnostic Chart-Pinpoint Test corresponding to the code(s).
Continuous Memory Codes
Continuous memory codes are issued as a result of information stored during the Continuous Test, while the vehicle was in normal operation. These codes are displayed during testing, and should be used for diagnosis only when a Continuous code results from Quick Test Steps 1.0 through 3.0.
Switch Monitor Test
A check of the 4EAT Control Module inputs using the 4EAT Tester. If a switch fails, proceed to Diagnostic Charts-Pinpoint Test PPM. If a PASS code is received, this is an indication that the 4EAT Control Systems are OK, proceed to Diagnostic Charts-Operational Tests for further evaluation.
Diagnostic Aids
Continuous Monitor Test (Wiggle Test)
This test is intended as an aid in diagnosing intermittent failures in the sensor input and output circuits.
Connect a STAR Tester or VOM to the Check Connector Output, per Quick Test Step 2.0.
Engine Running Continuous Monitor Test (Wiggle Test)
The Continuous Monitor (Wiggle) Test will allow the Technician to enter this mode of Self-Test and to attempt to re-create the intermittent failure. It is necessary to drive the vehicle each time the suspect harness and/or sensor is tapped, moved, or wiggled.
If the Manual Shift Light indicates a fault (short or open) the corresponding service code will be indicated. Now with the knowledge of the affected circuits, a close check of the harness and associated connectors can be made.
NOTE: Remember to keep your eyes on the Manual Shift Light for any change which will indicate where the intermittent is located.
Example: How to Use the Continuous Monitor Test (Systematically)
If a service code 06 was displayed (Vehicle Speed Sensor):
1. Erase Memory.
2. Visually inspect the sensor very closely.
3. Enter Continuous Monitor Test.
4. Lightly Tap on the sensor.
5. PUSH/PULL on the sensor harness connector (do not disconnect, yet).
6. Test and WIGGLE (SHAKE) harness vigorously, working from the sensor connector toward the dash panel, and from the dash panel to the Processor in short sections. DRIVE the vehicle each time the harness is WIGGLED.
7. If STAR Tester or VOM has not given a positive indication of an intermittent, disconnect the sensor from the harness as carefully as possible. Remove terminals from the connector. Visually inspect terminals at both ends for corrosion, bad crimps, improperly seated terminals, etc..
8. Reconnect after inspection.
9. Disconnect Processor from harness as carefully as possible.
10. Inspect terminals.
11. Only remove terminals associated with the sensor being inspected.
12. If the STAR Tester or VOM does not give a positive intermittent indication, reconnect the connector and ERASE the Continuous Test service codes. Proceed to Diagnostic Charts-Operational Tests.
13. To ERASE the Continuous Memory service codes:
a. Turn ignition switch off.
b. Disconnect the small (16-pin) connector on the 4EAT Control Unit.
c. Remove the STAR Tester or VOM.
d. Re-run Self Test to verify service codes have been erased.
Code Output Format-Service Codes
The 4EAT Manual Shift Light system communicates service information by flashing under normal driving conditions.
The service codes are transmitted on the Check Connector Output Line. They will be represented as a pulsing or sweeping movement of the voltmeter's needle across the dial face of the voltmeter. Therefore, a two-digit number of sixty-three will be reported by six (1.2 second) pulses (sweeps), with a 1.6 second pause, followed by three (0.5 second) pulses (sweeps). There is a 0.4 second pause between each pulse, and a 4.0 second delay after the service code is indicated until the beginning of the next service code.