Diagnostic Aids

Perform this test only when directed by QUICK TEST. To prevent replacing good components, be aware the following non-EEC areas may be at fault:

• Transmission linkage and internal components.
• Electrical (alternator, battery, add-on devices, etc.).

This test is not intended to diagnose transmission. This test is intended to diagnose:

• Wiring harness circuits (TR and SIG RTN).
• Powertrain Control Module (PCM).

Fig 1: TR Sensor Connector Terminal ID (AODE & 4R70W Shown; E4OD Similar)

1) Codes 522, 634 & 654  KOEO Codes 522, 634 and 654 indicate TR sensor is out of self-test range (3770-4607 ohms) when gear selector is in Park. Possible causes for these faults are:

• Linkage not adjusted correctly.
• Faulty TR sensor.
• Circuit open or grounded.
• Faulty Powertrain Control Module (PCM).

Turn ignition off. Apply parking brake. Place transmission gear selector in Neutral. Place TR Sensor Gauge (T92P-70010-AH) in sensor slot. If gauge does not fit, loosen TR sensor mounting bolts and adjust sensor as necessary. If gauge fits, remove gauge and go to next step.

2) Check TR Sensor Circuit Continuity  Turn ignition off. Disconnect TR sensor wiring harness connector. Disconnect 60-pin PCM connector. Inspect terminals and repair if damaged. Install EEC-IV Breakout Box (T83L-50-EEC-IV), leaving PCM disconnected. Measure resistance between TR terminal at TR sensor wiring harness connector and test pin No. 30 at breakout box. Also measure resistance between SIG RTN terminal at TR sensor wiring harness connector and test pin No. 46 at breakout box. If either resistance is more than 5 ohms, repair open circuit and repeat QUICK TEST. If each resistance is 5 ohms or less, go to next step.

3) Check TR Sensor For Short To Power & Ground  Turn ignition off. Leave PCM and TR sensor disconnected. Measure resistance between test pin No. 30 and test pins No. 37, 40, 46, 57 and 60 at break-out box. Also measure resistance between test pin No. 30 and chassis ground. If any resistance is less than 10,000 ohms, repair short circuit and repeat QUICK TEST. If each resistance is 10,000 ohms or more, go to next step.

4) Check TR Sensor Resistance  Turn ignition off. Connect TR sensor. Leave PCM disconnected. Unlock steering column. Measure resistance between test pins No. 30 and 46 at breakout box while cycling gear selector. See TR SENSOR RESISTANCE table. If resistance is within specification, replace PCM and repeat QUICK TEST. If resistance is not within specification, replace TR sensor and repeat QUICK TEST.