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Probe / Harness - Tech Support

 

Inspecting Probes and Harness Leads

 

First you have to have the right tools for the P2 connector.

 

AMP P/N # 205089-1
Tyco AMP Crimping Tool P/N # 601966-1 Military Spec # M22520/2-01
K13-1 Positioner P/N # 601966-5 Military Spec # M225202/2-08
Insertion / Extraction Tool P/N 91067-2

 

 

Crimp

 

WARNING about installing probes

The minimum radius of bends in wire groups or bundles must not be less than 10 times the outside diameter of the largest wire or cable, except that at the terminal strips where wires break out at terminations or re-verse direction in a bundle. Where the wire is suitably supported, the radius may be 3 times the diameter of the wire or cable. Where it is not practical to install wiring or cables within the radius requirements, the bend should be en-closed in insulating tubing. The radius for thermocouple wire is 20 times the diameter.

 

 

 

Bend
Over bending voids warranty.

 

Bent Probe

 

The following tests are used to inspect the probes and harness leads. In most cases, the cause of missing EGT, TIT, or CHT readings can be attributed to a problem involving the probes or harness wiring.

  • Disconnect probe from harness wiring. Measure the resistance of the probe between the two leads. Correct reading should be less than a couple of ohms.
  • Measure the probe for correct grounding. Measure the resistance from one of the probe leads to the engine case. This reading should be less than 10 ohms.
  • If measurements above are good, remove the probe. Connect a meter across the two probe leads. Heat the probe using a torch or lighter. The resistance should always be less than a couple of ohms.
  • Inspect the wiring harness for breaks and good crimps. Pull tautly on the crimp. It should not separate from the wire. Ensure that the wire is not pinched or broken. The wiring harness should not be bundled with ignition leads, P-leads, alternator wiring, or battery wiring.
  • Inspect the pin connections at the instrument connector. Ensure that the pins make good contact with the circuit board. Tug on the wire. It should not pull free from the connector or pin.
  • Harness leads can be difficult to troubleshoot. In most cases, it is ideal to replace the possible problematic wire with a new one. Please note that probe wiring cannot be spliced.
  • Inspecting OAT Probe - PDF OAT Test

    OAT Probe

    How does the OAT probe operate

    The Insight 1200-021 OAT probe is not a resistance type. It is a semi-conductor, output current proportional to absolute temperature type. The probe has a sensitivity of one micro-amp (1 uA) per Kelvin, and requires a minimum of four Volts (4V) to operate. For example at 0 Celsius (273 K) the probe draws 273 micro-Amps.

 

 

Location of Vibration Sensor

 

Vibration Sensor

 

Vibration Sensor

 

Vibration Sensor

 

 

 

 

 

 

 

 

  
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