P0705

Diagnostic Chart:

Description:

Wiring Diagram:

CIRCUIT DESCRIPTION

The transmission range switch is a multi-signal switch which sends a signal to the PCM to indicate gear selection. The transmission range switch uses 4 discrete circuits to pull 4 PCM voltages low in various combinations to indicate each gear range. The voltage level of the circuits is represented as LO = grounded, HI = open circuit. The 4 states displayed represents the encoder P, A, B, and C inputs in sequence.

CONDITIONS FOR SETTING THE DTC

^ The PCM recognizes an invalid PRNDL parameter.

^ The vehicle speed is greater than 5 mph (8 km/h).

^ The above conditions met for a period longer than 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM will record operating conditions at the time during which the diagnostic fails. This information will store in the Failure Records buffer.

^ A history DTC stores.

CONDITIONS FOR CLEARING THE MIL/DTC

^ A history DTC will clear after 40 consecutive warm up cycles without a fault.

^ A scan tool can clear the MIL/DTC(s).

DIAGNOSTIC AIDS

^ Monitor a scan tool while moving the related connectors and the wiring harness. It a failure is induced, the scan data will change states from either LO to HI, or from HI to LO. Move the gear selector slowly through each gear while monitoring the scan tool in order to help isolate the problem.

^ Thoroughly check any suspected circuitry for the following conditions:

- Improper mating.

- Broken locks.

- Improperly formed or damaged terminals.

- Poor terminal to wiring connections.

- Physical damage to the wiring harness.

^ When a DTC P0705 sets, the PCM defaults to the 3rd gear until the PCM receives a correct combination. Therefore, some of the selected gear positions may not be possible until you repair the fault.

^ If the trans range switch on the scan tool and the PRNDL on the Instrument Panel Cluster (IPC) display a normal reading only in the following gear selections:

- Park, Low, and 2nd gear check for an open in the TR switch input B circuit.

- Reverse, Neutral, Overdrive and 3rd gear - check for a grounded TR switch input B circuit.

- Low, 2nd 3rd and Overdrive gear check for a grounded in the TR switch input C circuit.

- Park, Reverse, and Neutral - check for an open in the TR switch input C circuit.

- Park, Reverse, 2nd and 3rd gear - check for a grounded in the TR switch input A circuit.

- Neutral, Overdrive and Low gear - check for an open in the TR switch input A circuit.

- Park, Neutral, 3rd and Low gear - check for a grounded in the TR switch input P circuit.

- Reverse 2nd and Overdrive gear - check for an open in the TR switch input P circuit.

TEST DESCRIPTION

Number(s) below refer to the step number(s) on the Diagnostic Table.

1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.

4. Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.

5. An invalid circuit will cause the PRNDL display to go out. Jumpering each circuit to ground simulates the trans range switch operation and checks the circuitry and PCM. While the trans range switch is disconnected and the circuits are not jumpered to ground, the scan tool should indicate a HI value. A value that is indicated as LO with no jumper to ground indicates a grounded circuit or malfunctioning PCM.

9. The replacement PCM must be programmed and the crankshaft position system variation procedure must be preformed. Refer to the latest Techline procedure for PCM reprogramming and also refer to Crankshaft Position (CKP) System Variation Learn Procedure for the Crankshaft Position System Variation Procedure.

11. If no malfunctions have been found at this point and no additional DTCs were set, refer to Diagnostic Aids for additional checks and information.