TG90 - Perform Drive Cycle Test

- Run Key On Engine Off (KOEO) Self-Test and record all Continuous Memory Diagnostic Trouble Codes (DTC) displayed. Quick Test Appendix (Detailed Testing Instructions)

- Clear continuous memory. Clearing Diagnostic Trouble Codes

NOTE: Obey all traffic laws.

- Drive Cycle:

- Gear position in Drive range, press the Transmission Control Switch (TCS) (the Transmission Control Indicator Lamp (TCIL) should light) and moderately accelerate from stop to 40 mph. This will allow the transmission to shift into third gear. Hold speed and throttle opening steady for a minimum of 15 seconds (30 seconds for altitudes above 4000 feet).

- Press TCS (the TCIL should turn off) and accelerate from 40 mph to 50 mph. This will allow the transmission to shift into fourth gear. Hold speed and throttle steady for a minimum of 15 seconds.

- With transmission in fourth gear and maintaining steady speed and throttle opening, lightly apply and release brake (to operate stop lamps). Then hold speed and throttle steady for at least an additional five seconds.

- Brake to a stop and remain stopped for a minimum of 20 seconds with transmission in drive. Repeat drive cycle at least five times.

- Rerun Key On Engine Off (KOEO) Self-Test and record all Continuous Memory DTCs. Quick Test Appendix (Detailed Testing Instructions)

- Are pass codes present in Continuous Memory (any code 10-11/111)?

Yes -- Unable to duplicate fault at this time. For further diagnosis using EEC-IV Monitor Box or Scan Tool, refer to Normal Scan Data Values. If further diagnosis is not performed, then clear continuous memory and Refer to Diagnosis by Symptom (Diagnostic Routines) for possible internal transmission damage. Clearing Diagnostic Trouble Codes

No -- For DTCs 99/624, 651 or 67/634: Go to TG91. TG91 - Check For Intermittent Fault In Harness and Connectors

For DTCs 29/452 (for all other vehicles): Go to DP1. DP - Vehicle Speed Sensor (VSS)

For DTCs 659 667, 668 and 675: Go to TG93. TG93 - Check for DTC 659

For an other DTC: Go to TG92. TG92 - Enter Key On Engine Off Continuous Monitor Mode