This instruction show you guide on how to repair Allison 3000 & 4000 Gen5 fault code P0708 transmission range sensor circuit high.
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DIAGNOSTIC RESPONSE:
Ignore defective strip selector inputs
CIRCUIT DESCRIPTION:
This test monitors whether the transmission range data from the analog strip shift selector is valid.
ACTION TAKEN WHEN THE DTC SETS:
When the DTC P0708 is active, the following conditions occur:
1 The DTC is stored in the TCM history.
2 The TCM illuminates the CHECK TRANS light.
3 The TCM ignores input from the analog strip shift selector.
4 Locks in N (Neutral).
CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from theTCM history if the vehicle completes 40 warm-up cycles without the DTC recurring.
DIAGNOSTIC AIDS:
This DTC may be caused by:
1 Short to power or short to another wire in W114,W138,W153, or W173.
2 High resistance or open in W114, W138,W153, or W173.
3 Poor yehicle grounds.
4 Unlocked connectors, expanded terminals, poor pin crimps or unlocked pins causing high resistance or open circuit.
5 Unlocked connectors, unlocked pins, causing shorts in connectors.
6 TCM ground is at different voltage potential than the ground of the OEM voltage source responsible for strip shift selector.
7 Defective TCM.
8 Defective strip shift selector.
More Allison repair case,please refer to Allison Trouble Repair