DTC P0705 Trans Range Switch Circuit. Chevrolet Monte Carlo 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Monte Carlo 🢒 Engine 🢒 Engine Controls - 3.1L 🢒 DTC P0705 Trans Range Switch Circuit

Refer to

Cell 20: Engine Data Sensors-Transaxle Range Switch: PCM Inputs

Engine Controls Components
Powertrain Control Module Description
Handling ESD Sensitive Parts Notice
Cell 14: G111 and G113
Cell 20: Engine Data Sensors-Transaxle Range Switch: PCM, Backup Lamps and Theft Deterrent
Cell 20: Engine Data Sensors-Automatic Transaxle TCC Switch
OBD II Symbol Description Notice
schematic.

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 High, and Low. 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 will not illuminate the Malfunction Indicator Lamp (MIL).

•	The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC

•	A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

•	DTC can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Diagnostic Aids

Check for the following conditions:

•	Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. Refer to Intermittents and Poor Connections Diagnosis Repairing Connector Terminals and Connector Repairs .

•

Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the ECT display on the scan tool while moving connectors and wiring harnesses related to the Trans Range Switch. A change in the Trans Range display will indicate the location of the fault. Refer to Wiring Repairs .

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

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.

Step	Action	Value(s)	Yes	No
1	Was the Powertrain OBD System Check performed?	--	Go to Step 2	Go to Powertrain On Board Diagnostic (OBD) System Check
2	Turn the ignition on, and leave the 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 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?	--	Refer 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	Test the Transaxle Range switch 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	Test 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 . 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 off. Disconnect the PCM. Test 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 . 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 test for crossed wires. If a problem is found, repair as necessary. Refer to Wiring Repairs . Was a problem found?	--	Go to Step 17	Go to Step 11
11	Turn the ignition off. Disconnect the Transaxle Range switch and the PCM. Turn the ignition on. Test 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 . Was a problem found?	--	Go to Step 17	Go to Step 12
12	Reconnect the Transaxle Range switch. At the PCM connector, connect a J 35616-200 test lamp 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 J 35616-200 test lamp while selecting each gear position. Compare the test lamp state in each gear position with the Transaxle Range Switch Valid Input Combinations table. Is the J 35616-200 test lamp on when the input should equal 0 and off when the input should equal X?	--	Go to Step 15	Go to Step 13
13	Test 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 . 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 . Is the action complete?	--	Go to Step 17	--
15	Test for poor terminal connections at the PCM. If a problem is found, repair as necessary. Refer to Wiring Repairs . Was a problem found?	--	Go to Step 17	Go to Step 16
16	Replace the PCM. Important: : Replacement PCM must be programmed. 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