DTC P0705 Trans Range Switch Circuit. Pontiac Grand Prix 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 DTC 🢒 DTC P0705 Trans Range Switch Circuit

Refer to

Cell 20: Automatic Tranaxle Range Switch, and IAC

Cell 20: Automatic Transaxle Solenoids, and TCC Switch
Cell 20: Engine Controls-Indicator Lamps
OBDII Symbol Description Notice
Handling Electrostatic Discharge Sensitive Parts Notice
Cell 14: Engine Ground G117
Cell 14: Engine Grounds G100, G111 and G113
Cell 14: Engine Grounds G100, G111 and G113
Handling Electrostatic Discharge Sensitive Parts Notice
Cell 138: 2 of 2

Circuit Description

The Transaxle Range Switch is part of the Transaxle Park/Neutral Position (PNP) switch mounted on the transaxle manual shaft. The four inputs from the transaxle range switch indicate to the PCM which position is selected by the Transaxle selector lever. This information is used for ignition timing, EVAP canister purge, EGR and IAC valve operation.

The combination of the four transaxle range input states determine the PCM commanded shift pattern. The input voltage level at the PCM is high (B+) when the transaxle range switch is open and low when the switch is closed to ground. The state of each input is represented on the scan tool as X=high voltage level, 0=low voltage level. The four parameters represent transaxle range switch Parity, A, B, and C inputs respectively.

Transaxle Range Switch Valid Input Combinations

Gear Selector Position	Scan Tool Trans Range PABC Display X=High 0=Low
Gear Selector Position	P	A	B	C
Park (P)	0	0	X	X
Reverse (R)	X	0	0	X
Neutral (N)	0	X	0	X
Drive4 (OD)	X	X	0	0
Drive3 (3)	0	0	0	0
Drive2 (2)	X	0	X	0
Drive 1 (1)	0	X	X	0

Conditions for Setting the DTC

The Transaxle Range Switch inputs indicate an invalid combination for longer than 10 seconds.

Action Taken When the DTC Sets

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC

•	The DTC becomes history when the conditions for setting the DTC are no longer present.

•	The history DTC clears after 40 malfunction free warm-up cycles.

•	The PCM receives a clear code command from the scan tool.

Diagnostic Aids

Important: : Vehicle should not be driven with transaxle range switch disconnected, as idle quality will be affected.

Check for the following conditions:

Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

•	Poor terminal connection.

Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Intermittents and Poor Connections Diagnosis , and Connector Repairs Wiring Systems.

•	Damaged harness.

Inspect the wiring harness for damage. If the harness appears to be OK, observe the sensor display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the sensor display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems.

•	Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Fail Records can be useful in determining when the DTC was last set.

Test Description

This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

DTC P0705 - Transaxle Range Switch Circuit

Step	Action	Value(s)	Yes	No
1	Was the Powertrain ON Board Diagnostic System Check performed?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Turn the ignition ON, engine OFF. Place the transaxle in Park. Observe the scan tool Trans. Range PABC display. Does scan tool Trans Range PABC display the specified values?	P=0 A=0 B=X C=X	Go to Step 3	Go to Step 4
3	Observe the scan tool Trans Range PABC display while selecting each gear position. Record Trans Range PABC statuses in each gear position. Compare the scan tool display with each gear position selected to the Transaxle Range Switch Valid Input Combinations table included on the Diagnostic Support page. Does the scan tool display match the Transaxle Range Switch Valid Input Combinations table in each gear position?	--	Go to Diagnostic Aids	Go to Step 10
4	Does scan tool Trans Range PABC display the specified values?	P=0 A=0 B=X C=X	Go to Step 5	Go to Step 7
5	Check the Transaxle Range switch 4-way connector for being disconnected. If a problem is found, repair as necessary. Was a problem found?	--	Go to Step 17	Go to Step 6
6	Check for an open in the ground circuit at the Transaxle Range switch 7 wire connector. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 17	Go to Step 13
7	Does scan tool Trans Range PABC display the specified values?	P=0 A=0 B=X C=X	Go to Step 8	Go to Step 10
8	Disconnect the Transaxle Range switch 4-wire connector. Observe the scan tool Trans Range PABC display. Does scan tool Trans Range PABC display the specified values?	P=0 A=0 B=X C=X	Go to Step 9	Go to Step 14
9	Turn the ignition. Check the Transaxle Range input wiring for being pinched or otherwise shorted to ground. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found	--	Go to Step 17	Go to Step 16
10	Compare the wires in the Transaxle Range switch 4-wire connector to the mechanization on the Diagnostic Support page to check for crossed wires. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 17	Go to Step 11
11	Turn the ignition off. Check for an open, short to ground, or short to voltage in the circuit which caused the incorrect transaxle range switch input combination. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 17	Go to Step 12
12	Reconnect the Transaxle Range switch. Connect a test light between battery positive voltage and the trans range circuit which caused the incorrect transaxle range switch input combination. Observe and record the state of the test light while selecting each gear position. Compare the test light state in each gear position with the Transaxle Range Switch Valid Input Combinations table. Is the test light ON when the input should equal 0 and OFF when the input should equal X?	--	Go to Step 15	Go to Step 13
13	Check for poor terminal connections at the Transaxle Range switch 4-way and 7-way connectors. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 17	Go to Step 14
14	Replace the Transaxle range switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle. Is the action complete?	--	Go to Step 17	--
15	Check for poor terminal connections at the PCM. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems. Was a problem found?	--	Go to Step 17	Go to Step 16
16	Important:: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete?	--	Go to Step 17	--
17	Clear DTCs. Observe the scan tool Trans Range PABC display while selecting each gear position. Record Trans Range PABC status in each gear position. Compare the scan tool display with each gear position selected to the Transaxle Range Switch Valid Input Combinations table included on the Diagnostic Support page. Does the scan tool display match the Transaxle Range Switch Valid Input Combinations table in each gear position?	--	System OK	Go to Step 2