| 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 4 inputs (PRND A, B, C, P) which are switches to ground. The 4 switches have an unique switch pattern. The powertrain control module (PCM) uses the combination of the switch patterns in order to determine the gear selected by the driver.
This diagnostic monitors the 4 inputs in order to determine what gear position the transmission is in. When the PCM detects that an illegal range has occurred, this DTC sets.
Conditions for Running the DTC
Ignition voltage is more than 8 volts.
Conditions for Setting the DTC
| • | The transmission range select lever switch indicates an illegal position. |
| • | The PCM detects an illegal range for 10 seconds. |
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 DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids
Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing or replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent water intrusion into the PCM.
The following may cause an intermittent:
| • | Poor connections--Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
| • | Corrosion |
| • | Misrouted 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 Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid in determining how many ignition cycles the diagnostic reported a pass or a fail. Operate the vehicle within the same freeze frame conditions, such as 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 or shorted to a ground. OFF indicates the circuit is high or 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.
-
Inspects for proper connections.
-
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 a 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.
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 and lever before proceeding with this diagnostic table. Refer to Park/Neutral Position Switch Adjustment (4L60-E) or Park/Neutral Position Switch Adjustment (4L80-E) in Automatic 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 and back-up Switch. Refer to Park/Neutral Position Switch Replacement (4L60-E) or Park/Neutral Position Switch Replacement (4L80-E) in Automatic Transmission. Is the action complete? | -- | -- | |
10 |
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement . 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 the applicable DTC table | System OK |
