Allison 3000 & 4000 Gen5 Fault Code P070C Transmission Fluid Level Sensor Circuit Low

Here is the instruction show you guide on how to solve Allison 3000 & 4000 Gen5 engine fault code P070C transmission fluid level sensor circuit low.

 

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DIAGNOSTIC RESPONSE:

None

CIRCUIT DESCRIPTION:

Most 3000/4000 transmission are equipped with an analog transmission fluid Oil Lever Sensor (OLS). This test detects if the OLS signal voltage is in the low error zone.

NOTE: The OLS is standard on any 3000 and 4000 Product Families 5th Generation Controls transmissions except for the 3700SPS and 4700/4800retarder models where it is unavailable.

The TCM is connected to the OLS by:

1 A 5V reference voltage(W112),

2 OLS signal (W116)

3 Analog ground (W158).

ACTION TAKEN WHEN THE DTC SETS:

When DTC P070C is active, the following conditions occur:

1 The TCM does not illuminate the CHECK TRANS light.

2 DTC is stored in TCM history.

3 Fluid level may not be checked with the OLS.

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 the TCM history if the vyehicle completes 40 warm-up cycles without failure

DIAGNOSTIC AIDS:

NOTE: The OLS may be damaged using a continuity tester or continuity check function using a DMM. Damage to the OLS occurs if 12V is applied to the OLS.

DTC P070C indicates the TCM has detected a voltage signal from the OLS in the low error zone. This may be caused by the following:

1 Open or short to ground in W112 or W116 circuits

NOTE: Shorts or opens in W112 typically will log other sensor failed low DTCs that are using W112 (5V), such as the analog TPS,Electronic Brake System(EBS) pressure sensor, or Retarder Modulation Request(RMR) sensor.

Shorts or opens in W116 (OLS signal) only causes DTC P070C.

2 Non-OLS application has been autodetected or programmed to ‘Present’ by the CMC ‘Override Oil Level Sensor’ as having an OLS when an OLS is not installed

3 Missing,defective, or unplugged OLS

4 Defective sensor sharing 5V supply with an OLS

5 5V wire open or grounded in transmission internal harness

6 TCM issue

7 Transmission low on fluid

OLS voltage (signal voltage on W116) is available on the diagnostic tool Data Monitor grid. Prior to ‘Connect’ for the diagnostic tool, check the ‘Troubleshoot Specific Problem’ box under the “Connection Options” and then check the ‘Sensor, Voltage, Ohms, and Counts Data’ box.

The J-39700 Universal Breakout Box may also be used to acquire OLS signal (sensor) voltage on W116.The data monitor values for ‘Oil Level Sensor Voltage’ and ‘Oil Level Deviation’ should be checked with the TCM initialized, engine running, and transmission in N (Neutral).Transmission fluid temperature must be over the minimum threshold before noting the ‘Oil Level Deviation’ amount. Both values are useful for troubleshooting OLS performance by:

1 If the sensor signal voltage does not meet requirements shown in “Conditions for Setting the DTC”

2 how the oil level deviation changes when a known quantity of oil is added or removed from the transmission

More Allison repair case,please refer to Allison Trouble Repair

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