Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

• Wiring harness circuits (TCC).
• Faulty Powertrain Control Module (PCM).

1. 90) Perform Drive Cycle Test  Warm engine to normal operating temperature. Ensure transmission fluid level is correct. Shift transmission to drive "D". Press TCS on shifter handle. O/D OFF light should illuminate. Accelerate from stop to 40 mph. Hold speed for at least 15 seconds (30 seconds above 4000 ft.). Press TCS and accelerate to 50 mph. Hold speed for at least 15 seconds (30 seconds above 4000 ft.). Hold speed and throttle position steady for at least 15 seconds. While maintaining speed with transmission in 4th gear, lightly depress brake pedal and release (to operate stoplights). Hold speed for at least an additional 5 seconds. Bring vehicle to stop for at least 20 seconds with transmission in drive "D". Repeat drive cycle test at least 5 times. Perform Quick Test and record continuous memory codes. If continuous memory DTC 628 is present, go to next step. If no codes are present and driveability symptoms still exist, see PINPOINT TEST  C for further diagnosis of TCC solenoid.
   NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 90) to step 92). No test procedures have been omitted.
2. 92) Check Harness Circuits  Connect scan tool to DLC. Access KOEO continuous monitor mode. Perform wiggle test of PCM and TCC circuit harness and connectors. If no faults are indicated, go to TROUBLE SHOOTING in FORD 4R44E & 4R55E article. If fault is indicated, inspect and repair circuits or replace components as needed. Clear continuous memory and repeat QUICK TEST.