DTC P0883 TCM Power Input Signal High
P0883 - TCM Input Signal
Circuit Description
The Transmission Control Module (TCM) receives power directly from the battery. Wires 110 and 170 supply direct battery power to pins 10 and 70 respectively at the TCM.
Conditions for Running the DTC
Engine has been running for more than 10 seconds and engine speed is greater than 450 rpm.
Conditions for Setting the DTC
DTC P0883 sets under the following conditions:
• 12V TCM—The TCM detects an ignition voltage greater than or equal to 16V for 6 out of 10 samples.
• 24V TCM—The TCM detects an ignition voltage greater than or equal to 32V for 6 out of 10 samples.
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| Figure 1.1 - DTC and General Information |
Actions Taken When the DTC Sets
When DTC P0883 is active, the following conditions occur:
• The CHECK TRANS light does not illuminate.
• DTC is stored in TCM history.
Conditions for Clearing the DTC/CHECK TRANS Light
Use the Allison DOC™ For PC–Service Tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.
Diagnostic Aids
• A defective vehicle charging system that is overcharging may cause this DTC.
• Intermittent faults may exist in vehicle components such as a poor connection at the battery posts. Such faults would cause this DTC to set and not remain active.
• Inspect the wiring for poor electrical connections at the TCM. Look for the following conditions:
→A bent terminal
→A backed-out terminal
→A damaged terminal
→Poor terminal tension
→A chafed wire
→A broken wire inside the insulation
• When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.
• DTC P0883 may set if an A41 or A42 TCM is installed in a 24V electrical system.
#Test Description
The numbers below refer to step numbers on the diagnostic table.
2. Tests for proper battery voltage.
→Install the Allison DOC™ For PC–Service Tool.
→Turn ON the ignition, leave Engine OFF.
→Record the failure records.
→Clear the DTC.
→Observe the battery voltage value on Allison DOC™ For PC–Service Tool (9–18V for 12V TCM, and 18–32V for 24V TCM). NOTE: This DTC sets when battery voltage drops below a predetermined level that is temperature dependent for a predetermined number of detections. Is the battery voltage below specified value?
3. Tests for an active DTC.
→Start the vehicle, if possible.
→If the DTC is not active, drive the vehicle. Attempt to duplicate the same operating conditions observed in the failure records. Did the DTC return?
4. Tests vehicle battery per OEM guidelines.
→Test the vehicle battery per OEM instructions. This should include a voltage test and a load test. Does test indicate the battery is good?
5. Tests vehicle charging system per OEM guidelines.
→Test the vehicle charging system per the OEM recommended testing procedure. Is the charging system operating properly?
#To verify the repair:
→Clear the DTC.
→Start the Engine and warm to normal operating temperature. Did the DTC return?
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