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OBD-344 On-Board Diagnostics _____________________________________________ Action Taken When the DTC Sets • The TCM Illuminates the malfunction indicator lamp (MIL). • When in a forward range and shifting is completed, the transmission will fail to another forward range, unless the trans- mission is compromised by over speeding or direction change, then the transmission will shift to NEUTRAL. • When in a forward range and the shift is in process, the transmission will return to a previous range, except for 1-2 shifts and 2-1 shifts where the shifts will be completed. • When in NEUTRAL or REVERSE, the transmission will fail to NEUTRAL. • While diagnostic response is active, the shift selector is moved from a forward range to NEUTRAL or from a forward range to REVERSE, then the transmission will shift to NEUTRAL. • DTC P0846 will be stored in TCM history. • The TCM freezes shift adapts. • The TCM inhibits torque converter clutch (TCC) engagement. Conditions for Clearing the DTC A scan tool can clear the code from TCM history. The TCM automatically clears the DTC from TCM history if the vehicle com- Diagnostic Aids • Inspect the wiring for poor electrical connections at the TCM. Inspect 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. • You may have to drive the vehicle in order to experience a condition. • This DTC may indicate D solenoid is mechanically defective. • When a P0846 and P0848 are set in combination, this may indicate an open circuit condition is present at the pressure switch circuit or the shift valve is stuck in the unstroked position Step Action Value(s) Yes No 1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2 Go to Diagnostic System Check 2 Measure the transmission fluid level. Refer to Transmission Fluid Is the transmission fluid level correct? Go to Step 3 Go to Transmission Fluid Checking Procedure 3 Measure the line pressure. Is the pressure within the specified value? Go to Step 4 Go to Symptoms Automatic Transmission |