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OBD-352 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 which 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 P0848 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 that D solenoid is mechanically defective. • When a P0848 and P0846 are set in combination, this may indicate an open circuit is present at the pressure switch circuit or the shift valve is stuck in the unstroked position. • This DTC can be caused by a loss of prime. 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 |