| Table 1: | Transmission Range Switch Valid Input Combinations |
| Table 2: | DTC P0705, P0706-Transaxle Range Switch Circuit |
Circuit Description
The transmission on this vehicle has a Park Neutral Position (PNP) and Back-up switch. This switch incorporates a transmission range selector switch. There are four inputs (PRND A, B, C, P) which are switches to ground. The four switches have an unique switch pattern. The PCM uses the combination of the switch patterns in order to determine the gear selected by the driver.
The PCM monitors the transmission range selector switch when the engine starts. If the PCM detects that the transmission is not in Park or Neutral when started, this DTC sets.
Conditions for Running the DTC
Ignition voltage is greater than 8.0 volts.
Conditions for Setting the DTC
| • | The PCM detects that transmission range selector switch indicates a range other than Park or Neutral when the vehicle starts. |
| • | The PCM will test for this condition once an ignition cycle. |
| • | The diagnostic fails two out of four tests. |
Action Taken When the DTC Sets
| • | The powertrain control module (PCM) stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | A last test failed (Current DTC) will clear when the diagnostic runs and does not fail. |
| • | Use a scan tool in order to clear the MIL/DTC. |
Diagnostic Aids
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
The following may cause an intermittent:
| • | Inspect for poor connections. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
| • | Corrosion |
| • | Mis-routed harness |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
| • | Manipulate related wiring and connectors while observing the PRND Range parameters (PRND A, B, C, P) on the scan tool. If the manipulation causes an intermittent, the corresponding parameter changes on the scan tool. |
| • | Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. |
| For an intermittent, refer to Symptoms . |
The table below is the normal state that each gear range should indicate. ON indicates the circuit is low (switched/shorted to a ground). OFF indicates the circuit is high (open). Another parameter to display is PRND Range. This parameter displays the current gear range the transmission is in. When there is an invalid gear range, the parameter indicates Invalid.
Gear Selector Position | Scan Tool Trans Range ABCP Display | |||
|---|---|---|---|---|
A | B | C | P | |
Park (P) | ON | OFF | OFF | ON |
Reverse (R) | ON | ON | OFF | OFF |
Neutral (N) | OFF | ON | OFF | ON |
Drive4 (OD) | OFF | ON | ON | OFF |
Drive3 (3) | ON | ON | ON | ON |
Drive2 (2) | ON | OFF | ON | OFF |
Drive 1 (1) | OFF | OFF | ON | ON |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This verifies whether a malfunction is present. If the PCM does not detect any invalid ranges, this indicates the fault is not present. You may have repaired the fault when the switch was adjusted.
-
Any circuit that you suspect is causing an intermittent condition, thoroughly inspect for the following:
-
A circuit malfunction causes the Trans Range to display an invalid range on the scan tool. Jumping each circuit to ground simulates the trans range switch operation and tests the circuitry and PCM. While the transmission range switch is disconnected and the circuits are not grounded, the scan tool should indicate OFF. A value that indicates ON with no jumper to ground indicates a grounded circuit or malfunctioning PCM.
-
If you have not found any malfunctions at this point and no additional DTCs were set, refer to Diagnostic Aids for additional information.
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal to wiring connections |
| • | Physical damage to the wiring harness |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
|
Important: Adjust the PNP switch and the shift cable/lever before proceeding with this diagnostic table. Refer to Park/Neutral Position Switch Adjustment (4L60E) or Park/Neutral Position Switch Adjustment (4L80E) in Transmission.
Does the scan tool indicate an invalid position in any of the gear ranges? | -- | Go to Diagnostic Aids | ||
3 | Compare the scan tool values with the Transmission Range Switch Valid Input Combinations table. Does the scan tool display all the circuits as OFF? | -- | ||
Did you find and correct the condition? | -- | |||
Does the scan tool change from OFF to ON when the circuit was jumped to ground? | -- | |||
6 | Test the affected circuit for an open or a short to ground and repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
7 |
Did you find and correct the condition? | -- | ||
8 |
Did you find and correct the condition? | -- | ||
9 | Replace the PNP/Back Up Switch. Refer to Park/Neutral Position Switch Replacement (4L60E) or Park/Neutral Position Switch Replacement (4L80E) in Transmission. Is the action complete? | -- | -- | |
10 |
Important:: Program the replacement PCM. Refer to Powertrain Control Module Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | |
Does the scan tool indicate that this diagnostic has ran and passed? | -- | |||
12 | Verify if any DTCs are set. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to applicable DTC table | System OK |
