Diagnostic Aids

WARNING: This page is about a different car, the 1995 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

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 (TR and SIG RTN).
Faulty Powertrain Control Module (PCM).

Fig 1: Transmission Range (TR) Sensor Schematic (Ranger)

Fig 2: Identifying TR Test Circuit & Connector Terminals (Ranger)

TR SENSOR SPECIFICATIONS

Position	Volts	Ohms
Park	4.23-4.68	3770-4607
Reverse	3.52-3.89	1304-1593
Neutral	2.80-3.10	660-807
Overdrive	2.09-2.31	361-442
Drive	1.39-1.53	190-232
First	0.68-0.76	78-95

1) DTC P0707, P0708, P0736, P1701 & P1705

Probable causes for these codes are as follows:

Misadjusted linkage.
Misaligned TR sensor.
TR sensor open or shorted circuit.

Turn ignition off. Ensure parking brake is applied. Place TR in Neutral. Place TR Sensor Gauge (T92P-7010-AH) in TR sensor adjustment slot and go to next step. If gauge does not fit in slot, loosen TR sensor mounting screws and move sensor until gauge fits in slot. Tighten screws and verify shift linkage is properly adjusted. Repeat QUICK TEST .

2) Remove sensor adjustment gauge. Connect scan tester to DLC. Turn ignition on. Using scan tester, access TR PID and TR-M PID. Voltage reading should be stable. Place gear shift lever in Park position. Tap on TR sensor while monitoring PID voltage for fault. Fault will be indicated by change in PID voltage. Shake and bend sections of wiring harness between TR sensor and PCM. If no faults are indicated, go to next step. If faults are indicated, go to step 4).

3) Check TR Sensor Voltage

Turn ignition on. Using scan tester, access TR PID and TR-M PID. Voltage reading should be 4.23-4.68 volts in Park position. Cycle shift lever through complete gear range. Voltage should be within specification. See TR SENSOR SPECIFICATIONS table. If each voltage measurement is within specification, fault is internal transmission damage. If any voltage measurement is not within specification, go to next step.

4) Check Continuity Of TR Circuits

Turn ignition off. Disconnect scan tester. Disconnect TR sensor wiring harness connector. Disconnect PCM 104-pin connector. Inspect terminals for damage and repair if necessary. Install EEC-V Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 64 (TR) at breakout box and TR terminal of TR sensor wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of TR sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit and repeat QUICK TEST .

5) Leave ignition off and TR sensor disconnected. Measure resistance between test pin No. 64 (TR) and test pins No. 71, 76, 77, 91 and 97 at breakout box. Measure resistance between test pin No. 64 and chassis ground. If all resistance measurements are 10,000 ohms or more, go to next step. If any resistance measurement is less than 10,000 ohms, repair short circuit and repeat QUICK TEST .

6) Check TR Sensor Resistance

Leave ignition off. Reconnect TR sensor. Unlock steering column. Measure resistance between breakout box test pins No. 64 and 91 in each gear range. Resistance should be within specification. See TR SENSOR SPECIFICATIONS table. If each resistance measurement is within specification, fault is internal transmission damage. If any resistance measurement is not within specification, replace TR sensor and repeat QUICK TEST .