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 (MLP & SIG RTN).
• Faulty PCM.
  Fig 1: Manual Lever Position (MLP) Sensor Schematic (TD1)

  
  Fig 2: MLP Circuit & Connector Terminal ID (TD2)

  
  MLP 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. Code P0705, P0707 & P0708
   
   Probable causes for these codes are as follows:
   • Code P0705; MLP not in Park during KOEO self-test.
   • Code P0707; MLP sensor shorted to ground.
   • Code P0708; MLP circuit open or shorted to power.

   Turn ignition off. Ensure parking brake is applied. Place MLP in Neutral. Place MLP Sensor Gauge (T92P-7010-AH) in MLP sensor adjustment slot and go to next step. If gauge does fit in slot, loosen MLP 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. Using scan tester, access MLP and MLPV PIDs. Turn ignition on. Cycle gear shift lever through all gear ranges while monitoring voltage. See MLP SENSOR SPECIFICATIONS  table. If voltage is not within specification, go to next step. If voltage is within specification, go to step 5).
3. Check Continuity Of MLP Circuits
   
   Turn ignition off. Disconnect MLP sensor wiring harness connector. Disconnect PCM 104-pin connector. Inspect terminals for damage and repair if necessary. Install EEC-V Breakout Box (014-00959), leaving PCM disconnected. Measure resistance between test pin No. 64 (MLP) at breakout box and MLP terminal of MLP sensor wiring harness connector. Measure resistance between test pin No. 91 (SIG RTN) at breakout box and SIG RTN terminal of MLP 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.
4. Leave ignition off and MLP sensor disconnected. Measure resistance between test pin No. 64 (MLP) 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.
5. Check MLP Sensor Resistance
   
   Leave ignition off. Reconnect MLP 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 the MLP SENSOR SPECIFICATIONS  table. If each resistance measurement is within specification, replace PCM and repeat QUICK TEST. If any resistance measurement is not within specification, replace MLP sensor and repeat QUICK TEST.